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Copyright 2008 Carrier Corporation Form 50BYN-3PD
The 50BYN single-package cooling units with integral air-cooled
condens-ers offer:• Compact, durable, and attractive
cabinet fits any working environment• Ducted or free return with
rear return
connections with vertical or horizontal front supply air
discharge
• High-efficiency cooling for commercial and industrial
projects
• Rear condenser inlet and discharge and belt drive condenser
fan permit condenser air connections to be ducted through window or
wall louver
Features/BenefitsThe Omnizone 50BYN units provide a practical
and economical approach to comfort conditioning requirements for
offices, factories, and other applications in existing buildings
when indoor air-cooled condensers are required.Design
flexibilityThe 50BYN indoor packaged units are designed to provide
the flexibility re-quired in replacement, renovation, and new
construction. Units are available in 6 sizes from 5 tons to 20 tons
which meet the needs for cooling restaurants, retail stores,
warehouses, offices, and building additions.
OMNIZONE™50BYN006-024
Air-CooledIndoor Self-Contained
Systems5 to 20 Nominal Tons
ProductData
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The compact footprint and service from the front of the units
save valu-able floor space in equipment rooms. Belt drive
condensers provide adequate static to overcome ducting and louver
static losses. This allows units to be po-sitioned against an
existing window or wall louver, or ducted to the outside, as
required. These units can be installed in the equipment room or the
condi-tioned space and used for either ducted or free return
applications. Convenient rear connections allow easy access for
outside air connections and air side economizer. Unit supply air
discharge may be vertical or horizontal front to make the best use
of headroom.
Easy installation andmaintenanceThe units are completely
pre-piped and wired at the factory to ensure time and money saving
installation and ser-vice. Exterior access panels are easily
removed to provide speedy inspection, and service work may be done
from the front of the unit. Precision engi-neered parts translate
to a quality built, reliable design that will operate effi-ciently,
minimize service calls, and pro-vide years of reliable
operation.
Designed for customersatisfactionWhere space and styling are
important considerations, 50BYN units are de-signed to exceed
expectations. The high quality baked enamel finish will fit any
environment attractively. These packaged systems provide the user
with economy and product satisfaction in cooling, heating (with
accessory heating coil), dehumidification, filter-ing, and air
circulation.
All units are designed to fit through most standard doors. Unit
size 024 may be easily field split to simplify moving the units
into existing buildings.
Special features for outstand-ing performance• High-efficiency
scroll compressors
deliver quiet, reliable cooling capac-ity. Compressor motor
protection is assured by quick-acting, internal sensing elements
that prevent trou-ble before it starts.
• Space-saver slab type evaporator and condenser coils use
advanced heat transfer technology and pro-vide peak heat transfer
efficiency with large coil face area. Fins are mechanically bonded
to nonfer-rous, seamless tubing for efficient leak-free
operation.
• Quiet fan performance moves large volumes of indoor air.
Compact housing and specially designed dis-charge air section
provide superior air handling capacity.
• Convenient front access electrical control center contains all
factory pre-wired control devices.
• A specially designed sloped con-densate pan prevents water
from accumulating in the basepan, meet-ing the ASHRAE 62 (American
Society of Heating, Refrigeration and Air Conditioning Engineers)
indoor-air quality standards to pro-vide a comfortable and safe
occu-pied space. As a result of this new design, the coil is easily
accessed for cleaning.
• The interior of the evaporator sec-tion is lined with a heavy
gage alu-minum liner, providing cleanable surfaces for optimum
indoor air quality.
• The cabinets are constructed of gal-vanized steel, bonderized,
and coated on all external surfaces with a baked enamel finish. The
paint finish is nonchalking and is capable of withstanding ASTM
(American Society for Testing and Materials) Standard No. B117
500-hour salt spray test.
• A choice of controls provides the flexibility to meet almost
any appli-cation. Choose between a full line of room-mounted
thermostats, or the TEMP system thermostat which provides for
communicating control or interface to VVT® (variable vol-ume and
temperature) systems.
• Full compressor protection is assured by several devices,
including Cycle-LOC™ current-sensing lock-out relay(s), Time Guard
II anti-short cycle control, and high and low- pressurestats. These
devices lock out the compressor(s) under abnor-mal operating
conditions to prevent compressor damage and ensure long life.
• The 50BYN units are fully warran-tied as shipped from the
factory, including 1 year on all parts (com-pressor included).
Additional 2 to 5 year warranty on the compressor is standard on
unit sizes 006 to 016, and is available as an option on unit size
024.
• Easy to understand and operate controls provide a virtually
mistake-proof control operation.
• Two-stage capacity control (unit sizes 012 to 024) provides
back-up protection, additional operating effi-ciency, and energy
savings.
• Unit sizes 012 to 016 have 2 com-pressors, each on independent
refrigerant circuits. This provides backup protection and better
part load operating efficiency.
Features/Benefits (cont)
Table of contentsPage
Features/Benefits . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . 1-3Model Number Nomenclature
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3ARI Capacity Ratings . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . 3Physical Data . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . 4Field-Installed Accessories . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . 5Base Unit Dimensions . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . 6-8Accessory Dimensions . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . 9Selection Procedure . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . 10Performance Data . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . 11-17Electrical Data . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . 18Typical Wiring Schematic . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . 19-21Controls . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . 22Typical Piping and Wiring . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . 23Application Data . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . 24-28Guide Specifications . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . 29,30
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The 024 unit size uses 3 compres-sors, each on its own
independent refrigerant circuit. Standard control wiring from the
factory has 2 com-pressors on the first stage and one compressor on
the second stage. This can be easily changed at the jobsite to put
2 compressors on the second stage or even provide 3 steps of
control, for optimum part load operation.
• All motors are protected againstsingle-phasing conditions.
• Units are built in an ISO 9001:2000 (International Standards
Organization) certified manufactur-ing facility, and are fully
run-tested.
• Evaporator fan section on the unit size 024 is easily
removable to aid in rigging unit into existing buildings. Fan
discharge on all sizes (except unit size 014) can be quickly
con-verted from vertical to horizontal front supply.
• Dual condensate drain locations provide a choice when
installing the unit. The installer can use whichever drain best
suits the particular appli-cation, saving both installation time
and expense. A built-in secondary drain provides protection against
a plugged primary drain or rain entering the condenser, and may
eliminate the need to provide an additional drain pan at the
jobsite.
ARI* capacity ratings
LEGEND
*ARI — Air Conditioning and Refrigeration Institute.†SEER
applies to unit size 006 only.
NOTE: Unit is tested in accordance with ARI standard
360-2004.
UNIT50BYN
NOMINALTONS
EVAPORATORCFM
CONDENSERCFM
NET COOLING(Btuh)
TOTALkW
EER/SEER† IPLV
006 5 2,000 3,000 59,000 6.6 10.0† —008 71/2 3,000 4,500 81,000
9.1 8.9 8.3012 10 4,000 6,000 121,000 14.2 8.5 7.5014 12 4,800
7,200 137,000 16.1 8.5 7.5016 15 6,000 9,000 162,000 19.0 8.5
7.5024 20 8,000 12,000 224,000 26.3 8.5 7.5
EER — Energy Efficiency RatioIPLV — Integrated Part Load
Value
SEER — Seasonal Energy Efficiency Ratio
Y
50BYN Omnizone™ Indoor Self-Contained Air-Cooled Unit
Model number nomenclature
A50-8289.eps
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*Unit size 024 is factory wired for 2 stages of capacity
control. With the addition ofa 3-stage thermostat or outdoor-air
thermostat, the unit is capable of 3 stages ofcapacity control.
†Shaft center distances shown are for vertical discharge
arrangement.**Shaft center distances shown are for horizontal
discharge arrangement.
UNIT 50BYN 006 008 012 014 016 024NOMINAL CAPACITY (tons) 5 71/2
10 12 15 20UNIT OPERATING WEIGHT (lb) 594 765 950 1036 1190
1654COMPRESSOR Carrier Scroll
Model SR58 SR75 SR58 SR58/SR75 SR75 SR75Quantity 1 1 2 1/1 2
3Rpm 3500Oil Charge (oz) 44 50 44/44 50/44 50/50 50/50/50Steps of
Control 1 1 2 2 2 2*
OPERATING CHARGE R-22 (lb) 8.2 10.1 8.2/8.4 10.4/9.3 14.25/15.75
10.8/10.8/11.0EVAPORATOR FAN Adjustable, Belt-Driven,
Centrifugal
Nominal Cfm 2000 3000 4000 4800 6000 8000Cfm Range 1,500-2,500
2,250-3,750 3,000-5,000 3,750-6,000 4,500-7,500
6,000-10,000Available Static (in. wg) 1.2 1.25 2.25 2.25 2.0 2.0Fan
Size (in.) 101/2 x 71/2 11 x 8 121/2 x 91/2 14 x 12 121/2 x 91/2
121/2 x 91/2Number of Fans 1 1 1 2 2 2Standard Speed Range (Rpm)
1099-1506 1005-1378 845-1066 845-1066 1045-1306 809-1072Max
Allowable Rpm 1680 1500 1475 1400 1500 1333Motor Rpm 1750Vertical
Belt Quantity...Type 1...A33 1...A34 1...B41 1...B45 2...A42
2...B52Horizontal Belt Quantity...Type 1...A28 1...A29 1...B39 None
2...A32 2...B40Fan Pulley (in.) 4.3 4.7 8.7 8.7 6.7 8.0Motor Pulley
(in.) 2.7-3.7 2.7-3.7 4.2-5.3 4.2-5.3 4.0-5.0 3.7-4.9Nominal
Hp...Frame Size 11/2...145T 2...145T 3...182T 5...184T 5...184T
71/2...213TFan Shaft Size (mm) 20 20 20 25.4 25 25Motor Shaft Size
(in.) 7/8 7/8 7/8 11/8 11/8 13/8Center Distance (in.) min/max†
13.6-13.8 13.2-13.4 10.4-11.9 9.6-10.6 12.2-13.7 17.6-18.7Center
Distance (in.) min/max** 6.9-7.7 6.4-7.4 N/A N/A 7-8 10.6-11.4
EVAPORATOR COIL 3/8-in. OD, Enhanced Copper Tube, Aluminum
FinsQuantity Rows - Fins/in. 4...14 4...14 4...14 4...14 4...14
4...15Face Area (sq ft) 5.8 7.0 9.5 10.8 12.4 17.6
RETURN AIR FILTERS 1 in. Disposable TypeQuantity...Size 1...16 x
25
1...20 x 251...25 x 251...20 x 25
3...20 x 25 3...20 x 25 2...25 x 251...20 x 25
8...16 x 20
CONDENSER FAN Adjustable, Belt-Driven, CentrifugalNominal Cfm
3000 4500 6000 7200 9000 12,000Cfm Range 2,250-3,750 3,375-5,625
4,500-7,500 5,400-9,000 6,760-11,250 9,000-15,000Available Static
(in. wg) 1.0 1.0 1.0 1.0 1.0 1.0Fan Size (in.) 11 x 11 121/2 x
121/2 11 x 11 11 x 11 121/2 x 121/2 14 x 14Number of Fans 1 1 2 2 2
2Standard Speed Range (Rpm) 997-1364 845-1066 1045-1306 1045-1306
909-1136 841-1114Max Allowable Rpm 1364 1475 1475 1475 1500
1360Motor Rpm 1750Belt Quantity...Type 1...A65 1...B68 2...A67
2...A67 2...A78 2...B85Fan Pulley (in.) 4.7 8.7 6.7 6.7 7.7
8.0Motor Pulley (in.) 2.7-3.7 4.2-5.3 4.0-5.0 4.0-5.0 4.0-5.0
3.7-4.9Nominal Hp...Frame Size 2...145T 3...182T 5...184T 5...184T
5...184T 71/2...213TFan Shaft Size (mm) 20 20 25 25 25 25Motor
Shaft Size (in.) 7/8 7/8 11/8 11/8 11/8 13/8Center Distance (in.)
min/max 26.7-27.4 23.1-24.2 24.7-26.2 25.0-26.2 28.9-30.5
34.5-35.9
CONDENSER COIL 3/8-in. OD, Enhanced Copper Tube, Aluminum
FinsQuantity Rows...Fins/in. 4...14 4...14 5...14 5...14 5...14
5...15Face Area (sq ft) 6.4 7.7 10.5 11.8 14.2 19.4
CONTROLS 24 Volts Provided in UnitHigh Pressure Cutout (psig)
395 ± 10
Cut-in. (psig) 298 ± 20Low Pressure Cutout (psig) 27 ± 4
Cut-in. (psig) 67 ± 7Fusible Plug 203 FTime Guard II Devices 5
Minutes on Each Circuit
CONDENSATE DRAIN LINE 3/4 in. FPT PVC Connection
Physical data
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Filters — The unit can accept 2 in. thick cleanable or
dis-posable filters.Heating coils — Field-installed heating coils
for hot wateror steam have convenient field piping connections on
sideof unit. Coil mounts in front of cooling coil and uses
unitreturn-air filter track.Thermostats — A complete line of
thermostats is avail-able to meet any control requirements,
including TEMPSystem thermostats for diagnostics and
communicatingcapability.Low ambient damper — Refrigerant pressure
operateddamper mounted on condenser air discharge modulates
tocontrol head pressure. The damper permits unit to operatein
cooling even in winter, when outdoor-air temperature is
low. Damper automatically restricts condenser airflow tomaintain
correct condensing pressure for efficient opera-tion at
temperatures down to 0° F.Winter start kit — This package provides
a time delayfor the low-pressure switch.Defrost thermostat kit —
This package allows the unitcompressor to turn off when frost
begins to form on theevaporator coil.Discharge plenum — This kit is
for use in free blowapplications for controlled free blow into the
conditionedspace.
Field-installed accessories
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Base unit dimensions 50BYN006-012
DIM50BYN006 50BYN008 50BYN012
mm ft-in. mm ft-in. mm ft-in.A 1800 5-105/8 1800 5-105/8 1780
5-10B 1040 3- 5 1231 4- 01/2 1613 5- 31/2C 690 2- 31/8 690 2- 31/8
745 2- 53/8D 765 2- 61/8 765 2- 61/8 825 2- 81/2E 355 1- 2 420 1-
41/2 608 2- 0F 170 0- 63/4 158 0- 61/4 191 0- 71/2G 320 1- 05/8 357
1- 2 402 1- 37/8H 310 1- 01/4 350 1- 13/4 372 1- 25/8J 593 1-113/8
593 1-113/8 665 2- 21/4K 554 1- 97/8 554 1- 97/8 457 1- 6L 584 1-11
584 1-11 584 1-11M 23 0- 07/8 23 0- 07/8 23 0- 07/8N 17 0- 05/8 17
0- 05/8 17 0- 05/8P 11.5 0- 01/2 11.5 0- 01/2 11.5 0- 01/2Q 43 0-
13/4 43 0- 13/4 43 0- 13/4R 605 1-113/4 605 1-113/4 605 1-113/4S 50
0- 2 55 0- 21/8 55 0- 21/8T 360 1- 21/8 400 1- 33/4 357 1- 2V 50 0-
2 20 0- 07/8 24 0- 1W 660 2- 2 660 2- 2 660 2- 2X 535 1- 91/8 535
1- 91/8 590 1-111/4Y 190 0- 71/2 190 0- 71/2 190 0- 71/2Z 124 0-
47/8 124 0- 47/8 124 0- 47/8
AA 475 1- 63/4 475 1- 63/4 475 1- 63/4AB 140 0- 51/2 140 0- 51/2
140 0- 51/2AC 60 0- 23/8 60 0- 23/8 60 0- 23/8AD 21 0- 07/8 21 0-
07/8 21 0- 07/8AE 225 0- 87/8 225 0- 87/8 217 0- 81/2AF 155 0- 61/8
155 0- 61/8 155 0- 61/8AG 190 0- 71/2 190 0- 71/2 190 0- 71/2AH 73
0- 27/8 61 0- 23/8 59 0- 23/8AJ 895 2-111/4 1110 3- 93/4 1495
4-107/8AK 386 1- 31/4 405 1- 4 260 0-105/8AL 433 1- 5 480 1- 67/8
433 1- 5AM — — — — 275 0-107/8AN — — — — 433 1- 5AP 80 0- 31/8 80
0- 31/8 80 0- 31/8AQ 880 2-105/8 1070 3- 61/8 1455 4- 91/4AR 41 0-
15/8 41 0- 15/8 41 0- 15/8AS 533 1- 9 605 1-117/8 807 2- 73/4AT 347
1- 15/8 355 1- 2 375 1- 23/4AV 50 0- 2 50 0- 2 50 0- 2AW 231 0-
91/8 231 0- 91/8 169 0- 61/2
NOTES:1. Dimensions in [ ] are in millimeters.
2. Center of gravity.
3. Direction of airflow.
4. One side of unit must have minimum of 3 ft [914] clearance
for filter removal.
CORNER WEIGHTS
CORNER50BYN006 50BYN008 50BYN012kg lb kg lb kg lb
A 65.3 144 84 185 107 236B 68.5 151 81 179 107 236C 69.4 153 89
136 108 239D 65.8 145 92 203 108 239
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Base unit dimensions 50BYN014,016
DIM50BYN014 50BYN016
mm ft-in. mm ft-in.
A 1780 5-10 1980 6- 6
B 1804 5-11 1905 6- 3C 745 2- 53/8 745 2- 53/8D 825 2- 81/2 825
2- 81/2E 417 1- 41/2 543 1- 93/8F 246 0- 95/8 257 0-101/8G 345 1-
11/2 356 1- 2
H 321 1- 05/8 353 1- 17/8J 665 2- 21/4 665 2- 21/4K 457 1- 6 635
2- 1L 584 1-11 597 1-111/2M 23 0- 07/8 19 0- 03/4N 17 0- 05/8 17 0-
05/8P 11.5 0- 01/2 17 0- 05/8Q 43 0- 13/4 43 0- 13/4R 605 1-113/4
607 1-117/8S 55 0- 21/8 84 0- 33/8T 357 1- 2 402 1- 37/8V 24 0- 1
22 0- 07/8W 660 2- 2 765 2- 61/8X 590 1-111/4 603 1-113/4Y 190 0-
71/2 190 0- 71/2Z 124 0- 47/8 124 0- 47/8
AA 475 1- 63/4 432 1- 5
AB 140 0- 51/2 83 0- 31/4AC 60 0- 23/8 60 0- 23/8AD 21 0- 07/8
21 0- 07/8AE 217 0- 81/2 217 0- 81/2AF 155 0- 61/8 141 0- 51/2AG
190 0- 71/2 190 0- 71/2AH 59 0- 23/8 86 0- 33/8AJ 1686 5- 63/8 1737
5- 83/8AK 356 1- 2 318 1- 01/2AL 433 1- 5 483 1- 7AM 275 0-107/8
311 1- 01/4AN 433 1- 5 483 1- 7AP 80 0- 31/8 70 0- 23/4AQ 1645 5-
43/4 1765 5- 91/2AR 41 0- 15/8 41 0- 15/8AS 920 3- 01/4 979 3-
21/2AT 395 1- 31/2 385 1- 31/8AV 243 0- 91/2 276 0-107/8AW 169 0-
61/2 169 0- 61/2AX 50 0- 2 50 0- 2
CORNER WEIGHTS
CORNER50BYN014 50BYN016kg lb kg lb
A 108 238 119 263B 113 248 142 312C 127 280 152 334D 119 263 128
281
NOTES:1. Dimensions in [ ] are in millimeters.
2. Center of gravity.
3. Direction of airflow.
4. One side of unit must have minimum of 3 ft [914] clearance
for filter removal.
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Base unit dimensions 50BYN024
CORNER WEIGHTS
CORNER50BYN024
kg lbA 183 403B 194 428C 192 424D 181 400
NOTES:1. Dimensions in [ ] are in millimeters.
2. Center of gravity.
3. Direction of airflow.
4. One side of unit must have minimum of 3 ft [914] clearance
for filter removal.
DIM50BYN024
mm ft-in.A 2341 7- 81/4B 2108 6-11C 794 2- 71/4D 872 2-103/8E
581 1-107/8F 184 0- 71/4G 406 1- 4H 379 1- 3J 830 2- 85/8K 796 2-
71/4L 584 1-11M 28 0- 11/8N 40 0- 15/8P 51 0- 2Q 43 0- 13/4R 805 2-
73/4S 65 0- 21/2T 457 1- 6V 16 0- 05/8W 921 3- 01/4X 610 2- 0Y 202
0- 8Z 86 0- 33/8
AA 422 1- 45/8AB 140 0- 51/2AC 60 0- 23/8AD 21 0- 07/8AE 226 0-
87/8AF 184 0- 71/4AG 220 0- 83/4AH 62 0- 21/2AJ 1984 6- 61/8AK 345
1- 15/8AL 530 1- 87/8AM 356 1- 2AN 530 1- 87/8AP 76 0- 3AQ 1956 6-
5AR 41 0- 15/8AS 1085 3- 63/4AT 399 1- 33/4AV 314 1- 03/8AW 236 0-
91/4AX 50 0- 2AY 1471 4-10
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Accessory dimensions
DIMENSIONAL CHART
DIM50BYN006 50BYN008 50BYN012 50BYN014 50BYN0016 50BYN024
mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in. mm ft-in.A 287
0-115/16 366 1- 23/8 366 1- 23/8 366 1- 23/8 560 1-101/16 560
1-101/16B 1068 3- 711/16 1301 4- 31/4 1446 4- 815/16 1541 5- 011/16
2014 6- 65/16 2014 6- 65/16C 151 0- 515/16 189 0- 77/16 232 0- 91/8
286 0-111/4 286 0-111/4 286 0-111/4
HOT WATER COILD 242 0- 91/2 242 0- 91/2 242 0- 91/2 242 0- 91/2
242 0- 91/2 242 0- 91/2E 133 0- 51/4 133 0- 51/4 133 0- 51/4 133 0-
51/4 133 0- 51/4 133 0- 51/4F 73 0- 27/8 64 0- 21/2 83 0- 31/4 83
0- 31/4 162 0- 63/8 95 0- 33/4G 635 2- 1 597 1-111/2 597 1-111/2
597 1-111/2 584 1-11 762 2- 6
H 76 0- 3 83 0- 31/4 83 0- 31/4 83 0- 31/4 89 0- 31/2 89 0-
31/2J (return) 32 0- 11/4 38 0- 11/2 38 0- 11/2 38 0- 11/2 51 0- 2
64 0- 21/2K (supply) 32 0- 11/4 38 0- 11/2 38 0- 11/2 38 0- 11/2 51
0- 2 64 0- 21/2
L 32 0- 11/4 32 0- 11/4 32 0- 11/4 32 0- 11/4 32 0- 11/4 32 0-
11/4STEAM COIL
D 203 0- 8 203 0- 8 203 0- 8 203 0- 8 203 0- 8 203 0- 8E 64 0-
21/2 64 0- 21/2 64 0- 21/2 64 0- 21/2 64 0- 21/2 64 0- 21/2F 378 1-
27/8 362 1- 21/4 381 1- 3 381 1- 3 454 1- 57/8 454 1- 57/8G 314 1-
03/8 314 1- 03/8 314 1- 03/8 314 1- 03/8 314 1- 03/8 314 1- 03/8H
89 0- 31/2 89 0- 31/2 89 0- 31/2 89 0- 31/2 89 0- 31/2 89 0-
31/2
J (supply) 32 0- 11/4 38 0- 11/2 38 0- 11/2 38 0- 11/2 38 0-
11/2 51 0- 2K (return) 25 0- 1 25 0- 1 25 0- 1 25 0- 1 25 0- 1 38
0- 11/2
L 64 0- 21/2 64 0- 21/2 64 0- 21/2 64 0- 21/2 64 0- 21/2 64 0-
21/2
HEATING COIL
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I Determine design conditions.Given:Cooling RequirementsTotal
Cooling Capacity (TC) . . . . . . . . .87,000 BtuhSensible Cooling
Capacity (SHC) . . . . .70,000 BtuhEvaporator Air Quantity. . . . .
. . . . . . . . 3,000 CfmSummer Entering-Air Conditions:
Entering dry bulb (edb) . . . . . . . . . . . . . . . . .82
FEntering wet bulb (ewb) . . . . . . . . . . . . . . . .67
FEntering Condenser Air Temp (EAT) . . . . . . .95 F
Unit Voltage . . . . . . . . . . . . . . . . . . . . . . . . 460
VHeating RequirementsTotal Heating Load (TC) . . . . . . . . .
.200,000 BtuhWinter Entering-Air Temp (edb) . . . . . . . . . . .
.50 FEntering Hot Water Temp (ewt) . . . . . . . . . . .200 FFan
RequirementsExternal Static Pressure RequiredESP (in. wg) . . . . .
. . . . . . . . . . . . . . . . . . . . .0.75
II Select unit based on cooling requirements.Enter Gross Cooling
Capacities table for unit at3000 cfm and required wet bulb of 67 F
and readdown to the section displaying capacities with 95
Fentering-air temperature. The 50BYN008 provides atotal capacity
closest to design requirements.For example:Unit selection —
50BYN008
Selected at 3000 cfm of 82 F edb, 67 F ewb enter-ing air.TC =
88,800 BtuhCorrected SHC = 66,100 Btuh + (1.45 x 3000 cfm)
= 70,456 Btuh(See correction factor table, below the
coolingcapacity tables.)Compressor — Power Input = 5.08 kWLeaving
Air db82 F - (70,456/[1.1 x 3000 cfm]) = 60.6 F
Leaving Air wb at 67 F wb = 31.6231.62 - (88,800 Btuh/[4.5 x
3000 cfm]) = 25.06wb at 25.06 = 56.9 F
III Determine heating capacity.Enter Accessory Heating Coil
Capacities table,page 14, with selected air cfm. Select the
desiredwater temperature drop and read data, then correctas
indicated in heating correction tables.200 F hot water
selection:
TC = 211,000 Btuh selected at 3000 cfmcorrection factor at 50 F
entering air is 1.08, thenTC is 227,000 Btuh — this will exceed the
jobrequirements.Heating leaving air temperature
50 F + (227,000 Btuh/[1.1 x 3000 cfm]) = 118.8 FHeating gpm
227,000 Btuh/(20 F x 500) = 22.7 gpmIV Fan requirements.
External static pressure (ESP) required 0.75 in. wgStatic
pressure loss through heating coil 0.08 in. wgTotal external static
required 0.83 in. wgEnter Evaporator Fan Performance table for cfm,
andstatic pressure required to obtain the following data:
For 3000 cfm and 0.83 ESP, by interpolation thefan operates at
1224 rpm and requires 1.34 brakehorsepower.
Since standard motor horsepower is 2.0, it will pro-duce the
necessary cfm and ESP for this job.
Selection procedure (50BYN008 unit example)
-
11
GROSS COOLING CAPACITIES
LEGEND
Shaded area in table indicates nominal cfm values.
NOTES:1. Direct interpolation is permissible. Do not
extrapolate.2. Gross capacities do not include deduction of
indoor-fan motor heat.3. All capacities are based on nominal
condenser airflow.4. SHC is based on 80 F db temperature of air
entering the coil.
Below 80 F edb, subtract (corr factor x cfm) from SHC.Above 80 F
edb, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
5. The following formulas may also be used:
tlwb = Wet-bulb temperature corresponding to enthalpy of air
leaving evaporator coil (h)
Where: h = enthalpy of air entering evaporator coil.
50BYN006 (5 TON)
CondenserAir
Air Entering Evaporator — Cfm/BF1500/0.16 2000/0.30
2500/0.40
Air Entering Evaporator — Wet Bulb Temperature — Ewb (F)Cfm Temp
72 67 62 57 72 67 62 57 72 67 62 57
3000
75TC 71.2 65.4 59.9 56.1 74.9 68.7 63.3 61.7 77.3 70.9 65.9
65.7SHC 33.1 41.1 48.8 54.0 37.0 47.2 57.0 59.7 40.7 53.1 63.5
63.7kW 3.36 3.30 3.23 3.19 3.41 3.34 3.28 3.26 3.45 3.37 3.31
3.31
85TC 68.9 63.1 57.9 54.6 72.4 66.4 60.8 59.9 74.5 68.4 63.7
63.6SHC 32.2 40.1 47.9 52.5 36.1 46.3 55.8 57.9 39.7 52.1 61.6
61.5kW 3.71 3.63 3.57 3.53 3.76 3.68 3.60 3.60 3.80 3.71 3.65
3.64
95TC 66.0 60.9 55.6 52.9 69.6 63.8 58.7 58.0 71.6 65.7 61.7
61.6SHC 31.3 39.2 46.8 50.9 35.2 45.4 54.7 66.0 38.7 51.1 59.6
59.6kW 4.10 4.01 3.93 3.89 4.15 4.06 3.98 3.97 4.18 4.09 4.03
4.03
105TC 63.9 58.5 53.4 51.2 66.9 61.2 56.4 56.0 68.4 63.0 59.5
59.5SHC 30.3 38.2 45.9 49.2 34.2 44.3 53.4 54.0 37.6 50.0 57.4
57.5kW 4.51 4.42 4.33 4.30 4.57 4.47 4.39 4.38 4.59 4.52 4.45
4.45
115TC 60.9 56.0 51.2 49.4 63.6 58.3 54.0 53.9 65.2 59.7 57.1
57.1SHC 29.0 37.2 44.8 47.4 33.0 43.2 51.8 51.9 36.6 48.7 55.1
55.0kW 4.95 4.87 4.77 4.74 5.00 4.90 4.83 4.83 5.03 4.93 4.89
4.88
50BYN008 (71/2 TON)
CondenserAir
Air Entering Evaporator — Cfm/BF2250/0.19 3000/0.34
3750/0.43
Air Entering Evaporator — Wet Bulb Temperature — Ewb (F)Cfm Temp
72 67 62 57 72 67 62 57 72 67 62 57
4500
75TC 99.8 91.5 83.7 80.5 104.0 95.9 88.0 88.2 107.0 98.6 93.4
93.5SHC 46.7 59.0 71.1 76.6 53.0 69.0 83.1 84.3 58.8 78.1 89.5
89.6kW 4.12 4.03 3.93 3.89 4.19 4.10 3.99 4.00 4.23 4.13 4.06
4.06
85TC 96.7 88.4 80.3 78.3 101.1 92.3 85.6 85.6 104.0 94.8 90.7
90.7SHC 45.7 57.7 69.8 74.4 51.6 67.4 81.7 81.7 57.4 76.8 86.8
86.8kW 4.63 4.50 4.39 4.35 4.69 4.57 4.47 4.47 4.73 4.61 4.55
4.55
95TC 93.1 85.1 77.8 75.9 97.1 88.8 82.9 82.9 99.0 91.1 87.6
87.8SHC 44.3 56.4 68.4 72.0 50.4 66.1 79.0 79.0 56.0 75.3 83.7
83.9kW 5.15 5.01 4.89 4.86 5.21 5.08 4.98 4.98 5.26 5.13 5.07
5.07
105TC 89.4 81.8 74.9 73.6 93.1 85.1 80.1 80.0 95.3 87.1 84.7
84.6SHC 43.0 55.1 67.1 69.7 48.9 64.8 76.2 76.1 54.6 73.8 80.8
80.7kW 5.70 5.55 5.42 5.39 5.78 5.63 5.53 5.53 5.82 5.67 5.62
5.62
115TC 85.8 78.3 71.7 71.0 88.9 81.4 77.2 77.2 91.0 83.4 81.5
81.4SHC 41.7 53.8 65.5 67.1 47.6 63.4 73.3 73.3 53.4 72.5 77.6
77.5kW 6.29 6.13 5.98 5.96 6.38 6.20 6.12 6.12 6.41 6.26 6.22
6.22
BF — Bypass FactorEwb — Entering Wet-BulbkW — Compressor Motor
Power Input (kilowatts)SHC — Sensible Heat Cap. (1000 Btuh)TC —
Total Cap. (1000 Btuh) Gross
BYPASSFACTOR
(BF)
ENTERING AIR DRY-BULB TEMP (F)79 78 77 76 75 under 7581 82 83 84
85 over 85
Correction Factor.05 1.045 2.09 3.14 4.18 5.23
Use formulashown below.
.10 .98 1.98 2.97 3.96 4.95
.20 .88 1.76 2.64 3.52 4.40
.30 .77 1.54 2.31 3.08 3.85
.35 .72 1.43 2.15 2.86 3.58
tldb = tedb –sensible capacity (Btuh)
1.10 x cfm
hldb = hedb –total capacity (Btuh)
4.5 x cfm
Performance data
-
12
GROSS COOLING CAPACITIES (cont)
LEGEND
Shaded area in table indicates nominal cfm values.
NOTES:1. Direct interpolation is permissible. Do not
extrapolate.2. Gross capacities do not include deduction of
indoor-fan motor heat.3. All capacities are based on nominal
condenser airflow.4. SHC is based on 80 F db temperature of air
entering the coil.
Below 80 F edb, subtract (corr factor x cfm) from SHC.Above 80 F
edb, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
5. The following formulas may also be used.
tlwb = Wet-bulb temperature corresponding to enthalpy of air
leaving evaporator coil (h)
Where: h = enthalpy of air entering evaporator coil.
50BYN012 (10 TON)
CondenserAir
Air Entering Evaporator — Cfm/BF3000/0.015 4000/0.031
5000/0.051
Air Entering Evaporator — Wet Bulb Temperature — Ewb (F)Cfm Temp
72 67 62 57 72 67 62 57 72 67 62 57
6000
75TC 141.8 129.3 118.1 111.2 148.9 136.2 125.2 123.0 153.6 140.7
131.4 131.4SHC 69.9 85.7 101.2 111.2 78.8 99.3 119.1 123.0 87.0
112.0 131.4 131.4kW 8.13 7.91 7.72 7.59 8.26 8.04 7.84 7.81 8.35
8.13 7.96 7.96
85TC 136.7 124.7 113.7 107.9 143.4 131.0 120.7 119.2 147.7 135.2
127.0 127.0SHC 67.9 83.7 99.1 107.9 76.7 97.2 116.8 119.2 84.9
109.8 127.0 127.0kW 8.92 8.68 8.48 8.37 9.05 8.81 8.62 8.59 9.14
8.91 8.74 8.74
95TC 131.3 119.7 109.2 104.4 137.5 125.7 116.0 115.1 141.4 129.4
122.5 122.5SHC 65.7 81.5 96.9 104.4 74.5 95.0 114.3 115.1 82.6
107.4 122.5 122.5kW 9.76 9.53 9.31 9.21 9.89 9.66 9.47 9.45 9.98
9.74 9.59 9.59
105TC 125.5 114.4 104.4 100.7 131.4 120.0 111.0 110.8 134.7
123.4 117.8 117.8SHC 63.5 79.3 94.6 100.7 72.3 92.7 111.0 110.8
80.3 105.0 117.8 117.8kW 10.66 10.41 10.19 10.11 10.80 10.56 10.36
10.35 10.88 10.63 10.52 10.52
115TC 119.6 108.9 99.5 96.7 124.7 113.9 106.1 106.1 127.7 117.2
112.7 112.7SHC 61.3 77.0 92.2 96.7 69.9 90.3 106.1 106.1 77.8 102.4
112.7 112.7kW 11.64 11.38 11.16 11.09 11.78 11.52 11.33 11.33 11.85
11.60 11.51 11.51
50BYN014 (12 TON)
CondenserAir
Air Entering Evaporator — Cfm/BF3600/0.06 4800/0.09
6000/0.11
Air Entering Evaporator — Wet Bulb Temperature — Ewb (F)Cfm Temp
72 67 62 57 72 67 62 57 72 67 62 57
7200
75TC 153.8 148.0 142.5 140.1 161.4 155.0 149.8 149.2 165.7 159.5
155.3 155.3SHC 79.2 100.3 123.9 140.1 87.5 113.8 143.8 149.2 94.9
125.8 155.3 155.3kW 9.15 9.05 9.06 9.01 9.40 9.29 9.21 9.20 9.41
9.30 9.23 9.23
85TC 148.4 142.7 137.5 135.5 155.1 149.3 144.3 144.0 159.4 153.4
149.7 149.7SHC 77.0 97.9 121.5 135.5 85.2 111.3 141.1 144.0 92.4
123.1 149.7 149.7kW 10.15 10.05 9.99 9.95 10.35 10.24 10.15 10.14
10.41 10.30 10.23 10.23
95TC 142.7 137.2 132.3 130.7 148.8 143.2 138.6 138.6 152.8 147.1
143.9 143.9SHC 74.7 95.4 119.0 130.7 82.8 108.6 138.6 138.6 89.8
120.4 143.9 143.9kW 11.21 11.10 11.01 10.97 11.36 11.25 11.16 11.15
11.47 11.36 11.29 11.29
105TC 136.6 131.4 126.7 126.6 142.3 136.9 133.0 133.0 145.9
140.5 137.8 137.8SHC 72.3 92.8 116.4 125.6 80.2 105.8 133.0 133.0
87.2 117.6 137.8 137.8kW 12.32 12.20 12.07 12.04 12.44 12.32 12.24
12.23 12.59 12.48 12.40 12.40
115TC 130.2 125.2 120.8 120.1 135.4 130.4 127.0 127.0 138.6
133.6 131.5 131.5SHC 69.8 90.1 113.8 120.1 77.5 102.8 127.0 127.0
84.4 114.6 131.5 131.5kW 13.49 13.38 13.22 13.19 13.59 13.48 13.40
13.40 13.78 13.67 13.61 13.61
BF — Bypass FactorEwb — Entering Wet-BulbkW — Compressor Motor
Power Input (kilowatts)SHC — Sensible Heat Cap. (1000 Btuh)TC —
Total Cap. (1000 Btuh) Gross
BYPASSFACTOR
(BF)
ENTERING AIR DRY-BULB TEMP (F)79 78 77 76 75 under 7581 82 83 84
85 over 85
Correction Factor.05 1.045 2.09 3.14 4.18 5.23
Use formulashown below.
.10 .98 1.98 2.97 3.96 4.95
.20 .88 1.76 2.64 3.52 4.40
.30 .77 1.54 2.31 3.08 3.85
.35 .72 1.43 2.15 2.86 3.58
tldb = tedb –sensible capacity (Btuh)
1.10 x cfm
hldb = hedb –total capacity (Btuh)
4.5 x cfm
Performance data (cont)
-
13
GROSS COOLING CAPACITIES (cont)
LEGEND
Shaded area in table indicates nominal cfm values.
NOTES:1. Direct interpolation is permissible. Do not
extrapolate.2. Gross capacities do not include deduction of
indoor-fan motor heat.3. All capacities are based on nominal
condenser airflow.4. SHC is based on 80 F db temperature of air
entering the coil.
Below 80 F edb, subtract (corr factor x cfm) from SHC.Above 80 F
edb, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
5. The following formulas may also be used:
tlwb = Wet-bulb temperature corresponding to enthalpy of air
leaving evaporator coil (h)
Where: h = enthalpy of air entering evaporator coil.
50BYN016 (15 TON)
CondenserAir
Air Entering Evaporator — Cfm/BF4500/0.22 6000/0.35
7500/0.45
Air Entering Evaporator — Wet Bulb Temperature — Ewb (F)Cfm Temp
72 67 62 57 72 67 62 57 72 67 62 57
9000
75TC 186.2 169.6 154.4 149.0 194.0 177.4 163.8 163.4 200.0 182.6
173.2 173.0SHC 90.8 115.2 138.6 149.0 102.0 134.0 163.8 163.4 113.6
151.4 173.2 173.0kW 10.48 10.22 9.88 9.88 10.62 10.36 10.14 10.14
10.72 10.46 10.30 10.30
85TC 179.4 163.2 149.0 144.6 187.2 170.4 158.0 158.0 192.0 175.2
167.4 167.8SHC 88.6 112.4 135.8 144.6 100.2 131.2 158.0 158.0 111.6
148.8 167.4 167.8kW 11.78 11.48 11.22 11.12 11.94 11.62 11.40 11.40
12.04 11.74 11.60 11.58
95TC 172.2 157.4 143.0 140.0 179.6 163.8 153.2 153.0 184.0 168.2
161.8 162.0SHC 85.4 110.0 133.2 140.0 97.0 128.6 153.2 153.0 108.2
146.0 161.8 162.0kW 13.16 12.84 12.50 12.44 13.34 13.00 12.76 12.74
13.44 13.10 12.96 12.96
105TC 165.4 150.8 137.6 135.4 172.2 156.8 147.6 147.4 176.0
160.8 156.0 156.2SHC 83.0 107.4 130.6 135.4 94.8 125.4 147.6 147.4
105.4 143.0 156.0 156.2kW 14.62 14.26 13.90 13.84 14.82 14.42 14.20
14.20 14.92 14.56 14.42 14.42
115TC 158.2 144.2 131.8 130.6 164.0 149.8 142.0 142.2 167.6
153.4 150.0 150.0SHC 80.6 104.6 127.8 130.6 91.8 123.0 142.0 142.2
130.4 140.0 150.0 150.0kW 16.18 15.76 15.38 15.35 16.36 15.96 15.72
15.72 16.48 16.08 15.98 15.98
50BYN024 (20 TON)
CondenserAir
Air Entering Evaporator — Cfm/BF6000/0.15 8000/0.30
10,000/0.40
Air Entering Evaporator — Wet Bulb Temperature — Ewb (F)Cfm Temp
72 67 62 57 72 67 62 57 72 67 62 57
12,000
75TC 270.9 246.9 224.7 213.3 284.7 259.8 237.9 235.2 293.4 267.0
250.2 250.5SHC 129.6 162.0 193.8 213.3 146.1 188.1 228.6 235.2
161.7 211.8 250.2 250.5kW 15.51 15.12 14.76 14.58 15.75 15.36 15.00
14.97 15.90 15.48 15.21 15.21
85TC 261.3 237.9 217.2 207.0 274.2 250.2 229.2 228.0 282.0 257.1
242.1 242.7SHC 125.7 158.1 190.2 207.0 141.9 184.5 223.8 228.0
157.2 207.6 242.1 242.7kW 17.40 16.95 16.56 16.38 17.67 17.22 16.83
16.80 17.82 17.37 17.07 17.10
95TC 251.7 229.5 209.1 201.3 263.4 240.0 221.4 220.8 270.3 246.9
234.6 234.6SHC 122.4 154.5 186.3 201.3 138.3 180.0 219.3 220.8
152.4 204.0 234.6 234.6kW 19.41 18.93 18.48 18.30 19.71 19.20 18.78
18.75 19.86 19.35 19.08 19.08
105TC 241.5 220.2 200.4 194.4 252.3 230.1 213.3 213.3 258.9
236.4 225.9 225.9SHC 118.8 151.2 182.4 194.4 134.4 175.8 213.3
213.3 149.7 199.8 225.9 225.9kW 21.57 21.03 20.52 20.34 21.84 21.30
20.88 20.88 22.05 21.48 21.24 21.21
115TC 231.3 210.9 192.0 187.5 240.9 219.9 205.2 205.2 246.9
225.9 217.5 217.8SHC 114.3 147.0 178.8 187.5 130.5 172.5 205.5
205.2 145.2 196.2 217.5 217.8kW 23.85 23.25 22.68 22.53 24.15 23.55
23.10 23.10 24.33 23.76 23.52 23.52
BF — Bypass FactorEwb — Entering Wet-BulbkW — Compressor Motor
Power Input (kilowatts)SHC — Sensible Heat Cap. (1000 Btuh)TC —
Total Cap. (1000 Btuh) Gross
BYPASSFACTOR
(BF)
ENTERING AIR DRY-BULB TEMP (F)79 78 77 76 75 under 7581 82 83 84
85 over 85
Correction Factor.05 1.045 2.09 3.14 4.18 5.23
Use formulashown below.
.10 .98 1.98 2.97 3.96 4.95
.20 .88 1.76 2.64 3.52 4.40
.30 .77 1.54 2.31 3.08 3.85
.35 .72 1.43 2.15 2.86 3.58
tldb = tedb –sensible capacity (Btuh)
1.10 x cfm
hldb = hedb –total capacity (Btuh)
4.5 x cfm
-
14
ACCESSORY HEATING COIL CAPACITIES
LEGEND
*Steam distributing coil — 1 row, ratings based on 2 psig steam,
60 Fentering air.
†Hot water coil — 2 row, ratings based on 200 F entering water
temper-ature, 20 F water temperature drop, 60 F entering air
temperature
NOTES:1. Maximum allowable leaving air temperature 140 F.2.
Maximum operating limit for heating coils is 200 psig or 400 F.3.
To obtain capacities other than those given above, multiply the
Btuh
value from the Accessory Heating Coil Capacities table by
theproper value from the Heating Capacity Correction Factors
table.
4. Formulas:Leaving Air Temperature — LAT = edb (F) + (TC
Btuh/1.1 x cfm])Gpm = TC (Btuh) (500 x ΔT water [F])
5. Reduced airflow (caused by dirty filters, loose or broken fan
belts,etc.) over coil during cooling cycle may result in freeze-up
of nearbyheating coil. Since units normally require a low pressure
switchcutout setting at about 27 F, use of a freeze-up thermostat
is recom-mended if heating coil is not drained or filled with an
antifreezesolution.
6. Field-supplied thermostat and control valve are required when
usingaccessory heating coils.
HEATING CAPACITY CORRECTION FACTORS
UNIT50BYN CFM
STEAM DISTRIBUTING COIL* HOT WATER COIL†TC
(Btuh)LAT(F)
Air Δ P(in. wg)
TC(Btuh)
LAT(F) GPM
Water Δ P(Psig)
Air Δ P(in. wg)
0061,500 116 130 0.04 101 120 10 3.7 0.042,000 134 120 0.05 117
112 12 4.6 0.052,500 147 115 0.08 131 107 13 5.8 0.08
0082,250 97 100 0.02 172 131 17 3.5 0.043,000 118 96 0.04 211
125 21 4.6 0.083,750 132 93 0.06 239 119 24 5.5 0.12
0123,000 118 96 0.04 211 125 21 4.6 0.084,000 137 92 0.07 247
117 25 4.8 0.145,000 153 88 0.10 276 111 28 6.8 0.21
0143,600 164 99 0.04 243 120 24 5.0 0.084,800 177 92 0.06 292
114 29 6.0 0.146,000 231 91 0.08 323 107 32 7.1 0.21
0164,500 209 102 0.05 307 122 30 5.1 0.016,000 234 95 0.07 363
115 36 6.2 0.167,500 256 91 0.09 396 108 39 7.4 0.23
0246,000 209 92 0.01 410 126 41 2.4 0.058,000 246 88 0.02 500
118 50 3.5 0.08
10,000 272 85 0.03 580 114 58 3.9 0.11
LAT — Leaving Air Temperature (F)TC — Total Heating Capacity
(1000 Btuh)ΔP — Pressure Drop
STEAM COIL
Steam Pressure(Psig)
Entering Air Temperature (F)40 50 60 70 80
0 1.11 1.03 0.96 0.89 0.822 1.14 1.07 1.00 0.93 0.865 1.19 1.11
1.05 0.98 0.91
10 1.25 1.18 1.11 1.04 0.97
HOT WATER COILWater
Temp (F)Drop
EnteringWater
Temp (F)
Entering Air Temperature (F)
40 50 60 70 80
10180 1.06 0.98 0.90 0.83 0.75200 1.22 1.15 1.07 1.00 0.92220
1.39 1.32 1.24 1.17 1.09
20180 0.98 0.91 0.83 0.75 0.68200 1.15 1.08 1.00 0.93 0.85220
1.32 1.25 1.17 1.10 1.02
30180 0.91 0.83 0.76 0.68 0.60200 1.08 1.00 0.93 0.85 0.78220
1.25 1.18 1.10 1.03 0.95
Performance data (cont)
-
15
CONDENSER FAN PERFORMANCE
LEGENDBhp — Brake Horsepower
Shaded areas require field-supplied drive.
50BYNSTATIC PRESSURE (in. wg)
Cfm0.0 0.2 0.4 0.6 0.8 1.0
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp
006
2,000 566 0.18 710 0.30 846 0.40 972 0.46 1070 0.61 1130
0.722,500 753 0.40 880 0.59 927 0.63 1020 0.79 1105 1.10 1184
1.353,000 940 0.83 985 0.90 1080 1.00 1122 1.10 1200 1.29 1320
1.463,500 1047 1.20 1140 1.47 1173 1.50 1250 1.70 1292 1.40 1360
1.594,000 1250 1.94 1257 2.00 1333 2.10 1390 2.41 1410 2.60 1470
2.76
008
3,000 547 0.30 670 0.54 751 0.60 840 0.80 920 1.10 995 1.503,750
760 0.89 824 1.10 920 1.25 964 1.30 1040 1.53 1110 2.104,500 910
1.53 940 1.70 1020 1.90 1090 2.08 1173 2.40 1240 2.595,250 1020
2.00 1095 2.40 1170 2.90 1180 3.00 1240 3.10 1300 3.536,000 1180
3.10 1195 3.20 1260 3.70 1320 4.16 1380 4.80 1440 5.60
012
4,000 665 0.40 803 0.65 920 0.97 989 1.20 1080 1.48 1163
1.905,000 830 0.82 912 1.20 1010 1.55 1088 1.70 1170 2.00 1246
2.506,000 976 1.70 1070 2.16 1131 2.30 1210 2.66 1318 2.90 1390
3.367,000 1120 2.85 1198 3.00 1273 3.20 1343 3.70 1410 4.21 1474
4.908,000 1282 3.90 1353 4.50 1420 5.06 1517 5.30 1580 5.93 1640
6.70
014
4,800 703 0.62 840 1.05 860 1.10 950 1.29 1090 1.62 1172
2.026,000 853 1.12 902 1.60 1060 2.10 1130 2.30 1210 2.66 1290
3.207,200 1045 2.40 1140 3.00 1191 3.20 1270 3.62 1290 3.79 1357
4.608,400 1190 3.60 1270 4.20 1340 4.89 1421 5.10 1490 5.85 1560
6.709,600 1380 5.70 1452 6.50 1520 7.13 1550 7.20 1611 7.50 1670
8.23
016
6,000 600 0.60 720 1.02 820 1.51 910 2.10 950 2.20 1025
2.807,500 736 1.50 833 1.86 920 2.50 1015 2.80 1040 3.08 1106
3.809,000 942 3.20 1030 3.60 1040 4.20 1110 4.50 1141 4.80 1230
5.03
10,500 1075 5.10 1150 6.25 1220 6.80 1280 6.72 1340 7.50 1400
8.5012,000 1230 7.10 1310 8.20 1350 8.96 1410 9.20 1465 9.80 1470
10.10
024
8,000 560 1.68 640 2.04 705 2.40 770 3.00 850 3.60 920
3.9810,000 710 3.36 760 3.72 820 4.20 870 4.80 930 5.40 975
6.0012,000 845 5.28 890 5.70 945 6.20 975 6.71 1025 7.26 1090
7.7014,000 960 8.14 1020 8.80 1076 9.24 1090 9.90 1125 10.50 1150
11.0016,000 1090 11.60 1150 12.50 1190 12.80 1200 13.20 1230 13.70
1250 14.00
-
16
EVAPORATOR FAN PERFORMANCE
LEGENDBhp — Brake Horsepower to Supply FanNOTES:1. Italics
indicates field-supplied drive is required.2. Do not operate in
area.
LEGENDBhp — Brake Horsepower to Supply FanNOTES:1. Italics
indicates field-supplied drive is required.2. Do not operate in
area.
LEGENDBhp — Brake Horsepower to Supply FanNOTES:1. Italics
indicates field-supplied drive is required.2. Do not operate in
area.
50BYN006 UNIT
Airflow(cfm)
Available External Static Pressure (in. wg)0.2 0.4 0.6 0.8 1.0
1.2 1.4
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp1500 816
0.24 955 0.32 1096 0.41 1227 0.49 1347 0.59 1454 0.71 1546 0.861750
903 0.35 1025 0.43 1138 0.53 1260 0.63 1374 0.73 1481 0.83 1583
0.952000 987 0.48 1088 0.56 1197 0.67 1298 0.78 1405 0.90 1507 1.02
1606 1.132250 1073 0.66 1169 0.75 1261 0.84 1353 0.96 1443 1.09
1537 1.22 1631 1.362500 1161 0.87 1246 0.95 1329 1.06 1417 1.18
1497 1.31 1577 1.45 — —
50BYN008 UNIT
Airflow(cfm)
Available External Static Pressure (in. wg)0.2 0.4 0.6 0.8 1.0
1.2 1.4
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp2250 813
0.46 908 0.56 1010 0.67 1125 0.80 1230 0.94 1330 1.09 1420 1.242500
872 0.59 962 0.70 1046 0.81 1141 0.94 1246 1.09 1341 1.24 1433
1.402750 933 0.75 1019 0.87 1092 0.99 1171 1.12 1259 1.26 1354 1.42
1443 1.593000 993 0.94 1068 1.06 1145 1.19 1213 1.32 1287 1.47 1367
1.62 1453 1.803250 1055 1.15 1127 1.28 1199 1.42 1261 1.56 1325
1.71 1394 1.86 — —3500 1117 1.40 1182 1.55 1245 1.68 1316 1.84 1371
1.98 — — — —3750 1180 1.68 1239 1.83 1302 1.97 — — — — — — — —
50BYN012 UNIT
Airflow(cfm)
Available External Static Pressure (in. wg)0.2 0.4 0.6 0.8 1.0
1.2 1.4
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp3000 733
0.63 823 0.76 918 0.93 1013 1.13 1115 1.34 — — — —3250 774 0.77 856
0.90 942 1.07 1030 1.26 1120 1.49 1213 1.72 — —3500 816 0.93 891
1.07 969 1.23 1050 1.42 1132 1.64 1216 1.89 1303 2.143750 858 1.10
927 1.25 999 1.42 1073 1.60 1149 1.82 1226 2.07 1305 2.334000 901
1.30 965 1.46 1031 1.62 1100 1.81 1170 2.02 1241 2.26 1313 2.534250
944 1.52 1003 1.69 1064 1.86 1128 2.05 1193 2.26 1260 2.49 1327
2.754500 986 1.76 1042 1.94 1099 2.12 1158 2.31 1219 2.52 1281 2.75
1344 3.004750 1028 2.04 1082 2.22 1135 2.41 1191 2.60 1247 2.81 — —
— —5000 1071 2.34 1122 2.52 1172 2.72 1224 2.92 — — — — — —
Performance data (cont)
-
17
EVAPORATOR FAN PERFORMANCE (cont)
LEGENDBhp — Brake Horsepower to Supply FanNOTES:1. Italics
indicates field-supplied drive is required.2. Do not operate in
area.
LEGENDBhp — Brake Horsepower to Supply FanNOTES:1. Italics
indicates field-supplied drive is required.2. Do not operate in
area.
LEGENDBhp — Brake Horsepower to Supply FanNOTES:1. Italics
indicates field-supplied drive is required.2. Do not operate in
area.
50BYN014 UNIT
Airflow(cfm)
Available External Static Pressure (in. wg)0.2 0.4 0.6 0.8 1.0
1.2 1.4
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp3750 680
0.79 770 0.95 840 1.11 920 1.28 990 1.46 1050 1.64 1120 1.834000
710 0.92 790 1.09 860 1.26 930 1.44 1000 1.62 1060 1.81 1130
2.014250 740 1.07 810 1.25 880 1.43 950 1.61 1020 1.81 1080 2.00
1140 2.214500 770 1.24 840 1.42 910 1.61 970 1.81 1040 2.01 1100
2.21 1160 2.424800 800 1.45 870 1.65 940 1.85 1000 2.05 1060 2.26
1120 2.48 1170 2.705250 860 1.83 920 2.04 980 2.26 1040 2.48 1100
2.70 1150 2.93 1200 3.165500 890 2.06 950 2.28 1000 2.50 1060 2.73
1110 2.96 1170 3.20 1220 3.445750 920 2.32 970 2.54 1030 2.77 1080
3.01 1140 3.25 1190 3.50 1240 3.756000 950 2.59 1000 2.82 1060 3.06
1110 3.31 1160 3.56 1210 3.81 1260 4.07
50BYN016 UNIT
Airflow(cfm)
Available External Static Pressure (in. wg)0.2 0.4 0.6 0.8 1.0
1.2 1.4
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp4500 883
1.06 980 1.27 1093 1.52 1202 1.80 1304 2.09 1397 2.40 1477 2.725000
951 1.37 1034 1.59 1127 1.85 1231 2.13 1328 2.44 1421 2.76 — —5500
1018 1.73 1091 1.97 1170 2.23 1258 2.52 1352 2.84 1442 3.17 — —6000
1077 2.14 1152 2.41 1220 2.67 1295 2.96 1376 3.28 1462 3.63 — —6500
1138 2.62 1214 2.91 1275 3.18 1339 3.48 1409 3.80 1484 4.15 — —7000
1204 3.15 1268 3.44 1332 3.76 1389 4.06 1450 4.39 — — — —7500 1264
3.79 1322 4.08 1390 4.41 1443 4.73 — — — — — —
50BYN024 UNIT
Airflow(cfm)
Available External Static Pressure (in. wg)0.2 0.4 0.6 0.8 1.0
1.2 1.4
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp6,000 705
1.18 793 1.43 887 1.74 982 2.12 1082 2.54 — — — —6,500 746 1.44 826
1.70 910 2.01 998 2.38 1086 2.81 — — — —7,000 787 1.73 860 2.02 937
2.32 1017 2.68 1099 3.10 1181 3.58 — —7,500 829 2.07 897 2.38 967
2.68 1041 3.04 1116 3.45 1193 3.91 1269 4.438,000 871 2.45 935 2.77
1000 3.09 1067 3.45 1137 3.85 1208 4.30 1280 4.808,500 914 2.89 974
3.21 1034 3.55 1097 3.90 1161 4.30 1227 4.75 1294 5.239,000 956
3.37 1013 3.69 1070 4.06 1128 4.42 1188 4.82 1249 5.25 1312
5.739,500 999 3.90 1054 4.23 1106 4.62 1161 5.00 1217 5.39 1274
5.82 1333 6.30
10,000 1043 4.49 1094 4.82 1145 5.22 1196 5.63 1248 6.03 1302
6.46 1357 6.93
-
18
LEGEND
*Minimum Ckt Amps and MOCP Amps values per NEC (see Note 1).†The
overcurrent protective device for the unit shall be fuse or
HACRcircuit breaker (see Note 1).
NOTES:1. In compliance with NEC requirements for multimotor and
combina-
tion load equipment (NEC Articles 430 and 440), the
overcurrentprotective device for the unit shall be fuse or HACR
circuit breaker.Canadian units may be fuse or circuit breaker.
2. Wire sizing amps are a sum of 125% of the compressor RLA
plus100% of indoor fan motor FLA.
3. Motors are protected against primary single phasing
condition.4. Indoor-fan motors are 3-phase motors of same voltage
as unit.5. Three-phase voltage imbalance must not exceed 2
percent.
50BYN UNIT V-Ph-Hz
COMPRESSOR 1 COMPRESSOR 2 COMPRESSOR 3 OUTDOORFAN MOTORINDOOR
FAN
MOTOR POWER SUPPLY*
RLA LRA RLA LRA RLA LRA Hp FLA Hp FLA MCA MOCP†
006208/230-3-60 16.0 125.0 — — — — 2.0 5.8 1.5 4.4 30.2 40
460-3-60 7.2 56.5 — — — — 2.0 2.6 1.5 2.0 13.6 20575-3-60 5.8
45.2 — — — — 2.0 2.1 1.5 1.6 10.9 15
008208/230-3-60 18.9 146.0 — — — — 3.0 8.6 2.0 5.8 38.0 45
460-3-60 8.5 66.0 — — — — 3.0 3.9 2.0 2.6 17.2 25575-3-60 6.8
52.8 — — — — 3.0 3.1 2.0 2.1 13.7 20
012208/230-3-60 16.0 125.0 16.0 125.0 — — 5.0 14.2 3.0 8.6 58.8
70
460-3-60 7.2 56.5 7.2 56.5 — — 5.0 6.4 3.0 3.9 26.6 35575-3-60
5.8 45.2 5.8 45.2 — — 5.0 5.1 3.0 3.1 21.2 25
014208/230-3-60 16.0 125.0 18.9 146.0 — — 5.0 14.2 5.0 14.2 68.0
80
460-3-60 7.2 56.5 8.5 66.0 — — 5.0 6.4 5.0 6.4 30.7 40575-3-60
5.8 45.2 6.8 52.8 — — 5.0 5.1 5.0 5.1 24.5 30
016208/230-3-60 18.9 146.0 18.9 146.0 — — 5.0 14.2 5.0 14.2 70.9
80
460-3-60 8.5 66.0 8.5 66.0 — — 5.0 6.4 5.0 6.4 32.0 40575-3-60
6.8 52.8 6.8 52.8 — — 5.0 5.1 5.0 5.1 25.6 30
024208/230-3-60 18.9 146.0 18.9 146.0 18.9 146.0 7.5 20.5 7.5
20.5 102.8 110
460-3-60 8.5 66.0 8.5 66.0 8.5 66.0 7.5 9.3 7.5 9.3 46.6
50575-3-60 6.8 52.8 6.8 52.8 6.8 52.8 7.5 7.4 7.5 7.4 37.2 45
FLA — Full Load AmpsHACR — Heating, Air Conditioning and
RefrigerationLRA — Locked Rotor AmpsMCA — Minimum Circuit AmpsMOCP
— Maximum Overcurrent Protective Device
(see Note 1)NEC — National Electrical CodeRLA — Rated Load
Amps
Electrical data
-
19
Typical wiring schematic, 50BYN006-008
LEGEND
C — Compressor ContactorCB — Circuit BreakerCLO — Compressor
LockoutCR — Control RelayEQUIP — EquipmentGND — GroundHPS —
High-Pressure SwitchIFC — Indoor-Fan ContactorIFM — Indoor-Fan
MotorIFP — Indoor-Fan ProtectorLPS — Low-Pressure SwitchNEC —
National Electrical CodeOFC — Outdoor-Fan ContactorOFM —
Outdoor-Fan MotorOFP — Outdoor-Fan ProtectorTB — Terminal BlockTDR
— Time Delay RelayTRAN — Transformer
Terminal Box Connection
Marked Terminal
Unmarked Terminal
Splice
Factory Wiring
Field Wiring
NOTES:1. Fan motors are inherently thermally protected.2. Three
phase motors are protected under primary single
phase conditions.3. Use conductors suitable for at least 90 C
(194 F) when replac-
ing factory wiring.4. Use copper conductors only.5. Wiring for
field power supply must be rated at 75 C (167 F)
minimum.
-
20
Typical wiring schematic, 50BYN012-016
LEGEND
C — Compressor ContactorCB — Circuit BreakerCLO — Compressor
LockoutCR — Control RelayEQUIP — EquipmentGND — GroundHPS —
High-Pressure SwitchIFC — Indoor-Fan ContactorIFM — Indoor-Fan
MotorIFP — Indoor-Fan ProtectorLPS — Low-Pressure SwitchNEC —
National Electrical CodeOFC — Outdoor-Fan ContactorOFM —
Outdoor-Fan MotorOFP — Outdoor-Fan ProtectorTB — Terminal BlockTDR
— Time Delay RelayTRAN — Transformer
Terminal Box Connection
Marked Terminal
Unmarked Terminal
Splice
Factory Wiring
Field Wiring
NOTES:1. Fan motors are inherently thermally
protected.2. Three phase motors are protected under
primary single phase conditions.3. Use conductors suitable for
at least 90 C
(194 F) when replacing factory wiring.4. Use copper conductors
only.5. Wiring for field power supply must be rated
at 75 C (167 F) minimum.
-
21
Typical wiring schematic, 50BYN024
LEGEND
C — Compressor ContactorCB — Circuit BreakerCLO — Compressor
LockoutCR — Control RelayEQUIP — EquipmentGND — GroundHPS —
High-Pressure SwitchIFC — Indoor-Fan ContactorIFM — Indoor-Fan
MotorIFP — Indoor-Fan ProtectorLPS — Low-Pressure SwitchNEC —
National Electrical CodeOFC — Outdoor-Fan ContactorOFM —
Outdoor-Fan MotorOFP — Outdoor-Fan ProtectorTB — Terminal BlockTDR
— Time Delay RelayTRAN — Transformer
Terminal Box Connection
Marked Terminal
Unmarked Terminal
Splice
Factory Wiring
Field Wiring
NOTES:1. Fan motors are inherently thermally
protected.2. Three phase motors are protected under
primary single phase conditions.3. Use conductors suitable for
at least 90 C
(194 F) when replacing factory wiring.4. Use copper conductors
only.5. Wiring for field power supply must be rated
at 75 C (167 F) minimum.
-
22
Operating sequenceAll units require the addition of a thermostat
accessorypackage to complete the control circuit. The sequence
ofoperation may vary depending on which package
isselected.Room-mounted thermostat — The unit uses anelectronic,
communicating electronic, or mechanical ther-mostat mounted in the
conditioned space.Fan circulation — When the thermostat selector
switch isset to the FAN position, the evaporator-fan motor
willoperate to provide air circulation.Cooling — The evaporator
will operate continuously orwhen the compressor runs, depending on
the setting of thethermostat fan selector switch. When the
thermostat closes(on a call for cooling), the control relay
outdoor-fan contac-tor and compressor contactor(s) close. The
control relaywill start the indoor fan if it is not already
running. Thecondenser fan contactor will start the condenser air
fanand the compressor contactors will immediately start
thecompressor(s). The 50BYN024 unit, as wired from thefactory, has
2 compressors on first stage and one on sec-ond stage; this may be
changed (see Application Data sec-tion of this product data).
A second stage on 50BYN012 to 024 units will close ifadditional
cooling demand is required, and will start thesecond-stage
compressor. When the thermostat is satisfied,the second stage
compressor will stop first, and then thefirst stage compressors
will stop when cooling demand issatisfied. The condenser will also
stop as soon as both cool-ing stages are satisfied.
Low ambient control on 50BYN units is accomplishedwith a
field-installed refrigerant operated damper locatedon the condenser
fan discharge. Low ambient operationdoes not affect operating
sequence.
A 5-minute timer, TDR (time-delay relay), will preventthe
compressor(s) from restarting for 5 minutes after anycompressor has
stopped.Heating — The evaporator fan will operate continuously
orwhen the thermostat calls for heating, depending on thesetting of
the thermostat fan selector switch. When thethermostat closes (on a
call for heating), the thermostatactivates the water or steam
control valve to meet heatingrequirements.TEMP system thermostat —
The TEMP system ther-mostat works like a room thermostat, but
provides forcommunicating control. The TEMP thermostat requiresthe
addition of an accessory relay pack to interface withthe unit. This
relay pack may be mounted in the low-voltage control compartment.
The system operation is thesame as stated in the Room-Mounted
Thermostat section.All units — The control circuit incorporates a
current-sensing lockout relay (Cycle-LOC™ device) that locks offthe
compressor(s) when any safety device is activated (lowor
high-pressure switches, condenser-fan motor overloador compressor
internal overload). If any compressor safetydevice opens, the
compressor(s) will stop and a 24-v signalwill be sent to the X
connection of the low-voltage terminalstrip. The signal may be used
to light an indicator light onthe unit or remotely. Since the unit
is protected by theCycle-LOC device, the compressor(s) will not
restart fol-lowing a safety interruption unless the thermostat is
satis-fied without cooling operation. To reset the Cycle-LOCcontrol
device, manually turn the control power to the unitOFF, then back
to the ON position.
High-pressure and low-pressure switches and motoroverload
protectors will reset automatically when the con-dition which
caused the device to trip has dropped belowthe reset condition.
Controls
-
23
Typical piping and wiring
LEGEND
NOTES:1. Wiring and piping shown are general points of
connection guides only
and are not intended for or to include all details for a
specific installation.2. All wiring must comply with applicable
local and national codes.3. All piping must follow standard piping
techniques. Refer to Carrier Sys-
tem Design Manual Part 3 for details.4. Connect both drains to
building waste system and provide a trap of suffi-
cient depth for unit static.
NEC — National Electrical Code
Condenser Airflow
Evaporator Airflow
Power WiringControl Wiring
-
24
LocationFor best results unit must be properly located and
installed.Selected location should not be adjacent to an
acousticallysensitive space, for example a conference room or
execu-tive office. The best location is in mechanical rooms
nearareas like elevators, restrooms, stairways, or similarspaces.
The mechanical room should use constructionmethods which will help
isolate the transmission of acousti-cal energy.
Since these units typically use large quantities of
ductedcondenser air, select a location with the best access to
anoutside window or wall to accommodate condenser air lou-ver.
Locate the unit as close to the wall opening as possiblebut allow
space for return air inlet and access to the evapo-rator and
condenser coil for cleaning. Units on the samefloor should have a
minimum of 6 ft between units to pre-vent recirculation of
condenser air. Units floor to floorshould have a minimum of 10 ft
between units to preventrecirculation. Units should not be located
with several unitspulling condenser air from a small space between
build-ings, where air may be recirculated. Recirculation of
con-denser air will result in increased head pressure which
maycause units to trip on high pressure.
There are several methods for applying 50BYN units indifferent
space applications. See page 27 for recom-mended equipment room
applications and locations of keycomponents.
Moving units into existing buildingsThe 50BYN units are designed
to pass through most36-in. door openings. The filter rack and duct
mountingflanges may also be removed. The height of the 024 sizeunit
exceeds some door openings. See the Splitting the50BYN024 Unit
section on page 26.
Unit mounting standWhen units are mounted to use an existing
window height,a field-supplied steel mounting stand is recommended.
Thestand should be built rigidly enough to support the weightof the
unit, and be braced to prevent any side to side move-ment of the
stand. A mounting height higher than the win-dow sill height is
recommended, which allows thecondenser duct to be pitched back to
the louver in the win-dow for rain elimination and drainage.
Unit isolationUnit compressors are internally isolated and the
compres-sor compartment is lined with acoustical insulation. If
addi-tional vibration isolation is desired, rubber in-shear padsare
recommended under the four corners of the unit.Spring isolation is
not recommended. All duct connectionsto the unit should be made
with flexible connections to pre-vent any transmission of vibration
to the ductwork.
AccessoriesCondenser air filters can be field-supplied, if
desired. Thiswill reduce the need to clean the condenser coil.
Seepage 27 for recommended location of condenser air
filters.Outside air connections and air economizer — Out-door
ventilation air is required for most spaces and the useof an
outdoor economizer cycle can save cooling energy.the 50BYN units
can be applied with field-provided ventila-tion control options,
including CO2 activated ventilation ordifferential economizer.
Several methods of bringing the airinto the unit are possible. A
mixing box with dampers tocontrol outdoor and return air is the
best method. A mixingbox assures adequate mixing of both
airstreams. When anintegrated economizer cycle (compressors can
operatewith full outdoor air) is used, it is recommended that
anevaporator defrost thermostat be put in the unit. This con-trol
will turn off the compressors when frost begins to formon the
evaporator coil.Heating coils — Accessory steam and hot water coils
aremounted in the unit return air before the cooling coil.
Thefilter rack provided with the unit is removed, the coilmounted
in the same position and the filter rack reattachedto the coil. The
same filter rack may be used with ducted orfree return. Care must
be exercised in location of outsideventilation or economizer air in
to the unit when heatingcoils are used to prevent coil freeze up.
Make sureadequate mixing of return and outside air is provided
toprevent below freezing temperatures at any point of thecoil. Also
be sure that dampers close off outdoor air duringunit shutdown.
Spring return outdoor-air dampers arerecommended.Discharge plenum —
When unit is to be used directly inthe space to be conditioned
without ductwork attached, adischarge plenum with acoustical lining
and a dischargegrille on the unit are recommended. It is
recommendedthat the fan be slowed down to deliver no more than
nomi-nal cfm for best acoustical performance.
Condenser air filter racks, mixing boxes with outdoor airdampers
and economizers, and discharge plenums may befield fabricated or
are available through specialty accessorymanufacturers.
Application data
-
25
Evaporator ductworkSupply duct should be properly supported and
the aspectratio as close to square as possible. Duct should be
sized fora maximum of 2000 fpm velocity in areas outside
theequipment room. The duct should be lined with
acousticalinsulation for a minimum of 10 ft beyond the
equipmentroom. A flexible duct connection should be used on
theconnection to the unit to prevent transmission of any
unitvibrations into the duct.
Return duct may be attached to the unit, but is not nec-essary.
The return to the unit should prevent line of sightvisibility to
the space. Insulated return duct is also recom-mended for
acoustically sensitive spaces. Maximum veloc-ity should not exceed
1000 fpm over occupied spaces.Adequate return area is essential for
proper operation.
Condenser ductworkCondenser supply and discharge air ducts
should be asshort and straight as possible. Cross-sectional area of
theinlet and discharge should never be less than the face areaof
the unit openings. When bends must be made, theyshould be as
gradual as space limitations will allow. Detailsand dimensions of
correctly designed systems are shownon page 28. If the unit will be
operated in cold outdoorweather, or if dampers are not provided at
the louver,then the condenser ducts should be insulated to
preventcondensation.
Design of the louver used for the inlet and discharge ofthe
condenser airflow is critical to preventing recirculationof air and
high pressure tips. See page 28 for details ofcondenser louver. The
louver blades must be heavy enoughto prevent unit airflow from
drawing them together. Louverblades should be a minimum of 18 gage,
and widths over30 in. should have stiffeners. The inlet louver
should nothave a flange and the discharge louver should have a
flangewhich directs the air away from the inlet. The use of
adeflector in conjunction with the condenser air discharge isalso
recommended.
Piping trapsAll 50BYN units have a drain for the condensate from
theevaporator coil. This drain may be relocated to the oppo-site
side of the unit if job conditions dictate. The conden-sate trap
should have a depth adequate to allow 2 in. ofwater in the trap
with the unit running. Provide a clean-outon the trap and vent and
pitch the trap for proper drain-age. The condenser section has a
complete drain panwhich will collect any rain water which is pulled
into thecondenser or from any overflow of the evaporator pan.
Ifdesired, this secondary drain should be trapped for 1 in.
ofstatic and should have a clean-out and be vented andsloped for
drainage. If the condensate line and secondary
drain are connected, the connection must be at a level thatwill
not allow condensate to drain back into the secondarydrain.
Condenser head pressure controlUnits are not suitable for use
with Motormaster® speedcontrol. Low ambient operation is
accomplished with fandischarge dampers which operate with a
refrigerant con-trolled operator from lead compressor discharge
pressure.Since these units have a low-pressure switch, the use
ofwinter start kit is recommended (38AE-900---021). The kitbypasses
the low-pressure switch on start-up. The use of adefrost thermostat
kit (50BB-900---001) is also recom-mended to sense frost on the
evaporator coil if suctiontemperature drops too low.
ControlsAll units require a room mounted 24-v thermostat to
com-plete the control system. Carrier has several versions
ofthermostats to meet a wide range of job conditions, includ-ing
fully programmable and light-activated versions. Inaddition, the
unit can be connected to a TEMP thermostat,which allows networking
with other units and remote mon-itoring and control. A relay
control pack which mounts inthe unit control box is required for
the TEMP thermostatoperation. The 50BYN units may also be used with
theVVT® system when additional zone control is desired.
The 50BYN unit controls can be integrated with an airside
economizer with standard or differential enthalpycontrol.
When demand controlled ventilation is required, theCO2 sensor
can be used in conjunction with the TEMP sys-tem to optimize the
use of ventilation air.
Operational limitsAirflow — 200 to 500 cfm per tonAir
temperature to evaporator:CoolingMaximum 90 FMinimum 70
FHeatingMaximum 75 FMinimum 32 F (when no airflow)CondenserNominal
airflow 500 cfm per ton,Range: 300 to 600 cfm per tonCondenser air
temperatureMaximum 115 FMinimum without low ambient 55 FMinimum
with low ambient 0° F
-
26
Sound considerationsAll units are acoustically insulated. When
installed in ornear areas requiring additional sound attenuation:•
Locate unit in equipment room or closet• Use acoustic lining in
ductwork• Provide square duct elbows with acoustic lining and
turning vanes• Locate the first supply outlet no less than 10 ft
from a
lined elbow.• If unit is located in the conditioned space,
return air
opening from the space should be a lined elbow orequivalent.
• For critical applications, use packaged sound attenua-tors or
duct silencers. Sound attenuation may be usedon both evaporator air
and condenser air.
Setting condenser fan speedThe 50BYN condenser has a centrifugal
blower and a vari-able pitch drive which allow adjusting the
condenser air-flow to match the static from the louvers, ductwork,
filters,and sound traps (if used). It is best to adjust the fan to
thenominal airflow and the rpm which will achieve this
perfor-mance. Excess airflow and rpm will make units noisier.
Three independent circuit operationThe 50BYN024 unit has 3
compressors, each fully inde-pendent. Three-stage control is
possible with a thermostat
which will allow 3 stages of cooling. The third stage can
becontrolled by outdoor-air temperature to provide an addi-tional
stage with higher outdoor-air temperature. Whenstaging compressors,
always stage the circuits such that thefirst compressor operating
is the bottom circuit of theevaporator coil and then proceed up the
coil in sequence.
Splitting the 50BYN024 unitThe 50BYN024 unit height exceeds 80
in. and may notclear all door openings. To make it easier to move
this unitinto existing buildings, the unit may be split into 2
sections.When the unit is shipped, the correct refrigerant charge
isisolated in the condenser section with the rest of the sys-tem
under vacuum. If the unit will not be split at the job,the valves
are opened and the system is ready to run. If thesystem needs to be
split, the suction and liquid lines to theevaporator coil can be
disconnected at threaded connec-tions between the evaporator and
condenser sections. Theevaporator section may then be unbolted and
removed.When the unit is in place, the procedure is reversed andthe
unit put back together. The evaporator section is thenpulled to a
vacuum and the valves opened to allow thecharge to enter the unit.
Since the charge is isolated and avacuum is used, the use of
recovery equipment for normalinstallation of a split unit is not
required.
SOUND PRESSURE LEVELS
NOTES:6. Sound pressure taken in free discharge at a distance of
9.8 ft
(3 m). All readings are at nominal airflow.7. Sound pressure
measured in dB with respect to 20 micropascals.
50BYN UNIT PERFORMANCE
UNIT50BYN
INDOOR FAN(Octave Band)
OUTDOOR FAN(Octave Band)
125 250 500 1000 2000 4000 8000 125 250 500 1000 2000 4000
8000006 67.0 68.0 69.0 68.5 66.0 64.0 55.0 75.0 73.0 77.5 68.0 67.0
64.0 54.0008 76.0 71.0 73.0 72.0 69.0 66.0 59.0 75.5 76.0 77.0 70.0
67.5 63.5 53.0012 80.6 79.0 81.0 80.0 79.0 80.0 70.0 77.5 76.5 77.0
73.0 74.0 72.0 59.0014 74.6 74.5 77.0 71.5 71.0 71.0 60.0 80.0 80.0
79.0 77.5 78.0 76.5 64.0016 75.0 76.5 79.5 78.0 73.5 75.5 65.0 84.0
81.0 78.5 76.0 75.5 75.0 65.0024 77.0 75.5 78.5 76.5 74.5 77.5 64.5
83.0 86.5 85.5 80.5 83.5 83.5 72.0
50BYN UNITPERCENTAGE OF NOMINAL CONDENSER AIRFLOW
70 80 90 100 110 120Capacity % 98.0 98.8 99.5 100.0 100.4
100.7Compressor Power % 109.4 105.4 102.4 100.0 98.1 96.5Condenser
Fan Power % 61.0 70.0 83.0 100.0 122.0 149.0Discharge Pressure %
111.2 106.5 102.8 100.0 97.7 95.9Total Power % 100.5 99.1 99.0
100.0 102.2 105.4EER % 97.5 99.7 100.5 100.0 98.3 95.6
Application data (cont)
-
27
*Provide access to clean condenser coil.NOTE: Refer to
Installation Instructions for detailed louver information.
-
28
Application data (cont)
*
INLETLOUVER
F
BD
C
4 3/4" 1"
50BYN
A
DISCHARGELOUVER
50BYN
G
45°
5 5/8"
4"
4"
14 GAGE ALUMINUM OR18 GAGE GALVANIZED STEEL
FLANGENOT PERMISSIBLE
BLADE STIFFENERFOR LOUVER WIDTHSOVER 30"
5"
3"1/2"
4"1"
30°
EXHAUST
VANE DEFLECTOR
CONDENSER INTAKE
TYPICAL RECOMMENDED CONDENSER DUCT DIMENSIONS
*Access panel for condenser coil cleaning.
DIMENSIONS (in.)
UNIT50BYN A B C D F G
006 24 141/8 6 201/8 26 345/8008 24 153/4 6 213/4 26 411/8012 24
14 6 20 26 571/4014 24 14 6 20 26 64/4016 30 157/8 6 217/8 301/8
691/2024 30 18 6 24 361/4 78
INLET LOUVER DETAILDISCHARGE LOUVER DETAIL
DEFLECTOR DETAIL*
*Not to scale.
-
29
Indoor Self-Contained Air-Cooled UnitConstant Volume
ApplicationHVAC Guide SpecificationsSize Range: 5 to 20 TonsCarrier
Model Number: 50BYNPart 1 — General1.01 SYSTEM DESCRIPTION
Indoor packaged vertical air-cooled cooling unitusing hermetic
scroll compressors and built-in con-denser fan for cooling duty.
Unit shall discharge sup-ply air vertically or horizontally and
condenser airhorizontally as shown on contract drawings.
1.02 QUALITY ASSURANCEA. Units shall be rated in accordance with
ARI Stan-
dard 210/240 or 340/360 as appropriate.B. Unit shall be designed
to conform to ANSI/
ASHRAE 15, latest revision safety code, and ULStandard 1995, and
shall be UL listed under bothAmerican and Canadian Standards.
C. Unit shall be built in an ISO 9001:2000
certifiedmanufacturing facility and shall be fully run-tested.
D. Insulation, adhesive, and liner system shall meetNFPA 90A
requirements for flame spread andsmoke generation.
1.03 DELIVERY, STORAGE, AND HANDLINGUnits shall be stored and
handled according to man-ufacturer’s recommendations.
Part 2 — Products2.01 EQUIPMENT
A. General:Factory-assembled, single-piece, air-cooled
coolingunit. Unit shall consist of scroll refrigerant
compres-sor(s), indoor fan section with belt drive centrifugalfans
and motor, evaporator coil section with directexpansion coil and
drain pan, air-cooled condenserfan section with belt drive
centrifugal fans andmotor, factory wiring, piping and controls, and
asystem charge of refrigerant (R-22). Unit may beused with or
without return ductwork.
B. Unit Cabinet:1. Cabinet shall be constructed of minimum
18
gage zinc surface alloyed steel with a bakedenamel finish. Unit
shall be capable of with-standing ASTM B117 500-hour salt spray
test.
2. Cabinet shall be fully insulated. Evaporator sec-tion shall
have a full metal liner covering allinsulation, and condenser
section shall have fullsound attenuating insulation. Units shall
becapable of withstanding ARI insulating effi-ciency test at
minimum airflow without cabinetsweating.
3. Unit drain pan shall have positive slope to thedrain to
prevent standing water in pan.
4. Panels for servicing shall be easily removableusing a single
wrench size.
5. Flanges shall be provided on all evaporator andcondenser air
connections for attachment ofductwork.
6. Units larger than 80 in. tall shall be able to besplit into
sections no more than 80-in. high.Unit shall be designed to allow
refrigerantcharge to be isolated in the condenser sectionwhen the
unit is split, without the loss of refrig-erant charge.
C. Evaporator Fan Section:1. Fans shall be double inlet,
centrifugal wheel
with forward curved blades designed for contin-uous operation.
Fan wheel and scroll shall beconstructed of steel with corrosion
resistant fin-ish, and statically and dynamically balanced.
2. Fan shall be belt drive with an adjustable pitchmotor pulley
and fixed pitch fan pulley, withpermanently lubricated ball-bearing
type bear-ings. Units larger than 12 tons require 2 belts.
3. Motor shall be 3-phase high-efficiency NEMAframe TEFC
(totally enclosed fan cooled) of thesame voltage as the
compressor(s). Motor shallhave permanently lubricated ball
bearings.
4. Fan shall be easily field convertible from verticalto
horizontal discharge (except 014 unit size).
D. Compressor:Hermetic scroll compressors shall be internally
pro-tected with high pressure relief. Compressors shallbe factory
rubber shock mounted with internalspring vibration isolators.
E. Coils:1. Evaporator and condenser coil shall have alumi-
num plate fins mechanically bonded to seamlesscopper tubes with
all joints brazed. Tube sheetopenings shall be swaged to prevent
tube wear.Coils shall be face split design.
2. Direct expansion coil shall be designed andtested in
accordance with ANSI/ASHRAE 15,latest revision safety code.
3. Coil and drain pan shall be accessible throughservice access
panels for cleaning.
F. Filter:Filter frame shall be installed upstream of the
cool-ing coil, designed to take a 1-in. or 2-in. thick clean-able
or disposable type commercially available filter.Filters shall be
accessible from either side of the unitand filter rack shall be
usable with ducted or freereturn. Disposable filters will be
supplied with theunit.
G. Condenser:1. Fans shall be double inlet, centrifugal
wheel
with forward curved blades designed for contin-uous operation.
Fan wheel and scroll shall beconstructed of steel with corrosion
resistant fin-ish, and statically and dynamically balanced.
2. Fan shall be belt drive with an adjustable pitchmotor pulley
and fixed pitch fan pulley, with
Guide specifications
-
30
permanently lubricated, ball-bearing type bear-ings. Drives on
all motors 5 hp and larger shallhave a minimum of 2 belts.
3. Motor shall be 3-phase high-efficiency NEMAframe TEFC
(totally enclosed fan cooled) of thesame voltage as the
compressor(s). Motor shallhave permanently lubricated ball
bearings.
4. Condenser shall have a secondary drain panwith drain
connection to drain any overflow ofthe evaporator pan or rain in
the condensersection.
H. Operating Characteristics:Unit shall be capable of providing
a constant volumeof conditioned air at a specified static
pressurewithin the unit’s normal operating range. Unit shallhave
dual-stage cooling capacity control on all unitssizes 012 to 024.
Each compressor shall be on anindependent refrigerant circuit. Unit
shall be capableof starting and operating at up to 115 F
outdoorambient. Units shall be able to operate down to 0° Fwhen
equipped with low ambient damper.
I. Controls and Safeties:1. Units shall be furnished with a
control terminal
block for connection of low voltage controlsand thermostats.
2. Unit shall have one of the following controlsystems:a.
Room-mounted thermostat shall be mounted
in the conditioned space. Thermostat shallbe either
electromechanical or electronictype. Thermostat subbase shall
control fanoperation and be capable of turning unit onand off.
b. Room-mounted thermostat with communi-cating capability. This
thermostat shall oper-ate like the standard room-mountedthermostat
and shall provide the additionalbenefit of being able to
communicate withbuilding systems to facilitate unit operationand
control.
3. Units shall have the following factory-installed safeties:
high and low-pressureswitches, motor and compressor
overtempera-ture, current lockout, and inherent automaticfan motor
overload.
J. Electrical Requirements:All electrical power wiring shall
enter the unit cabi-net at a single location. Control circuit is
24-v, suit-able for a field-supplied 24-v thermostat.
K. Refrigerant Components:Refrigerant circuit components include
thermalexpansion valves, distributor with nozzle, filter dri-ers,
and charging service valves on each circuit.Suction line shall have
a refrigerant loop to preventrefrigerant drain back to the
compressor. Suctionpiping shall be insulated with closed cell
pipinginsulation.
L. Special Features:1. Heating Coil:
Field-installed steam coil shall be one row; orhot water coil
will be 2 rows with copper tubealuminum spiral fins and a
galvanized steel cas-ing. Fins shall be bonded to tubes by
mechani-cal expansion. Coil to be leak tested at 350 psigair
pressure submerged in water and chargedwith dry air. Coil shall
mount external to theunit.
2. Low Ambient Control Damper:Field-installed refrigerant
operated damper formounting on condenser air discharge.
Dampermodulates condenser air to control head pres-sure and permits
unit to operate in cooling evenin winter when outdoor air
temperature is low.Damper automatically restricts condenser
air-flow to maintain correct condensing pressurefor efficient
operation at temperatures down to0° F.
3. Thermostats:A complete line of thermostats shall be
avail-able to meet any application control require-ments.
Thermostat shall be provided by the unitmanufacturer.
4. Defrost Thermostat:Field-installed thermostat shall be
available toshut down compressor when frost builds onevaporator
coil.
5. Winter Start Kit:Package shall provide time delay for the
low-pressure switch.
6. Discharge Plenum:Kit shall be available for free blow
applications.
Guide specifications (cont)
-
Manufacturer reserves the right to discontinue, or change at any
time, specifications or designs without notice and without
incurring obligations.Pg 32 Catalog No. 04-52500027-01 Printed in
U.S.A. Form 50BYN-3PD
Replaces: 50BYN-2PDSection 5Tab 5a
Carrier Corporation • Syracuse, New York 13221 9-08
Features/BenefitsTable of ContentsModel Number NomenclatureARI
Capacity RatingsPhysical DataField-Installed AccessoriesBase Unit
DimensionsAccessory DimensionsSelection ProcedurePerformance
DataCooling CapacitiesHeating Coil CapacitiesCondenser Fan
PerformanceEvaporator Fan Performance
Electrical DataTypical Wiring SchematicControlsTypical Piping
and WiringApplication DataGuide Specifications
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