Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. PC 111 Catalog No. 535-00028 Printed in U.S.A. Form 50-8SI Pg 1 3-03 Replaces: 50-4SI Book 1 1 4 4 Tab 1b 5a 5a 6b Cancels: IIK 548-36-20 IIK 548-36-39 3/1/03 Installation Instructions Part Numbers: CRHEATER101A00 through CRHEATER119A00 CRSINGLE001A00 through CRSINGLE025A00 GENERAL Electric heater assembly consists of: 1 — Heater module 4 — Screws 1 — Wiring label 1 — Red wire (10 gage)* 1 — Splice connector* 1 — Wire tie* *Supplied with electric heater packages CRHEATER101A00, CRHEATER102A00, CRHEATER103A00, and CRHEATER104A00. Single point kit consists of: 1 — Single point box 1 — Bushing 5 — Screws 1 — Bracket and conduit drip boot assembly 1 — Tube clamp (used only on 3 and 4 ton heat pump units) NOTE: Single point kit not required on standard efficiency, 3 to 6 ton cooling units with an MOCP of 60 or lower. INSTALLATION 1. Remove electric heater modules and single point box from packaging and inspect for damage. NOTE: If there is a “1” in the ninth position of the heater part number, it indicates that the heater is in a carton. For example, CRHEATER105A00 is heater CRHEATER005A00 in a carton. 2. Remove indoor and outdoor access panels. See Fig. 1 and 2. Save panels and screws. 3. Remove control box cover and center post. Save screws. See Fig. 3. 4. Remove the single point box cover. Secure single point box to the underside of the control box with the 2 screws provided (Fig. 4). 5. Secure the conduit drip boot bracket assembly to the back of the single point box with 2 of the screws pro- vided (Fig. 4). The channel portion of the bracket assembly extends to the top panel behind the control box. Secure all wires to bracket with field-supplied wire tie as shown in Fig. 5. NOTE: The conduit drip boot and bracket are not used on standard efficiency 3 to 6 ton electric cooling units. 6. Remove heater cover(s) from heater mounting bracket. Save screws. Install single module electric heat option in location 1 (nearest the single point box). See Fig. 3 and 6. NOTE: Modules CRHEATER105A00, CRHEATER 109A00, CRHEATER112A00, CRHEATER114A00, CRHEATER115A00, and CRHEATER119A00 are keyed and must be installed in location 1 even when used as part of a 2-module option (Fig. 7). Turn off power to unit and install lockout tag. Small Rooftop Units Electric Cooling and Heat Pump Units 3 to 12 1 / 2 Tons Accessory Electric Heater and Single Point Box DISCONNECT MOUNTING LOCATION UNIT BLOCK-OFF PANEL OUTDOOR ACCESS PANEL INDOOR ACCESS PANEL DISCONNECT MOUNTING LOCATION UNIT BLOCK-OFF PANEL OUTDOOR ACCESS PANEL INDOOR ACCESS PANEL Fig. 1 — Typical Access Panel Location (3 to 6 Ton Units) Fig. 2 — Typical Access Panel Location (7 1 /2 to 12 1 /2 Ton Units)
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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 111 Catalog No. 535-00028 Printed in U.S.A. Form 50-8SI Pg 1 3-03 Replaces: 50-4SIBook 1 1 4 4
Tab 1b 5a 5a 6b
Cancels: IIK 548-36-20 IIK 548-36-393/1/03
Installation InstructionsPart Numbers: CRHEATER101A00 through CRHEATER119A00
CRSINGLE001A00 through CRSINGLE025A00
GENERAL
Electric heater assembly consists of:1 — Heater module 4 — Screws 1 — Wiring label 1 — Red wire (10 gage)* 1 — Splice connector* 1 — Wire tie**Supplied with electric heater packages CRHEATER101A00,CRHEATER102A00, CRHEATER103A00, and CRHEATER104A00.
Single point kit consists of:1 — Single point box 1 — Bushing5 — Screws1 — Bracket and conduit drip boot assembly1 — Tube clamp (used only on 3 and 4 ton heat pump units)NOTE: Single point kit not required on standard efficiency, 3 to6 ton cooling units with an MOCP of 60 or lower.
INSTALLATION
1. Remove electric heater modules and single point boxfrom packaging and inspect for damage.NOTE: If there is a “1” in the ninth position of theheater part number, it indicates that the heater is in acarton. For example, CRHEATER105A00 is heaterCRHEATER005A00 in a carton.
2. Remove indoor and outdoor access panels. See Fig. 1and 2. Save panels and screws.
3. Remove control box cover and center post. Savescrews. See Fig. 3.
4. Remove the single point box cover. Secure single pointbox to the underside of the control box with the 2screws provided (Fig. 4).
5. Secure the conduit drip boot bracket assembly to theback of the single point box with 2 of the screws pro-vided (Fig. 4). The channel portion of the bracketassembly extends to the top panel behind the controlbox. Secure all wires to bracket with field-suppliedwire tie as shown in Fig. 5.NOTE: The conduit drip boot and bracket are not usedon standard efficiency 3 to 6 ton electric cooling units.
6. Remove heater cover(s) from heater mounting bracket.Save screws. Install single module electric heat optionin location 1 (nearest the single point box). See Fig. 3and 6.NOTE: Modules CRHEATER105A00, CRHEATER109A00, CRHEATER112A00, CRHEATER114A00,CRHEATER115A00, and CRHEATER119A00 arekeyed and must be installed in location 1 even when usedas part of a 2-module option (Fig. 7).
Turn off power to unit and install lockout tag.
Small Rooftop UnitsElectric Cooling
and Heat Pump Units3 to 121/2Tons
Accessory Electric Heater and Single Point Box
DISCONNECT MOUNTINGLOCATION
UNIT BLOCK-OFFPANEL
OUTDOORACCESS PANEL
INDOORACCESSPANEL
DISCONNECT MOUNTINGLOCATION
UNITBLOCK-OFFPANEL
OUTDOORACCESS PANEL
INDOORACCESSPANEL
Fig. 1 — Typical Access Panel Location(3 to 6 Ton Units)
Fig. 2 — Typical Access Panel Location(71/2 to 121/2 Ton Units)
2
7. To install module, engage flange on heater with trackin unit and slide heater through mounting bracketopening. Fasten heater module to heater mountingbracket with the 4 screws saved from Step 6 (Fig. 4).NOTE: All 208/230-v heaters (except CRHEATER105A00) are factory-wired for 3-phase applicationsbut can be converted to single-phase by changing onewire as described in Step 8.Three-phase applications: Skip to Step 9.
8. On single-phase applications, rewire the heater as fol-lows (see Fig. 8-10):a. Connect 10-gage red wire to splice connector.b. Remove yellow wire from heater contactor terminal
11 and connect to splice connector.c. Using the wire tie provided, fasten red wire to heater
power wire harness near existing wire tie on heatermodule. This provides strain relief for the red wire.
9. Route power wires from heater module(s) through thefoam bushing in the center partition and into the singlepoint box (Fig. 4). If no single point box is required forthe unit and heater combination, run the heater highvoltage power wiring through the grommet holes to thefield-supplied disconnect (or optional factory-supplied80 amp disconnect). Heater control wiring should berun to the control box section.
10. Install bushing in hole between control box and singlepoint box. Route unit power pigtails through bushing(Fig. 4).
11. See Table 1 to determine the correct electrical datatable. Refer to Electrical Data Tables 2-25 todetermine the heater and single point box. From theElectrical table determine the MOCP with heatersand accessories, the number of heaters, and theCRSINGLE---A00 part number.The correct figure can be determined using Table 1.The unit type (cooling only, heat pump, or COBRA™combined unit), efficiency type (high, standardASHRAE 90.1 compliant, standard), and the unitvoltage are listed in Table 1. If more than one figure is
shown in Table 1, then there are different figures forunits based on an MOCP below or above 60 Amps.Use the correct figure based on the MOCP determinedfrom the correct electrical data table. Figures 11-15 arefor electric cooling units. Figures 16-20 are for heatpump units. Figures 21-28 are for COBRA combinedrooftop/energy recovery units.All fuses are 60 amp, time delay type, except forCRSINGLE025A00 which are 30 amps. All heatersare single bank heaters except CRHEATER011A00and 012A00 which are dual bank heaters. TheCRHEATER011A00 and 012A00 will be wired as twoheaters (i.e., 6 leads). Fusing is shown pictorially. Thesingle point box fuse location may not EXACTLYmatch the figure as shown, but the number of fuseswill match the number shown.The optional factory-supplied disconnect has amaximum rating of 80 amps. Above 80 amps a field-supplied disconnect is required.Single point boxes CRSINGLE001A00, 006A00 and011A00 do not include fuses and fuses are not requiredper the National Electric Code in these single pointboxes since sub-fusing is not required below 60 amps.Field-supplied pressure connectors are required toconnect wires.
12. Run control wires from heater module(s) to the controlwire terminal block located next to the heater mod-ule(s). Connect the control wires as shown in Fig. 29.Heat Pump UnitsThe electric heat is internally wired as the second stageof heat.Electric Cooling UnitsElectric cooling units with 2 electric heater modulescan be wired for one- or 2-stage options as shown inFig. 29. Connect single module heater option controlwire (violet) to TB4 terminal 1.
13. Replace the center post and secure the single point boxto the center post with one screw (Fig. 3).
Table 1 — Electric Heater Data and Wiring Reference
14. Remove knockouts for appropriate size conduit fromunit block-off panel and single point box. Install con-duit (rigid or electro-metallic tubing) through conduitdrip boot as shown in Fig. 5. Drip boot will acceptconduit sizes 3/4 in. to 11/2 inches. The drip boot elimi-nates the need for water-tight conduit fittings at thesingle point box.NOTE: Supply wiring must comply with NEC(National Electric Code) and all local requirements.
15. Place adhesive-backed wiring label on flanged side ofheater cover.
16. Fasten heater cover to heater module with 2 screwsprovided with heater. Flanges of cover should face out.
17. Set manual reset limit switch by depressing buttonlocated between the terminals on the switch. Refer toFig. 3 for switch location.
18. Close single point box cover and secure with onescrew.
19. Replace control box cover, using remainder of screwssaved from Step 3.
20. Replace indoor and outdoor panels with screws savedfrom Step 2.
21. Turn on unit power.22. Mark the appropriate block on the unit nameplate for
the accessory heater kW installed.
DISCONNECTMOUNTINGLOCATION
EMT OR RIGID CONDUIT(FIELD-SUPPLIED)
SINGLEPOINT BOX
CENTERPOST
HEATERCOVERS
HEATERMOUNTINGBRACKET
HEATERMODULE(LOCATION 2)
HEATERMODULE(LOCATION 1)
SINGLE POINTBOXMOUNTINGSCREW
BRACKET ANDCONDUITDRIP BOOT
MAINCONTROLBOX
CONTROL WIRE TERMINAL BLOCK
MANUAL RESETLIMIT SWITCH
ALLIED PA
MODEL NO.
ERIAL NO.
CORP.
1113
2123
OD
22.2
3123
ISTED AIRNDITIONINGUIP ACCESS 346N.
P / N 2- 5610-4 REV
1113
2123
CONTROLBOX
BUSHING
SINGLEPOINT BOXMOUNTINGSCREWS
FOAMBUSHING
DRIP BOOTBRACKETMOUNTINGSCREWS
HEATERRELAYS
POWERWIRES
HEATERMOUNTINGSCREWS
CONDUIT CONDUITDRIP BOOT
WIRE TIE
C—
CO
MM
30V—
OR
200V—
RD
OV
—Y
LD
24V 75VA
BD
236BN
—T
RA
N 3O
—B
V2075
E 60 H
Z 30-8703
Fig. 3 — Typical Component Location
Fig. 4 — Typical Single Point Kit Installation
Fig. 5 — Typical Conduit Installation
TRACK
FLANGE
Fig. 6 — Typical Module Installation
4
KEY
ALLIED PA
MODEL NO.
ERIAL NO.
1113
2123
OD
3123
ISTED AIRNDITIONINGUIP ACCESS 346N.
P / N 2- 5610-4 REV
ALLIED PA
MODEL NO.
ERIAL NO.
CORP.
1113
2123
OD
22.2
3123
ISTED AIRNDITIONINGUIP ACCESS 346N.
P / N 2- 5610-4 REV
RED WIRE
SPLICECONNECTOR
HEATERPOWERWIREHARNESS
Fig. 7 — Typical Electric Heat Installation
Fig. 8 — Typical 3-Phase Wiring Installed
LEGEND
Fig. 9 — Single-Phase Heater Wiring
HR — Heater RelayHTR — HeaterLS — Limit Switch
Fig. 10 — Typical Single-Phase Wiring Installed
5
NO SINGLE POINT BOX REQUIRED
Fig. 11 — Electric Heater Power Wiring Connections — Electric Cooling Units,
208/230-1-60 — Less Than 60 Amps MOCP
NO SINGLE POINT BOX REQUIRED (USE EXISTING SPACE IN UNIT) OR
CRSINGLE006A00 OR CRSINGLE011A00
Fig. 12 — Electric Heater Power Wiring Connections — Electric Cooling Units,
208/230-3-60, 460-3-60, 575-3-60 — Less Than 60 Amps MOCP
CRSINGLE004A00
Fig. 13 — Electric Heater Power Wiring Connections — Electric Cooling Units,
208/230-1-60 — Greater Than 60 Amps MOCP
CRSINGLE002A00 ORCRSINGLE007A00 OR
CRSINGLE012A00
CRSINGLE009A00 ORCRSINGLE015A00
Fig. 14 — Electric Heater Power Wiring Connections — Electric Cooling Units,
208/230-3-60 — Greater Than 60 Amps MOCP
CRSINGLE008A00 ORCRSINGLE014A00
Fig. 15 — Electric Heater Power Wiring Connections — Electric Cooling Units,
460-3-60 and 575-3-60 — Greater Than 60 Amps MOCP
6
Table 2 — Electrical Data — High-Efficiency Cooling Only Units
Table 2 — Electrical Data — High-Efficiency Cooling Only Units (cont)
LEGEND
*Used to determine minimum disconnect per NEC.†Heater capacity (kW) is based on heater voltage of 208 v, 240 v, 480 v or 575 v. Ifpower distribution voltage to unit varies from rated heater voltage, heater kW willvary accordingly.
NOTES:1. In compliance with NEC requirements for multimotor and combination load
equipment (refer to NEC Articles 430 and 440), the overcurrent protective devicefor the unit shall be fuse or HACR breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greaterthan 2%. Use the following formula to determine the percent of voltageimbalance.% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
= 457
Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
% Voltage Imbalance= 100 x
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximumallowable 2%.
3. Non-fused disconnect switch cannot be used when rooftop unit electrical ratingsexceed 80 amps.
4. 575-v units have UL, Canada approval only. Electric heaters are not available for3 to 6 ton, 575-v units.
Table 2 — Electrical Data — High-Efficiency Cooling Only Units (cont)
LEGEND
*Used to determine minimum disconnect per NEC.†Heater capacity (kW) is based on heater voltage of 208 v, 240 v, 480 v or 575 v. Ifpower distribution voltage to unit varies from rated heater voltage, heater kW willvary accordingly.
NOTES:1. In compliance with NEC requirements for multimotor and combination load
equipment (refer to NEC Articles 430 and 440), the overcurrent protective devicefor the unit shall be fuse or HACR breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greaterthan 2%. Use the following formula to determine the percent of voltageimbalance.% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
= 457
Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
% Voltage Imbalance= 100 x
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximumallowable 2%.
3. Non-fused disconnect switch cannot be used when rooftop unit electrical ratingsexceed 80 amps.
4. 575-v units have UL, Canada approval only. Electric heaters are not available for3 to 6 ton, 575-v units.
Table 2 — Electrical Data — High-Efficiency Cooling Only Units (cont)
LEGEND
*Used to determine minimum disconnect per NEC.†Heater capacity (kW) is based on heater voltage of 208 v, 240 v, 480 v or 575 v. If
power distribution voltage to unit varies from rated heater voltage, heater kW will varyaccordingly.
NOTES:1. In compliance with NEC requirements for multimotor and combination load equipment
(refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shallbe fuse or HACR breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greater than 2%.Use the following formula to determine the percent of voltage imbalance.% Voltage Imbalance
Example: Supply voltage is 460-3-60.AB = 452 vBC = 464 vAC = 455 v
= 457Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allowable2%.
3. Non-fused disconnect switch cannot be used when rooftop unit electrical ratingsexceed 80 amps.
4. 575-v units have UL, Canada approval only. Electric heaters are not available for 3 to6 ton, 575-v units.
UNITSIZE
NOMINALV-PH-Hz
IFMTYPE
CONVOUTLET
ELECTRIC HEATER POWER SUPPLY* DISCONNECT SIZENominal
FLA — Full Load AmpsHACR — Heating, Air Conditioning and RefrigerationIFM — Indoor (Evaporator) Fan MotorLRA — Locked Rotor AmpsMCA — Minimum Circuit AmpsMOCP — Maximum Overcurrent ProtectionNEC — National Electrical CodeUL — Underwriters’ Laboratories
= 100 xmax voltage deviation from average voltage
average voltage
Average Voltage =452 + 464 + 455
3
=1371
3
IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your localelectric utility company immediately.
7457
12
Table 2 — Electrical Data — High-Efficiency Cooling Only Units (cont)
LEGEND
*Used to determine minimum disconnect per NEC.†Heater capacity (kW) is based on heater voltage of 208 v, 240 v, 480 v or 575 v. If
power distribution voltage to unit varies from rated heater voltage, heater kW will varyaccordingly.
NOTES:1. In compliance with NEC requirements for multimotor and combination load equipment
(refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shallbe fuse or HACR breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greater than 2%.Use the following formula to determine the percent of voltage imbalance.% Voltage Imbalance
Example: Supply voltage is 460-3-60.AB = 452 vBC = 464 vAC = 455 v
= 457Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allowable2%.
3. Non-fused disconnect switch cannot be used when rooftop unit electrical ratingsexceed 80 amps.
4. 575-v units have UL, Canada approval only. Electric heaters are not available for 3 to6 ton, 575-v units.
FLA — Full Load AmpsHACR — Heating, Air Conditioning and RefrigerationIFM — Indoor (Evaporator) Fan MotorLRA — Locked Rotor AmpsMCA — Minimum Circuit AmpsMOCP — Maximum Overcurrent ProtectionNEC — National Electrical CodeUL — Underwriters’ Laboratories
= 100 xmax voltage deviation from average voltage
average voltage
Average Voltage =452 + 464 + 455
3
=1371
3
IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your localelectric utility company immediately.
7457
13
Table 3 — Electric Heating Usage — High-Efficiency Cooling Only Units
*Two heater packages required to provide kW indicated.†004 on units with convenience outlet.**002 on high-static units with convenience outlet.
NOTES:1. The rated heater voltage is 240, 480, and 575 v. If power distribution voltage varies from rated heater voltage, heater kW will vary accordingly.2. To determine heater kW at voltages other than those shown in table, use the following formula:
Heater kWnew = Heater kW rated x (unit power distribution voltage/rated heater voltage)2
As an example:For a 16 kW heater rated at 240 v with a power distribution voltage of 215 vkWnew = 16 kW (215/240)2
Table 4 — Electrical Data — Standard-Efficiency ASHRAE 90.1 Compliant Cooling Only Units (Without Convenience Outlet) (cont)
LEGEND
*Used to determine minimum disconnect per NEC.†Fuse or HACR circuit breaker.**Fuse only.
NOTES:1. In compliance with NEC requirements for multimotor and combination load equipment (refer to
NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACRbreaker. Canadian units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greater than 2%. Use thefollowing formula to determine the percent of voltage imbalance.
% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
= 457
Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.
3. For units with power exhaust: If a single power source is to be used, size wire to includepower exhaust MCA and MOCP. Check MCA and MOCP when power exhaust is poweredthrough the unit (must be in accordance with NEC and/or local codes). Determine the newMCA including the power exhaust using the following formula:MCA New = MCA unit only + MCA of Power ExhaustFor example, using a 5 ton unit with MCA = 28.9 and MOCP = 35, with CRPWREXH030A00power exhaust.MCA New = 28.9 amps + 1.6 amps = 30.5 ampsIf the new MCA does not exceed the published MOCP, then MOCP would not change. TheMOCP in this example is 35 amps, the MCA New is below 35, therefore the MOCP is accept-able. If “MCA New” is larger than the published MOCP, raise the MOCP to the next largersize. For separate power, the MOCP for the power exhaust will be 15 amps per NEC.
Table 4 — Electrical Data — Standard-Efficiency ASHRAE 90.1 Compliant Cooling Only Units (Without Convenience Outlet) (cont)
LEGEND
*Used to determine minimum disconnect per NEC.†Fuse or HACR circuit breaker.**Fuse only.
NOTES:1. In compliance with NEC requirements for multimotor and combination
load equipment (refer to NEC Articles 430 and 440), the overcurrentprotective device for the unit shall be fuse or HACR breaker. Canadianunits may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage isgreater than 2%. Use the following formula to determine the percentof voltage imbalance.
% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
= 457
Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
= 1.53%This amount of phase imbalance is satisfactory as it is below themaximum allowable 2%.
3. For units with power exhaust: If a single power source is to be used,size wire to include power exhaust MCA and MOCP. Check MCAand MOCP when power exhaust is powered through the unit (mustbe in accordance with NEC and/or local codes). Determine the newMCA including the power exhaust using the following formula:MCA New = MCA unit only + MCA of Power ExhaustFor example, using a 5 ton unit with MCA = 28.9 and MOCP = 35,with CRPWREXH030A00 power exhaust.MCA New = 28.9 amps + 1.6 amps = 30.5 ampsIf the new MCA does not exceed the published MOCP, then MOCPwould not change. The MOCP in this example is 35 amps, the MCANew is below 35, therefore the MOCP is acceptable. If “MCA New”is larger than the published MOCP, raise the MOCP to the nextlarger size. For separate power, the MOCP for the power exhaustwill be 15 amps per NEC.
Table 5 — Electrical Data — Standard-Efficiency ASHRAE 90.1 Compliant Cooling Only Units(With Convenience Outlet)
LEGEND
*Used to determine minimum disconnect per NEC.†Fuse or HACR circuit breaker.**Fuse only.
NOTES:1. In compliance with NEC requirements for multimotor and combination load equipment (refer to
NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACRbreaker. Canadian units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greater than 2%. Use thefollowing formula to determine the percent of voltage imbalance.
% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
= 457
Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.
3. For units with power exhaust: If a single power source is to be used, size wire to includepower exhaust MCA and MOCP. Check MCA and MOCP when power exhaust is poweredthrough the unit (must be in accordance with NEC and/or local codes). Determine the newMCA including the power exhaust using the following formula:MCA New = MCA unit only + MCA of Power ExhaustFor example, using a 5 ton unit with MCA = 28.9 and MOCP = 35, with CRPWREXH030A00power exhaust.MCA New = 28.9 amps + 1.6 amps = 30.5 ampsIf the new MCA does not exceed the published MOCP, then MOCP would not change. TheMOCP in this example is 35 amps, the MCA New is below 35, therefore the MOCP is accept-able. If “MCA New” is larger than the published MOCP, raise the MOCP to the next largersize. For separate power, the MOCP for the power exhaust will be 15 amps per NEC.
Table 5 — Electrical Data — Standard-Efficiency ASHRAE 90.1 Compliant Cooling Only Units(With Convenience Outlet) (cont)
LEGEND
*Used to determine minimum disconnect per NEC.†Fuse or HACR circuit breaker.**Fuse only.
NOTES:1. In compliance with NEC requirements for multimotor and combination load equipment (refer to
NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACRbreaker. Canadian units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greater than 2%. Use thefollowing formula to determine the percent of voltage imbalance.
% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
= 457
Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.
3. For units with power exhaust: If a single power source is to be used, size wire to includepower exhaust MCA and MOCP. Check MCA and MOCP when power exhaust is poweredthrough the unit (must be in accordance with NEC and/or local codes). Determine the newMCA including the power exhaust using the following formula:MCA New = MCA unit only + MCA of Power ExhaustFor example, using a 5 ton unit with MCA = 28.9 and MOCP = 35, with CRPWREXH030A00power exhaust.MCA New = 28.9 amps + 1.6 amps = 30.5 ampsIf the new MCA does not exceed the published MOCP, then MOCP would not change. TheMOCP in this example is 35 amps, the MCA New is below 35, therefore the MOCP is accept-able. If “MCA New” is larger than the published MOCP, raise the MOCP to the next largersize. For separate power, the MOCP for the power exhaust will be 15 amps per NEC.
Table 5 — Electrical Data — Standard-Efficiency ASHRAE 90.1 Compliant Cooling Only Units(With Convenience Outlet) (cont)
LEGEND
*Used to determine minimum disconnect per NEC.†Fuse or HACR circuit breaker.**Fuse only.
NOTES:1. In compliance with NEC requirements for multimotor and combination load equipment (refer to
NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACRbreaker. Canadian units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greater than 2%. Use thefollowing formula to determine the percent of voltage imbalance.
% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
= 457
Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.
3. For units with power exhaust: If a single power source is to be used, size wire to includepower exhaust MCA and MOCP. Check MCA and MOCP when power exhaust is poweredthrough the unit (must be in accordance with NEC and/or local codes). Determine the newMCA including the power exhaust using the following formula:MCA New = MCA unit only + MCA of Power ExhaustFor example, using a 5 ton unit with MCA = 28.9 and MOCP = 35, with CRPWREXH030A00power exhaust.MCA New = 28.9 amps + 1.6 amps = 30.5 ampsIf the new MCA does not exceed the published MOCP, then MOCP would not change. TheMOCP in this example is 35 amps, the MCA New is below 35, therefore the MOCP is accept-able. If “MCA New” is larger than the published MOCP, raise the MOCP to the next largersize. For separate power, the MOCP for the power exhaust will be 15 amps per NEC.
Table 5 — Electrical Data — Standard-Efficiency ASHRAE 90.1 Compliant Cooling Only Units(With Convenience Outlet) (cont)
LEGEND
*Used to determine minimum disconnect per NEC.†Fuse or HACR circuit breaker.**Fuse only.
NOTES:1. In compliance with NEC requirements for multimotor and combination load equipment (refer to
NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACRbreaker. Canadian units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greater than 2%. Use thefollowing formula to determine the percent of voltage imbalance.
% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
= 457
Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.
3. For units with power exhaust: If a single power source is to be used, size wire to includepower exhaust MCA and MOCP. Check MCA and MOCP when power exhaust is poweredthrough the unit (must be in accordance with NEC and/or local codes). Determine the newMCA including the power exhaust using the following formula:MCA New = MCA unit only + MCA of Power ExhaustFor example, using a 5 ton unit with MCA = 28.9 and MOCP = 35, with CRPWREXH030A00power exhaust.MCA New = 28.9 amps + 1.6 amps = 30.5 ampsIf the new MCA does not exceed the published MOCP, then MOCP would not change. TheMOCP in this example is 35 amps, the MCA New is below 35, therefore the MOCP is accept-able. If “MCA New” is larger than the published MOCP, raise the MOCP to the next largersize. For separate power, the MOCP for the power exhaust will be 15 amps per NEC.
Table 6 — Electric Heating Usage — Standard-Efficiency ASHRAE 90.1 Compliant Cooling Only Units
*Two heater packages required to provide kW indicated.†004 on units with convenience outlet.**002 on high-static units.
NOTES:1. The rated heater voltage is 240, 480, and 575 v. If power distribution voltage varies from rated heater voltage, heater kW will vary accordingly.2. To determine heater kW at voltages other than those shown in table, use the following formula:
Heater kWnew = Heater kW rated x (unit power distribution voltage/rated heater voltage)2
As an example:For a 16 kW heater rated at 240 v with a power distribution voltage of 215 vkWnew = 16 kW (215/240)2
Table 7 — Electrical Data — Standard-Efficiency Cooling Only Units(Without Convenience Outlet) (cont)
LEGEND
*Used to determine minimum disconnect per NEC.†Fuse or HACR circuit breaker.**Fuse only.
NOTES:1. In compliance with NEC requirements for multimotor and combination load equipment (refer to
NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACRbreaker. Canadian units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greater than 2%. Use thefollowing formula to determine the percent of voltage imbalance.
% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
= 457Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.
3. For units with power exhaust: If a single power source is to be used, size wire to includepower exhaust MCA and MOCP. Check MCA and MOCP when power exhaust is poweredthrough the unit (must be in accordance with NEC and/or local codes). Determine the newMCA including the power exhaust using the following formula:MCA New = MCA unit only + MCA of Power ExhaustFor example, using a 5 ton unit with MCA = 28.9 and MOCP = 35, with CRPWREXH030A00power exhaust.MCA New = 28.9 amps + 1.6 amps = 30.5 ampsIf the new MCA does not exceed the published MOCP, then MOCP would not change. TheMOCP in this example is 35 amps, the MCA New is below 35, therefore the MOCP is accept-able. If “MCA New” is larger than the published MOCP, raise the MOCP to the next largersize. For separate power, the MOCP for the power exhaust will be 15 amps per NEC.
Table 7 — Electrical Data — Standard-Efficiency Cooling Only Units(Without Convenience Outlet) (cont)
LEGEND
*Used to determine minimum disconnect per NEC.†Fuse or HACR circuit breaker.**Fuse only.NOTES:1. In compliance with NEC requirements for multimotor and combination load equipment (refer to
NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACRbreaker. Canadian units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greater than 2%. Use the fol-lowing formula to determine the percent of voltage imbalance.% Voltage Imbalance
Example: Supply voltage is 460-3-60.AB = 452 vBC = 464 vAC = 455 v
= 457Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.
3. For units with power exhaust: If a single power source is to be used, size wire to include powerexhaust MCA and MOCP. Check MCA and MOCP when power exhaust is powered through theunit (must be in accordance with NEC and/or local codes). Determine the new MCA includingthe power exhaust using the following formula:MCA New = MCA unit only + MCA of Power ExhaustFor example, using a 71/2 ton unit with MCA = 28.9 and MOCP = 35, with CRPWREXH030A00power exhaust.MCA New = 28.9 amps + 1.6 amps = 30.5 ampsIf the new MCA does not exceed the published MOCP, then MOCP would not change. TheMOCP in this example is 35 amps, the MCA New is below 35, therefore the MOCP is accept-able. If “MCA New” is larger than the published MOCP, raise the MOCP to the next larger size.For separate power, the MOCP for the power exhaust will be 15 amps per NEC.
UNITSIZE
NOMINALV-Ph-Hz
IFMTYPE
ELECTRIC HEAT POWER SUPPLY DISCONNECT SIZE†Nominal
Table 8 — Electrical Data — Standard-Efficiency Cooling Only Units(With Convenience Outlet) (cont)
LEGEND
*Used to determine minimum disconnect per NEC.†Fuse or HACR circuit breaker.**Fuse only.
NOTES:1. In compliance with NEC requirements for multimotor and combination load equipment (refer to
NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACRbreaker. Canadian units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greater than 2%. Use thefollowing formula to determine the percent of voltage imbalance.
% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
= 457Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.Determine percent of voltage imbalance.
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.
3. For units with power exhaust: If a single power source is to be used, size wire to includepower exhaust MCA and MOCP. Check MCA and MOCP when power exhaust is poweredthrough the unit (must be in accordance with NEC and/or local codes). Determine the newMCA including the power exhaust using the following formula:MCA New = MCA unit only + MCA of Power ExhaustFor example, using a 5 ton unit with MCA = 28.9 and MOCP = 35, with CRPWREXH030A00power exhaust.MCA New = 28.9 amps + 1.6 amps = 30.5 ampsIf the new MCA does not exceed the published MOCP, then MOCP would not change. TheMOCP in this example is 35 amps, the MCA New is below 35, therefore the MOCP is accept-able. If “MCA New” is larger than the published MOCP, raise the MOCP to the next largersize. For separate power, the MOCP for the power exhaust will be 15 amps per NEC.
Table 8 — Electrical Data — Standard-Efficiency Cooling Only Units(With Convenience Outlet) (cont)
LEGEND
*Used to determine minimum disconnect per NEC.†Fuse or HACR circuit breaker.**Fuse only.
NOTES:1. In compliance with NEC requirements for multimotor and combination load equipment
(refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shallbe fuse or HACR breaker. Canadian units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greater than 2%.Use the following formula to determine the percent of voltage imbalance.
% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
= 457Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allowable2%.
3. For units with power exhaust: If a single power source is to be used, size wire toinclude power exhaust MCA and MOCP. Check MCA and MOCP when powerexhaust is powered through the unit (must be in accordance with NEC and/or localcodes). Determine the new MCA including the power exhaust using the following for-mula:MCA New = MCA unit only + MCA of Power ExhaustFor example, using a 71/2 ton unit with MCA = 28.9 and MOCP = 35, withCRPWREXH030A00 power exhaust.MCA New = 28.9 amps + 1.6 amps = 30.5 ampsIf the new MCA does not exceed the published MOCP, then MOCP would notchange. The MOCP in this example is 35 amps, the MCA New is below 35, thereforethe MOCP is acceptable. If “MCA New” is larger than the published MOCP, raise theMOCP to the next larger size. For separate power, the MOCP for the power exhaustwill be 15 amps per NEC.
Table 8 — Electrical Data — Standard-Efficiency Cooling Only Units(With Convenience Outlet) (cont)
LEGEND
*Used to determine minimum disconnect per NEC.†Fuse or HACR circuit breaker.**Fuse only.
NOTES:1. In compliance with NEC requirements for multimotor and combination load equipment
(refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shallbe fuse or HACR breaker. Canadian units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greater than 2%.Use the following formula to determine the percent of voltage imbalance.
% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
= 457Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allowable2%.
3. For units with power exhaust: If a single power source is to be used, size wire toinclude power exhaust MCA and MOCP. Check MCA and MOCP when powerexhaust is powered through the unit (must be in accordance with NEC and/or localcodes). Determine the new MCA including the power exhaust using the following for-mula:MCA New = MCA unit only + MCA of Power ExhaustFor example, using a 71/2 ton unit with MCA = 28.9 and MOCP = 35, withCRPWREXH030A00 power exhaust.MCA New = 28.9 amps + 1.6 amps = 30.5 ampsIf the new MCA does not exceed the published MOCP, then MOCP would notchange. The MOCP in this example is 35 amps, the MCA New is below 35, thereforethe MOCP is acceptable. If “MCA New” is larger than the published MOCP, raise theMOCP to the next larger size. For separate power, the MOCP for the power exhaustwill be 15 amps per NEC.
Table 9 — Electric Heating Usage — Standard-Efficiency Cooling Only Units
*Two heater packages required to provide kW indicated.†004 on units with convenience outlet.**002 on units with convenience outlet.
NOTES:1. The rated heater voltage is 240, 480, and 575 v. If power distribution voltage varies from rated heater voltage, heater kW will vary accordingly.2. To determine heater kW at voltages other than those shown in table, use the following formula:
Heater kWnew = Heater kW rated x (unit power distribution voltage/rated heater voltage)2
As an example:For a 16 kW heater rated at 240 v with a power distribution voltage of 215 vkWnew = 16 kW (215/240)2
Table 11 — Electrical Data — High-Efficiency Heat Pump Units — High-Static Motor Units(Without Electrical Convenience Outlet)
LEGEND
*Heater capacity (kW) is based on heater voltage of 208 v, 240 v, or 480 v. If power distri-bution voltage to unit varies from rated heater voltage, heater kW will vary accordingly.
†Heaters are field installed only.**Fuse or HACR circuit breaker.
††Electrical disconnect cannot be used if electric heater is installed.
NOTES:1. In compliance with NEC requirements for multimotor and combination load equip-
ment (refer to NEC Articles 430 and 440), the overcurrent protective device for theunit shall be fuse or HACR breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greater than2%. Use the following formula to determine the percentage of voltage imbalance.% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
= 457Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allowable2%.
Table 13 — Electrical Data — High-Efficiency Heat Pump Units — High-Static Motor Units(With Electrical Convenience Outlet)
LEGEND
*Heater capacity (kW) is based on heater voltage of 208 v, 240 v, or 480 v. If power distri-bution voltage to unit varies from rated heater voltage, heater kW will vary accordingly.
†Heaters are field installed only.**Fuse or HACR circuit breaker.
††Electrical disconnect cannot be used if electric heater is installed.
NOTES:1. In compliance with NEC requirements for multimotor and combination load equip-
ment (refer to NEC Articles 430 and 440), the overcurrent protective device for theunit shall be fuse or HACR breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greater than2%. Use the following formula to determine the percentage of voltage imbalance.% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
= 457Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allowable2%.
FLA — Full Load AmpsHACR — Heating, Air Conditioning and RefrigerationLRA — Locked Rotor AmpsMCA — Minimum Circuit AmpsMOCP — Maximum Overcurrent ProtectionNEC — National Electrical Code
= 100 xmax voltage deviation from average voltage
average voltage
Average Voltage =452 + 464 + 455
3
=1371
3
IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your localelectric utility company immediately.
7457
42
Table 14 — Electric Heater Usage — High-Efficiency Heat Pump Units
*Two heater packages required to provide kW indicated.NOTES:
1. The rated heater voltage is 240 and 480 v. If power distribution voltage varies from rated heater voltage, heater kW will vary accordingly.2. To determine heater kW at voltages other than those shown in table, use the following formula:
Heater kWnew = Heater kW rated x (unit power distribution voltage/rated heater voltage)2
As an example:For a 16 kW heater rated at 240 v with a power distribution voltage of 215 vkWnew = 16 kW (215/240)2
*Heaters are field installed only.†Used to determine minimum disconnect size per NEC.**Heater capacity (kW) is based on heater voltage of 208 v, 240 v and 480 v. If power dis-
tribution voltage to unit varies from rated heater voltage, heater kW will vary accord-ingly.
††Fuse or HACR circuit breaker.***Optional disconnect switch is unavailable.NOTES:1. In compliance with NEC requirements for multimotor and combination load equipment
(refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shallbe fuse or HACR breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greater than 2%.Use the following formula to determine the percent of voltage imbalance.% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allowable2%.
*Heaters are field installed only.†Used to determine minimum disconnect size per NEC.**Heater capacity (kW) is based on heater voltage of 208 v, 240 v and 480 v.
If power distribution voltage to unit varies from rated heater voltage, heaterkW will vary accordingly.
††Fuse or HACR circuit breaker.***Optional disconnect switch is unavailable.
NOTES:1. In compliance with NEC requirements for multimotor and combination load
equipment (refer to NEC Articles 430 and 440), the overcurrent protectivedevice for the unit shall be fuse or HACR breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage isgreater than 2%. Use the following formula to determine the percent of volt-age imbalance.% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximumallowable 2%.
*Heaters are field installed only.†Used to determine minimum disconnect size per NEC.**Heater capacity (kW) is based on heater voltage of 208 v, 240 v and 480 v.
If power distribution voltage to unit varies from rated heater voltage, heaterkW will vary accordingly.
††Fuse or HACR circuit breaker.***Optional disconnect switch is unavailable.
NOTES:1. In compliance with NEC requirements for multimotor and combination load
equipment (refer to NEC Articles 430 and 440), the overcurrent protectivedevice for the unit shall be fuse or HACR breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage isgreater than 2%. Use the following formula to determine the percent of volt-age imbalance.% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximumallowable 2%.
Table 16 — Electrical Data — Standard-Efficiency Heat Pump Units (With Convenience Outlet) (cont)
LEGEND
*Heaters are field installed only.†Used to determine minimum disconnect size per NEC.**Heater capacity (kW) is based on heater voltage of 208 v, 240 v and 480 v.
If power distribution voltage to unit varies from rated heater voltage, heaterkW will vary accordingly.
††Fuse or HACR circuit breaker.***Optional disconnect switch is unavailable.
NOTES:1. In compliance with NEC requirements for multimotor and combination load
equipment (refer to NEC Articles 430 and 440), the overcurrent protectivedevice for the unit shall be fuse or HACR breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage isgreater than 2%. Use the following formula to determine the percent of volt-age imbalance.% Voltage Imbalance
Example: Supply voltage is 460-3-60.AB = 452 vBC = 464 vAC = 455 v
Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximumallowable 2%.
Table 16 — Electrical Data — Standard-Efficiency Heat Pump Units (With Convenience Outlet) (cont)
LEGEND
*Heaters are field installed only.†Used to determine minimum disconnect size per NEC.**Heater capacity (kW) is based on heater voltage of 208 v, 240 v and 480 v.
If power distribution voltage to unit varies from rated heater voltage, heaterkW will vary accordingly.
††Fuse or HACR circuit breaker.***Optional disconnect switch is unavailable.
NOTES:1. In compliance with NEC requirements for multimotor and combination load
equipment (refer to NEC Articles 430 and 440), the overcurrent protectivedevice for the unit shall be fuse or HACR breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage isgreater than 2%. Use the following formula to determine the percent of volt-age imbalance.% Voltage Imbalance
Example: Supply voltage is 460-3-60.AB = 452 vBC = 464 vAC = 455 v
Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximumallowable 2%.
Table 17 — Electric Heater Usage — Standard-Efficiency Heat Pump Units
*Two heater packages required to provide kW indicated.†Use CRSINGLE004A00 for units with convenience outlet.**Use CRSINGLE005A00 for units with convenience outlet.
††Use CRSINGLE002A00 for units with convenience outlet.***Use CRSINGLE002A00 for units with high-static motor and convenience outlet.
†††Use CRSINGLE008A00 for units with an electrical convenience outlet.NOTES:1. The rated heater voltage is 240, 480, and 575 v. If power distribution voltage varies from rated heater voltage, heater kW will vary accordingly.2. To determine heater kW at voltages other than those shown in table, use the following formula:
Heater kW new = Heater kW rated x (unit power distribution voltage/rated heater voltage)2
As an example:For a 16 kW heater rated at 240 v with a power distribution voltage of 215 vkW new = 16 kW (215/240)2
Table 18 — Electrical Data (COBRA™ Energy Recovery Unit 50HJ004-007 Units with 62AQ060) (cont)
LEGEND
*Used to determine minimum disconnect per NEC.
NOTES:1. In compliance with NEC requirements for multimotor and combination load
equipment (refer to NEC Articles 430 and 440), the overcurrent protective devicefor the unit shall be fuse or HACR breaker. UL, Canada units may be fuse or cir-cuit breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greaterthan 2%. Use the following formula to determine the percent of voltageimbalance.
Example: Supply voltage is 460-3-60.AB = 452 vBC = 464 vAC = 455 v
= 457Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allow-able 2%.
FLA — Full Load AmpsHACR — Heating, Air Conditioning and RefrigerationIFM — Indoor (Evaporator) Fan MotorLRA — Locked Rotor AmpsMCA — Minimum Circuit AmpsMOCP — Maximum Overcurrent ProtectionNEC — National Electrical CodeUL — Underwriters’ Laboratories
= 100 x max voltage deviation from average voltageaverage voltage
Average Voltage =452 + 464 + 455
3
=1371
3
IMPORTANT: If the supply voltage phase imbalance is more than 2%, contactyour local electric utility company immediately.
7457
60
Table 18 — Electrical Data (COBRA™ Energy Recovery Unit 50HJ004-007 Units with 62AQ060) (cont)
LEGEND
*Used to determine minimum disconnect per NEC.
NOTES:1. In compliance with NEC requirements for multimotor and combination load
equipment (refer to NEC Articles 430 and 440), the overcurrent protective devicefor the unit shall be fuse or HACR breaker. UL, Canada units may be fuse or cir-cuit breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greaterthan 2%. Use the following formula to determine the percent of voltageimbalance.
Example: Supply voltage is 460-3-60.AB = 452 vBC = 464 vAC = 455 v
= 457Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allow-able 2%.
FLA — Full Load AmpsHACR — Heating, Air Conditioning and RefrigerationIFM — Indoor (Evaporator) Fan MotorLRA — Locked Rotor AmpsMCA — Minimum Circuit AmpsMOCP — Maximum Overcurrent ProtectionNEC — National Electrical CodeUL — Underwriters’ Laboratories
= 100 x max voltage deviation from average voltageaverage voltage
Average Voltage =452 + 464 + 455
3
=1371
3
IMPORTANT: If the supply voltage phase imbalance is more than 2%, contactyour local electric utility company immediately.
7457
61
Table 19 — Electric Heater Usage — COBRA™ Energy Recovery Unit 50HJ004-007 Units with 62AQ060
*Two heater packages required to provide kW indicated.†005 on units with convenience outlet.
**003 on high-static units with convenience outlet.††025 on units with convenience outlet.
NOTES:1. The rated heater voltage is 240 and 480 v. If power distribution voltage varies from rated heater voltage, heater kW will vary accordingly.2. To determine heater kW at voltages other than those shown in table, use the following formula:
Heater kWnew = Heater kW rated x (unit power distribution voltage/rated heater voltage)2
As an example:For a 16 kW heater rated at 240 v with a power distribution voltage of 215 vkWnew = 16 kW (215/240)2
Table 20 — Electrical Data (COBRA™ Energy Recovery Unit 50HJ004-007 Units with 62AQ100) (cont)
LEGEND
*Used to determine minimum disconnect per NEC.
NOTES:1. In compliance with NEC requirements for multimotor and combination load
equipment (refer to NEC Articles 430 and 440), the overcurrent protective devicefor the unit shall be fuse or HACR breaker. UL, Canada units may be fuse or cir-cuit breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greaterthan 2%. Use the following formula to determine the percent of voltageimbalance.
Example: Supply voltage is 460-3-60.AB = 452 vBC = 464 vAC = 455 v
= 457Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allow-able 2%.
FLA — Full Load AmpsHACR — Heating, Air Conditioning and RefrigerationIFM — Indoor (Evaporator) Fan MotorLRA — Locked Rotor AmpsMCA — Minimum Circuit AmpsMOCP — Maximum Overcurrent ProtectionNEC — National Electrical CodeUL — Underwriters’ Laboratories
= 100 x max voltage deviation from average voltageaverage voltage
Average Voltage =452 + 464 + 455
3
=1371
3
IMPORTANT: If the supply voltage phase imbalance is more than 2%, contactyour local electric utility company immediately.
7457
64
Table 20 — Electrical Data (COBRA™ Energy Recovery Unit 50HJ004-007 Units with 62AQ100) (cont)
LEGEND
*Used to determine minimum disconnect per NEC.
NOTES:1. In compliance with NEC requirements for multimotor and combination load
equipment (refer to NEC Articles 430 and 440), the overcurrent protective devicefor the unit shall be fuse or HACR breaker. UL, Canada units may be fuse or cir-cuit breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greaterthan 2%. Use the following formula to determine the percent of voltageimbalance.
Example: Supply voltage is 460-3-60.AB = 452 vBC = 464 vAC = 455 v
= 457Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allow-able 2%.
FLA — Full Load AmpsHACR — Heating, Air Conditioning and RefrigerationIFM — Indoor (Evaporator) Fan MotorLRA — Locked Rotor AmpsMCA — Minimum Circuit AmpsMOCP — Maximum Overcurrent ProtectionNEC — National Electrical CodeUL — Underwriters’ Laboratories
= 100 xmax voltage deviation from average voltage
average voltage
Average Voltage =452 + 464 + 455
3
=1371
3
IMPORTANT: If the supply voltage phase imbalance is more than 2%, contactyour local electric utility company immediately.
7457
65
Table 21 — Electric Heater Usage — COBRA™ Energy Recovery Units 50HJ004-007 with 62AQ100
*Two heater packages required to provide kW indicated.†002 on units with convenience outlet.
**003 on high-static units with convenience outlet.††004 on units with convenience outlet.
NOTES:1. The rated heater voltage is 240 and 480 v. If power distribution voltage varies from rated heater voltage, heater kW will vary accordingly.2. To determine heater kW at voltages other than those shown in table, use the following formula:
Heater kWnew = Heater kW rated x (unit power distribution voltage/rated heater voltage)2
As an example:For a 16 kW heater rated at 240 v with a power distribution voltage of 215 vkWnew = 16 kW (215/240)2
Table 22 — Electrical Data (COBRA™ Energy Recovery Units 50HJ008-014 with 62AQ200) (cont)
LEGEND
*Used to determine minimum disconnect per NEC.
NOTES:1. In compliance with NEC requirements for multimotor and combination load equipment
(refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shallbe fuse or HACR breaker. UL, Canada units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greater than 2%.Use the following formula to determine the percent of voltage imbalance.
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
= 457Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.
FLA — Full Load AmpsHACR — Heating, Air Conditioning and RefrigerationIFM — Indoor (Evaporator) Fan MotorLRA — Locked Rotor AmpsMCA — Minimum Circuit AmpsMOCP — Maximum Overcurrent ProtectionNEC — National Electrical CodeUL — Underwriters’ Laboratories
= 100 xmax voltage deviation from average voltage
average voltage
Average Voltage =452 + 464 + 455
3
=1371
3
IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact yourlocal electric utility company immediately.
7457
68
Table 23 — Electric Heater Usage — COBRA™ Energy Recovery Units 50HJ008-014 with 62AQ200
*009 on units with convenience outlet or high-static motor.†008 on high-static units with convenience outlet.
**015 on units with convenience outlet or high-static motor.††014 on high-static units with convenience outlet.***Part of base unit.NOTES:
1. The rated heater voltage is 240 and 480 v. If power distribution voltage varies from rated heater voltage, heater kW vary accordingly.2. To determine heater kW at voltages other than those shown in table, use the following formula:
Heater kW new = Heater kW rated x (unit power distribution voltage / rated heater voltage) 2As an example:For a 16 kW heater rated at 240 v with a power distribution voltage of 215 vkW new = 16 kW (215/240) 2kW new = 12.8 kW (rating at 215 v)
Table 24 — Electrical Data (COBRA™ Energy Recovery Units 50HJ008-014 with 62AQ300) (cont)
LEGEND
*Used to determine minimum disconnect per NEC.
NOTES:1. In compliance with NEC requirements for multimotor and combination load equipment
(refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shallbe fuse or HACR breaker. UL, Canada units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greater than 2%.Use the following formula to determine the percent of voltage imbalance.
Example: Supply voltage is 460-3-60.
AB = 452 vBC = 464 vAC = 455 v
= 457
Determine maximum deviation from average voltage.(AB) 457 – 452 = 5 v(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v
Maximum deviation is 7 v.Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.
FLA — Full Load AmpsHACR — Heating, Air Conditioning and RefrigerationIFM — Indoor (Evaporator) Fan MotorLRA — Locked Rotor AmpsMCA — Minimum Circuit AmpsMOCP — Maximum Overcurrent ProtectionNEC — National Electrical CodeUL — Underwriters’ Laboratories
= 100 xmax voltage deviation from average voltage
average voltage
Average Voltage =452 + 464 + 455
3
=1371
3
IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact yourlocal electric utility company immediately.
7457
71
Table 25 — Electric Heater Usage — COBRA™ Energy Recovery Units 50HJ008-014 with 62AQ300
*009 on units with convenience outlet or high-static motor.†015 on units with convenience outlet or high-static motor.
**Single point box is part of base unit.NOTES:
1. The rated heater voltage is 240 and 480 v. If power distribution voltage varies from rated heater voltage, heater kW vary accordingly.2. To determine heater kW at voltages other than those shown in table, use the following formula:
Heater kW new = Heater kW rated x (unit power distribution voltage / rated heater voltage) 2As an example:For a 16 kW heater rated at 240 v with a power distribution voltage of 215 vkW new = 16 kW (215/240) 2kW new = 12.8 kW (rating at 215 v)
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 111 Catalog No. 535-00028 Printed in U.S.A. Form 50-8SI Pg 72 3-03 Replaces: 50-4SI
Copyright 2003 Carrier Corporation
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HEAT PUMP UNITS — 2-MODULE HEAT OPTIONS ELECTRIC COOLING UNITS — 2-MODULE HEAT OPTIONS