Single-Duct SD 1 VAV-PRC008-EN Table of Contents Service Model Number Description SD 2 – 3 Selection Procedure SD 4 – 5 General Data – Valve/Controller Airflow Guidelines SD 6 Performance Data – Air Pressure Requirements SD 7 – 9 Performance Data – Hot Water Coil SD 10 – 15 Performance Data – Electric Data SD 16 – 17 Performance Data – Acoustics SD 18 – 21 Dimensional Data SD 22 – 27 Mechanical Specifications SD 28 – 30
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Single-Duct Table of Contents · 2006-05-22 · Single-Duct VAV-PRC008-EN SD 1 Table of Contents Service Model Number Description SD 2 – 3 Selection Procedure SD 4 – 5 General
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Single-Duct
SD 1VAV-PRC008-EN
Table ofContents
Service Model Number Description SD 2 – 3
Selection Procedure SD 4 – 5
General Data – Valve/Controller Airflow Guidelines SD 6
Performance Data – Air Pressure Requirements SD 7 – 9
Performance Data – Hot Water Coil SD 10 – 15
Performance Data – Electric Data SD 16 – 17
Performance Data – Acoustics SD 18 – 21
Dimensional Data SD 22 – 27
Mechanical Specifications SD 28 – 30
Single-Duct
VAV-PRC008-ENSD 2
ServiceModel NumberDescription
Single-Duct VAVTerminal UnitsThe features of the single-duct VAVterminal units are described by theproduct categories shown in bold.Within each category the availableoptions are listed.
Digit 1, 2—Unit TypeVC VariTrane single-duct
Digit 3—ReheatC Cooling OnlyE Electric HeatW Hot Water Heat
Note: See unit drawings for outlet sizes/damper information.
Digit 20—Not Used0 N/A
Digit 21—Water Coil0 None1 1-Row2 2-Row
Digit 22—Electrical Connections (VCCF,VCWF can be flipped in the field toachieve opposite-hand connection)L Left (Airflow hitting you in the
face)R Right (Airflow hitting you in the
face)0 Opposite side connection – coil
and control
Digit 23—Transformer0 None1 120/24 volt (50 VA)2 208/24 volt (50 VA)3 240/24 volt (50 VA)4 277/24 volt (50 VA)5 480/24 volt (50 VA)6 347/24 Volt (50 VA)7 575/24 Volt (50 VA)8 380/24 Volt (50 VA)
Note: For VCEF units with transformersthe VA depends on the staging, control,and contactor type (ranges are 40 VAto 75 VA)
Digit 24—Disconnect Switch0 NoneW With
Note: VCCF, VCWF – Toggle DisconnectVCEF – Door Interlocking PowerDisconnect
This section describes the catalogselection of single-duct VAV terminalunits with specific examples. Acomputer selection program is alsoavailable to aid in selection of VAVterminal units.
Selection of single-duct VAV terminalunits can involve three elements:
• Air valve selection• Heating coil selection (if required)• Acoustics
Air Valve Selection
The wide-open static pressure andairflows are found in the performancedata section of the catalog. To select anair valve, locate the required designcooling airflow for your terminal unittype and find the smallest air valve sizethat has a pressure drop equal to orlower than the maximum wide-openstatic pressure requirement.
From the performance data charts,select a valve size 12, which has a wide-open static pressure drop of 0.01 in. wg
Check the minimum and maximum cfmdesired with the minimum andmaximum cfm allowed in the table inthe general data section. The maximumsetting of 1700 cfm is within theacceptable range. The desired minimumsetting of 850 cfm is acceptable for thecooling only box desired. Note that if anelectric reheat box was selected, theminimum cfm would be dependentupon the kW of the electric heater. (SeeElectric Heat Unit Selection.)
Heating Coil Selection (Ifrequired)First, determine the amount of heatrequired to meet space anddownstream duct heat losses from aload calculation.
Hot Water HeatSelect a hot water coil sufficient to meetthe design heat loss.
Example:VCWF, Hot Water Unit Heat, Size 12(See air Valve Selection)Heating airflow: 850 cfmHot water flow: 1.0 gpmDesign Heat Loss: Q =25 MBh
Select hot water coil from the coilperformance table in the PerformanceData section of the catalog.
Selection:A one-row coil is sufficient to meetdesign conditions. From the Hot WaterCoil Capacity Data of the PerformanceData Section, a one-row coil for a size12 air valve will operate at the aboveconditions as follows:
Coil Capacity: 25.17 MBhWater pressure drop: 0.72 ft WPD
Air pressure drop (APD) of the hotwater coil is included in the chartpreceding the hot water coilperformance data section.
APD = 0.35 in. wg
Electric HeatDetermine the kW required to meetzone design heat loss.
kW = MBh / 3.414
MBh = Design Heat Loss
Select the nearest available kW withvoltage and steps desired from theelectric heater kW guideline table in thePerformance Data section of thecatalog.
Example:VCEF, Electric Unit Heat, Size 12(See Air Valve Selection)Heating airflow: 850 cfmVoltage: 277/60/1 VACDesign Heat Loss: Q = 25 MBh
kW = Q/3.414
kW = 25/3.414
kW = 7.3
Selection:Select 7.5 kW from the electric heattable in the voltage and stagesrequired. The table shows theminimum cfm allowable for the kWselected. The static pressurerequirement is shown as 0.06 in. wgfor this example with a design coolingflow of 1700 cfm.
Check Leaving Air Temperature:
T is the primary entering airtemperature 55°F for this example.
Decide if leaving air temperature of82.8°F is satisfactory for yourapplication.
AcousticsThe acoustical data found in the"Performance Data" section of the VAVcatalog is used to make adetermination of the amount of noisethe terminal unit will generate. Locatethe table for the VAV terminal unit ofinterest. Sound power data and anequivalent NC level for an ARI 885-98transfer function is listed.
Example:VCCF, Cooling-Only Terminal Unit, Size10 (See air Valve Selection)Cooling Airflow: 1100 cfm
Maximum inlet staticpressure: 1.5 in. wg
Interpolation gives sound powerdata of:
LAT = 3414 x 7.51.085 x 850
+ 55 = 82.8
LAT = Q1.085 x CFM
+ T
The maximum NC level is NC-37. If themaximum NC level was exceeded, itwould have been necessary to reselectthe next larger unit size.
Computer SelectionThe advent of personal computers hasserved to automate many processesthat were previously repetitive andtime-consuming. One of those tasks isthe proper scheduling, sizing, andselection of VAV terminal units. Tranehas developed a computer program toperform these tasks. The software iscalled the Trane Official ProductSelection System (TOPSS).
The TOPSS program will take the inputspecifications and output the properlysized VariTrane VAV terminal unit alongwith the specific performance for thatsize unit.
The program has several requiredfields, denoted by red shading in theTOPSS screen, and many otheroptional fields to meet the criteria youhave. Required values includemaximum and minimum airflows,control type, and model. If selectingmodels with reheat, you will berequired to enter information to make
The NC level above is determined byusing either the catalog’s ARI 885-98(mineral fiber for radiated sound)transfer function for the conditionsshown in the acoustics table. Adifferent transfer function could beapplied as conditions dictate.
Rearrange what fields you seeand in what order with a fewclicks of a button.
Required entry fields (in Redon TOPSS screen).
that selection also. The user is giventhe option to look at all the informationfor one selection on one screen or as aschedule with the other VAV units onthe job.
The user can select single-duct, dual-duct, and fan-powered VAV boxes withthe program, as well as most otherTrane products, allowing you to selectall your Trane equipment with onesoftware program.
The program will also calculate soundpower data for the selected terminalunit. The user can enter a maximumindividual sound level for each octaveband or a maximum NC value. Theprogram will calculate acoustical datasubject to default or user suppliedsound attenuation data.
Schedule ViewThe program has many time-saving features such as:
• Copy/Paste from spreadsheets like Microsoft® Excel• Easily arranged fields to match your schedule• Time-saving templates to store default settings
The user can also export the Schedule View to Excel to modify and put into a CADdrawing as a schedule.
Specific details regarding the program, its operation, and how to obtain a copy of itare available from your local Trane sales office.
Single-Duct
VAV-PRC008-ENSD 6
General Data—Valve/ControllerAirflow Guidelines
Note: Maximum airflow must be greater than or equal to minimum airflow.
Primary Airflow Control Factory Settings – I-PControl Air Valve Maximum Valve Maximum Controller Minimum Controller Constant Volume
Note: Hot water pressure drops are for the entire unit, not just the coil. To calculate the hot water coil only pressure drop, subtract the cooling only pressure drop from theother pressure drop.
Air Pressure Drop – in. wg (I-P)Inlet Airflow Cooling Hot Water ElectricSize Cfm Only 1-row coil 2-row coil Heat
LAT = EAT + MBH x 921.7 Cfm( ) WTD = EWT - LWT = 2 x MBH
Gpm( )
Notes:1. Fouling Factor = 0.000252. Capacity based on 55°F entering air temperature and 180°F entering water temperature. Refer to correction factors for different
entering conditions on page 42.3. The following equations may be used in calculating Leaving Air Temperature (LAT) and Water Temperature Difference (WTD).
Notes:1. Fouling Factor = 0.0005 °F ft² h/Btu.2. Capacity based on 55°F entering air temperature and 180°F entering water temperature. Refer to correction factors found on page 42
for different entering conditions.3. The following equations may be used in calculating Leaving Air Temperature (LAT) and Water Temperature Difference (WTD).
PerformanceData—Hot WaterCoil (I-P)
LAT = EAT + MBH x 921.7 Cfm( ) WTD = EWT - LWT = 2 x MBH
Notes:1. Fouling Factor = 0.0005 °F ft² h/Btu.2. Capacity based on 55°F entering air temperature and 180°F entering water temperature. Refer to correction factors found on page 42
for different entering conditions.3. The following equations may be used in calculating Leaving Air Temperature (LAT) and Water Temperature Difference (WTD).
Notes:1. Fouling Factor = 0.0005.2. Capacity based on 12°C entering air temperature and 82°C entering water temperature. Refer to correction factors for different
entering conditions on page 45.3. The following equations may be used in calculating Leaving Air Temperature (LAT) and Water Temperature Difference (WTD).
Notes:1. Fouling Factor = 0.0005.2. Capacity based on 12°C entering air temperature and 82°C entering water temperature.
Single-Duct
VAV-PRC008-ENSD 14
PerformanceData—Hot WaterCoil (SI)
Notes:1. Fouling Factor = 0.0005.2. Capacity based on 12°C entering air temperature and 82°C entering water temperature. Refer to correction factors for different
entering conditions on page 45.3. The following equations may be used in calculating Leaving Air Temperature (LAT) and Water Temperature Difference (WTD).
Notes:1. Fouling Factor = 0.0005.2. Capacity based on 12°C entering air temperature and 82°C entering water temperature.
Notes:1. Fouling Factor = 0.0005.2. Capacity based on 12°C entering air temperature and 82°C entering water temperature.
Single-Duct
SD 15VAV-PRC008-EN
PerformanceData—Hot WaterCoil (SI)
Temperature Correction Factors for Water Pressure Drop (kPa)
Average Water Temperature 93 88 82 77 71 66 60 54 49 43Correction Factor 0.970 0.985 1.000 1.020 1.030 1.050 1.080 1.100 1.130 1.150
Temperature Correction Factors for Coil Capacity (kW)
Entering Water Minus Entering Air 22 28 33 39 44 56 69 78 83 89 100 111Correction Factor 0.32 0.40 0.48 0.56 0.64 0.80 1.00 1.12 1.20 1.29 1.45 1.61
LAT = EAT + kW x 0.83 L/s( ) WTD = EWT - LWT = kW
(4.19) L/s)(
Notes:1. Fouling Factor = 0.0005.2. Capacity based on 12°C entering air temperature and 82°C entering water temperature. Refer to correction factors for different
entering conditions on page 45.3. The following equations may be used in calculating Leaving Air Temperature (LAT) and Water Temperature Difference (WTD).
Maximum Overcurrent Protection (MOP) Equation— MOP = heater amps— However since MOP ≤ MCA, then choose next fuse greater than MCA.— Units without electric reheat would use smallest fuse sizing.— Standard Fuse Sizes: 15, 20, 25, 30, 35, 40, 45, 50, and 60.
Example–For MOP of Single-Duct UnitA model VCEF, electric reheat unit size 14 has 480/3 phase 15 kW electric reheat with 2 stages.15 kW – 480/3 heater 15 x 1000 = 18.06
480 x 1.73MCA = 18.06 x 1.25 = 22.58 amps. Since MOP ≤ MCA, then MOP = 25.
kW = 1214 x L/s x ATD
1φamps = kW x 1000Primary Voltage
ATD = kW x 3145Cfm
3145Cfm x ATDkW =
3φamps =kW x 1000
Primary Voltage x √ 3
1214 x L/sATD = kW
Useful formulas:
VCEF Electric Coil kW Guidelines – Minimum to MaximumInlet Single-Phase Voltage Three-Phase VoltageSize Stages 120V 208V/240V 277V 347V 480V 208V 480V 575V 380V/50 Hz
* 36.0 not availableNotes:1. Coils available with 24-volt magnetic or mercury contactors, load carrying P.E switches, and P.E. switch with magnetic or mercury contactors.2. Available kW increments are by 0.5 kW from 1.0 to 8.0 kW, by 1.0 kW from 9.0 to 18.0 kW, and by 2.0 kW from 18.0 to 46.0 kW.3. Each stage will be equal in kW output.4. All heaters contain an auto-thermal cutout and a manual-reset cutout.5. The current amp draw for the heater elements is calculated by the formula below.6. The maximum allowable kW is based on the largest kW possible per a voltage and the minimum airflow per an inlet size and kW.
Notes:1. All data are measured in accordance with current Industry Standard ARI 880, version 1998.2. All sound power levels, dB re: 10-12 watts.3. Where ∆Ps is inlet static pressure minus discharge static pressure.
Single-Duct
SD 19VAV-PRC008-EN
PerformanceData—Acoustics
Radiated Sound Power (dB)Radiated Sound Power (dB)
Notes:1. All data are measured in accordance with current Industry Standard ARI 880, version 1998.2. All sound power levels, dB re: 10-12 watts.3. Where ∆Ps is inlet static pressure minus discharge static pressure.
Notes:1. “—” represents NC levels below NC 15.2. NC Values are calculated using current Industry Standard ARI 885, 2002 addendum to revision 1998. Radiated Transfer Function
obtained from Appendix E, Type 2 Mineral Fiber Insulation.3. Where ∆Ps is inlet static pressure minus discharge static pressure.
Sound Noise Criteria (NC)
ARI 885-98 DISCHARGE TRANSFER FUNCTION ASSUMPTIONS:Octave Band
2 3 4 5 6 7
Small Box (< 300 cfm) -24 -28 -39 -53 -59 -40Medium Box (300-700 cfm) -27 -29 -40 -51 -53 -39Large Box (> 700 cfm) -29 -30 -41 -51 -52 -39Note: Add to terminal unit sound power to determine discharge soundpressure in the space.
ARI 885-98 RADIATED TRANSFER FUNCTION ASSUMPTIONS:Octave Band
2 3 4 5 6 7
Type 1 – Glass Fiber -19 -19 -21 -25 -29 -35Type 2 – Mineral Fiber Insulation -18 -19 -20 -26 -31 -36Type 3 – Solid Gypsum Board -23 -26 -25 -27 -27 -28Note: Select the ceiling type which most closely represents theapplication. Next, add to terminal unit sound power to determine radiatedsound pressure in the space.
Notes:1. All sound data rated in accordance with current Industry Standard
ARI 880, version 1998.2. All sound power levels, dB re: 10-12 watts.
Single-Duct
VAV-PRC008-ENSD 22
DimensionalData
NOTES:
1. Air inlet centered in unit front panel.
2. Outlet combinations to remote diffusers have optional integral balancing dampers. (See specification sheet.)
3. Outlet connections are centered in plenum panel.
4. Plenum not available with size 14 & 16 units.
5. Minimum of 1.5 duct diamenters of straight duct required at inlet for proper flow reading.
6. Allow 12" (305 mm) on control side for servicing.
7. Weights are an estimation and will vary based on selected options, insulation type, etc.
8. Unit is field convertible from a left-hand connection (shown) to right-hand by rotating unit.
AIRFLOW
VALVE
AIRFLOW
C
L
D
W
H
BACK VIEW
TOP VIEW
A B C D FE H J
NOMINALØ
5" (127 mm)6" (152 mm)
8" (203 mm)
10" (254 mm)
OUTL CONVERSION CHART
SYMBOL
II
IIIIV
I
OUTLET AVAILABILITY CHART - SEE OUTL CONVERSION FOR NOMINALØ
A,B,C
HOUTL
J
VALV
D,E,F
N/A N/A N/A
IIII, II
4 5
III, IV
6
IV
8 10 12
I, II I, II
I, II I, II I, II I, II, III II, III, IV III, IV
I, II I, II I, IIIN/A I, II
I, II, III II, III, IV III, IV
OUTLET PLENUMARRANGEMENTS
(TOP VIEW)
E
AIR
VALV
04
05
06
08
10
12
14
16
24RT 8000
4000
3000
2000
1400
900
500
350
225
CFM
1416
1888
3776
994
661
425
236
165
106
L/s
14" (356 mm)
16" (406 mm)
24" x 16"
12" (305 mm)
10" (254 mm)
8" (203 mm)
6" (152 mm)
5" (127 mm)
4" (104 mm)
INLET SIZE(NOMINAL Ø)
(610 mm x 406 mm)
5.00" (127 mm)
4.50" (114 mm)
3.50" (89 mm)
5.00" (127 mm)
5.55" (141 mm)
D
9.50" [241 mm]
15.50" [394 mm]
13.50" [343 mm]
H
11.50" [292 mm]
19.50" [495 mm]
11.50" (292 mm)
20.50" (521 mm)
18.50" (470 mm)
12.50" (318 mm)
W
15.50" (394 mm)
24.50" (622 mm)
28.50" (724 mm)
L
18.00" (457 mm)
15.00" (381 mm)
11.50" (292 mm)
11.00" (279 mm)
12.00" (305 mm)
13.00" (330 mm)
14.00" (356 mm)
DISCHARGE DIM W/O OUTLET PLENUM
A (h) B (w)
18.00" (457 mm)
23.00" (584 mm)
27.00" (686 mm)
8.00" (203 mm)
10.00" (254 mm)
12.00" (305 mm)
14.00" (356 mm)
19.00" (483 mm)
17.00" (432 mm)
14.00" (356 mm)
11.00" (279 mm)
9.85" (250 mm)C
SINGLE-DUCT COOLING ONLY WITH OPTIONAL OUTLET PLENUM (VCCF)
21 (9.5)
22 (10)
30 (14)
38 (17)
46 (21)
51 (23)
70 (32)
E
11.50" (292 mm)
14.00" (356 mm)
14.00" (356 mm)
SIZE 04 & 055.75" (146 mm)
4.00"[102mm]
FLOW RINGTUBING
CONTROL BOXANALOG OR DDC/UCM(PNEU. CONTROLS AREA)
6.50"(165 mm)
ACTUATOR
SLIP & DRIVECONNECTION
8.25"(210 mm)
5.50"(140 mm)
NA
NA
NA
DIMENSIONS (BxA)DISCHARGE
(25.4 mm)1.00"
Z
2.25" (57 mm)
2.75" (70 mm)
4.25" (108 mm)
3.25" (83 mm)
2.75" (70 mm)
Z
2.25" (57 mm)5.50" (140 mm)
ARRANGEMENT "H"1.50" (38 mm) FLANGE
WTLBS
(KGS)
Single-Duct
SD 23VAV-PRC008-EN
DimensionalData
WATERCOIL
VALVE
AIRFLOW
C
D
L
H
W
BACK VIEW
TOP VIEW
E
NOMINALØ
5" (127 mm)6" (152 mm)
8" (203 mm)10" (254 mm)
OUTL CONVERSION CHART
SYMBOL
II
IIIIV
I
OUTLET AVAILABILITY CHART - SEE OUTL CONVERSION FOR NOMINALØ
A,B,C
HOUTL
J
VALV
D,E,F
N/A N/A N/A
IIII, II
4 5
III, IV
6
IV
8 10 12
I, II I, II
I, II I, II I, II I, II, III II, III, IV III, IV
I, II I, II I, IIIN/A I, II
I, II, III II, III, IV III, IV
NOTES:
1. Air inlet is centered in unit front panel. 2. Outlet combinations to remote diffusers have optional integral balancing dampers (See specification sheet.)
3. Outlet connections are centerd in plenum panel.
4. Plenum not available with sizes 14 & 16 units.
5. Minimum of 1.5 duct diameters of straight duct required for proper flow reading.
6. Allow 12" (305 mm) on control side for servicing.
7. Weights are an estimation and will vary based on selected options, insulation type, etc.
8. Coil furnished with stub sweat connections. Handedness of coil connections is determined by facing air stream.
9. Coils are provided without internal insulation. If the unit is to be installed in a location with high humidity, external insulation around the heating coil should be installed as required.
10. Unit is field convertible from a left-hand connection (shown) to right-hand by rotating unit.
(TOP VIEW)ARRANGEMENTS
A B C D
OUTLET PLENUM
HFE J
AIR
VALV
04
05
06
08
10
12
14
16
24RT 8000
4000
3000
2000
1400
900
500
350
225
CFM
1416
1888
3776
994
661
425
236
165
106
14" (356 mm)
16" (406 mm)
24" x 16"
12" (305 mm)
10" (254mm)
8" (203 mm)
6" (152 mm)
5" (127 mm)
4" (104 mm)
INLET SIZE(NOMINAL Ø)
(610 mm x 406 mm)
5.00" (127 mm)
4.50" (114 mm)
3.50" (89 mm)
5.55" (141 mm)
D
9.50" (241 mm)
15.50" (394 mm)
13.50" (343 mm)
H
11.50" (292 mm)
19.50" (495 mm)
11.50" (292 mm)
20.50" (521 mm)
18.50" (470 mm)
12.50" (318 mm)
W
15.50" (394 mm)
24.50" (622 mm)
28.50" (724 mm)
L
18.00" (457 mm)
15.00" (381 mm)
11.50" (292 mm)
11.00" (279 mm)
12.00" (305 mm)
13.00" (330 mm)
14.00" (356 mm)
DISCHARGE DIM W/O OUTLET PLENUM
A (h) B (w)
18.00" (457 mm)
23.00" (584 mm)
27.00" (686 mm)
8.00" (203 mm)
10.00" (254 mm)
12.00" (305 mm)
14.00" (356 mm)
19.00" (483 mm)
17.00" (432 mm)
14.00" (356 mm)
11.00" (279 mm)
10.00" (254 mm)
C
SINGLE-DUCT HOT WATER WITH OPTIONAL OUTLET PLENUM (VCWF)WT
Slip & Drive Connection—Terminalunits come standard with slip & driveconnection.
Outlet Plenum—A sheet metal,insulated box with circular opening(s)is attached to the discharge of themain unit at the factory. The circularopening(s) are centered on the unitplenum to accept round ductworkconnections.
Outlet Plenum with BalancingDampers—A sheet metal, insulatedbox with circular opening(s) is factory-connected to the main unit. Thecircular opening(s) with balancingdamper(s) are centered on the unitplenum to accept round ductworkconnections.
HOT WATER COILS
1-Row Hot Water Coils—The 1-rowhot water reheat coil is factory-installedon the discharge outlet. The coil has144 aluminum-plated fins per foot. Fullfin collars provided for accurate finspacing and maximum fin-tubecontact. The 3/8" (9.5 mm) ODseamless copper tubes aremechanically expanded into the fincollars. Coils are proof tested at450 psig (3102 kPa) and leak tested at300 psig (2068 kPa) air pressure underwater. Coil connections are left-hand.Right-hand connections are optional.
2-Row Hot Water Coils—The 2-rowhot water reheat coil is factory-installedon the discharge outlet. The coil has144 aluminum-plated fins per foot. Fullfin collars provided for accurate finspacing and maximum fin-tubecontact. The 3/8" (9.5 mm) OD seamlesscopper tubes are mechanicallyexpanded into the fin collars. Coils areproof tested at 450 psig (3102 kPa) andleak tested at 300 psig (2068 kPa) airpressure under water. Coils areassembled with headers that provide
AGENCY LISTINGThe unit is UL and Canadian UL Listedas a room air terminal unit. Control #9N65.
ARI 880 Certified.
INSULATION
1/2" (12.7 mm) Matte-facedInsulation—The interior surface ofthe unit casing is acoustically andthermally lined with ½-inch, 1.5 lb/ft3
(12.7 mm, 24.0 kg/m3) compositedensity glass fiber with a high-densityfacing. The insulation R-Value is 1.9. Theinsulation is UL listed and meets NFPA-90A and UL 181 standards. There areno exposed edges of insulation(complete metal encapsulation).
1" (25.4 mm) Matte-facedInsulation—The interior surface ofthe unit casing is acoustically andthermally lined with 1-inch, 1.0 lb/ft3
(25.4 mm, 16.0 kg/m3) compositedensity glass fiber with a high-densityfacing. The insulation R-Value is 3.85.The insulation is UL listed and meetsNFPA-90A and UL 181 standards. Thereare no exposed edges of insulation(complete metal encapsulation).
1/2" (12.7 mm) Foil-facedInsulation—The interior surface ofthe unit casing is acoustically andthermally lined with ½-inch, 1.5 lb/ft3
(12.7 mm, 24.0 kg/m3) density glassfiber with foil facing. The insulationR-Value is 2.1. The insulation is ULlisted and meets NFPA-90A and UL 181standards as well as bacteriologicalstandard ASTM C 665. There are noexposed edges of insulation (completemetal encapsulation).
1" (25.4 mm) Foil-facedInsulation—The interior surface of theunit casing is acoustically andthermally lined with 1-inch, 1.5 lb/ft3
(25.4 mm, 24.0 kg/m3) density glassfiber with foil facing. The insulationR-Value is 4.1. The insulation is ULlisted and meets NFPA-90A and UL 181standards as well as bacteriologicalstandard ASTM C 665. There are no
exposed edges of insulation (completemetal encapsulation).
1" (25.4 mm) Double-wallInsulation—The interior surface of theunit casing is acoustically andthermally lined with a 1-inch, 1.0 lb./ft3
(25.4 mm, 16.0 kg/m3) compositedensity glass fiber with high-densityfacing. The insulation R-value is 3.8. Theinsulation is UL listed and meetsNFPA-90A and UL 181 standards. Theinsulation is covered by an interiorliner made of 26-gage galvanized steel.All wire penetrations are covered bygrommets. There are no exposededges of insulation (complete metalencapsulation).
3/8" (9.5 mm) Closed-cellInsulation—The interior surface of theunit casing is acoustically andthermally lined with 3/8-inch, 4.4 lb/ft3
(9.5 mm, 70.0 kg/m3) closed-cellinsulation. The insulation is UL listedand meets NFPA-90A and UL 181standards. The insulation has anR-Value of 1.4. There are no exposededges of insulation (complete metalencapsulation).
PRIMARY AIR VALVE
Air Valve Round—The primary airinlet connection is an 18-gagegalvanized steel cylinder sized to fitstandard round duct. A multiple-point,averaging flow sensing ring isprovided with balancing taps formeasuring +/-5% of unit catalogedairflow. An airflow-versus-pressuredifferential calibration chart is provided.The damper blade is constructed of aclosed-cell foam seal that ismechanically locked between two22-gage galvanized steel disks. Thedamper blade assembly is connectedto a cast zinc shaft supported by self-lubricating bearings. The shaft is castwith a damper position indicator. Thevalve assembly includes a mechanicalstop to prevent over-stroking. At 4.0 in.wg, air valve leakage does not exceed1% of cataloged airflow.
Air Valve Rectangular—Inlet collar isconstructed of 22-gage galvanized steelsized to fit standard rectangular duct.An integral multiple-point, averagingflow-sensing ring provides primaryairflow measurement within +/-5% ofunit cataloged airflow. Damper is22-gage galvanized steel. The damperblade assembly is connected to a castzinc shaft supported by self-lubricatingbearings. The shaft is cast with adamper position indicator. The valveassembly includes a mechanical stop
Single-Duct
SD 29VAV-PRC008-EN
MechanicalSpecifications
7/8" (22.2 mm) OD braze connections.Right-hand connections are optional.
ELECTRIC HEAT COILThe electric heater is a factory-providedand -installed, UL recognizedresistance open-type heater withairflow switch. It also contains a disc-type automatic pilot duty thermalprimary cutout, and manual reset loadcarrying thermal secondary device.Heater element material is nickel-chromium. The heater terminal box isprovided with 7/8" (22 mm) knockoutsfor customer power supply. Terminalconnections are plated steel withceramic insulators. Heater controlaccess is on the left-hand side.
ELECTRIC HEAT OPTIONS
Electric Heat Transformer—Anoptional transformer is an integralcomponent of the heater control panel(dependent on unit load requirements)to provide 24 VAC for controls. There is19 VA available for controls.
Magnetic Contactor—An optionalelectric heater 24-volt contactor for usewith direct digital control (DDC) oranalog electronic controls.
Mercury Contactor—An optionalelectric heater 24-volt contactor for usewith direct digital control (DDC) oranalog electronic controls.
P.E. Switch with MagneticContactor—This optional switch andmagnetic contactor is for use withpneumatic controls.
P.E. Switch with MercuryContactor—This optional switch andmercury contactor is for use withpneumatic controls.
Airflow Switch— An air pressuredevice designed to disable the heaterwhen the system fan is off. This isstandard on single-duct units.
Line Fuse—An optional safety fuselocated in the line of power of theelectric heater to prevent power surgedamage to the electric heater.
Disconnect Switch—A optionalfactory-provided door interlockingdisconnect switch on the heater controlpanel disengages primary voltage tothe terminal.
UNIT CONTROLS SEQUENCE OFOPERATIONThe unit controller continuouslymonitors the zone temperature againstits setpoint and varies the primaryairflow as required to meet zonesetpoints. Airflow is limited by
minimum and maximum positionsetpoints. Upon a further call for heatafter the air valve is at minimum, anyhot water or electric heat associatedwith the unit is enabled.
DIRECT DIGITAL CONTROLS
DDC Actuator—Trane 3-wire,24-VAC, floating-point control actuatorwith linkage release button. Torque is35 in-lb minimum and is non-springreturn with a 90-second drive time.Travel is terminated by end stops atfully-opened and -closed positions. Anintegral magnetic clutch eliminatesmotor stall.Direct Digital Controller—Themicroprocessor based terminal unitcontroller provides accurate, pressure-independent control through the useof a proportional integral controlalgorithm and direct digital controltechnology. The controller, named theUnit Control Module (UCM), monitorszone temperature setpoints, zonetemperature and its rate of change,and valve airflow using a differentialpressure signal from the pressuretransducer. Additionally, the controllercan monitor either supply duct airtemperature or CO2 concentration viaappropriate sensors. The controller isprovided in an enclosure with 7/8"(22 mm) knockouts for remote controlwiring. A Trane DDC zone sensoris required.DDC Zone Sensor—The UCMcontroller senses zone temperaturethrough a sensing element located inthe zone sensor. In addition to thesensing element, zone sensor optionsmay include an externally-adjustablesetpoint, communications jack for usewith a portable edit device, and anoverride button to change theindividual controller from unoccupiedto occupied mode. The override buttonhas a cancel feature that will return thesystem to unoccupied. Wired zonesensors utilize a thermistor to vary thevoltage output in response to changesin the zone temperature. Wiring to theUCM controller must be 18- to 22-awg.twisted pair wiring. The setpointadjustment range is 50–88ºF (10–31°C).Depending upon the features availablein the model of sensor selected, thezone sensor may require from a 2-wireto a 5-wire connection. Wireless zonesensors report the same zoneinformation as wired zone sensors, butdo so using radio transmittertechnology. Therefore with wireless,
wiring from the zone sensor to the UCMis unnecessary.Digital Display Zone Sensor withLiquid Crystal Display (LCD)—The digital display zone sensor containsa sensing element, which sends a signalto the UCM. A Liquid Crystal Display(LCD) displays setpoint or spacetemperature. Sensor buttons allow theuser to adjust setpoints, and allow spacetemperature readings to be turned on oroff. The digital display zone sensor alsoincludes a communication jack for usewith a portable edit device, and anoverride button to change the UCM fromunoccupied to occupied. The overridebutton has a cancel feature, whichreturns the system to unoccupied mode.System Communications— TheController is designed to send andreceive data from a Tracer Summit™
or other Trane controllers. Current unitstatus conditions and setpoints may bemonitored and/or edited via this datacommunication feature. The networktype is a twisted wire pair shieldedserial communication.
ANALOG ELECTRONIC CONTROLS
Analog Actuator—A Trane 3- wire,24-VAC, floating-point control actuatorwith linkage release button. Torque is35 in-lb minimum and is non-springreturn with a 90-second drive time.Travel is terminated by end stops atfully-opened and -closed positions. Anintegral magnetic clutch eliminatesmotor stall.Analog Electronic Controller—Thecontroller consists of a circuit board thatoffers basic VAV unit operation andadditional override functions andoperates using 24 VAC power. Thecontroller uses a capacitive typepressure transducer to maintainconsistent air delivery regardless ofsystem pressure changes. The enclosurehas 7/8" (22 mm) knockouts for remotecontrol wiring. A Trane electronic zonesensor is required.Analog Electronic Thermostat—Thissingle-temperature, wall-mountedelectronic device utilizes a thermistor tovary the voltage output in response tochanges in the zone temperature.Connections to the VAV unit circuitboard are made using standard three-conductor thermostat wire. The setpointadjustment range is 63–85ºF (17–29°C).The sensor is available in two models.One model has a concealed, internally-adjustable setpoint. The other modelhas an externally-adjustable setpoint.
Single-Duct
VAV-PRC008-ENSD 30
PNEUMATIC CONTROLS
Normally Open Actuator —Pneumatic 3 to 8 psig (20 to 55 kPa)spring-range pneumatic actuator.
Normally-Closed Actuator—Pneumatic 8 to 13 psig (55 to 90 kPa)spring-range pneumatic actuator.
3011 Pneumatic Volume Regulator(PVR)—The regulator is a thermostatreset velocity controller, whichprovides consistent air delivery within5% of cataloged flow down to 18% orless of unit cataloged cfm, independentof changes in system static pressure.Factory-calibrated, field-adjustablesetpoints for minimum and maximumflows. Average total unit bleed rate,excluding thermostat, is 28.8 scim at20 psig (7.87 ml/min at 138 kPa) supply.
CONTROL OPTIONS
Transformer (VCCF, VCWF)—The50-VA transformer is factory-installedin an enclosure with 7/8" (22 mm)knockouts to provide 24 VAC forcontrols.
Disconnect Switch (VCCF, VCWF)—A toggle disconnect disengagesprimary power to the terminal.
Fuse (VCCF, VCWF)—Optional fuse isfactory-installed in the primary voltagehot leg.
HOT WATER VALVES
Two-Position Valve—The valve is afield-adaptable, 2-way or 3-wayconfiguration and ships with a cap tobe field-installed when configured as a2-way valve. All connections areNational Pipe Thread (NPT). The valvebody is forged brass with a stainlesssteel stem and spring. Upon demand,the motor strokes the valve. When theactuator drive stops, a spring returnsthe valve to its fail-safe position.
Electrical Rating – 7 VA at 24 VAC,6.5 Watts, 50/60 Hz
8 feet (2.44 m) of plenum rated wirelead is provided with each valve.
MechanicalSpecifications
Proportional Water Valve—Thevalve is a field-adaptable, 2-way or3-way configuration and ships with acap over the bottom port. Thisconfigures the valve for 2-wayoperation. For 3-way operation,remove the cap. The valve is designedwith an equal percentage plug. Theintended fluid is water or water andglycol (50% maximum glycol). Theactuator is a synchronous motor drive.The valve is driven to a predeterminedposition by the UCM controller using aproportional plus integral controlalgorithm. If power is removed, thevalve stays in its last position. Theactuator is rated for plenumapplications under UL 94-5V and UL873 standards.
Pressure and Temperature Ratings –The valve is designed and tested in fullcompliance with ANSI B16.15 Class250 pressure/temperature ratings,ANSI B16.104 Class IV control shutoffleakage, and ISA S75.11 flowcharacteristic standards.
Flow Capacity – 3.80 Cv , 6.60 Cv,0.70 Cv, 2.2 Cv
Overall Diameter – ½" NPT, ¾" NPT(7.30 Cv)
Maximum Allowable Pressure – 300psi (2068 kPa)
Maximum Operating FluidTemperature – 200ºF (93°C)
Maximum Close-off Pressure – 55 psi(379 kPa)
Electrical Rating – 6VA at 24 VAC.
10 feet (3.05 m) of plenum rated22-gage wire for connection.Terminations are #6 stabs.