Trane Fan-Powered Low-Height Parallel Installation and Maintenance Manual
Contents
1. VariTrane Pneumatic Controls March 2002 VAV SV X02B EN S TRANE Thermostat Selection and Location In general both one and two pipe thermostats have a gain of 2 5 psi per degree Fahrenheit unless special thermostats are used that provide a different gain The major difference between them is that a one pipe thermostat is considered a low capacity thermostat and a two pipe thermostat is considered a high capacity thermostat When selecting between one pipe and two pipe thermostats consider the following Use one pipe thermostat when tubing runs are less than 50 feet from thermostat to controller a single thermostat will control no more than three controllers slower response is desired from the thermostat Use two pipe thermostat when tubing runs exceed 50 feet from thermostat to controller a single thermostat will control four or more controllers high capacity air is required due to restrictions in the air line Thermostat Piping The two pipe thermostat Figure 1 includes a restrictor internally Attach supply air line and output pressure branch line to the thermostat The one pipe thermostat Figure 2 requires an external restrictor tee Connect main air supply to restricted leg of restrictor tee Connect branch line from restrictor tee to the thermostat Thermostat Figure 1 Two Pipe Remote Thermostat Reverse Acting Two Pipe Remote Mounted T Stat Revers2. reset start point from 3 psi to approximately 4 psi The cooling deck volume regulator must have its thermostat range changed from 8 13 psi to 7 12 psi This is adjusted by changing the reset start point from 8 psi to approximately 7 psi By overlapping the thermostat spring ranges we were able to have 0 cfm minimum settings on both the heat and cool deck and still maintain the required unit minimum cfm of 400 cfm The calibration of the PVR is the same as the normal calibration procedures previously described in this manual VAV SVX02B EN 15 Constant Volume Single Duct VAV VCV 3011 This is used when a constant volume of air is required to supply a zone A thermostat is still often required to modulate a reheat coil to maintain temperature control The thermostat is never connected to the T port on the volume regulator The following procedure is used to calibrate this type of unit with a PVR Constant Volume Single Duct VAV VCV 3011 1 Be sure there is 0 psi at the T port 2 Set LO thermostat adjustment knob to desired unit cfm The unit will now modulate to the calibrated cfm setting See Figure 18 for typical constant volume single duct piping diagram Figure 18 Typical Constant Volume Single Duct Piping Diagram HI LO Flow Ring Volume a Regulator I Actuator me a a Sy 20 20 137 9 137 9
3. 0 psi Adjusting the Reset Span 3011 The reset span is factory set at 5 psi This is the thermostat pressure difference from which the PVR delivers flow from minimum to maximum setpoints This range is not normally changed unless a special control scheme is used where control operation must be changed To field adjust a different reset span follow these steps 1 Connect an accurate gage to port G 2 Apply 20 psi to port T 3 Adjust reset span to indicate the desired span on port G see Figure 12 4 LO stat and Hl stat delta P must now be readjusted see following calibration procedure Figure 12 Adjusting Reset Span VAV SVX02B EN G RESET START Apply 20 psi 3 ST 7 LOSTATAP Adjust to obtain desired reset span S TRANE Calibration Procedures Calibration Procedure Steps 1 4 apply to all thermostat models 1 Be sure the PVR is installed correctly and that all connections are hooked up to the proper ports See Figure 9 for unit application 2 Remove the caps on the tees which are connected to the lines to the flow sensor Connect a 0 2 magnehelic gage to monitor flow sensor delta P The higher pressure port is further upstream on the air valve inlet 3 Remove the thermostat line and connect a hand pump with a 0 20 psi gage to port T 4 Tee a 0 20 psi gage in the line from port B on the volume regulator to the air
4. 5 SCFH 236 L M 20 psig out Material Bias Adjustment ABS 15 psi Weight 3 oz VAV SVX02B EN S TRANE Model 3011 Pneumatic Volume Regulator Model 3011 Installation The model 3011 Pneumatic Volume 1 Attach bracket either vertically or horizontally to the illustration surface Horizontal Regulator PVR is capable of operating is preferred vertical is acceptable any other position is not acceptable see Figure 9 with normally open or normally closed 2 air valves and can operate with either direct acting DA or reverse acting RA thermostats Insert controller into its bracket Controller may be face up face down face left or face right The controller LO and HI stat delta P must be calibrated in the same position that it is mounted Figure 9 Acceptable Installation Positions O Oe ey in log gt SH e e o No TRANE RN Connections Figure 10 illustrates a typical piping diagram of a normally open or normally closed unit Figure 10 Typical Piping Diagram of Nor mally Open or Normally Closed Unit Normally Open Unit or Normally Closed Unit g Volume Bac iii LO l __F n Regulat S _ Regulator _ An Restrictor Tee m L LLEN HER Actuator Restricted Leg Z Airflow Sensor cs SN Selecting Direct or Reverse
5. Acting Thermostat 3011 The model 3011 PVR must be calibrated to operate with either a direct acting or reverse acting thermostat The control must also be changed when used with a normally open or normally closed air valve 6 VAV SVX02B EN S TRANE Model 3011 Pneumatic Volume Regulator Use the following procedure to set up the PVR 1 Select damper action NO or NC Loosen damper selection switch screw and align to either the NO or NC pointer with damper pointer and tighten screw 2 Now determine the type of thermostat that will be used If a direct acting thermostat is used the reset start pressure is typically 8 psi If a reverse acting thermostat is used the reset start pressure is typically 3 psi see Figure 11 3 With an accurate gage 0 10 psi connected to port G regulate the thermostat pressure to port T to desired start point pressure 4 Adjust reset start to indicate 0 psi on port G and continuing adjusting to indicate a pressure slightly higher than 0 psi i e 0 1 psi Figure 11 Adjusting Reset Start Adjust to obtain 0 0 1 psi at port G Connect 0 10 psi Gage Factory set at 5 psi B M DAMPER O Adjustable 0 10 psi Connect Hand Pump Input desired LO stat pressure at t stat port 0 20 psi Handpump RESET SPAN NOTE The arrows on the damper selector must be aligned exactly or the range of the controller will be limited
6. retard or advance the out signal 3 6 15 15 _ Inc 12 Output Branch Pressure um nc Input Pressure Signal 4 VAV SVX02B EN Calibration By using the bias adjustment on the relay the factory set 8 0 9 0 cross over can be changed To recalibrate the relay should be connected as illustrated in Figure 8 Pressure S TRANE Reversing Relay Figure 8 Recalibrating Reversing Relay Gage Bias U o Regulator A M Adjustment Screw M cC If the new desired cross over pressure is 11 0 psi this must be applied to port 3 by adjusting the pressure regulator The bias adjustment is then turned until 11 0 psi is obtained on the output gage Turning the bias adjust ment CW increases the output CCW decreases it This 11 0 psi cross over would yield the following operational chart New Cross over pressure Chart Input 1 2 3 4 5 6 7 8 9 10 1 12 13 14 15 16 17 18 19 20 Output 20 19 18 17 16 15 14 13 12 1 10 9 8 7 6 5 4 3 2 1 Specifications Maximum Pressure Ambient Limits 30 psig 40 F 120 F operating 4 C 49 C Connections Mounting 3 16 4 amp mm nipples for J4 6 4mm OD In line via air connections PO yne tubing Factory Settings Air Consumption 9 psig in 9 psig out and 8 psig in 8 psig 0
7. the PVR the unit will have both the heating and cooling deck at minimum with a thermostat signal of 8 psi In order to have a unit minimum cfm and still have 0 cfm minimums on both the heating and cooling deck special calibration is required The PVR has a reset start adjustment knob which allows the unit to be calibrated to a minimum cfm This is achieved by Outlet Heating Cooling Valve Valve Normally Normally Open Open Lo AHI N Actuator LO HI Volume Regulator Ai Restrictor Tee Two Pipe Remote Mounted T Stat Direct Acting crossing over the thermostat ranges Figure 17 illustrates this concept Figure 17 Example Unit Minimum 400 cfm N O Heating Valve Min 0 cfm Max 1000 cfm N O Cooling Valve a MinOcfm Max 1000 cfm Unit Min Valve Min T o 12 Thermostat Range 3 8 psi Heating Valve 5 psi range Thermostat Range 8 13 psi Cooling Valve 5 psi range Approximately 1000 cfm divided by 5 psi 200 cfm 1b Due to the relationship between velocity pressure and cfm for both the cooling and heating PVR a linear relationship between cfm and psi does not exist To obtain a unit minimum cfm of 400 cfm the heating deck volume regulator must have its thermostat range changed from 3 8 psi to 4 9 psi This is adjusted by changing the
8. typical piping diagram 1 Set t stat to full heat 2 Set LO thermostat maximum to the desired maximum flow on the heating deck t 3 Set t stat to full cool Set HI thermostat minimum to the desired minimum flow on the heating deck Set LO thermostat adjustment knob on cooling deck CV deck to desired constant volume 6 Exercise the system to check flows for proper operation Dual Duct Piping Diagram Constant Volume Fd Flow Ring a LO utlet x FN Or Z Heati Cooling VAN L Valve a F pn Volume Normally Normally Regulator Open Open d LO J 7 HI S A Pa 5 ts A Two Pipe ST Lat Tt Remote Mounted i Sta Aw E _ Direct Acting Actuator Volume Regulator s 20 IN 137 9 SR a 137 9 14 VAV SVX02B EN S TRANE Variable Air Volume Dual Duct Calibration 3011 Variable Air Volume Dual Figure 16 Typical VAV Dual Duct Piping Diagram Duct Calibration 3011 Figure 16 is a typical piping diagram of a VAV dual duct unit The unit has a thermostat piped to both pneumatic volume regulators PVR which will operate the heating deck from a thermostat signal of 3 8 psi The cooling deck will operate from a thermostat signal of 8 13 psi With normal calibration of
9. unless a special control scheme is used where control operation must be changed To field adjust a different reset span follow these steps 1 Connect an accurate gage to port G Apply 20 psi to port T 3 Adjust reset span to indicate the desired span on port G LO stat and Hl stat delta P must now be readjusted see following calibration procedure VAV SVX02B EN Calibration Procedures S TRANE Calibration Procedure Steps 1 4 apply to all thermostat models 1 Be sure the PVR is installed correctly and that all connections are hooked up to the proper ports flow sensor delta P The higher pressure port is further upstream on the air valve inlet Remove the caps on the tees which are connected to the lines to the flow sensor Connect a 0 2 magnehelic gage to monitor 3 Remove the thermostat line and connect a hand pump with a 0 20 psi gage to port T 4 Tee a 0 20 psi gage in the line from port B on the volume regulator to the air valve actuator Normally Open Valve Normally Closed Direct Acting Thermostat Reverse Acting Thermostat Direct Acting Thermostat Reverse Acting Thermostat 5 Set port T at 0 psi 5 Set port T at 0 psi 5 Set port T at 0 psi 5 Set port T at 0 psi 6 Monitor the delta P and 6 Monitor the delta P and 6 Monitor the delta P and 6 Monitor the delta P and adjust the LO stat adjust the LO stat delta P adjust the LO stat adjus
10. valve actuator Normally Open Valve Normally Open Valve Direct Acting Thermostat See Figure 13 for proper connections 5 Set port T at 0 psi 6 Monitor the delta P and adjust the LO stat mini mum adjustment to desired minimum 7 Set port T input at 16 psi or greater with the hand pump 8 Monitor the delta P and adjust the Hl stat maxi mum adjustment to desired maximum flow If the actuator pressure is less than 3 psi the air valve is wide open and duct pressure must increase to increase flow 9 Set port T at 0 psi 10 Monitor the minimum flow delta P If it is not correct adjust the LO stat adjustment knob Reverse Acting Thermostat See Figure 13 for proper connections 5 Set port T at 0 psi 6 Monitor the delta P and adjust the LO stat delta P maximum adjustment to desired maximum If the actuator pressure is less than 3 psi the air valve is wide open and duct pressure must increase to increase flow Set prot T to 16 psi or greater with the hand pump 8 Monitor the delta P and adjust the Hl stat mini mum adjustment to desired minimum flow 9 Set port T at 0 psi 10 Monitor the maximum flow delta P If it is not correct adjust the LO stat adjustment knob N Figure 13 Connections of Direct Reverse Acting Thermostat with Normally Open Valve Direct Acting Thermostat See Figure 14 for proper connections 5 Set
11. Tee 7 g i Two Pipe N m Remote Mounted KS 11 T Stat 75 8 Reverse Acting Stage 1 Airflow NJ 12 5 Safety Switch 86 2 Stage 2 14 P E Stage Switch es 96 5 Normally Open Stage 3 Electric Heater Terminal Box TRANE Trane An American Standard Company www trane com For more information contact your local district office or e mail us at comfort trane com Literature Order Number VAV SVX02B EN File Number SV TD VAV000 SVX02B EN 0302 Supersedes VAV SVX02A EN and VAV IOM 6 Stocking Location La Crosse Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice Only gualified technicians should perform installation and servicing of eguipment referred to in this publication
12. bracket either vertically or horizontally to the installation surface Horizontal is preferred vertical is acceptable any other position is not acceptable Insert controller into its bracket Controller may be face up face down face left or face right The controller LO and HI stat delta P must be calibrated in the same position that it is installed Selecting Direct or Reverse Acting Thermostat 3501 The model 3501 PVR must be calibrated to operate with either a direct acting or reverse acting thermostat The control must also be changed when used with a normally open or normally closed air valve Use the following procedure to set up the PVR Select damper action NO or NC Loosen damper selection switch screw and align to either the NO or NC pointer with damper pointer and tighten screw Now determine the type of thermostat that will be used If a direct acting thermostat is used the reset start pressure is typically 8 psi If a reverse acting thermostat is used the reset start pressure is typically 3 psi With an accurate gage 0 30 psi connected to port G regulate the thermostat pressure to port T to 10 5 psi Adjust reset start to indicate 2 5 psi on port UU Adjusting the Reset Span 3501 The reset span is factory set at 5 psi This is the thermostat pressure differ ence from which the PVR delivers flow from minimum to maximum setpoints This range is not normally changed
13. e Connect Hand Pump Handpump Normally Closed Unit AJAG LOJ Hi TT Actuator Airflow Sensor F OA e aii les oe 0 2 Magnahelic Gage HI LO Apply 20 psi Volume Regulator Ny Connect 0 20 psi Gage Connect Hand Pump 0 2 psi Handpump VAV SVX02B EN Specifications 3011 Differential Pressure Range 0 to 1 0 in wg Minimum Setpoint Range Oto 1 0 H O Maximum Setpoint Range minimum to 1 0 in wg Operating Static Range 0 25 6 0 in wg VAV SVX02B EN Normal Supply Air Pressure 20 0 psi Minimum Supply air Pressure 15 0 psi Maximum Supply Air Pressure 30 0 psi Average Supply Air Consumption 28 8 scim at 20 psi Thermostat Pressure Input Range Adjustable 0 10 psi band from 0 20 psi Reset Start Point Range 0 10 psi S TRANE Specifications 3011 Reset Span Range 0 10 psi Maximum Safe Thermostat Input 30 psi closed chamber Operating Temperature 40 120 F Storage Temperature 40 140 F Main Thermostat Actuator and Static Pick up Connections 250 O D S TRANE Model 3501 The model 3501 Pneumatic Volume Regulator PVR is capable of operating with normally open or normally closed air valves and can operate with either direct acting DA or reverse acting RA thermostats Model 3501 Pneumatic Volume Regulator 1 Installation Attach
14. e Acting Figure 2 Typical One Pipe Thermostat Reverse Acting Tee W One Pipe Ld ee Remote Mounted L T Stat J Reverse Acting l N Restricted Leg es 20 Fan 137 9 P E 2 Switch 1 N O 9 PSI 62 06 kPa VAV SVX02B EN Specifications TP970 Series Pneumatic T stats Maximum Safe Air Pressure 25psi 172 kPa Maximum Safe Air Temperature 150 F 66 C Throttling Range 2 10 F 1 5 C Gain 2 5 psi F Adjustable VAV SVX02B EN Thermostat Operation Pneumatic thermostats modulate output air pressure in response to room air temperature Pneumatic thermo stats fall into two categories direct acting or reverse acting This section describes how thermostat output pressure responds to changes in room temperature Figure 3 graphically illustrates the relationship between room temperature and output pressure of a direct acting thermostat The graph in Figure 3 shows that as the room temperature increases so does the output pressure of the thermostat Figure 3 Direct Acting Thermostat Response Output Pressure Input Temperature S TRANE Figure 4 illustrates the pressure temperature characteristics for a reverse acting thermostat As room temperature increases the thermostat output pressure decreases Figure 4 Reverse Acting Thermostat Response Output Pressure Input Temperature A thermostat in
15. ectional rotation Slide bushing onto shaft into actuator aligns actuator with damper lock collar and bushing set screws and install bracket Maintenance No routine maintenance is required Specifications Effective Area 8 sq in 52 sq cm Normal Rotation 100 deg Supply Pressure 0 to 20 psig 138 kPa operating 30 psig 207 kPa max Spring Ranges Retracted extended Torque Based on 0 amp 20 psi applied 8 13 psi 55 90 kPa 68 59 in Ibs 8 7 Nm 90 deg 3 8 psi 21 55 kPa 25 102 in Ibs 3 12 Nm 90 deg Supply Connection 3 16 5 mm nipple for 74 6 mm OD polyethylene tubing Material Body Glass filled nylon Diaphragm Neoprene Weight 1 5 Ibs 0 68 kg Ambient Limits Operating 20 F 120 F 299C 499C Shipping 40 F 140 F 40 C 60 C 13 S TRANE Constant Volume Dual Duct Calibration 3011 This calibration procedure is used when a constant volume of air must be maintained through a unit On a dual duct unit a constant volume discharge sensor is used to measure the air leaving the unit The PVR controlling to a constant volume of air leaving the unit uses the discharge sensor to maintain the specified cfm Figure 15 Typical Constant Volume Constant Volume Dual Duct Calibration 3011 This PVR does not reguire a thermosta connected to the PVR The following procedure must be used when calibrating a constant volume dual duct unit See Figure 15 for a
16. port T at 0 psi 6 Monitor the delta P and adjust the LO stat mini mum adjustment to desired minimum 7 Setport T input at 16 psi or greater with the hand pump 8 Monitor the delta P and adjust the Hl stat maximum adjustment to desired maximum flow If the actuator pressure is greater than 13 psi the air valve is wide open and duct pressure must increase to increase flow 9 Set port T at 0 psi 10 Monitor the minimum flow delta P If it is not correct adjust the LO stat adjustment knob Reverse Acting Thermostat See Figure 14 for proper connections 5 Set port T at 0 psi 6 Monitor the delta P and adjust the LO stat delta P maximum adjustment to desired maximum flow If the actuator pressure is greater than 13 psi the air valve is wide open and duct pressure must increase to increase flow 7 Set prot T to 16 psi or greater with the hand pump 8 Monitor the delta P and adjust the Hl stat mini mum adjustment to desired minimum flow 9 Set port T at 0 psi 10 Monitor the maximum flow delta P If it is not correct adjust the LO stat adjustment knob Figure 14 Connections of Direct Reverse Acting Thermostat with Normally Closed Valve Normally Open Unit hL Lo HI Airflow Sensor 0 2 Magnahelic Gage Apply 20 psi Volume Regulator Ps V 0 10 Connect 0 20 psi Gag
17. proper working order will be able to output a pressure ranging from approximately 5 psi to supply air pressure depending on distance from indicated setpoint S TRANE Reversing Relay Installation and Operation Figure 6 Reversing Relay Connections The reversing relay is a proportional non bleeding device for use in pneu matic control systems where a propor Output tional signal from a controlling device S Branch must be reversed see Figure 5 The Lo most common use of the reversing 20 relay is to change the action of a 137 9 pneumatic thermostat Figure 5 Pneumatic Reversing Relay Trane Part No RLY 755 9 PSI In 4B 62 06 kPa Reversing Rel a 9 PSI Out __ 62 06 kPa U a Input Branch The reversing relay requires three piping connections main supply air Figure 7 Reversing Relay Characteristics input signal air and output branch air see Figure 6 The branch line pressure decreases in direct proportion to an increase in the input signal pressure and vice versa The input signal is also amplified thereby minimizing any pneumatic line transmission lag see Figure 7 Input pressure to the relay and output pressure to the PR should always add up to a constant which is usually set between 16 and 25 psi For example with a constant of 18 six pound input signal will result in a 12 pound branch signal A bias adjustment screw is provided to
18. si 10 Monitor the minimum flow delta P If it is not correct adjust the LO stat adjustment knob 9 Set prot T to 16 psi or greater with the hand pump Monitor the delta P and adjust the Hl stat minimum adjustment to desired minimum flow Set port T at O psi 10 Monitor the maximum flow delta P If it is not correct adjust the LO stat adjustment knob 1a S TRANE Specifications 3501 Differential Pressure Range Oto 1 0 in wg Minimum Setpoint Range Oto 1 0 H O Maximum Setpoint Range minimum to 1 0 in wg Maximum Setpoint Range 6 0 in wg Normal Supply Air Pressure 20 0 psi Minimum Supply air Pressure 15 0 psi Maximum Supply Air Pressure 30 0 psi Specifications 3501 Output Sensitivity 5 psi 02 Average Supply Air Consumption 43 2 scim at 20 psi Reset Start Point Range 0 10 psi Reset Span Range 0 7 psi Operating Temperature 40 120 F Storage Temperature 40 140 F VAV SVX02B EN MCP 3631 Rotary Pneumatic Damper Actuator Description Rotary actuators mounts to a standard 72 diameter shaft by a locking collar and bushing Models MCP 3631 5000 8 13 psi range 55 90 kPa Normally Closed operation MCP 3631 8000 3 8 psi range 21 55 kPa Normally Open operation VAV SVX02B EN S TRANE MCP 3631 Rotary Pneumatic Damper Actuator Installation Method Slide collar onto shaft Slide actuator onto shaft noting dir
19. t the LO stat delta P minimum adjustment to maximum adjustment to minimum adjustment maximum adjustment to desired minimum desired maximum If the to desired minimum desired maximum If the 7 Set port T input at actuator pressure is less Set port T input at actuator pressure is 16 psi or greater with a 3 psi ary valve is 16 psi or greater with Lo aN 13 psi Un air the hand pump wide open and duct the hand pump valve is wide open an pressure must increase duct pressure must 8 Monitor the delta P and to increase flow Monitor the delta P and increase to increase flow 9 adjust the Hl stat maximum adjustment to desired maximum flow If the actuator pressure is less than 3 psi the air valve is wide open and duct pressure must increase to increase flow Set port T at 0 psi 10 Monitor the minimum flow delta P If it is not correct adjust the LO stat adjustment knob VAV SVX02B EN 9 Set prot T to 16 psi or greater with the hand pump Monitor the delta P and adjust the Hl stat minimum adjustment to desired minimum flow Set port T at 0 psi 10 Monitor the maximum flow delta P If it is not correct adjust the LO stat adjustment knob adjust the Hl stat maximum adjustment to desired maximum flow If the actuator pressure is greater than 13 psi the air valve is wide open and duct pressure must increase to increase flow 9 Set port T at 0 p
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