Trane VariTrane VAV-SVX02B-EN Installation Operation & Maintenance Download Page 1 | Manualshive

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Installation/
Operation
Maintenance

VariTrane

™

Pneumatic Controls

VAV-SVX02B-EN

March 2002

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Summary of Contents for VariTrane VAV-SVX02B-EN

Page 1: ...Installation Operation Maintenance VariT rane Pneumatic Controls VAV SVX02B EN March 2002 ...

Page 2: ...e 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 re...

Page 3: ...trates 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 4 illustrates the pressure temperature characteristics for a reverse acting thermostat As room temperature increases the thermostat output pressure decreases A thermostat in proper ...

Page 4: ...igure 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 ...

Page 5: ...as adjust ment CW increases the output CCW decreases it This 11 0 psi cross over would yield the following operational chart Specifications Maximum Pressure 30 psig Connections 3 16 4 mm nipples for 6 4 mm OD polyethylene tubing Air Consumption 0 5 SCFH 236 L M 20 psig Material ABS Weight 3 oz Chart Input 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Output 20 19 18 17 16 15 14 13 12 11 10 9 ...

Page 6: ...at delta P must be calibrated in the same position that it is mounted Connections Figure 10 illustrates a typical piping diagram of a normally open or normally closed unit Figure 10 Typical Piping Diagram of Normally Open or Normally Closed Unit Selecting Direct or Reverse ActingThermostat 3011 The model 3011 PVR must be calibrated to operate with either a direct acting or reverse acting thermosta...

Page 7: ...hich 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 HI stat delta P m...

Page 8: ...sure 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 Normally OpenValve Normally OpenValve 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 maximu...

Page 9: ...ssure 20 0 psi Minimum Supply air Pressure 15 0 psi Maximum SupplyAir Pressure 30 0 psi Average SupplyAir 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 Reset Span Range 0 10 psi Maximum SafeThermostat Input 30 psi closed chamber OperatingTemperature 40 120 F StorageTemperature 40 140 F Main Thermostat Actuato...

Page 10: ...l is acceptable any other position is not acceptable 2 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 therm...

Page 11: ...m If the actuator pressure is less than 3 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 HI stat minimum 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 Normally OpenValve Dire...

Page 12: ... wg Maximum Setpoint Range 6 0 in wg Normal SupplyAir Pressure 20 0 psi Minimum Supply air Pressure 15 0 psi Maximum SupplyAir Pressure 30 0 psi Specifications 3501 Output Sensitivity 5 psi 02 Average SupplyAir Consumption 43 2 scim at 20 psi Reset Start Point Range 0 10 psi Reset Span Range 0 7 psi OperatingTemperature 40 120 F StorageTemperature 40 140 F ...

Page 13: ...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 extendedTorque Based on 0 20 psi applied 8 13 psi 55 90 kPa 68 59 in lbs 8 7 Nm 90 deg 3 8 psi 21 55 kPa 25 102 in lbs 3 12 Nm 90 deg Su...

Page 14: ...ypical piping diagram 1 Set t stat to full heat 2 Set LO thermostat maximum to the desired maximum flow on the heating deck 3 Set t stat to full cool 4 Set HI thermostat minimum to the desired minimum flow on the heating deck 5 Set LO thermostat adjustment knob on cooling deck CV deck to desired constant volume 6 Exercise the system to check flows for proper operation Figure 15 Typical Constant Vo...

Page 15: ...ir Volume Dual Duct Calibration 3011 Figure 16 is a typical piping diagram of aVAV 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 the PVR the unit will have both the heating and cooling deck at ...

Page 16: ... 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...

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