Trane CVHE Troubleshooting

Troubleshooting and Checkout Procedures for CVHE/F/G Units with UCP2 Controls
Module Compatibility .................................. 36
UCP2 Module Compatibility................................ 36
Description of UCP2 Options ...................... 37
1. Tracer Communications Interface Module (Com 3 Module)
37
2. Tracer Communications Interface Module (Com 4 Module)
37
3. Remote Clear Language Display Module............... 37
4. Options Module ...................................................... 37
5. Printer Interface Module......................................... 37
6. Chilled Water Reset Outdoor Air
Temperatures............................................................. 38
7. Water Pressure Sensors For Evap And Cond System
Pressure Less Than 150 Psig..................................... 38
8. Bearing Oil Temperature Sensors........................... 38
9. Phase Voltage Sensors............................................ 38
10. Enhanced Condenser Limit................................... 38
11. Discharge Temp Sensor ........................................ 38
12. Starter By Others................................................... 38
UCP2 Modules .............................................. 39
Chiller Module...................................................... 39
Circuit Module...................................................... 40
lnput/Output Module............................................ 41
Options Module.................................................... 42
Purge Module....................................................... 43
Starter Module Values......................................... 44
Stepper Module.................................................... 45
Duplex Module..................................................... 46
Module Dip Switch Settings......................... 47
UCP2 Board Dip Switch Settings ....................... 47
Chiller Module...................................................... 47
Options Module.................................................... 47
Tracer COM 3 ....................................................... 47
Tracer COM 4 ....................................................... 47
IPC Buffer............................................................. 47
Duplex Control Module (DCM)............................ 48
Printer................................................................... 48
Diagnosing A Non-Working
Stepper Module............................................. 50
Method to Troubleshoot a UCP2 Stepper
Module and Actuator........................................... 50
I. Overview ................................................................. 50
II. Quick Test of Stepper Board.................................. 50
II. Check Stepper Motor and Wiring for Shorts and Opens
52
IV. Motor Voltages for CTV Stepper Motor .............. 54
Procedures For Module Set-Up................... 55
External Current Limit Setpoint......................... 55
Refrigerant Monitor Input................................... 55
% RLA Output...................................................... 55
External Chilled Water Setpoint ........................ 56
External Auto-Stop:............................................ 57
Analog Input Table
Abbreviations ................................................ 59
Pressure vs Voltage for Oil Pressures............... 59
60
Pressure vs Voltage for Water Pressures ......... 61
Purge Compressor Suction Temp...................... 64
Bearing Temp., Oil Temp. and Compressor
Discharge Temp.................................................. 72
Information on the Oil Pressure Sensor
Calibration Diagnostic.................................. 83
Transducer Checkout Procedure ................ 84
Quick Test Procedure For Mediamate Water
Pressure Transducer.......................................... 84
Starter Contactor Sequence......................... 85
Starter Module CT Voltage and
Currents......................................................... 87
-Current Input Transfer Function ...................... 87
Troubleshooting The Percent
Condenser Output:....................................... 89
From UCP2 Initial Release (July 93) to 10/21/96 Soft-
ware Release: ............................................................ 89
As of the 10/21/96 Software Release Including Fastpak
and UCP2 Enhancements:......................................... 90
Refrigerant Differential Pressure Indication............... 90
External Current Limit Setpoint................. 91
Percent RLA Output .................................... 93
Current Overload Protection: ..................... 94

Trane CVHE Specifications

General

Brand	Trane
Model	CVHE
Category	Chiller
Language	English