Problem 41: Hot Gas Bypass (Hgbp) Does Not Work; Problem 42: Ice Making - Trane CVHE Troubleshooting Manual

2 Check and correct oil sump pressure transducer wiring.
3 Program correct local atmospheric pressure.
4 Replace the oil sump pressure transducer.
5 Replace the Circuit module, bad oil sump pressure input.
6 Replace Circuit module. Software improvement in modules X-13650451-12 and greater.

Problem 41: Hot Gas Bypass (HGBP) Does Not Work.

Corrective Action:
1 Module Compatibility:
~ Chiller must be X-13650450-04 or newer
~ CLD module must be X-13650448-05 or newer
~ Option module is X-13650452-01 or newer.
2 Hot Gas Bypass Option must be installed in the machine configuration. Installing HGBP
control sets up the display features associated with HGBP.
3 Hot Gas Valve Control in the service test menu must be in the Auto Mode.
4 Hot Gas Bypass Control enabled in the field startup group. With this enabled, the IGV target%
screen comes up along with the HGBP timer. Enable and Maximum HGBP time.
5 IGV target% has a default of 10%. This is a good place to start. The goal is to keep the unit
out of surge.
6 The Inlet Guide Vane must be closed or at a minimum to go into Hot Gas. Set the guide vane
travel stop in the service settings. ROM default is 0%.
7 The Chilled Water Setpoint minus the actual chilled water temperature must be 0.6
greater, i.e., Setpoint of 45
would show the need for Hot Gas.
8 Verify the Hot Gas Timer is installed and max HGBP time is greater than zero.
9 Verify that the module software numbers are being displayed in the Service Test Menu.
10 Verify that the IPC Communications wire is connected to J1 of all modules and we have good
24 VAC and 5 VDC.

Problem 42: Ice Making

UCP2 will accept a contact closure (Options module J3 7,8) input to initiate Ice
building. When in ice making the compressor will be fully loaded.
Corrective action:
1 Enable ice making in machine configuration.
2 Binary input required on the Options module J3 7,8. If you enter ice making externally or a
remote communicated input (Tracer) to initiate ice building.
3 Operator settings:
~ Ice building enable. DO NOT enable this or you will not be able to exit ice building. ROM
default is disable. NOTE: This is typically used by Service to manually enable ice making.
~ Set Front panel ice termination setpoint. ROM default is 27
~ Set the ice making to normal cooling transition timer. ROM Default is 5 min.
4 Ice building shall be able to be terminated by one of three methods:
CVHE-SB-32A
°
F and leaving temperature of 44
°
°
F for more than 20 seconds
°
F
F or
18