Trane CVHE Information Manual page 74

DIAGNOSTIC DESCRIPTION
CWS/Leaving Wtr Temp. Cutout
Setpt Overlap
also overlap of CWS and Low
Refrigerant Temp Cutout.
DCM: Loss of Comm with Chiller
A
DCM: Loss of Comm with Chiller
B
DCM: Loss of Comm with
Starter A
DCM: Loss of Comm with
Starter B
DCM: Loss of Comm with TCI A
DCM: Loss of Comm with
Stepper A
Differential Oil Pressure
Overdue
Differential Oil Pressure Switch
(CVGD and CVAD units only)
Discharge Temp Sensor
Emergency Stop Input
Evap Diff Water Press
Transducer
Evap Entering Wtr Temp Sensor IFW
Evap Leaving Water Temp
Sensor
Information Manual
Diag Module Diag.
Type that Active
Called Modes
Diag.
None None All
IFW Chiller All
IFW Chiller All
IFW Chiller All
IFW Chiller All
IFW Chiller All
IFW Chiller All
MMR Circuit Pre-Lube
MMR Circuit Pre-Lube
MMR Stepper All
MMR Chiller All
IFW Options All
Chiller All
MMR Chiller All
CAUSE
No diagnostic, limit value to last legal value and
tell the operator about it on the second line of the
display.
NOTE: The above is not a diagnostic because
you don't want the display vectoring you to a
different display state when you are trying to set
either the chilled water setpoint or the leaving
water temp. cutout setpoint as it will in the case
of a diagnostic.
The DCM module lost communications with the
chiller A Chiller module for 15 contiguous
seconds
The DCM module lost communications with the
chiller B Chiller module for 15 contiguous
seconds
The DCM module lost communications with the
chiller A Starter module for 15 contiguous
seconds
The DCM module lost communications with the
chiller B Starter module for 15 contiguous
seconds
The DCM module lost communications with the
chiller A TCI module for 15 contiguous seconds
The DCM module lost communications with the
chiller A Stepper module for 15 contiguous
seconds
A differential oil pressure 0f 9 psid was not
established within 3 minutes of starting the Oil
Pump in the Pre-Lube Mode.
Design: Some hysteresis was introduced into
this diagnostic. 9 psid is the criteria to establish
pre-lube oil flow and 8 psid is used to define a
loss of oil flow on pre-lube.
Just prior to starting the oil pump the Differential
Oil Pressure Switch is checked to be sure it's
contacts are open (not stuck or jumpered), if not
set this diagnostic.
Open or Short, only if HGBP and the Discharge
Temp. Sensor is called out as "Installed" at the
Human Interface.
a. EMERGENCY STOP input is open. An
external interlock has tripped. Time to trip from
input opening to unit stop shall be 0.1 to 1.0
seconds.
Input Shorted or Open and the Diff. water
pressure sensing option, > 150 psig, is "installed"
at the CLD.
Open or Short
a. Normal operation, no effects on control.
b. Chilled Water Reset, Will just run at either
normal CWS or will run at maximum reset
permitted.
Open or Short
Diagnostics Menu
Help Message
N/A
Check IPC
Wiring/
Connections
Check IPC
Wiring/
Connections
Check IPC
Wiring/
Connections
Check IPC
Wiring/
Connections
Check IPC
Wiring/
Connections
Check IPC
Wiring/
Connections
See
Troubleshooting
Service Bulletin
Check Oil
Pressure
Switch/Wiring.
Check Sensor
Wiring And
Connections
Check
Emergency Stop
Input Device
Check Sensor,
Wiring, and
Connections
Check Sensor,
Wiring And
Connections
Check Sensor,
Wiring And
Connections
69