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Information Manual 69
CWS/Leaving Wtr Temp. Cutout
Setpt Overlap
also overlap of CWS and Low
Refrigerant Temp Cutout.
None None All 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.
N/A
DCM: Loss of Comm with Chiller
A
IFW Chiller All The DCM module lost communications with the
chiller A Chiller module for 15 contiguous
seconds
Check IPC
Wiring/
Connections
DCM: Loss of Comm with Chiller
B
IFW Chiller All The DCM module lost communications with the
chiller B Chiller module for 15 contiguous
seconds
Check IPC
Wiring/
Connections
DCM: Loss of Comm with
Starter A
IFW Chiller All The DCM module lost communications with the
chiller A Starter module for 15 contiguous
seconds
Check IPC
Wiring/
Connections
DCM: Loss of Comm with
Starter B
IFW Chiller All The DCM module lost communications with the
chiller B Starter module for 15 contiguous
seconds
Check IPC
Wiring/
Connections
DCM: Loss of Comm with TCI A IFW Chiller All The DCM module lost communications with the
chiller A TCI module for 15 contiguous seconds
Check IPC
Wiring/
Connections
DCM: Loss of Comm with
Stepper A
IFW Chiller All The DCM module lost communications with the
chiller A Stepper module for 15 contiguous
seconds
Check IPC
Wiring/
Connections
Differential Oil Pressure
Overdue
MMR Circuit Pre-Lube 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.
See
Troubleshooting
Service Bulletin
Differential Oil Pressure Switch
(CVGD and CVAD units only)
MMR Circuit 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.
Check Oil
Pressure
Switch/Wiring.
Discharge Temp Sensor MMR Stepper All Open or Short, only if HGBP and the Discharge
Temp. Sensor is called out as “Installed” at the
Human Interface.
Check Sensor
Wiring And
Connections
Emergency Stop Input MMR Chiller All 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.
Check
Emergency Stop
Input Device
Evap Diff Water Press
Transducer
IFW Options All Input Shorted or Open and the Diff. water
pressure sensing option, > 150 psig, is “installed”
at the CLD.
Check Sensor,
Wiring, and
Connections
Evap Entering Wtr Temp Sensor IFW Chiller All 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.
Check Sensor,
Wiring And
Connections
Evap Leaving Water Temp
Sensor
MMR Chiller All Open or Short Check Sensor,
Wiring And
Connections
DIAGNOSTIC DESCRIPTION
Diag
Type
Module
that
Called
Diag.
Diag.
Active
Modes
CAUSE Help Message
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