Trane CVRC-M-1D Manual page 100

Diagnostic Description
CWS/Leaving Wtr Temp. Cutout
Setpt Overlap
Differential Oil Pressure Overdue
Differential Oil Pressure Switch
Discharge Temp Sensor
Emergency Stop Input
Evap Entering Wtr Temp Sensor
Evap Leaving Water Temp Sensor MMR
Evap Rfgt Temp Sensor
Evaporator Water Flow Overdue
Extended Compressor Surge
Extended Power Loss
Note: This diagnostic and the
function tied to it are handled by
the Check Clock diagnostic.
External Chilled Water Setpoint
100
Diagnostics Tables
Diag. Active
Diag Modes Cause
Type (Non-Active
Modes)
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.
MMR Prelube A differential oil pressure of 9 psid was not established within 3
minutes of starting the Oil Pump in the Pre-Lube Mode.
MMR Prelube ust prior to starting the oil pump the differential pressure switch
is checked to be sure it's contacts are open (not stuck or
jumpered). If not set this diagnostic.
MMR All Open or Short, only if HGBP and the Discharge Temp. Sensor is
called out as "Installed" at the Clear Language Display.
MMR All 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.
IFW 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.
All Open or Short
MMR All Open or Short
MMR Estab. Evaporator water flow was not proven within 4.25 minutes of the
Evap. Water Evaporator pump relay being energized.
Flow on
going from
STOP to
AUTO
MMR All Running An extended Surge condition was detected and the Surge
protection feature was Enabled at the Clear Language Display.
Modes
IFW All The Unit Lost Power for an extended period of time. On CTV
units if power is lost for an extended period of time the oil pump
is not run on Power Up. If a power loss is determined to be a
Momentary Power Loss the Oil Pump is run on the Power Up to
Post Lube the bearings. The deciding factor determining if a
power loss is extend or Momentary is TBD.
IFW- All a. Not "Enabled": No diagnostics.
AR b. "Enabled": Out-Of-Range Low or Hi, set diagnostic, default
CWS to next level of priority (e.g. Front Panel setPoint). This
IFW diagnostic will automatically reset if the input returns to the
normal range.
Help Message
N/A
See Troubleshooting
Service Bulletin.
CVHE-SB-32
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
Check Pump, Valves,
Flow Switch
Check Condenser
Water Temp.
Check Main Power
Supply and Wiring
Check Signal At Input
CVRC-M-1D