Installation, Operation and Maintenance 10 - 5
Condenser Rfgt
Temp Sensor
MMR Friendly Open or Short Check Sensor,
Wiring And
Connections
Cond Entering
Wtr Temp Sensor
IFW N/A Open or Short Check Sensor,
Wiring And
Connections
Cond Leaving Wtr
Temp Sensor
IFW N/A Open or Short. Check Sensor,
Wiring And
Connections
Condenser Water
Flow Overdue
MAR N/A Condenser water flow was not proven within 4.25 minutes of the
condenser pump relay being energized. Diagnostic is reset with
return of flow.
Check Pump,
Valves, Flow Switch
Condenser Water
Flow Lost
MAR Friendly a. The condenser water flow switch input was open for more than 6-
10 continuous seconds.
b. 6-10 seconds of continuous flow shall clear this diagnostic.
c. Even though the pump times out in the STOP modes, this
diagnostic shall not be called out in the STOP modes.
Check Pumps,
Valves, Flow Switch
Current Overload
Setpts Error
IFW N/A a. The redundant overload settings did not agree for 30 continuous
seconds. (Continue to use the previous value for the 30 second
time-out.) When this diagnostic occurs the affected Starter Module
shall use the minimum overload setting as a default until either the
UCP2 is reset or, if the redundant settings agree again, the starter
module can go back to using the actual setting.
Review Overload
Set Up
Current Overload MMR Immediate Motor current exceeded overload time vs. trip characteristic. Verify Overload
Settings &
Compressor Unload
Discharge Temp
Sensor
MMR Friendly Open or Short. Check Sensor
Wiring And
Connections
Emergency Stop
Input
MMR Immediate 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.
Design: With input filtering and IPC delay, this will approach 2
seconds.
Check Emergency
Stop Input Device
Evap Entering
Wtr Temp Sensor
IFW N/A 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 Friendly Open or Short Check Sensor,
Wiring And
Connections
Evaporator Liquid
Level Sensor
MMR Friendly Open or short Check Sensor,
Wiring, and Stepper
Module
Evap Rfgt Temp
Sensor
MMR Friendly Open or Short Check Sensor,
Wiring And
Connections
Evaporator Water
Flow Overdue
MAR N/A Evaporator water flow was not proven within 4.25 minutes of the
Evaporator pump relay being energized. The diagnostic is reset with
the return of water flow.
Check Pump,
Valves, Flow Switch
External Chilled
Water Setpoint
IFW-AR N/A a. Function Not “Enabled”: no diagnostics.
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.
Check Signal At
Input
Diagnostic
Description
Diagnostic
Type
Shutdown
Action
Cause Help Message
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