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Information Manual 67
Chiller: Loss of Comm with
Rfgt Monitor
IFW-AR Chiller All The Chiller module lost communications with the
Refrigerant Monitor for 15 contiguous seconds.
Check IPC
Wiring/
Connections
Chiller: Loss of Comm with TCI IFW Chiller All The Tracer was setup as “installed” at the CLD
and the chiller module lost communications with
the TCI (comm 3 or comm 4) module for 15
contiguous seconds
Check IPC
Wiring/
Connections
Chiller Mod Off-Brd 5V Range IFW Chiller All An improper Off Board 5v voltage was detected
at the Chiller Module. A 5vdc is used for off-
board devices such as the pressure transducers.
The micro checks to see that the A/D value falls
within an acceptable range.
Check Chiller
Module Voltages
Chiller Mod Ref Voltage
Calibration
IFW Chiller All An improper reference voltage was detected at
the Chiller Module. A 2.5 vdc reference is used
to calibrate the non-ratiometric analog I/O such
as 2-10vdc and 4-20ma inputs as well as PWM
Analog outputs. The micro checks to see that the
A/D value falls within an acceptable range.
This diagnostic has not been implemented
Check Chiller
Module Voltages
Chlr Sat Cond Temp Sensor
(Purge)
(As Sensed by the Purge
module in Retrofit applications)
IFW Purge All Open or Shorted Sensor
a. Applies to Retrofit applications of the Purge
Only. Does not apply to UCP2 applications.
b. IFW to the chiller, MMR to the Purge.
Purge Inop: See
Purge O & M
Manual
Circuit: Loss of Comm with
Starter
MMR Circuit All The circuit module lost communications with the
Starter module for 15 contiguous seconds.
Check IPC
Wiring/
Connections
Circuit: Loss of Comm with
Chiller
MMR Circuit All The circuit module lost communications with the
Chiller module for 15 contiguous seconds.
On loss of communications, the circuit module
shall run the oil pump for the post lube time and
then turn the oil pump off. On loss of
communications, the circuit module shall
continue to control the oil heater.
Check IPC
Wiring/
Connections
Circuit Module 24 Vdc Ref
Missing
IFW Circuit All 24vdc reference missing and the Rfgt monitor is
installed.
Check Rfgt
Monitor Wiring/
24 Vdc Supply.
Circuit Mod Off-Brd 5V Range MMR Circuit All An improper Off Board 5v voltage was detected
at the Circuit Module. A 5vdc is used for off-
board devices such as the pressure transducers.
The micro checks to see that the A/D value falls
within an acceptable range.
Check Circuit
Module Voltages
Circuit Mod Ref Voltage
Calibration
IFW Circuit All An improper reference voltage was detected at
the Circuit Module. A 2.5 vdc reference is used
to calibrate the non-ratiometric analog I/O such
as 2-10vdc and 4-20ma inputs as well as PWM
Analog outputs. The micro checks to see that the
A/D value falls within an acceptable range.
See
Troubleshooting
Service Bulletin
Cond 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
Cond Entering Wtr Temp
Sensor
IFW Chiller All Open or Short Check Sensor,
Wiring And
Connections
Cond Leaving Wtr Temp Sensor See
Descripti
on
Chiller All Open or Short.
a. IFW on Chilled Water Control
b. MMR on Heat Pump (Hot Water) Control.
Check Sensor,
Wiring And
Connections
DIAGNOSTIC DESCRIPTION
Diag
Type
Module
that
Called
Diag.
Diag.
Active
Modes
CAUSE Help Message
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