Diagnostic Table
94 RTHC-SVD01B-EN
Current
Overload
Setpts Error
IFW
n/a
Starter
1U2
All The redundant overload settings did not
agree for 30 contiguous seconds.
Review Overload Set
Up.
CWS/Leaving
Wtr Temp.
Cutout Setpt
Overlap also
Overlap of
CWS and Low
Refrigerant
Temp Cutout.
None
n/a
Chiller
1U1
All No diagnostic, limit value to last legal value. N/A
Discharge
Te m p Se n so r
MMR
friendly
Stepper
1U3
All Open or Short Check Sensor Wiring
And Connections.
Emergency
Stop Input
MMR
friendly
Chiller
1U1
All EMERGENCY STOP input is open. An
external interlock has tripped. Time to trip
from input opening to unit stop is 2
seconds.
Check Emergency Stop
Input Device. Confirm
Chiller Module
operation.
Evap Entering
Wtr Temp
Sensor
IFW
n/a
Chiller
1U1
All Open or Short. Normal operation-no
effects on control. Chilled Water Reset-will
run at either normal CWS or will run at
maximum reset permitted.
Check sensor wiring
and connections.
Evap Leaving
Water Temp
Sensor
MMR
friendly
Chiller
1U1
All Open or Short Check sensor wiring
and connections.
Evap Rfgt
Te m p Se n so r
MMR
friendly
Stepper
1U3
All Open or Short Check sensor wiring
and connections.
Evaporator
Liquid Level
Sensor
MMR
friendly
Stepper
1U3
All Open or short Check Sensor, Wiring &
Stepper Module
Evaporator
Water Flow
Overdue
MAR
n/a
Chiller
1U1
Estab. Evap.
Water Flow on
going from
STOP to
AUTO.
Evaporator water flow was not proven
within 4.25 minutes of the Evaporator pump
relay being energized.
Check pump, valves
and flow switch
External
Chilled Water
Setpoint
IFW-AR
n/a
Options
1U5
All Not “Enabled”-no diagnostics. “Enabled“-
Out-Of-Range Low or High, 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 on
the Option module.
Table 14-2: Diagnostic Table
Diagnostic
Description
Type/
Shutdown
Action
Module
Calling
Out Diag.
Operating
Modes
Diagnostic is
Active
Cause Help Message
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