Trane RTHC - Page 101

Diagnostic Table
RTHC-SVD01B-EN 95
External
Current Limit
Setpoint
IFW-AR
n/a
Options
1U5
All Not “Enabled”- no diagnostics. “Enabled “-
Out-Of-Range Low or High, set diagnostic,
default CLS 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.
EXV Electrical
Drive Circuit
Open
MMR
n/a
Stepper
1U3
On Demand
and Pre-Start
Run the EXV electrical drive circuit test
both on demand from the human interface
and just before a start.
Check Stepper module,
wiring, & motor.
High Cprsr
Discharge
Temp .
MMR
Stepper
1U3
All The discharge temp. exceeded 190 F + or -
5F. Time to trip from trip value exceeded
shall be 0.5 to 2.0 seconds.
Check Rfgt and Oil
charge.
High Diff. Rfgt
Pressure
MMR
friendly
Stepper
1U3
Starter
contactor
energized
The difference between the Condenser
pressure and the evaporator pressure
exceeded 160 PSID for 0.8-5.0 seconds.
152PSID must hold, 152+ to trip in One
Hour.
Check Cond and Evap
water flow.
High
Evaporator
Liquid Level
MMR
friendly
Stepper
1U3
Starter
contactor
energized
The liquid level sensor is seen to be at or
near its high end of range for 80 contiguous
minutes while the compressor is running
Check EXV, Sensor,
Stpr Module & Rfgt
Charge
High Pressure
Cutout Tripped
MMR
immediate
Chiller
1U1
All A high pressure cutout was detected. C.O.
on rise @ 180 psig, reset at 135 psig (+/-5
psid on switching tolerance) Note: Pressure
relief valve is 200 Psi +- 2% ,
Check Cond Water
Temp., Discharge
Isolation Valves, and for
Rfgt Over-Charge
High Restart
Inhibit Timer
Warning
IFW
n/a
Starter
1U2
All The Restart Inhibit timer has reached a
maximum threshold for the host chiller.
This is 15 minutes. This indicates
excessive chiller cycling, steps should be
taken to correct this.
Check for excessive
chiller cycling.
Incorrect
Chiller
Software
Installed
MMR
n/a
Chiller
1U1
All The incorrect Eprom was loaded into this
module. This diagnostic is detected when a
factory test computer sets the unit type to
something other than what the Eprom
software was intended for.
Replace Chiller Module
Incorrect
Stepper
Software
Installed
MMR
n/a
Stepper
1U3
All The incorrect Eprom was loaded into this
module. This diagnostic is detected when a
factory test computer sets the unit type to
something other than what the Eprom
software was intended for.
Replace Stepper
Module
Table 14-2: Diagnostic Table
Diagnostic
Description
Type/
Shutdown
Action
Module
Calling
Out Diag.
Operating
Modes
Diagnostic is
Active
Cause Help Message