Trane S*HF*20-75 Troubleshooting Manual page 121

Table 11: Diagnostics Troubleshooting Chart (continued)
Compressor Trip
(Ckt-1 or Ckt-2)
Used With: See
compressor protection
devices on MCM control
wiring schematic.
Module: MCM
Condenser Pressure
Sensor Failure (Ckt-1 or
Ckt-2)
Used With: DX cooling w/
water cooled condensers.
Module: MPM
Condenser Sump Heater
Failure Manual
Used With: DX cooling w/
water cooled condensers
w/sump heater.
Module: MCM
Condenser Sump Pump
Manual Fail
Used With: DX cooling w/
water cooled condensers.
Module: MCM
RT-SVP07B-EN
Problem: The compressor
proving input for the given
circuit has been detected
open continuously for more
than 3 seconds during
compressor operation.
Check: All compressor
protection devices in the
associated refrigerant
circuit's 115v contactor
control wiring circuit.
Problem: The saturated
condenser pressure sensor
input is out of range for the
given circuit.
Check: Wiring from the
MPM to the pressure
sensor. The input voltage
range should be between:
0.625 and 4.80VDC.
Problem: The sump min
level switch is CLOSED, and
the Sump Water
Temperature is less than
37.5 F, and has remained
this way for 20 minutes.
Check: Actual water level,
minimum level switch,
heater power circuitry.
Problem: Sump Pump
contactor auxiliary
contacts do not close (state
change), within 6 seconds,
when the pump is
requested ON for
mechanical cooling, or are
open for 6 continuous
seconds during compressor
operation.
Check: Wiring to sump
pump, contactor, and
auxiliary contacts. Check
for pump operation.
All compressors on the
associated circuit will be
locked out and prevented
from operation.
All compressors on the
associated circuit will be
locked out and prevented
from operation.
The unit will perform Sump
Water Freeze Protection
function.
A compressor lockout is
generated on all circuits.
DIAGNOSTICS Menu
(PMR) A manual reset is
required after this
diagnostic occurs. The
Diagnostic can be reset by
the unit mounted Human
Interface Module or Tracer,
or by cycling power to the
RTM.
(PAR) An automatic reset
occurs after the Condenser
Pressure Sensor input
returns to within range for
10 continuous seconds.
(PMR) A manual reset is
required anytime after the
Diagnostic is set to re-
enable compressor
operation. The Diagnostic
can be reset by the Human
Interface or Tracer, or by
cycling power to the RTM.
(PMR) A manual reset is
required anytime after the
Diagnostic is set to re-
enable compressor
operation. The Diagnostic
can be reset by the Human
Interface or Tracer, or by
cycling power to the RTM.
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