Trane S*HF*20-75 Troubleshooting Manual page 122

DIAGNOSTICS Menu
Table 11: Diagnostics Troubleshooting Chart (continued)
Cond Sump Max Level
Failure
Used With: DX cooling w/
water cooled condensers.
Module: MCM
Cond Sump Min Level or
Drain Fail
Used With: DX cooling w/
water cooled condensers.
Module: MCM
Condenser Sump Temp
Sensor Failure
Used With: DX cooling w/
water cooled condensers.
Module: MCM
122
Problem: The condenser
sump water level reaching
the Cond Sump Max Level
Switch is considered an
undesirable condition
indicating a problem with
the mechanical float valve
or some other water control
mechanism.
Check: Max level switch,
float apparatus, and wiring
Problem:
Min Level Fail: The Cond
Water Sump Fill Relay is
energized, the 30-minute
fill timer expired and the
Cond Water Sump Min
Level Input has not closed.
Drain Fail: The Cond
Sump Min Level Input has
remained CLOSED for 5
continuous minutes after a
Cond Sump Drain Request
has occurred.
Check: wiring from the
MCM to the Sump Fill valve,
water flow to the sump,
sump min level switch and
associated wiring.
Problem: The Condenser
Sump Temperature Sensor
input is out of range.
(Temperature < -40F or
Temperature > 200 F).
Check: Wiring from the
MCM to the temperature
sensor. Removing the plug
from the MCM there should
be no shorts or opens on
the wires, readings should
between 830 ohms and
345k ohms.
The Cond Sump Fill Relay
will be de-energized.
All compressor circuits are
locked out due to inability
to determine if the sump
has sufficient water level.
De-energize the Heat relay.
A compressor lockout is
generated on all circuits
and the Condenser Sump is
drained completely if the
Outdoor Air Temp is below
35F or failed.
(PAR) Once the Cond Sump
Max Level Switch input is
open for 120 continuous
seconds the diagnostic will
be cleared and the Cond
Sump Fill Relay will be
energized.
(PAR) An automatic reset
occurs after:
Min Level Fail: the Cond
Water Sump Min Level
Input is closed for 10
continuous seconds.
Drain Fail: the Cond Sump
Min Level is open for 10
continuous seconds.
Both: clear the diagnostic
and compressor lockouts.
(PAR) An automatic reset
occurs and the sump is
allowed to fill after the
Condenser Sump Temp
input rises above 40F for 10
seconds.
RT-SVP07B-EN