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Troubleshooting
70
Motor Burnout
Check control panel for welded
contactor contacts or welded
overload contacts
Replace defective components.
Main 24VAC Fuse Trips
Shorts or loose connections Check the wiring connections of the 24 VAC circuit.
Faulty circuit board Replace the circuit board.
Unstable Pump
Operation
R-134a pump loop overcharged
While pump is running R-134a receiver level must be within
recommended levels (see
Figure 71).
R-134a pump loop undercharged
Filter dryer clogged
See Clogged Filter Dryer and/or Impeller symptom and
remedy.
Room Becomes
Too Warm
Liebert XDP is Off
Check status of the Liebert XDP at the user interface. Turn
system On at I/O button if system is Off.
High dew point
Check temperature and relative humidity (RH) of room. Lower
RH setpoint if necessary to lower dew point. At normal room
temperature of 68°F (20°C), the RH should be set to 50% or
lower.
Liebert XD cooling modules are Off
Check Liebert XD cooling modules to make sure that they are
On before starting the Liebert XDP.
Minimum room temperature setpoint
is too high
Check the setpoint in the User Setpoints menu (see
Figure 43).
Temperature/humidity sensors
incorrectly placed
Place the sensor on the return air side of the primary air mover
(eg., Liebert DS). Do not install the sensor near unsealed
doors, windows or similar areas.
Reduced Chilled Water
Flow Rate
Clogged strainer Clean or replace strainer
Fouled heat exchanger (no strainer
installed)
Replace heat exchanger and install 20-40 mess strainer
Increased Refrigerant
Temperature
Clogged strainer Clean or replace strainer
Fouled heat exchanger (no strainer
installed)
Replace heat exchanger and install 20-40 mess strainer
Table 14 Troubleshooting the Liebert XDP (continued)
Symptom Possible Cause Check or Remedy