Liebert XDP160RC, XDP160RM, XDP160RA user manual See Clogged Filter Dryer and/or Impeller symptom

Troubleshooting

Table 14 Troubleshooting the Liebert XDP (continued)

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

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