Liebert XDC user manual Too warm

Troubleshooting

Table 24 Liebert XDC troubleshooting (continued)

Symptom	Possible Cause	Check or Remedy
	Liebert XDC is off.	Check status of the Liebert XDC at the user interface. Turn
		system On at I/O button if system is Off.
		Check temperature and relative humidity (RH) of room.
	High dew point	Lower RH setpoint if necessary to lower dew point. At normal
		room temperature of 68°F (20°C), the RH should be set to
Room becomes		50% or lower.
	Liebert XD cooling modules are Off.	Check Liebert XD cooling modules to make sure that they are
too warm
		On before starting the Liebert XDC.
	Minimum room temperature setpoint	Check the setpoint by following instructions in 5.3.2 -
	is too high.	SETPOINTS.
	Incorrect location of temperature-	Place the sensor on the return air side of the primary air
		mover (I.e., Liebert Deluxe System 3). Do not install the
	humidity senors
		sensor near unsealed doors, windows, and similar areas.
Pipe rattle	Loose pipe connections	Check pipe connections.
	No 24VAC power to motor	Check for 24VAC between P2-1 and P2-4.
Actuator motors	No signal from control	Check 24VAC at P22-1 (close) or P22-3 (close).
		Unplug P22 completely off of the board. Jumper P22-5 to P2-
(if applicable)
	Motor not operating	4 for grounding, then jumper P22-1 to P2-1 to drive close.
		Remove jumper to close, and then jumper P22-3 to P2-1 to
		drive open. If motor fails to work, replace it.
	Check control panel for welded
Motor burnout	contactor contacts or welded	Replace defective components.
	overload contacts
Main 24VAC	Shorts or loose connections	Check the wiring connections of the 24VAC circuit.
fuse trips	Faulty circuit board	Replace the circuit board.
Unstable pump	R-134a pump loop is overcharged	While pump is running R-134a receiver level must be within
operation		recommended levels (see Figure 31).

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