Liebert XDP160RM Troubleshooting the Liebert XDP, Symptom Possible Cause Check or Remedy

Troubleshooting

7.0TROUBLESHOOTING

Table 14	Troubleshooting the Liebert XDP
Symptom		Possible Cause	Check or Remedy
		No main power	Check L1, L2 and L3 for rated voltage.
		Loose electrical connections	Tighten connections.
Pump Will Not Energize		Overloads tripped	Allow pump to cool. Check amp draw.
		Tripped circuit breaker	Check circuit breaker to pump(s).
		Incorrect phase wiring	See Table 13.
		No chilled water	Check and verify that there is supply chilled water to the
			Liebert XDP.
		Isolation valve(s) on pump suction	Open all isolation valves completely during normal operation.
		and/or discharge is closed.
Pump Will Not Start or		Supply chilled water is too high	Check and verify that the chilled water temperature setpoint is
Run			at 50°F (10°C) or lower and that there is flow on the chilled
			water side.
		Liebert XD cooling modules are Off	Check Liebert XD cooling modules to make sure that they are
			On prior to starting the Liebert XDP.
			Check alarm(s) history on Liebert XDP. The Liebert XDP was
		Low Refrigerant Temperature	operating below the dew point for a significant amount of time.
			Check humidity in conditioned space, lower humidity if
		(high dew point)	necessary to allow Liebert XDP to operate at a lower
			temperature. (Disconnect must be switched to Off then back
			On to allow Liebert XDP to reset itself).
		Pressure switch not making contact	Check both differential pressure settings. If not within 6 psi, ±1
			psi (41kPa, ±7kPa; 0.41 bars, ±0.07bars) then manually
			change accordingly.
		Not enough charge	See 5.1 - Checklist for Liebert XDP Startup.
		Chilled water valve not closing	Wait at least 10 minutes before calibrating. Access the
Pump Will Not Start			Advanced Menu>Factory Settings>Calibrate Actuator.
		completely.
			Contact Liebert Services for assistance, 1-800-543-2778.
		Cavitation due to vapor in pump	Check for adequate charge in system, refer to the User's
			Manual. 5.1 - Checklist for Liebert XDP Startup
Pump Noisy
		Worn motor bearings	Replace pump
		Pump is rotating in reverse	See Table 13.
			1. Check humidity of the room along with the location of
			remote sensors. Make sure that the sensors are not in a cold
		Low refrigerant temperature	area where there is insufficient air flow for accurate,
			representative readings.
			2. Chilled Water temperature is too cold.
			3. Load is too light.
		Loss of power	When power is restored, the Liebert XDP will automatically
Liebert XDP (Pump)			restart.
Suddenly Stops		Clogged filter dryer and/or impeller	Clean out debris
		Leak in system - loss of charge	Check the entire system for leaks with a refrigerant sniffer.
			Repair as necessary.
		Low chilled water temperature alarm	Check supply chilled water temperature.
		and loss of flow Pump X alarm
		Supply refrigerant sensor failure	Check wiring.
		alarm	Call service.
Clogged Filter Dryer		Debris or other contaminants in	Replace.
and/or Impeller		refrigerant
Pipe Rattle		Loose pipe connections	Check pipe connections.
		Motor operates but valve won't open	Check linkage for adjustment and be sure that it is tight on the
			valve.
Chilled Water Valve Not		No 24 VAC power to motor	Check for 24 VAC between P52-1 and P52-4.
		No signal from control	Check 24 VAC at P22-1 (close) or P22-3 (open).
Working
			Unplug P22 from the board. Jumper P22-5 to P52-4 for
		Motor not operating	grounding, then jumper P22-1 to P52-1 to drive close. Remove
			jumper to close and then jumper P22-3 to P52-1 to drive open.
			If motor fails to work, replace it.

69