Troubleshooting; Table 14 Table; Table 14 Troubleshooting The Liebert Xdp - Emerson Liebert XDP User Manual

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

Troubleshooting