Liebert 3000 manual Dehumidification troubleshooting, Glycol pump troubleshooting, Troubleshooting

		Troubleshooting
Table 24 Dehumidification troubleshooting
Symptom	Possible Cause	Check or Remedy
	Control not calling for	Check monitor status.
No dehumidification	dehumidification
	Compressor contactor not pulling in	See 6.4.8 - Compressor Functional
		Check and Table 23.
	Compressor won't run; fuse blown or	See 6.4.8 - Compressor Functional
	CB tripped	Check and Table 23. Check fuses or
		CBs and contacts. Check line voltage
Table 25 Glycol pump troubleshooting
Symptom	Possible Cause	Check or Remedy
Suddenly stops pumping	Clogged strainer or impeller	Clean out debris.
Suddenly slow pumping	Clogged impeller, diffuser, or line	Clean out debris and use strainer.
Excessive leakage around the pump	Worn seal or packing	Replace seal or packing.
shaft while operating
Performance poor	Worn impeller or seal	Replace with new impeller or seal.
	Suction lift too high	Relocate pump closer to supply.
	Motor not up to speed; low voltage	Larger lead wires may be required.
		Check for proper line voltage (±10%).
	Worn bearings	Replace pump
Noisy operation	Worn motor bearings	Replace pump
	Low discharge head	Throttle discharge-improve suction
		conditions.
	Debris lodged in impeller	Remove cover and clean out.
	Cavitating pumps	Adjust system pressures.
Table 26 Infrared humidifier troubleshooting
Symptom	Possible Cause	Check or Remedy
No humidification	Humidifier pan not filling	Check water supply.
		Check fill valve operation
		Check drain stand pipe adjustment
		Check for clogged waterline
	Control not calling for humidity	Check monitor status
	Humidity contact not pulling in	Check visually. If contact is made,
		check line voltage after contactor and
		fuses or CBs.
		Check for open humidifier safety stat.
		Jumper between terminals P35-6 and
		P35-15. If contactor pulls in, replace
		safety. Remove jumper.
	Humidifier bulb burned out	Replace bulb. Loosen lead on old
		bulb. Trim excess lead length on new
		bulb to avoid shorts.

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