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.

 

61

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Liebert 3000 manual Dehumidification troubleshooting, Glycol pump troubleshooting, Infrared humidifier troubleshooting

3000 specifications

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