Emerson Liebert Deluxe System/3 DH - Manual (Page 77)

Troubleshooting
69
Excessive arcing in the
canister
Drain valve clogged or defective
Verify that drain valve operates freely when activated.
Clean valve and replace coil or valve if defective.
Flush canister several times and replace if arcing
persists
Improper water supply
If water is commercially softened, reconnect humidifier
to raw water supply, drain canister, and restart If
connected to hot supply, reconnect to cold water.
Insufficient drain rate
Increase drain rate by adjusting % pot on circuit board
above the preset 87% (85%) to roughly 92% (90%).
Excessive iron content in water
Analyze iron cement of water. If it exceeds 0.1 mg/l,
install a filter to remove iron from water supply.
On cold start-up,
canister fills, high water
alarm activates and
humidifier fails to reach
full amperage after 24
hours
Conductivity of water too low
Turn the % pot to roughly 82% (80%). Restart
humidifier. If canister fails to reach FLA in 24 hours,
have water supply conductivity checked.
Fill solenoid not closing tightly
If humidifier returns to canister full condition, verity that
the fill solenoid closes tightly.
Table 27 Humidifier—infrared 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.
Table 28 Reheat troubleshooting
Symptom Possible Cause Check or Remedy
Reheat will not operate;
contactor not pulling in
Control not calling for heat Check monitor status.
Reheat safety stat open
Jumper between terminals P34-1 and P34-2. If reheat
operates, safety is open. Remove jumper. Replace
safety.
Reheat not operating,
contactor pulling in
Heater burned out
Turn off power and check heater continuity with Ohm
meter.
Table 26 Humidifier—steam generator troubleshooting (continued)
Symptom Possible Cause Check or Remedy