Emerson DE, VH, VE, DH manual Humidifier-infrared troubleshooting, Reheat troubleshooting

Troubleshooting

Table 26 Humidifier—steam generator troubleshooting (continued)

Symptom	Possible Cause	Check or Remedy
		Verify that drain valve operates freely when activated.
	Drain valve clogged or defective	Clean valve and replace coil or valve if defective.
		Flush canister several times and replace if arcing
		persists
Excessive arcing in the		If water is commercially softened, reconnect humidifier
	Improper water supply	to raw water supply, drain canister, and restart If
canister		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,		Turn the % pot to roughly 82% (80%). Restart
canister fills, high water	Conductivity of water too low	humidifier. If canister fails to reach FLA in 24 hours,
alarm activates and		have water supply conductivity checked.
humidifier fails to reach
		If humidifier returns to canister full condition, verity that
full amperage after 24	Fill solenoid not closing tightly
hours		the fill solenoid closes tightly.

Table 27 Humidifier—infrared troubleshooting
Symptom	Possible Cause	Check or Remedy
		Check water supply.
	Humidifier pan not filling	Check fill valve operation
		Check drain stand pipe adjustment
		Check for clogged waterline
	Control not calling for humidity	Check monitor status
No humidification
		Check visually. If contact is made, check line voltage
		after contactor and fuses or CBs.
	Humidity contact not pulling in
		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
	Control not calling for heat	Check monitor status.
Reheat will not operate;
		Jumper between terminals P34-1 and P34-2. If reheat
contactor not pulling in	Reheat safety stat open	operates, safety is open. Remove jumper. Replace
		safety.
Reheat not operating,	Heater burned out	Turn off power and check heater continuity with Ohm
contactor pulling in		meter.

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