Emerson VH, DE, VE, DH manual Humidifier-steam generator troubleshooting, Adjustments on

Troubleshooting

Table 26 Humidifier—steam generator troubleshooting

Symptom	Possible Cause	Check or Remedy
		Check drain valve to ensure that it drains freely. Check
False canister full		and replace if defective.
	Foaming
		Check water supply. If commercially softened,
indication
		reconnect to raw water supply. If connected to hot
		water reconnect to cold water.
Main 24 VAC fuse or	Shorts or loose connections	Check the wiring connections of the 24 VAC circuit.
circuit breaker trips	Faulty circuit board	Replace the circuit board.
		Verify that RUN/DRAIN switch is in the RUN position.
Unit ON, humidifier will	Humidifier not receiving power	Check fuses or CBs and replace or reset if necessary.
not operate
		Make sure molex connector is securely plugged into
		circuit board and that no wires art loose.
	No water available to unit	Check external shut-off valves.
Contactor pulled in, but
	Clogged fill line strainer	Clean or replace fill line strainer.
no water enters
	Wiring breaks or loose connections	Check for faulty wiring and loose connections.
canister
	Faulty circuit board	Replace circuit board.
Water enters canister,
but canister full circuit	Foaming	Check drain valve and water supply.
activates at a low water
level
		Check connection on component plate in humidifier
		cabinet Terminal #1 on the square block interface
		device must be connected to L2 of the power terminal
	Canister interface connections	block. L2 must also be connected to the electrode
		closest to the steam outlet port.
	incorrect
		Verify that the red wire from terminal #2 on the
Water enters canister,		interface connects to the red top terminal on the
		canister. This is the one farthest from the steam outlet
but canister full circuit		port and is the high water sensor probe.
activates at a low water
		Remove red canister full wire from canister. If normal
level
		operation resumes, canister must be replaced.
	Full isolation has broken down	Remove the wire from terminal #3 on the interface. If
		normal operation resumes, canister full interface must
		be replaced.
	Drain assembly not operating freely	Check and replace coil or valve if necessary.
	Faulty circuit board	Replace circuit board
Canister fills but	Canister full circuit does not activate	Check wiring of canister full interface. Replace circuit
overflows		board.
Humidifier contactor is	Cylinder full. Interface activated.	See similar symptoms above. Canister expired.
not pulled in (to reset,		Replace canister.
de-energize control	Problem with fill water system	Water supply is not on. Fill valve problem. Drain valve
unit)		stuck open.
		Canister expired. Replace canister. DIP switch
		settings changed with water in canister. Drain canister,
		call Liebert service.
	Humidifier amps reached 138% of full	Humidifier fill valve stuck open; check valve. Water
Red LED on humidifier	load	conductivity too high; check water conductivity/quality.
control board is on.		Contact Liebert service.
Humidifier contactor not		DIP switches set incorrectly. Refer to Circuit Board
pulled in (to reset, de-		Adjustments on page 62
energize control circuit)	Mineral deposits obstruct drain valve	Check drain valve for obstructions and clean if
		necessary.
	Faulty solenoid	Check for magnetic field at coil.
	Faulty circuit board	Replace circuit board.

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