Table 19 Steam Generating Humidifier Troubleshooting - Emerson Liebert Challenger iCOM 3000 Operation & Maintenance Manual

Table 19 Steam generating humidifier troubleshooting
Symptom
False canister full indication
Main 24 VAC fuse or circuit
breaker trips
Main fuses blow
approximately 15 seconds
after unit is activated
Main fuses blow when
drain valve is activated.
Unit On, humidifier will not
operate
Contactor pulled in, but no
water enters canister
Water enters canister, but
canister full circuit activates
at a low water level
Canister fills but overflows
™
Liebert ® Challenger 3000
Possible Cause
Foaming
Shorts or loose connections
Faulty circuit board
Faulty solenoid
Conductivity too high
Mineral deposits obstruct
drain valve
Faulty solenoid
Faulty circuit board
Humidifier not receiving power
No water available to unit
Clogged fill line strainer
Wiring breaks or loose
connections
Faulty circuit board
Foaming
Canister interface connections
incorrect
Full isolation has broken down
Drain assembly not operating
freely
Faulty circuit board
Canister full circuit does not
activate
Check or Remedy
Check drain valve to ensure that it drains freely. Check and
replace if defective.
Check water supply. If commercially softened, reconnect to
raw water supply. If connected to hot water reconnect to
cold water.
Check the wiring connections of the 24 VAC circuit.
Replace the circuit board.
Check for magnetic field at coil.
Check amp draw of humidifier on startup. If it exceeds rated
amps, increase setting of the % pot on the circuit board
Check drain valve for obstructions and clean if necessary.
Check for magnetic field at coil.
Replace circuit board.
Verify that RUN/DRAIN switch is in the RUN position.
Check fuses or CBs and replace or reset if necessary.
Make sure molex connector is securely plugged into circuit
board and that no wires are loose.
Check external shutoff valves.
Clean or replace fill line strainer.
Check for faulty wiring and loose connections.
Replace circuit board.
Check drain valve and water supply.
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 block. L2 must also
be connected to the electrode closest to the steam outlet
port.
Verify that the red wire from Terminal #2 on the interface
connects to the red top terminal on the canister. This is the
one farthest from the steam outlet port and is the high water
sensor probe.
Remove red canister full wire from canister. If normal
operation resumes, canister must be replaced. Remove the
wire from Terminal #3 on the interface. If normal operation
resumes, canister full interface must be replaced.
Check and replace coil or valve if necessary.
Replace circuit board
Check wiring of canister full interface. Replace circuit board.
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Troubleshooting