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MAINTENANCE
WARNING
ELECTRIC SHOCK HAZARD. Disconnect main electrical
power to the humidifier at the circuit breaker and drain the
water from unit before servicing. Hot surface inside.
NOTICE
• Service should be performed by an HVAC technician.
• Use only genuine replacement parts.
INSPECT HUMIDIFIER WHEN SERVICING
• Replace canister and O-ring annually
• Clean drain valve and fill valve screen annually
• Replace electrode wires every 3 years or as needed (see step 3 of
CANISTER REPLACEMENT AND DRAIN VALVE SERVICE)
SERVICE SHUTDOWN PROCEDURE
1 . Press On/Off button to turn humidifier off (see FIGURE 16) .
2 . Allow humidifier to drain .
3 . When the green Drain light (see FIGURE 16) stops flashing,
disconnect main electrical power to humidifier at the circuit breaker .
4 . Allow the unit to cool .
5 . Shut off water supply to unit .
FIGURE 16 – Steam Humidifier
On/Off button
1
and light
Drain light
2
Front panel
3
Side panel
4
Service light
5
CANISTER REPLACEMENT AND DRAIN VALVE SERVICE
1 . Remove front panel (see FIGURE 16) .
2 . Pull three wires off posts on top of canister (two electrode wires
and one water level probe wire, shown in FIGURE 17A and
FIGURE 17B) .
3 . Inspect the two electrode wires (see ELECTRODE WIRE
REPLACEMENT section for detailed instructions) .
Replace them if they are:
• Not tightly fitting
• Damaged
• Over 3 years old or age is unknown
• Have D shaped connectors (see FIGURE 18A)
FIGURE 17A –
Two Circuit Boards
ONE WIRE MUST GO THROUGH
CURRENT-SENSING TOROID
WATER LEVEL
PROBE
3
FIGURE 18A –
4
"D" Shaped Connector
1
2
5
FIGURE 17B –
One Circuit Board
POWER
RELAY
ELECTRODE
POST
FIGURE 18B –
"O" Shaped Connector
CANISTER ELECTRODES
J8
J10
90-2352
90-2736
21
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