Honeywell HM750A1000 Mode D'emploi page 21

Drain Valve Removal
(for cleaning or replacement)
Always clean the drain valve before installing a new cylinder.
Scale from the spent cylinder may have fallen into the drain
valve and could prevent its proper operation. To properly
clean the drain valve it must be removed and disassembled.
WARNING
Disconnect main power source before accessing
internal compartments.
The inside of the humidifier cabinet contains high
voltage components and wiring. Access should be
limited to authorized personnel.
NOTE: If the cylinder has not already been removed,
follow the instructions on page 20.
1. Disconnect spade terminals from the drain valve.
2. Hold the hose connected to the drain valve and pull
forward while at the same time pressing on the drain
valve locking tab to release the valve body from its
mount. See Fig. 30.
3. Disconnect the hose from the drain valve by pulling
on the hose. With the valve free of the humidifier it
can be disassembled and cleaned.
4. On a work bench or suitable work area, first remove
the solenoid from the drain valve using a Phillips
screwdriver. See Fig. 31.
5. Pull the solenoid from the core.
6. Using an adjustable wrench, unscrew the core
counterclockwise from the drain valve body.
7. Carefully remove the core assembly (this includes
the plunger and return spring) from the plastic drain
valve body. The plunger seal (rubber stop) can be
cleaned using a plastic brush (tooth brush) or damp
cloth. Do NOT use a metal brush or chemical
cleaning agents as this could damage the part.
PHILLIPS
HEAD
SCREW
CLEAN PLUNGER
SEAL IF REQUIRED
SOLENOID CORE
Fig. 31. Drain valve components.
21
4. TILT THE
DRAIN VALVE
UP AND OUT.
1. DISCONNECT
SPADE TERMINALS
FROM DRAIN
VALVE.
Fig. 30. Removing the drain valve.
8. Rinse the valve body with cold water to clean any
internal debris.
9. Once the valve is clean, reassemble by performing
the above procedure in reverse. When fitting the core
back on the drain valve body, do NOT overtighten.
Thread the core back onto the drain valve body by
hand. When the core is fully threaded by hand,
tighten 1/4 additional turn with an adjustable
wrench.
10. Reinstall the drain valve in reverse order to its
removal. Be sure the hose connected to the drain
valve is tucked back in position within the housing
so it does not interfere with cylinder reinstallation.
CHECK DRAIN VALVE
BODY FOR DEBRIS
SPRING PLUNGER
HM750A1000
2. PULL OUT
ON HOSE
CONNECTED
TO DRAIN
VALVE.
3. PRESS ON
DRAIN VALVE
LOCKING TAB.
MCR37238
VALVE
BODY
M37239
33-00289EF—02