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1. Disconnect electrical power
to the furnace and shut off water
supply.
2. Disconnect the water line at the
inlet compression nut.
3. Remove the in-line strainer from
inside the inlet side of the valve
by using a small
nail or wire.
4. Flush the in-line strainer
clean or replace with a new
strainer, Service Department, Part
No. 4004.
5. Reconnect the inlet water line.
(Double Wrench To Prevent
Leaking.)
6. Disconnect the water feed tube
at the outlet compression nut.
7. Inspect the water feed tube by
gently flexing it and looking for
cracks or signs of wear. Replace
tube if it is cracked, brittle, or
has been damaged.
8. Remove the orifice from the copper or plastic water feed tube and make
sure this small opening is unplugged.
9. Replace the orifice and reconnect the water feed tube.
(Double Wrench To Prevent Leaking.)
10. Remove the drain hose from the bottom of the unit and flex it to loosen
any mineral deposits or blockage. Then flush it with water under
pressure and slip it back onto the drain fitting. Make sure the drain hose
has a constant downward slope and is not flattened or blocked.
11. Turn on water supply and reconnect electrical power to
the furnace.
OUTLET
COMPRESSION
NUT
ORIFICE
INLET
INLET
COMPRESSION
NUT
SOLENOID
VALVE
IN-LINE
STRAINER
INSPECTION AND SERVICE INSTRUCTIONS
NOTE: Periodic inspection and preventative maintenance of your total
heating system is important for efficient and safe operation. Your heating
contractor should include humidifier service at the same time.
All models are equipped with an in-line water strainer and orifice as
shown below. These parts should be inspected and cleaned periodically to
assure continued proper unit performance.
WATER FEED
TUBE
TABLE OF CONTENTSVIII. PERIODIC PREVENTATIVE MAINTENANCE