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Inspection and
Service Instructions
1. Disconnect electrical power to the furnace
and shut off water supply.
2. Disconnect the water line at the inlet com-
pression nut.
3. Remove the in-line strainer from inside the
inlet fitting 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. Replace the in-line strainer and reconnect
the inlet water line (Double Wrench To
Prevent Leaking).
6. Disconnect the water line at the outlet com-
pression nut.
7. Remove the orifice from the copper or plas-
tic tube and make sure this small opening is
unplugged.
8. Replace the orifice and reconnect the outlet water line (Double Wrench
To Prevent Leaking).
9. Turn on water supply and reconnect electrical power to the furnace.
VI. PERIODIC PREVENTATIVE MAINTENANCE
NOTE: Periodic inspection and preventive 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, except No’s. 448 and 445, are equipped with
an in-line water strainer and orifice as shown below. These parts
should be inspected and cleaned periodically to assure contin-
ued proper unit performance.