Inspection and service instructions – Aprilaire 220 User Manual
Page 10
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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.
OUTVET„
FITTING
SOLErJOlD-
VALVE
IN-LINE
STRAINER
OUTLET
COMPRESSION
NLTT
ORIFICE
(AJI Mod^s
— Except 445)
Inspection and
Service Instructions
1. Disconnect eiectrical 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 nai! 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 pouble Wrench
To Prevent Leaking).
9. Turn on water supply and reconnect electrical power to the furnace.
-INLET
FITTING
INLET
^COMPRESSION
NUT
8-