Periodic Preventative Maintenance - Aprilaire 400 Owner's Manual

VIII. PERIODIC PREVENTATIVE MAINTENANCE
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.
INSPECTION AND SERVICE INSTRUCTIONS
IN-LINE
STRAINER
6. Disconnect the water line at the outlet compression nut.
7. Remove the orifice from the copper or plastic 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.
OUTLET
COMPRESSION
NUT
ORIFICE
SOLENOID
VALVE
INLET
INLET
COMPRESSION
NUT
- 10 -
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. Replace the in-line strainer
and reconnect the inlet water
line. (Double Wrench To
Prevent Leaking.)