Aprilaire 700, 600, 550 owner manual VIII. Periodic Preventative Maintenance

VIII. 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 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

OUTLET COMPRESSION NUT

ORIFICE

SOLENOID

VALVE

INLET

INLET COMPRESSION NUT

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.)

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.

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