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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 continued proper unit performance.
VIII. PERIODIC PREVENTATIVE MAINTENANCE
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
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
compression nut.
7. For units with plastic feed tubes, inspect the 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 tube and make sure this small
opening is unplugged.
9. Replace the orifice and reconnect the outlet water line.
(Double Wrench To Prevent Leaking.)
10. Remove the drain hose from the bottom of the unit and flex it to remove any
mineral deposits or blockage. Flush the hose with water under pressure to
clear it of any debris. 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.
INSPECTION AND SERVICE INSTRUCTIONS
HUMIDIFIER CONTROL:
Humidifiers controlled by the Humidifier Control require no control
adjustment. Shut off the water supply to the humidifier by closing the
saddle valve.
MANUAL HUMIDISTAT:
For humidifiers controlled by a manual humidistat, simply turn the
humidistat to the “Off” position. Shut off the water supply to the
humidifier by closing the saddle valve.