Aprilaire 110 owner manual VIII. Periodic Preventative Maintenance

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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.

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, 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.

INSPECTION AND SERVICE INSTRUCTIONS

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.

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Contents Humidifiers Table of Contents Introduction Principle of Operation Page Operation Guide Automatic Mode Manual Mode-see pgDial % Relative Humidity GuideOutdoor-Indoor Relative Humidity Manual Mode Automatic Mode see pgIV. Additional INFORMATION- ALL Models Effect of Water CharacteristicsVII. Annual Summer Shutdown VI. Annual MaintenanceVIII. Periodic Preventative Maintenance Models Clip Inlet Grille Property damage. Turn Setting before servicing448 Models 445-448 Reservoir Pump Sections Set humidistat or Control to its original position Front Cover Base Evaporative Assembly Thank you
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