Set Humidifier Control to its original position

MODEL 600

MAINTENANCE INSTRUCTIONS for

APRILAIRE HUMIDIFIER MODEL 600

CAUTION! Sudden operation may cause personal injury or property damage. Turn Humidifier Control to “off” or lowest setting before servicing.

1.Front Cover

2.Feed Tube

3.Integral Damper

4.Water Panel Evaporator Assembly

5.Distribution Tray

6.“V” Notches

7.Water Panel

8.Scale Control Insert

9.Drain Hose

1.Note Humidifier Control setting and turn dial to the “OFF” position.

2.Turn off water supply.

3.Press the tabs in the latches on the top and bottom of front cover (1) and pull cover off base with both hands. Set aside.

4.Carefully pull the plastic feed tube (2) out of the distribution tray (5) at the top of the Water Panel evaporator assembly (4). Pull this assembly out by grasping at top and tipping out.

5.Remove the distribution tray (5) from the water panel evaporator assembly by lifting straight up from the scale control insert (8). Lightly scrape out any calcium deposits and clean the “V” notches (6) but do not scrape off the granular coating from the bottom. This textured surface helps ensure even water flow for maximum performance. See page 3 if removed.

6.Slide the Water Panel evaporator (7) out from the Scale Control Insert (8). Clean the insert frame of calcium deposits with a putty knife. Inspect Water Panel evaporator (Stock No. 35 for Model 600) and substitute a new Genuine Aprilaire Water Panel if necessary. Slide the Water Panel back into the scale control insert with the colored spot up and snap the distribution tray back into place.

7.Re-install the Water Panel evaporator assembly into the unit by fitting its drain into the round receptacle at the base of the unit. Push the assembly in at the top against the beveled tabs that will hold it in place. Push the end of the feed tube back firmly into the distribution tray and replace the front cover.

8.Remove the drain hose (9) from the bottom of the unit and bend and flex it to loosen the internal calcium deposits. Then flush it with water under pressure and slip it back onto the drain fitting.

9.Turn on the water supply.

10.Check system operation:

Humidifier Control: (Automatic or Manual) Check system operation and reset change water panel indicator by setting the knob to “Test/Reset”. With furnace blower operating and furnace calling for heat, humidifier will operate for one minute. DO NOT LEAVE IN TEST MODE AS HUMIDIFIER WILL NOT OPERATE.

11.Set Humidifier Control to its original position.

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