MAINTENANCE INSTRUCTIONS for
MODELS 445-448 RESERVOIR PUMP SECTIONS
WARNING! 120 volts may cause serious injury from electrical shock. Disconnect power and shut off water supply before servicing.
IMPORTANT: Clean and refill reservoir, hose, pump and float every 30 days during heating season.
1.Pump Impellor Cap
2.Cap Sides
3.Impellor
4.Cap Flow Control Opening
5.Float
3 | 6. Arm Mechanism |
MODELS 445-448
22
5
4 
1
6
A. TO CLEAN RESERVOIR
1.Hold bottom of reservoir (IT IS FILLED WITH WATER) and loosen retainer knob. Carefully lower reservoir, disengaging from metal frame.
2.Empty water, remove partition and reservoir liner.
3.Clean or replace reservoir liner. Reinstall partition in liner. To replace reservoir, hook back of reservoir over lip of dark metal frame and tighten knob.
B. TO CLEAN HOSE
1.Disconnect hose from pump and pull hose up through hole.
2.Flex hose to loosen scale and flush clean with a stream of water.
3.Clean nozzle at the same time.
C. TO CLEAN PUMP
1.Remove pump impellor cap (1) by pushing down on projecting sides (2).
2.Clean scale from inside of cover and impellor (3) with dull blade.
3.Clean flow control (4) in pump outlet with 5/32” bit.
4.Snap pump impellor cap (1) back in place.
5.Pull water hose down through hole, connect to pump, and attach nozzle into water distribution tray.
D. TO CLEAN FLOAT
1.Clean scale off float (5) and arm mechanism (6) with dull blade.
2.Work arm mechanism (6) up and down to dislodge any scale buildup.
E. TO OIL MOTOR
1.Disconnect water line at valve inlet and swing line free. Disconnect the humidistat leads.
2.Remove the three screws from the brown motor cover and remove.
3.Use two drops SAE 20 oil in the yellow hole on top and inside the yellow mark on the side of the motor.
F. TO REASSEMBLE
1.Replace motor cover.
2.To reinstall reservoir, hook back of reservoir over lip of dark brown metal frame and tighten knob.
3.Reconnect water at valve inlet.
4.To reinstall top cover, hook back under lip of dark brown metal frame and tighten two knobs.
5.Reconnect humidistat or control leads and electrical power.
6.Turn on water supply and fill reservoir in the fall.
7.Check unit operation.
8.Check system operation:
Manual Humidistat: Turn up humidistat to highest setting and make sure the furnace blower is operating. Humidifier will operate if RH is less than 50%. Humidifier Control: Check system operation by setting the knob to “Test.” With furnace blower operating and furnace calling for heat, humidifier will operate for one minute.
9.Set humidistat or Control to its original position.
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