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C
D
E
B
H
I
A
G
F
A. Humidier Cover Assembly
B. Base Assembly
C. Water Panel Evaporative Assembly
D. Distribution Tray
E. “V” Notches
F. Water Panel 35
G. Scale Control Insert
H. Drain Line
I. Power Cord
1. Note humidier control set point and turn dial to the OFF position.
2. Disconnect electrical power and turn off water supply.
3. Unlatch humidier front cover assembly (A) from base assembly (B) at the bottom of
the cover, lift, and set aside.
4. Pull out the Water Panel evaporative assembly (C) by grasping at the top and tipping out.
5. Unsnap the distribution tray (D) from the scale control insert (G). Lightly scrape out or
brush off any mineral deposits, being careful not to stretch or loosen the synthetic fabric
liner. Soaking the tray in vinegar or a lime-removing agent is helpful when trying to
remove stubborn mineral deposits.
6. Slide the Water Panel (F) out from the scale control insert (G) and dispose of the Water
Panel. Clean the scale control insert of mineral deposits. Replace with a genuine
AprilAire Water Panel 35. Slide the Water Panel back into the scale control insert with the
colored spot up and snap the distribution tray (D) back into place.
7. Inspect the plastic feed tube by gently exing it and looking for cracks or signs of wear.
Replace tube if it is cracked, brittle, or has been damaged.
8. Reinstall the Water Panel evaporative assembly (C) into the humidier by tting its drain
into the round receptacle at the base of the humidier. Push the assembly in at the top
between the retaining ribs that hold the assembly in place in a vertical position.
9. Remove the drain line (H) from the bottom of the humidier. If applicable, ex it to loosen
any mineral deposits or blockage. Then ush it with water under pressure. If it does not
clear, replace it. Slip drain line back onto the drain tting. Make sure the drain line has a
constant downward slope and is not attened or blocked.
10. Reinstall front cover assembly (A) by hooking at the top of the base assembly (B) and
latching at the bottom.
11. Reconnect electrical power (I) and turn on the water supply.
12. Check system operation:
Manual Humidier Control (Model 700M): With the HVAC system fan operating, turn up
humidier control and check system operation.
Digital Humidier Control (Model 700): (Automatic or Manual mode) Check system
operation and reset Change Water Panel indicator by setting the knob to Test/Reset.
With HVAC system fan operating and thermostat calling for heat, humidier will operate
for one minute. DO NOT LEAVE IN TEST MODE AS HUMIDIFIER WILL NOT OPERATE.
13. Set humidier control dial to its original set point.
NOTE: The motor is permanently lubricated and does not need to be oiled.
REQUIRED MAINTENANCE INSTRUCTIONS
APRILAIRE HUMIDIFIER MODELS 700 & 700M
WARNING
ELECTRIC SHOCK HAZARD: 120 volts may cause serious injury from
electric shock. Disconnect electrical power and water before servicing.
Leave power and water disconnected until service is completed.
90-1075
MODEL 700 SERIES
19
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