Models 350 & 360 - Aprilaire 350 Owner's Manual

REQUIRED MAINTENANCE INSTRUCTIONS
(APRILAIRE HUMIDIFIER MODELS 350 & 360)
120 volts may cause serious injury from electrical shock. Disconnect
power and shut off water supply before servicing.
8
6
7
1. Note Manual Humidistat setting and turn dial to the "OFF" position.
2. Disconnect electrical power and turn off water supply.
3. Remove screws of the inlet grille (1). The grille can now be removed from the metal housing (8).
4. Lift the Water Panel evaporative assembly (9) out of the humidifier housing (8).
5. To remove the distribution tray (2) from Water Panel evaporative assembly (9), push down on
tray and pull out scale control insert (3). To clean the "V" openings of the tray, it will be
necessary to gently pry the distribution tray cover (4) from the tray. Follow instructions below
depending upon the type of distribution tray in your humidifier:
For trays with a synthetic fabric liner: 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.
For trays with granular coating: Do not scrape off the granular coating, but lightly scrape out
any mineral deposits and clean the "V" notches. This textured surface helps ensure even
water flow for maximum performance. See page 2 if removed.
6. Slide the Water Panel evaporator (5) out from the scale control insert (3). Clean the scale
control insert of mineral deposits. Replace the Water Panel evaporator (Stock No. 35) with a
Genuine Aprilaire Water Panel. Slide the Water Panel back into the scale control insert (3)
and snap the distribution tray cover (4) into the distribution tray (2). Then snap the distribution
tray back into the scale control insert.
7. Inspect the plastic feed 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 drain line from the bottom of the humidifier and flex it to loosen any mineral
deposits or blockage. Then flush it with water under pressure. If it does not properly clear,
replace it. Slip the drain line back onto the drain fitting (6). Make sure the drain line has a
constant downward slope and is not flattened or blocked.
9. Reinstall Water Panel evaporative assembly (9) and intake grille (1).
10. Reconnect electrical power (7) and turn on water supply.
11. Turn up Manual Humidistat and check system operation.
12. Set Manual Humidistat to its original position.
WARNING
1
- 10 -
4
2
9
5
3
1. Inlet Grille
2. Distribution Tray
3. Scale Control Insert
4. Distribution Tray Cover
5. Water Panel Evaporator
6. Drain Spud
7. Power Cord
8. Metal Housing
9. Water Panel
Evaporative Assembly