Models 600 & 600M; Models 700 & 700M; Models 500 & 500M - Aprilaire 350 Safety & Operating Instructions Manual

REQUIRED MAINTENANCE INSTRUCTIONS
(APRILAIRE HUMIDIFIER MODELS 500, 500M, 600 & 600M)
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
1
3. Integral Bypass Damper
4. Water Panel Evaporative
Assembly
5. Distribution Tray
6. "V" Notches
7. Water Panel Evaporator
8. Scale Control Insert
9. Drain Line
1. Note Humidifier Control setting and turn dial to the "OFF" position.
2. Turn off water supply. Turn the integral bypass damper (3) to the SUMMER position.
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
evaporative assembly (4). Pull this assembly out by grasping at top and tipping out.
5. Unsnap the distribution tray (5) from the scale control insert (8). 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 evaporator (7) out from the scale control insert (8) and dispose of the Water Panel.
Clean the scale control insert of mineral deposits. Replace the Water Panel evaporator (Stock No. 35 for
Models 600 & 600M and Stock No. 10 for Models 500 & 500M) with a new Genuine Aprilaire Water
Panel. Slide the Water Panel evaporator back into the scale control insert with the colored spot up and
snap the distribution tray (5) back into place.
7. Inspect the plastic feed tube (2) by gently flexing 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 (4) into the humidifier by fitting its drain into the round
receptacle at the base of the humidifier. Push the assembly in at the top until it snaps into place. Push
the end of the feed tube back firmly into the distribution tray and replace the front cover.
9. Remove the drain line (9) from the bottom of the humidifier. If applicable, 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 drain line back onto the drain fitting. Make sure the drain line has a constant downward slope and
is not flattened or blocked.
10. Turn on the water supply. Return integral bypass damper to appropriate position.
11. Check system operation:
Manual Humidifier Control (Models 500M & 600M): With the HVAC blower operating, turn up
Humidifier Control and check system operation.
Digital Humidifier Control (Models 500 & 600): (Automatic or Manual mode) Check system
operation and reset Change Water Panel indicator by setting the knob to "Test/Reset". With HVAC
blower operating and HVAC calling for heat, humidifier will operate for one minute. DO NOT LEAVE IN
TEST MODE AS HUMIDIFIER WILL NOT OPERATE.
12. Set Humidifier Control to its original position.
4
5
8
6
7
3
9
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REQUIRED MAINTENANCE INSTRUCTIONS
(APRILAIRE HUMIDIFIER MODELS 700 & 700M)
ELECTRICAL SHOCk HAzARD. Can cause injury or death. Disconnect all
electrical power supplies before servicing. Turn Humidifier Control to "OFF" or
lowest setting before servicing.
1. Humidifier Cover Assembly
2. Base Assembly
3. Water Panel Evaporative
Assembly
4. Distribution Tray
5. "V" Notches
6. Water Panel Evaporator
2
7. Scale Control Insert
8. Drain Line
9. Power Cord
90-1076
1. Note Humidifier Control setting and turn dial to the "OFF" position.
2. Disconnect electrical power and turn off water supply.
3. Unlatch humidifier front cover assembly (1) from base assembly (2) at the bottom of the cover, lift, and
set aside.
4. Pull out the Water Panel evaporative assembly (3) by grasping at the top and tipping out.
5. Unsnap the distribution tray (4) from the scale control insert (7). 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 evaporator (6) out from the scale control insert (7) and dispose of the Water Panel.
Clean the scale control insert of mineral deposits. Replace the Water Panel evaporator (Stock No. 35)
with a new Genuine Aprilaire Water Panel. Slide the Water Panel evaporator back into the scale control
insert with the colored spot up and snap the distribution tray (4) back into place.
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. Reinstall the Water Panel evaporative assembly (3) into the humidifier by fitting its drain into the round
receptacle at the base of the humidifier. 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 (8) from the bottom of the humidifier. If applicable, flex it to loosen any mineral
deposits or blockage. Then flush it with water under pressure. If it does not clear, replace it. Slip drain
line back onto the drain fitting. Make sure the drain line has a constant downward slope and is not
flattened or blocked.
10. Reinstall front cover assembly (1) by hooking at the top of the base assembly (2) and latching at the
bottom.
11. Reconnect electrical power (9) and turn on the water supply.
12. Check system operation:
Manual Humidifier Control (Model 700M): With the HVAC blower operating, turn up Humidifier
Control and check system operation.
Digital Humidifier 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 blower operating
and HVAC calling for heat, humidifier will operate for one minute. DO NOT LEAVE IN TEST MODE AS
HUMIDIFIER WILL NOT OPERATE.
13. Set Humidifier Control to its original position.
NOTE: The motor is permanently lubricated and does not need to be oiled.
WARNING
3
5
4
7
1
6
8
9
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2
90-1075