MaInTenanCe
Inspect humidifier when servicing .
• Check system operation and inspect all plumbing connections and piping for signs of cracks or leaks.
• Inspect drain line to make sure it is not blocked and has constant downward slope. Clean or replace if necessary.
• Inspect steam hose to make sure it has no low spots and has constant upward slope from humidifier to dispersion tube in duct. If dispersion
tube is mounted below humidifier, inspect drip tee and drain .
Replace the canister annually and when prompted by the
“Service” light . Use Only Genuine Aprilaire Model 80 Canister .
1 . Press On/Off switch to turn humidifier off .
2 . Allow humidifier to drain . When the green Drain light stops
flashing, disconnect main electrical power to humidifier .
3 . Remove front panel .
4 . Pull three wires off posts on top of canister . (Two large electrode
conductors and one water level probe conductor .)
5 . Loosen hose clamp at top of canister .
6 . Slide hose off top of canister .
7 . Slide canister up and out of drain assembly . Discard canister .
8 . Remove O-ring from groove in drain assembly using small screw
driver .
9 . Inspect drain assembly and remove any debris .
10 . Insert new O-ring into groove in drain assembly . (O-ring is
provided with Model 80 canister .) Dampen O-ring with water
before inserting canister . Do not use oil, grease, or any lubricant
besides water .
11 . Make sure strainer is inserted into bottom of new canister .
12 . Insert canister into drain assembly . Position canister with label
facing outward .
13 . Slip steam hose over top of canister and tighten hose clamp .
14 . Reattach and fully seat three wires to posts on top of canister .
(Larger electrode conductors are interchangeable .)
15 . Replace front panel .
16 . Restore electrical power to humidifier .
17 . Turn humidifier on and verify green On/Off light is illuminated .
18 . See Start-up procedure .
To RePlaCe THe CanISTeR
To SeRVICe THe fIll ValVe
If water flow from the valve is restricted:
1 . Disconnect the inlet fitting and remove in-line strainer from the
inlet port using a small screw . Clean or replace strainer (part
#4004) .
2 . Disconnect the outlet fitting and remove, inspect and clean the
orifice .
CaUTIon
• Allow humidifier to drain and disconnect power before servicing.
• Service should be performed by a qualified HVAC technician.
To Clean THe DRaIn ValVe
1 . Turn unit off at membrane switch .
2 . Unit will go through drain cycle – 4 mins – and turn off when
complete .
3 . Disconnect main electrical power to humidifier at the circuit breaker .
4 . Allow the unit to cool .
5 . Remove front door .
6 . Remove electrode wires, high water probe wire, steam hose and
canister .
7 . With your finger swirl the fluid/precipitate mixture in the bottom of
the drain valve reservoir .
8 . Using a sponge or paper towels soak up the water in the reservoir,
if necessary use a wet/dry vacuum to remove residue .
9 . Clean the inside of the drain port (where coil projects out) by gently
swabbing with a bent cotton swab or other soft implement .
10 . Rinse the drain valve reservoir with clean water and vacuum as
necessary .
11 . Replace canister, reconnect steam hose and wires ensuring wires
are fully seated .
12 . Replace door .
13 . Restore power .
14 . Turn unit ON .
15 . Check for leaks .
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