Aprilaire 800 Series Maintenance Instruction

Humidifier
WARNING
ELECTRIC SHOCK HAZARD. Disconnect main electrical power
to the humidifier at the circuit breaker and drain the water
from unit before servicing. Hot surface inside.
NOTICE
• Service should be performed by an HVAC technician.
• Use only genuine AprilAire replacement parts.
INSPECT HUMIDIFIER WHEN SERVICING
• Replace canister and O-ring annually
• Clean drain valve and fill valve screen annually
• Replace electrode wires every 3 years or as needed (see step
3 of CANISTER REPLACEMENT AND DRAIN VALVE SERVICE)
SERVICE SHUTDOWN PROCEDURE
1. Press On/Off button to turn humidifier off (see FIGURE 1).
2. Allow humidifier to drain.
3. When the green Drain light (see FIGURE 1) stops flashing,
disconnect main electrical power to humidifier at the circuit
breaker.
4. Allow the unit to cool.
5. Shut off water supply to unit.
FIGURE 1: STEAM HUMIDIFIER
3
4
1
2
5
1 - On/Off button and light
Drain light
2 -
Front panel
3 -
Side panel
4 -
Service light
5 -
MAINTENANCE INSTRUCTIONS
Series 800
Steam Humidifier
ONE WIRE MUST GO THROUGH
WATER LEVEL PROBE
CURRENT-SENSING TOROID
POWER POWER
RELAY RELAY
ELECTRODE
POST
POWER RELAY POWER RELAY
FIGURE 2A: TWO
CIRCUIT BOARDS
CANISTER REPLACEMENT AND DRAIN VALVE SERVICE
1. Remove front panel (see FIGURE 1).
2. Pull three wires off posts on top of canister (two electrode
wires and one water level probe wire, shown in FIGURE 2A
and FIGURE 2B).
3. Inspect the two electrode wires (see ELECTRODE WIRE
REPLACEMENT section for detailed instructions). Replace
them if they are:
• Not tightly fitting
• Damaged
• Over 3 years old or age is unknown
• Have D shaped connectors (see FIGURE 3A)
4. Loosen hose clamp at top of canister. Slide steam hose off
top of canister (see FIGURE 4).
FIGURE 3A:
"D" SHAPED
CONNECTOR
90-2352
CANISTER ELECTRODES CANISTER ELECTRODES
J8 J10 J8 J10
SINGLE PC BOARD SINGLE PC BOARD
FIGURE 2B: ONE
CIRCUIT BOARD
90-2352 90-2352
FIGURE 3B:
"O" SHAPED
CONNECTOR
90-2736