Aprilaire 800 Series - Electrode Wire Replacement; Fill Valve Service

FILL VALVE SERVICE
1. Disconnect water supply line from fill valve inlet (see FIGURE 9).
2. Remove in-line strainer from the fill valve inlet port using a #8 or #10 sheet
metal or wood screw with a minimum length of 0.5".
3. Clean or replace in-line strainer (Part #4004).
4. Reconnect water supply line to fill valve inlet (see FIGURE 9).
ELECTRODE WIRE REPLACEMENT
1. Remove front panel (see FIGURE 6).
2. Remove side panel (see FIGURE 6).
3. Remove the electrode wires (see FIGURE 7A and FIGURE 7B).
a. For units with one circuit board: Use needle nose pliers to pull the spade
connectors off spade terminals J8 and J10 on the circuit board.
b. For units with two circuit boards: Use needle nose pliers to pull the
spade connectors off the spade terminals on the power relay.
4. Ensure the two replacement electrode wires (Part #4978) have “O” shape
connectors (see FIGURE 8B). Do not use replacement wires with “D”
shape connectors (see FIGURE 8A).
5. Attach the new electrode wires (see FIGURE 7A and FIGURE 7B).
a. For units with one circuit board: Use a pair of needle nose pliers to
attach the spade connectors to the spade terminals J8 and J10 on the
circuit board. Electrode wires are interchangeable and can be placed on
either of the two terminals.
b. For units with two circuit boards: Use a pair of needle nose pliers to
attach the connectors to the spade terminals on the power relay. One
wire, either one but not both, must go through current-sensing toroid
(see FIGURE 7A). Electrode wires are interchangeable and can be placed
on either of the two terminals.
STEAM
OUTLET
DRAIN
SUPPLY
WATER
DRAIN CUP
DRAIN VALVE
DRAIN ASSEMBLY
ELECTRODES
WATER LEVEL PROBE
FILL
VALVE
OVERFLOW
FILL
STEAM HOSE
DISPERSION
TUBE IN DUCT
TUBELETS
CANISTER
FIGURE 9 – FILL & DRAIN SYSTEM AND CANISTER
90-1522
English 2524 English