Aprilaire 800 Series - Canister Replacement and Drain Valve Service

CANISTER REPLACEMENT AND DRAIN VALVE SERVICE
1. Remove front panel (see FIGURE 6).
2. Pull three wires off posts on top of canister (two electrode wires and one
water level probe wire, shown in FIGURE 7A and FIGURE 7B).
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 8A)
4. Loosen hose clamp at top of canister. Slide steam hose off top of canister
(see FIGURE 9).
5. Slide canister up and out of drain assembly (see FIGURE 9). Discard old
canister.
6. Remove O-ring from drain assembly using small screwdriver. Discard old
O-ring.
7. With your finger, swirl the fluid/precipitate mixture in the bottom of the
drain valve reservoir (see FIGURE 9).
J8 J10
CANISTER ELECTRODES
POWER
RELAY
WATER LEVEL
PROBE
ELECTRODE
POST
FIGURE 7A – TWO CIRCUIT BOARDS
FIGURE 8A –
“D” SHAPED CONNECTOR
FIGURE 7B – ONE CIRCUIT BOARD
FIGURE 8B –
“O” SHAPED CONNECTOR
90-2352
90-2736
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. Insert new O-ring (Part #5258) into slot in drain assembly. Dampen O-ring
with water before inserting canister. Do not use oil, grease, or any lubricant
besides water.
12. Make sure strainer is inserted into bottom of new canister.
13. Insert new canister into drain assembly (see FIGURE 9).
14. Slip steam hose over top of canister and tighten hose clamp
(seeFIGURE9).
15. Reconnect the electrode wires and water level probe wire to the posts on
top of the canister (see FIGURE 7A and FIGURE 7B). Electrode wires are
interchangeable and can be placed on either of the two electrode posts on
top of the canister. Ensure connectors are fully seated.
English 2322 English