APRILAIRE #4040 REPLACEMENT SOLENOID VALVE.

Aprilaire #4040 replacement solenoid valve.
• 24 VAC
• 2.3 Watts
Replacement solenoid value for Aprilaire Humidifier models 220, 224, 400, 440, 500, 550, 558, 560, 568, 600, 700, 760, 768. The #4040 soleniod valve includes a new inline strainer (pre-inserted in inlet side of valve), and a compression nut & washer for the inlet side only.*********

Solenoid Valve Replacement
Instructions
1. For power units unplug electrical cord. For bypass units turn off power to furnace. Also turn the humidistat off.
2. Shut off water supply at the saddle valve
3. Disconnect inlet and outlet water compression nuts. Double wrench. Note, some water may drip on floor. Remove the orifice (which controls the water flow) from the plastic or copper tube and make sure there is no obstruction. If blocked clean or replace.
4. Remove the wire nuts from the water solenoid valve wire connections. Set aside.
5. Remove screws that secure valve to unit.
6. Attach new valve with screws. Do not over-torque screws into plastic housing.
7. Reconnect wires with wire nuts.
8. For units with plastic feed tubes inspect for brittleness, hairline cracks, nicks or abrasions, etc. Replace if necessary.
9. Reconnect the water lines, double wrenching the compression nuts.
10. Turn water back on and check system for leaks. Tighten compression nuts as necessary.
11. Restore electrical service and activate furnace by turning up the thermostat.
12. Turn up humidistat to verify operation of humidifier. Recheck for leaks. Turn down humidistat to make sure valve shuts off. Reset humidistat and thermostat to original levels.
also fits in
Replacement solenoid for many brands/models of whole house humidifiers. Same as Aprilaire 4040.

Bryant:
HUMBBSBP2412-A27
HUMBBLBP2417-A24
HUMBBLFP1418-A24
HUMBBWBP2417-A24

Carrier:
HUMCCSBP2412-A27
HUMCCLBP2417-A24
HUMCCLFP1418-A24
HUMCCWBP2417-A24

Totaline:
P110-SBP2412
P110-LBP2417
P110-LFP1418

ICP:
HMICSB12B
HMICLB17B
HMICLF18B

Lennox:
HCWB3-12
HCWB3-17
HCWP3-18
HCWB3-12A
HCWB3-17A
HCWP3-18A

Trane:
THUMD200ABM00BA
THUMD300ABA00BA
THUMD500APA00BA

American Standard:
AHUMD200ABM00BA
AHUMD300ABA00BA
AHUMD500APA00BA

Nordyne:
9178970
9178630
9178640

Maytag:
9181270
9181280
9181290

York:
S1-BP5000MY
S1-BP6000MY
S1-FP7000MY

Coleman:
S1-BP5000MC
S1-BP6000MC
S1-FP7000MC

Luxaire:
S1-BP5000ML
S1-BP5000ML
S1-BP6000ML
S1-FP7000ML