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- The 4040 Aprilaire Water Solenoid Valve is a brand new genuine Aprilaire humidifier part.
- The Aprilaire humidifier water solenoid valve 4040 pictured below is the exact replacement valve for Aprilaire Humidifier Models: 220, 224, 400, 440, 550, 558 560, 568, 600, 700, 760 768.
- The purpose of the Aprilaire 4040 water solenoid valve is to shut the water off and on which goes into your Aprilaire home humidifier. When the valve receives 24 volts AC the valve opens and water flows into your humidifier.
- The 4040 Aprilaire Water Solenoid Valve is the replacement valve for Bryant Carrier part #4374 and 4357.
- Please note, this is a 24-volt valve. All 4040 valves come with a 4004 strainer installed on the inlet side of the valve. You do not need to purchase a 4004 strainer.
- The 4040 Aprilaire Water Solenoid Valve comes from the Aprilaire Research Products factory in a sealed plastic bag.
- Please email us anytime if you have a question. Our email address is: email@example.com
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Solenoid Valve Replacement Instructions:
- For power units unplug electrical cord. For bypass, units turn off power to furnace. Also, turn the humidistat off.
- Shut off the water supply at the saddle valve
- Disconnect inlet and outlet water compression nuts. Double wrench. Note, some water may drip on the 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.
- Remove the wire nuts from the water solenoid valve wire connections. Set aside.
- Remove screws that secure the valve to the unit.
- Attach a new valve with screws. Do not over-torque screws into the plastic housing.
- Reconnect wires with wire nuts.
- For units with plastic feed, tubes inspect for brittleness, hairline cracks, nicks or abrasions, etc. Replace if necessary.
- I would highly recommend completing this step while the humidifier water supply line is disconnected to clean out the supply line/saddle valve and make sure that you have a good flow of water coming out of the water supply line. Many times a new valve can become stopped up if this step is not completed. This can be accomplished by taking a bucket, setting the loose humidifier water supply line down into the bucket (two people are best), then turn on the saddle valve to get all loose sediment out of the saddle valve and the waterline. This can be accomplished by allowing the water to run into the bucket for 10 to 15 seconds. If you can not get adequate water flow out of your saddle valve then you will need to replace your saddle valve. We sell a really good Supco saddle valve on the following page: Please click here for the saddle valve we recommend.
- Reconnect the water lines, double wrenching the compression nuts.
- Turn the water back on and check the system for leaks. Tighten compression nuts as necessary.
- Restore electrical service and activate furnace by turning up the thermostat.
- Turn up humidistat to verify the operation of the humidifier.
- Recheck for leaks. Turn down humidistat to make sure the valve shuts off. Reset humidistat and thermostat to original levels.