Wiring seems ok, but digital reading is 35%. Turning the control, the humidifier is on only when the nob is turned to reset position. Then humidifier runs for only seconds and the humidifier light starts to blink and unit shuts off. Is it a relay problem?
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It appears your Aprilaire model 700 is wired to only operate when your HVAC fan is operated by your thermostat. Your HVAC installer can wire the humidifier control to operate the humidifier during a heat call, fan call or to turn on the fan when there is a need for humidification. Please contact your HVAC installer to have them change the wiring.
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Aprilaire Humidifier is designed to operate in conjunction with your furnace
blower motor. Most installers wire a humidifier to operate when the furnace is
calling for heat. To determine if your Aprilaire Humidifier is maintaining
proper humidity, turn up the heat temperature 5 degrees above the current room
temperature on your thermostat and set your humidifier control to call for
humidity. The humidifier control is located on the cold air return duct.To set your humidifier control to call for
humidity, turn the control dial to the off position and slowly rotate the dial
until you hear a “click” on the control.You should also hear a click at the solenoid valve located on your
Aprilaire unit.The humidifier control
will have a click point at the current relative humidity level in your home. If
the current relative humidity is 45% or the outdoor temperature is above 60F,
the control will only operate the humidifier in the test mode.
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No click at the solenoid valve indicates
an electrical problem.Contact your
heating and air conditioning dealer to further check the electrical
components of your Aprilaire Humidifier.
The click sound at the solenoid valve
indicates there is electricity to the solenoid valve.By turning the dial of your humidifier
control to a setting above the “click point” you should see water coming
out of the drain line within a few minutes which would indicate your
humidifier is working.
If the solenoid valve makes a click
sound and there is no water draining from the unit, this would indicate
the flow of water is being obstructed.
determine if water flow is being obstructed, turn the dial of your humidifier
control to the off position.The first
location you would want to check for an obstruction would be at the saddle
valve located on the water line supplying water to the humidifier. When
checking the saddle valve, you want to make sure it is completely open.This can be done by turning the valve all the
way to the left.If anything is clogged,
it can be dislodged by turning the saddle valve all the way to the right and
back to the left.Once this is done,
turn the humidifier control dial above the click point and you should see water
coming out the drain line. If water is still not
coming out of the drain, check the orifice and in-line strainer to make sure
they are not clogged.The orifice is
located in the tube on the discharge side of the solenoid valve and the in-line
strainer is located on the inlet side of the solenoid valve. You may clear the orifice by inserting a
needle through the small opening.Clean
the strainer by running it under warm water to dislodge deposits or replace.After clearing and re-installing the orifice
and strainer (be sure to double wrench all water connections), turn the humidifier
control dial above the click point and you should see water coming out the
unless the humidty in your home is higher then 35%. if it is then the humidifier would not run. try turning it up higher and see if it comes on. Do you hear a click in the humidistat? as you turn up the dail when you hear the click is when the humidifier should come on. Also remember your furnace must be running for the humidifier to come on. if you hear the click and the humidifier fan comes on but no water, you may have a clogged inline filter located in the solinoid valve or a bad soliniod. all parts for your humifier can be purchased from www.aprilaire.com
yes it should be bypass but solenoid could be trying to open but the voltage to it may be to low if you have 24v ac power at the 2 small wires. but to change shut down power to furnace and water to humidifier.you loosen the 2 compression nuts unwire they cant be reversed so dont worry then 2 mounting screws then reverse to install
you need to make sure your humidity level in the house isnt higher then what your humidifier will provide at any givin outdoor temp. this chart is in the owners manual. you cant remove the wires going to the ODS or it will give an error unless you have a resistor to put in its place. Anyway if the humidifier works in test mode according to AA it works so you may have higher humidity than you think, the highest your gonna get is 45% as the temp outside drops it will allow less humidity so it doesnt cause window condinsation (property damage) here is a copy of the chart. the #s on the left are the dial setting
TABLE 2 – % Relative Humidity Guide
Outdoor Temperature (°F)
-10°F 0°F 10°F 20°F 30°F 40°F
1 10% 10% 10% 15% 20% 25%
2 10% 10% 15% 20% 25% 30%
3 10% 15% 20% 25% 30% 35%
4 15% 20% 25% 30% 35% 40%
5 20% 25% 30% 35% 40% 45%
6 25% 30% 35% 40% 45% 45%
7 30% 35% 40% 45% 45% 45%
you can bypass the humidistat by shorting the 2 brown wires on the bottom of the humidifier. just remove the 2 wire nuts and touch the 2 together (just 24v)if it comes on then there is a control problem with the humidistat or wiring if it doesnt come on the control board or transformer may be bad or you dont have 120v to the humidifier on the plug. also make sure your furnace blower is running cause the hum cant come on if its wired properly unless the fan is running. you also may want to go to www.aprilaire.com and get a maintenace kit from their online store. it comes with pad and new hose along with a couple other things.
do you hear a clicking at the solinoid? grab the solinoid and turn it on to see if its getting voltage, you should feel it energize. you can turn off the water supply and disconnect the water line from the solinoid. there is a black pre screen inside the inlet if you have a tiny flat heat screwdriver insert it into the inlet and turn it out. clean it and retry. you can also make sure the orifice isnt clogged its located on the outlet side of the soliniod. when you remove you will probably have a stream of water come out of the feed tube thru the orifice, even if it has sat all summer. if water comes out you dont have a clogged orifice. donot try to **** out the orifice if its clogged you will need to get a new one fron www.aprilaire.com . you can verify it clogged by after cleaning the prescreen reconnect the water line inlet and turn on humidifier if water comes thru the solinoid with the outlet feed tube not connected then the orifice is clogged. If you clean the prescreen and the orifice is fine ,still no water then you will need a new solinoid you should also be able to purchase from aprilaire. here is links to the solinoid and orifice
I'm no expert, but those who are seem to agree that the first thing to check is your evaporator panel. Aprilaire recommends replacing it annually--so if you haven't replaced it recently, that would be the first step to take. Next, check the power supply to your Aprilaire unit. Turn the humidistat to 0%, and then turn it slowly back toward 35% until you hear a click at the unit. If you don't hear a click, you'll want to check that the unit is in fact getting electric power (you may want to get an electrician or furnace tech to do this). If you do hear the click, the next thing to check is whether you have sufficient water flow to your Aprilaire unit. On mine, I had to adjust my water supply saddle valve, as well as the inline valve on the discharge side of the solenoid (see prior post from this morning)--and this seemed to clear the lines and restore water flow. Once you achieve proper water flow, you will probably want to set your humidistat at 35% for winter temps of around 20 degrees F--but be sure to adjust it downward for colder weather. Comments, anyone?
See if you have a screw marked EAC This to power an Electronic Air Cleaner unlike the HUM it also gets 120VAC only when the fan comes on. Not sure what make of furnace you have but if your heat is working OK don'tn change the control board the can be very expensive. there are other ways to wire humidifiers without using the HUN screw