Explore answers about Humidistat

I have two furnaces with humidifiers the solenoid is

I have two Bryant furnaces with humidifiers the solenoid is connected to the HUM and Com terminals as shown in the wiring diagram but when the blower is running the solenoid is not powering up? I tested the solenoid with a 24vac transformer and the solenoid works fine. Any suggestions appreciated.JA: Did you check the furnace's filters?Customer: Furnace filters are new but I dont see the connection between the two?JA: Do you plan on doing the work yourself?Customer: I am a certified electrician so do not see the need to hire someoneJA: Anything else we should know to help you best?Customer: Both furnaces are less than a year old and the units were set up by HVAC supplier don't know if the humidifiers ever worked, having problems with hardwood floors which drove eme to check humidity

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BillyHvac

Journeyman Service Technician

State Licensed Mechanical Contractor

12,368 satisfied customers
I just installed an Aprilaire 500 humidifier. When it is

I just installed an Aprilaire 500 humidifier. When it is turned on the unit clicks repeatedly until the furnace blower comes on. In addition, once the furnace turns off the fan continuously goes on and off in short bursts until the furnace comes on again for another cycle. I checked the wiring a number of times with the instillation diagram and cannot see a problem. with the connections or in theJA: Did you check the furnace's filters?Customer: yes... they are newJA: Do you plan on doing the work yourself?Customer: yesJA: Anything else we should know to help you best?Customer: not that I can think of at this point

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BillyHvac

Journeyman Service Technician

State Licensed Mechanical Contractor

12,368 satisfied customers
Had two Goodman furnaces installed with two new powered

Had two Goodman furnaces installed with two new powered Aprilaire humidifiers that are not activating when either blower, induction or main blower, turn on. Since I had the older 110 controls mounted in the return ducts, we decided to use them instead of connecting the digital controls with additional wiring instead of the 6 wires (24VAC, A/A and temp sensor) on the older control. THe installer (in the spring) hooked up the solenoid leads to the HUM in and HUM out connections on the Goodman, ran the thermostat 4 wires to the proper terminals, and ran the A/A to the C and the jumped Y1 Y2. If I am reading the instructions properly from the older controllers, this doesn't appear correct. Any suggestions?JA: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?Customer: No, the units have worked perfectly from April to now, and continue to do so. Both units were wired with the new Aprilaire and neither operate properly. THe instructions that come from Goodman are quite vague, specifically when they indicate that 24 VAC needs to get to the HUM in. Does that mean wiring from the R to the HUM IN? Then does the Hum out go to the solenoid? Where does the other lead from the solenoid go?JA: Do you plan on doing the work yourself?Customer: I usually can troubleshoot something like this myself, but I like to have clarity of instruction from the manufacturers and a reasonable schematicJA: Anything else we should know to help you best?Customer: Nothing that I can think of at the moment

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D.E. Anderson

Industrial Refrigeration Service Manager

342 satisfied customers
Thanks. My solenoid for the humidifier is not getting any

Thanks. My solenoid for the humidifier is not getting any current from the humidistat. I opened up the humidistat and there are no wires going into the humidistat, only wires coming out. So how does it supply the 24v required, I looked around and there is no place to put any other wires, only those that come out that are connected to the two screw on the top.JA: I'll do all I can to help. How long have you been dealing with this?Customer: We just bought this house last nov and the humidifier is not working since then.JA: Do you plan on doing the work yourself?Customer: Yes.JA: Anything else we should know to help you best?Customer: probably this is it. there is one brown wire that appears to be coming from the furnace, not connected anywhere, just taped off. Did not check current in it.JA: Did you check the furnace's filters?Customer: YEs, new

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Gaztech

Owner

Vocational, Technical or Trade School

874 satisfied customers
I got a new furnace last yr and had my old AprilAire 550

I got a new furnace last yr and had my old AprilAire 550 bypass humidifier put on it. On the old furnace, this humidifier worked so good I had to turn it down. On the one, it doesn't humidify at all. The installers have been back several times and it runs but doesn't humidify. Someone finally said it might be because the new system runs hotter but I can't believe it would make the humidifier completely ineffective compared to before. The previous owner was an HVAC person and I keep wondering if he didn't do something to make it work effectively.

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Phil

Consultant to Engrs, Govt & Contractors

Degree, Mech Engr Technology

10,396 satisfied customers
I am currently having a problem with my April Air Model 760.

Good evening all. I am currently having a problem with my April Air Model 760. Here is what I have checked.The humidistat is functioning properly.I am getting 110VAC to unitWith furnace running I disconnected the humidistat leads at the unit and touched the two wires comingcoming from the solonoid valve. Normally I would expect the solonoid to energize and allow water to flow.That did not happen. Would I be on the right track if I thought the problem was with the solonoid valve?

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BillyHvac

Journeyman Service Technician

State Licensed Mechanical Contractor

12,368 satisfied customers
I recently purchased a Venstar T7900 thermostat with

Hello, I recently purchased a Venstar T7900 thermostat with humidity control. I have a Honeywell HE360a whole house humidifier. I would like to remove the sail switch and connect the humidifier directly to this thermostat. I need help with the wiring. Do I need a relay? The Vanstar thermostat that has aux port that can be configured for the humidifier. The thermostat has five wires running to it including a C wire. Thank you!

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D.E. Anderson

Industrial Refrigeration Service Manager

342 satisfied customers
I have a aprilaire 550 whole house humidifier. When I adjust

I have a aprilaire 550 whole house humidifier.JA: I'll do all I can to help. How long have you been dealing with this?Customer: When I adjust the humidistat, the water starts but only for a short time. It does not seem to run consistently. And, there are times when it does not run at all on the same setting.JA: How long has this been going on? And how severe is the problem?Customer: Wondering if its the humidistat. Just this season. I am consistent with changing the filter. and I checked the lines going into the solenoid for clogging. They seem fine. I assume it is an electrical issue with either the humidistat or the transformer.JA: Do you plan on doing the work yourself?Customer: yes.JA: Anything else we should know to help you best?Customer: no.

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HVAC Guru

Service Technician

Associate Degree

27,928 satisfied customers
I m replacing an Aprilaire 58 humidistat with a 60. The 58

I m replacing an Aprilaire 58 humidistat with a 60. The 58 had a C/f terminal and the 60 has a G/f terminal. Do I wire the old C/f wire to the G/f terminal or to the G terminal?JA: I'll do all I can to help. How long have you been dealing with this?Customer: Just started and almost done, just need to land the old C/f wire.JA: Do you plan on doing the work yourself?Customer: Yes, in process.JA: Anything else we should know to help you best?Customer: Not at this time

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HVAC Guru

Service Technician

Associate Degree

27,928 satisfied customers
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