How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Matthew Your Own Question

Matthew
Matthew, HVAC Technician
Category: HVAC
Satisfied Customers: 1994
Experience:  14 years experience in the HVAC field of service, installation, Manual J & D calculations
Type Your HVAC Question Here...
Matthew is online now
A new question is answered every 9 seconds

anyone have knowledgeof wiring humidifiers to furnaces

Resolved Question:

anyone have knowledgeof wiring humidifiers to furnaces?
Submitted: 4 years ago.
Category: HVAC
Expert:  Matthew replied 4 years ago.

What is the model of the humidifier?

Customer: replied 4 years ago.
bestair BA200, am I wiring it to the same transformer inside that furnace that the thermostat is wired to?
Expert:  Matthew replied 4 years ago.

I am having a hard time finding this humidifier's information so I will need just a little more information to help you.

 

1. What terminals are there on the humidistat

 

2. are there only 2 wires hanging off of the solenoid

 

3. Do you have any other accessories hooked to this furnace ( filter, dehumidifier, U.V. lights, Zone board)

Customer: replied 4 years ago.

very little info out there, the humidifier solenoid has 2 wires comming from it, the humidistat has 2 terminals and they are not labeled, nothing else hooked to furnace. my furnace white-rodgers circuit board has no HUM or EAC terminals. I was told by York tech support that I need to wire it to the heat cycle of the furnace. My hot or common wire will be red/yellow and my neutral white. they failed to tell me the location of these wires, so I am assuming they are on the furnace transformer, the same one the thermostat is wired to, am I right?

Expert:  Matthew replied 4 years ago.

ok here it is

 

one side of solenoid goes to one side of humidistat

 

other side of solenoid goes to the W terminal on the furnace control board

 

Other side of humidistat to C on the furnace control board

 

Now this is only if you are not using a separate transformer for the humidifier. There should be nothing between these connection just do it exactly like I described and the humidifier will power up when the heat is on and the water will flow to the solenoid if the humidistat is sensing that it needs more humidity to meet the % it is set at.

Expert:  Matthew replied 4 years ago.
If you where to hook to the 24v leads coming directly off of your transformer in the furnace the solenoid would have power all the time and water would pour through it even with the furnace off.
Customer: replied 4 years ago.

so again. where do i hook it in? it must be somewhere on the control board

Expert:  Matthew replied 4 years ago.
Follow your thermostat leads into the furnace. where they hook are these terminals I am talking about. It could be this furnace has wires that the thermostat wire nut too. If that is the case tell me the color wires that hook to your thermostat wires. Sorry but your picture did not come through it is blank.
Customer: replied 4 years ago.
graphic
Customer: replied 4 years ago.
the only other suggestion I have is to let me email you the furnace manual with wiring diagram
Expert:  Matthew replied 4 years ago.
Sorry but I still can not read it just looks like blurs can't distinguish the wires and parts. Can you not find where the thermostat wires hook up? I can not give out my email sorry
Customer: replied 4 years ago.
they hookup to the transformer inside the furnace. there is a R, W, G, Y AND C
Expert:  Matthew replied 4 years ago.

AHHHH ok you have a mounted terminal transformer sorry sorry. Yes you hook up right there W and C go right under the terminal with the wire that is already hooked there from the thermostat

Customer: replied 4 years ago.

since this transformer that the thermostat is hooking to is 24volts, can I assume I do not need to use the supplied 24 volt transformer because I am not hooking to the furnace control board which would be 120volts?

Expert:  Matthew replied 4 years ago.

correct. If you want to use the supplied transformer than you have to tie the 120v side of that transformer in with 120v coming out of an outlet somewhere or on the 120v side of the furnace voltage supply then hook the humidifier in tot he 24 side, but using the furnace transformer is perfectly fine as long as you do not have any other accessories tied into this furnace like a U.V. light, electric air cleaner, or zone boards.

Expert:  Matthew replied 4 years ago.

If you do use the supplied transformer on this furnace since it does not have a Hum terminal you would need a current sensing relay in line with the humidifier circuit to switch it on and off during a heat call. This relay hooks around the heat speed wire of the blower motor and then splits one of the 24v lines going to the humidistat or the humidifier.

 

Aprilaire 50 Current Sensing Relay 24v

Matthew, HVAC Technician
Category: HVAC
Satisfied Customers: 1994
Experience: 14 years experience in the HVAC field of service, installation, Manual J & D calculations
Matthew and other HVAC Specialists are ready to help you

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
< Last | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • gotoman for ac

    HVAC Technician

    Satisfied Customers:

    4657
    51 years of experience install design and repair of all makes and models of AC
< Last | Next >
  • http://ww2.justanswer.com/uploads/SE/ServiceTechRus/2012-6-7_2119_056.64x64.JPG gotoman for ac's Avatar

    gotoman for ac

    HVAC Technician

    Satisfied Customers:

    4657
    51 years of experience install design and repair of all makes and models of AC
  • http://ww2.justanswer.com/uploads/AL/alumalite/2012-5-10_234018_shutterstock506249951forJA500.64x64.jpg Phil's Avatar

    Phil

    Mechanical Engineer

    Satisfied Customers:

    3888
    Retired HVAC/ Electrical & Boiler contractor. Industrial
  • http://ww2.justanswer.com/uploads/skibum0101/2008-12-16_015819_just_answer.jpg Rick Mather's Avatar

    Rick Mather

    HVAC Technician

    Satisfied Customers:

    3132
    35 years experience, HVAC
  • http://ww2.justanswer.com/uploads/RY/Rygis20/2011-5-7_3143_DSC5324.64x64.JPG Matthew's Avatar

    Matthew

    HVAC Technician

    Satisfied Customers:

    1994
    14 years experience in the HVAC field of service, installation, Manual J & D calculations
  • http://ww2.justanswer.com/uploads/KE/kentguidry/2011-9-26_214316_0059.64x64.jpg Kenton Guidry's Avatar

    Kenton Guidry

    HVAC Technician

    Satisfied Customers:

    962
    12 years install/service experience.
  • http://ww2.justanswer.com/uploads/solarman1947/2009-12-13_223915_phpkKBcXq_c2PM.jpg Rick Ridley's Avatar

    Rick Ridley

    UK Heating Engineer

    Satisfied Customers:

    871
    Retired But have had 30 years on the tools, Ex CORGI
  • http://ww2.justanswer.com/uploads/Ironheadfan/2009-12-18_222416_pump_005.jpg Tom's Avatar

    Tom

    HVAC Technician

    Satisfied Customers:

    770
    16+yrs HVAC/R service. Residential Commerical Industrial