Question about Humidifiers
I have a three year old 1137 humidifier that is not letting water through the solenoid. It is the 115 volt model. I bought a new solenoid and still no water. I have good water supply to the solenoid. When the furnace is on the humidifier fan also comes on but the solenoid does not open to let water through. I have moved the humidistat back and forth from high to low and it does not open the solenoid. Possibly the relay circuit assembly is bad. I guess that is my question are do you have any other ideas or solutions. Thank you.
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Posted on Jan 02, 2017
SOURCE: Installation problem
I WOULD CHECK TO SEE IF YOU HAVE ENOUGH V/A OUT-PUT ON TRANSFORMER. I DONT KNOW IF YOURS CAME WITH ITS OWN TRANSFORMER. IF IT DIDNT YOU SHOULD HAVE A MINIMUM OF A 40 V/A RATING STAMPED OR PRINTED ON THE EXISTING TRANSFORMER. IF THE TRANSFORMER IS EXTREAMLY HOT ... YOU MAY NEED A 75 V/A TRANSFORMER WITH THE SAME VOLTAGES. INCREASING THE V/A CANNOT DAMMAGE ANYTHING IT JUST GIVES YOU MORE POWER WHEN EXCESIVE CONTROLS AND WIRING ARE ADDED TO A HVAC LOW-VOLAGE (24v) CIRCUIT. IF YOU LIKE YOU CAN CALL ME AT 727-363-7071. I AM A RETIRED HVAC&R CONTRACTOR WITH 45 YEARS EXPERIENCE. I HATE THE NEW SENSORS THEY HAVE TO ACTIVATE THESE NEW HUMIDIFIERS. I USE TO WIRE THE HUMIDIFIER TRANSFORMER (SUPPLIED WITH HUMIDIFIER) TO THE LINE (110V) SIDE TO THE LOW SPEED ON YOUR BLOWER MOTOR. THAT WAY THE ONLY THING THAT INTERUPTS THE CICUIT IS THE HUMIDISTAT. YOU NEVER WANT THE HUMIDIFIER TO RUN IF YOUR SYSTEM IS NOT "CALLING FOR HEAT". NEVER TRY TO ENERGIZE THE WATER SOLENOID THROUGH YOUR HEAT WIRE(USUALLY SMALL THE WHITE WIRE) FROM THE THERMOSTAT. THIS WILL RESULT IN BURNING YOUR HEAT ANTICIPATOR OUT ON THE T-STAT.
Posted on Apr 28, 2007
I had a problem quite similar to this. It was the power connector.
This is the 4-pin white connector that engages when the cover is
removed/replaced when accessing the water panel.
One of the pins was loose in the connector thereby supplying intermittent 24 volt power for the solenoid that is powered by the fan motor control board transformer in the humidifier cover next to the fan motor (not seen unless fan is dissembled).
If you are technical such as I am this is easy to fix by removing the connector, removing the loose pin, and often each retaining clip on the connector pin can be bent out slightly, then replace the pin, and then it should be fine. Also, it's best to check this out on a bench while running the entire unit. You also might need to replace the entire power connector. Sometimes it's easy to think the problem is a defective solenoid or fan motor/transformer board, etc. It's frustrating, because sometimes the humidifier works perfectly, and then sometimes there is no water flow. Since I did this mine has been 100% OK.
NOTE: IF YOU ARE NOT TECHNICAL DON'T EVEN ATTEMPT TO FIX THIS PROBLEM, CALL IN A PROFESSIONAL TECHNICIAN. LETHAL VOLTAGES ARE PRESENT IF THE FAN CIRCUIT MOTOR CONTROL BOARD IS EXPOSED. ALSO, MUCH OF THIS IS FRAGILE. IT COULD
BECOME COSTLY IF YOU MESS UP.
Posted on Feb 07, 2008
SOURCE: wiring problem
Sounds like you may have put 120v through a 24v solenoid and humidistat.
Is the HUM terminal on the furnace 120v or 24v?
If it is a 120v terminal you will need a 120x24v transformer and a new solenoid and maybe a new humidistat.
Posted on Jan 02, 2009
Thanks for your question,
first you need to determine if you have 24 volts from the transformer, if you have knowledge of electrical meters then this should be fairly easy, if not then you will need to do a little rewiring to find out if it is the solenoid, first you will need to do is shut the power off to your furnace, then get some t-stat wire, long enough to reach from the solenoid to the transformer, splice together the new wire to the wire from the solenoid, now take the other end of the wire, take the leads off the transformer (low voltage side) and hook the new leads to it, make sure the water is on, now turn the furnace back on, and if the solenoid is good the water will flow, if it doesnt, then you will need to replace the solenoid, if the solenoid does work then you know your problem lyes with the Humidistat, and you will have to replace that, but you need to determine if you have 24 volts from the transformer first, hope that helped, let us know and please rate this, thanks again ,
Posted on Jan 25, 2009
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