I've just installed a Honeywell HE360A with a H8908B-1002 Humidstat and an A50 current sensing relay on the common blower wire. The humidifer kicks on with the blower no problem. But the problem is that it will not shut off when the blower goes off. Actually, it does shut off occasionally but 9 times out of ten I have to manually shut off the humidifier from the humidstat. This doesn't make much sense at all to me because I thought the A50 was part of the circuit and if there is no voltage, it must shut off, right? (I've check and re-checked the wiring and it is is correct, see figure 7 page 4 at this address, https://key8361.keyrewards.biz/HE360_Product_Data.pdf) Also, I've made sure that that A50 is more than 3 inches from any other wiring in the furnace so there is no interference. I'm really stumped here. Do I have a bad relay or could this be somthing else? Any help or suggestions is greatly appreciated.
ANY HOME HUMIDIFIER SHOULD OPERATE ONLY WHEN THERE IS A "CALL FOR HEAT".
THAT MODEL COMES WITH A BUILT-IN AIR FLOW SWITCH (IF I RECALL CORRECTLY) THAT CAN GO BAD ... IN THE OLD DAYS WE JUST POWERED THE HUMIDIFIER BY CONNECTING IT TO THE LOW SPEED (FOR HEAT) OF THE BLOWER MOTOR. HONEYWELL HAS HAD PROBLEMS WITH THEIR RESIDENTIAL AIR-FLO SWITCHES ON HUMIDIFIERS AND THEIR ELECTRONIC AIR CLEANERS. AND THEY ARE THE HIGHEST PRICED ON THE MARKET.
IF THEY ARE SENSING CURRENT THROUGH A SENSOR TO THE BLOWER MOTOR WITH A EXTRA RELAY ... THATS HONEYWELLS WAY OF GOING THINGS THE HARD WAY AND THEIR GREAT NEW IDEAS FAILE ALL THE TIME.
HAVE A REPAIRMAN WIRE THE HUMIDIFIER TO THE LOW SPEED SIDE OF YOUR FAN RELAY. IF IT IS 110v MOTOR IN THE HUMIDIFIER AND/OR WATER SOLENOID.
THEN THE HUMIDISTAT INTERUPTS THAT CIRCUIT.
Is you water solenoid 24v or 110v that is the first thing to know to get rid of the extra parts honeywell enginners into things to make money when they fail.
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Unless you are using a current sensing relay or sail switch, you need to get the humidifier power from the blower motor supply so it only operates when the blower is on.
Since you can manually control the humidifier, there is not a fault with the solonoid.
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This is my first winte in this home. During my "winter" check-up, my heating/air service tech told me the humidifier was fine, although I had not yet been running it, and to set the humistat at 30. It has a new humidifier pad.
The problem is that the fan and water are running constantly, not just when the furnace kicks on. I don't want to call the tech until I know what I'm talking about because I don't want to have to pay for an additional service call. If this problem existed when he was here earlier, I think it should be covered under that visit. Could this be an electrical issue? Or some type of faulty sensor? -- Thanks!
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