Not comfy with furnace electrical connections.Can I use the incl 24V transformer and avoid wiring into furnace control board?Disadvantage in doing so?
1493654
Yes you can. I use this but I also purchased the separate relay. This tells my furnace when the fan kicks on so it calls for the water.
1493655
The humidifier would run constantly if solonied valve was energized always , might get too much water in system , I wired into fan only gets water when fan is energized
1264979
No. Learn how to run a C wire. Not hard. I've done it twice. Just need to buy thermostat wire and feed it don the wall behind the thermostat and run it to your furnace. Search UTube.
2073491
Yes, but only if you don't connect the COM common wire to provide power to the unit if the batteries die. If at all possible, make sure to connect that wire so the furnace won't go dead when you need it most. It may mean running another wire from the furnace to the thermostat. But it's worth it in the long run.
974409
I comes pre-wired with a standard 120v 3 prong plug. An electrician could hard wire it into your furnace using the existing cord, provided the power requirement is the same.
1513677
NO! This unit needs 120VAC in order to operate and only switches 120VAC. Most fireplaces use 12 VDC to 24 VDC for switch controllers.
2214736
Yes it can, in fact, it has to be hard wired. Since I was replacing the same model, I just used the existing wires & connections coming off the furnace.
2221478
you will need to add a 24 volt wire to this to supply constant power. You can purchase these for about $20 and plug it into the wall. Or run a C wire from your furnace to the thermostat
1562708
If the gas fireplace is controlled by a conventional 24v thermostat use a compatible thermostat . If 120 volt wall switch use 120v in wall switch On / off (no dim)
705176
I assume you want to replace your relay/contactor with the ELV4 which is programmable. Is the base board hot water or electric? The current draw through the load will either be resistive or a circulator motor. And the current will flow through contact points in the ELV4 not sensitive electronics. The one I purchased is used on control a baseboard hot water circulator.
1516076
Yes this can be wired into off- on switch at furnace. This is how I have mine hooked up.The instructions have this hook up, read very carefully its there.
1242988
not electrically qualified to answer that question. I would direct question back to Honeywell
2221884
See the comment by Gene. Note that if you have only two wires from boiler to thermostat you can't power it from the furnace so have to use battery.
1717148
Yes!!! Just follow your furnace manual installation and should not have any problems. My furnace turns ON like if I just bought it!!! Good purchase!!!
991961
what jumper? Look at the wiring diagrams of your thermostat. The power to the thermostat is only to be used if your furnace/thermostat connection doesn't use a 24vac power source. My thermostat needed the extra and I was able to to simply determine that the two wires from the power supply should be on The 3M-50 can be externally powered with a power source rated from 12V to 24V, AC or DC, at connect to the C and RH terminals (no polarity). Look at your thermostat wiring diagram to determine the correct connections. My system is very happy with this arrangement, but be careful not to mis-wire your connections. If you cannot find the correct placement, I recommend calling to your thermostat or furnace manufacturer to be sure of the placement, most 'high-efficiency' units are very computer oriented and please do not risk damage to the control unit on your furnace by mis-wiring. Dee
1601328
Im' not sure it was sometime ago, check to see if wiring is polarity sensitive +-, I do remember that when first connected it it took about 20 sec. to turn on the furnace, and it has to be set about 10 higher than you want the temp. Benefits of modern technology? hopes this helps
1844617
Yes, it has built-in relay & 24volt transformer, so it allows low voltage (24v components) control of the line voltage (240v) loads... Which is the 240 v baseboard heat er(s). Fits in heater wiring compartment.
344542
i would not recommend using this with an inverter, you would be creating a fire hazard.