Question about Mr. Heater MHU45LP

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Wiring thermostat Hi, I was wondering where to hook up the thermostat wires on the MHU45LP heater. The instructions are kind of vague and i'm not sure where to hook the wires. Also, for propane hook-up what is needed for a regulator?

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Re: wiring thermostat - Mr. Heater MHU45LP Heaters

On the inside panel wire hook up to W and R

Posted on Jan 24, 2009

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Re: wiring thermostat

A standard propane regulator should work. check on the required pressure for the unit and get a compatible regulator. try grainger supply. thermostat connections are usually 24 volt two wire, opens on temperature rise. connections on the burner relay are indicated TH-TH.

Posted on Nov 15, 2007

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Hi! We have a really old williamson thermostat (not sure about the model but it says t87fi89i 2 8047 [dont know if it's i or 1 either]). We want to replace it with a honeywell t87n east-to-see thermostat....

On most applications for heating the red and white wires are used,however I would check what wires are connected to terminals on old thermostat. These connectons should be labled with initial of wire color,such as R,W,G,Y or Rc. If your green wire is hooked to R or whatever just hook new thermostat up like the old one and you should be ok. Hope this helps. Thanks.

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I'm replacing a non-hydronic electric baseboard heating unit with a Fahrenheat hydronic one. My old unit was 240v using 2 conductors plus bare ground wire. The fahrenheat (PLF series) unit's instructions...

Hello. The red and the black are the hot wires. Therefore, connect one of your conductors to the red and the other conductor to the black. Use wirenuts. The bare ground wire should be solidly attached to the new unit's green wire using a wire nut.
Regards, Joe
PS: please rate my answer. Thank you.

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1 Answer

Six wire hook up and new thermostat has only 5

Some thermostats have an extra terminal for an outdoor sensor which tries to anticipate the need for heating or cooling. If this option is not present, you will have an unused terminal which may have a shorting link to a neighboring terminal. Your installation instructions should mention this if the option is or is not included with your model. Also, heat pump systems vary in the system control voltage and not all thermostats and systems are compatible with the more common split system thermostat.

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2 Answers

MHU45LP won't fire

The pressure switch to which you are referring is the switch connected to the suction side of your induced draft fan. This pressure switch will have a hose connected between the switch and the induced draft fan. Please let me know if you need any more assistance.

Feb 17, 2009 | Mr. Heater MHU45LP

1 Answer

Honeywell thermostat Model CT87N4450 heat works but not air 4 wires coming in red, blue, green, white

I had the same problem and decided to take a chance and call honeywell customer support. I am shocked, they solved my problem! At least in my situation we found that the blue wire ran the compressor. Instead of hooking up to "blue" on the thermostat, we hooked it up to "white." It works wonderfully now.

Jul 02, 2008 | Honeywell CT87B ROUND HEATING&COOLING...

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Replacing a thermostat

Typically if you are replacing a heat only thermostat you will have two or three wires. On the old thermostat these wires will be attached to terminals marked "R", "W" and maybe "G". Document what color wires goes to which terminal and transpose these to the new thermostat. If you have a heat and cool thermostat, you will have two or three more wires and connected to terminals labeled "C", "B" and "Y". Again, transpose these wires to the new thermostat as best you can.

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Goodman Furnaces

what kind of thermostat do you have? make sure all wires are hooked up on thermostat properly for emergency heat operation. hope this helps

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Wiring my 240 V wall mount heater

Your question is kind of vague, but the 240v goes to the heating element, if the heater has a fan, it may be a 110v, so the white is common and should be wired as such. The heater should have a wiring diagram on it.

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