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Old 05-02-2012, 10:32 AM   #1
nippaero
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Default New 45K Heater Install

I know some of these question have been beat to death but search is not turning up anything easy. I just installed my heater on the ceiling. I have not ran the gas line or vent yet. I'll probably do that sometime this fall before it gets cold. Can I run the fan on the unit to circulate air this summer without connecting everything up? What thermostat would let me turn on the fan?
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Last edited by nippaero; 05-02-2012 at 10:56 AM.
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Old 05-02-2012, 01:43 PM   #2
dave67fd
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Default Re: New 45K Heater Install

You can. Install any 24v thermostat that has a "fan" or "fan only" type switch/control. You will need to wire that additional line to the heater terminal "G".

You can use a programmable depending if it has that option. If so make sure you ground properly as shown on the wiring diagram. Also some programmables don't interact well with the Mr. Heater control so an isolation transformer maybe needed. Keep it simple and use a manual one.

There are a couple of thermostats designed for garage use and will allow you to go down to i believe 35 deg. but i don't think they have the fan only mode.
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Old 05-02-2012, 07:44 PM   #3
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Default Re: New 45K Heater Install

Great. Thanks. I am guessing as long as I only run it in fan only mode it won't matter if the gas is not hooked up.
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Old 05-02-2012, 07:54 PM   #4
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Default Re: New 45K Heater Install

When you finally hook up the stat of your choice, making sure it has a "fan only" position on the side of the stat, the red wire goes to "R", that's power, the "W" is white and that's for when the stat calls for heat, the "G" terminal and wire are for the "Fan Only" Setting.

You can hook up only the red and green wires if you only want to run the fan.

I did it to mine and its nice to have the air moving around without the heat.
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Old 05-02-2012, 08:26 PM   #5
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Default Re: New 45K Heater Install

what size is your garage? I am thinking of installing a 45,000 in my garage, it's 1200 sq ft. thanks
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Old 05-02-2012, 09:02 PM   #6
nippaero
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Default Re: New 45K Heater Install

It's 24x24. The ceiling is vaulted 9ft at the wall and around 14.5ft at the middle.

Thanks for the help guys. I haven't pulled my permit yet and still have to figure out the venting. Also need to run my gas line fromr the house. Will probably do it this fall.

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Old 05-02-2012, 09:08 PM   #7
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Default Re: New 45K Heater Install

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Originally Posted by D.PHILLIPS View Post
what size is your garage? I am thinking of installing a 45,000 in my garage, it's 1200 sq ft. thanks
With that size of garage, I'd go with the bigger 75k if it were my money buying it. That way you don't have to wait forever for it to heat up.

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Old 05-03-2012, 06:51 AM   #8
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Default Re: New 45K Heater Install

D.Phillips,

I agree with Mmfh, for your 1200 Sq Ft area, you should consider a 75K unit or maybe even bump to a 100K unit. I installed a 45K Modine Hot Dawg for a 500 Sq Ft insulated but detached garage and it heats it OK, sort of struggles and wish I could have went the 60K unit instead. The larger unit will heat the area faster and the on time (cycle time) will be less thus saving $$$ per month
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Old 05-03-2012, 09:36 AM   #9
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Default Re: New 45K Heater Install

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Originally Posted by D.PHILLIPS View Post
what size is your garage? I am thinking of installing a 45,000 in my garage, it's 1200 sq ft. thanks
You'll need a 75K unit for that size space.
I have a 45K in my 26' x 30' see it here:
http://www.garagejournal.com/forum/s...d.php?t=140674
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Old 05-03-2012, 08:00 PM   #10
D.PHILLIPS
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Smile Re: New 45K Heater Install

Thanks for the imput, sounds like a 75,000 btu would be the way to go.
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Old 05-03-2012, 08:41 PM   #11
Charles (in GA)
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Default Re: New 45K Heater Install

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Originally Posted by D.PHILLIPS View Post
what size is your garage? I am thinking of installing a 45,000 in my garage, it's 1200 sq ft. thanks
Are you in Florida or Canada? It matters!

Not to sound sarcastic here, but without knowing where you are located, what climate you are in, how tall the garage is, insulated or not, walls finished or not, ceiling finished or not, among other things, its real difficult to even begin to guess at what you might need.

Charles

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Old 05-04-2012, 09:50 AM   #12
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Default Re: New 45K Heater Install

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Originally Posted by Friartuck View Post
The larger unit will heat the area faster and the on time (cycle time) will be less thus saving $$$ per month
You think? Even though the larger unit runs less it will be using more fuel per hour. Plus if you oversize your heater it can short cycle which will lower efficiency vs. a steady long burn. Seems that modern HVAC pros are sizing devices to run nearly constantly to maintain the set temp thus minimizing cycles and minimizing burner size.
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