Reznor heater air not hot

[ranger098]

Hi all,

I am a bit of a newbie when it comes to heaters, so this may be a simple question. i recently installed a reznor UDAP V3 30000 BTU natural gas hanging heater in my 2 car garage, 24' wide 25' deep 14' tall.

all works perfect, turns on and off as it should. the only issue i have is that the air coming from the heater is not very hot. It takes 2 or more hours for the garage to be comfortable temp (60-65 degrees) during winter months. My brother has a 30000 btu Hot Dawg and his garage (significantly larger) is warm in about a half hour. if i put my hand in front of my heater, the air blowing from it is not very warm, maybe 70-80 degrees would be my guess, and my brother's hot dawg is much hotter air. I even put a ceiling fan in the garage, but didnt make much difference.

I am wondering if this is normal or if there is any way to make the air that comes from the heater hotter? Is this just a reznor heater behaving normally? i am using a fairly basic digital thermostat if that makes a difference.

Thank you in advance to anyone that responds to this!

 

[ranger098]

anyone???

 

[Gear Box]

1.Check orfices (clogged)
2.gas valve bad?
3.gas supply pressure?
4.service tech call
My reznor makes hotter air, not normal

 

[kenfath]

Is your heater getting enough fuel? Years ago we were having problems with an attic installed horizontal furnace. We had the gas company inspect it. I was doing some other corrections to a very botched installation, so gas co's person stood on ladder (there wasn't room for both of us) and instructed me to disconnect the flexible pipe at the valve, then turn the valve on. Got a hiss from the gas. He then had me ream the valve with the wire handle on his brush. A much stronger hiss resulted. His comment was pipe dope will often buildup and restrict the flow at the valve. Worth a try.

 

[ranger098]

very good advice! i will check that out, much appreciated.

 

[rodm1]

I would guess its something with your full. What color is the flame? It should be blue not orange.

Make a manometer and check your orifice adjustment. I think most are setup for NG already. What size gas line are you using?

 

[ranger098]

sorry so late i just noticed the post now!

the line i am using is 3/4" (i believe) and the flame is blue. Forgive me but i dont know what you mean by "I would guess it is something with your full"... Heaters are not exactly my area of expertise, though i know a little. Thanks for the response.

 

[brihvac]

I have the same heater and have no problems. Discharge is gonna depend on the space temp/return air. As it gets warmer the discharge will follow. There really is no way to make it "hotter" 3/4 should carry plenty of gas unless you have an extremely long run. 30,000 BTU is 30,000 BTU. As far as your brothers garage, take into consideration insulation, etc.

 

[ranger098]

brihvac- do you have an in-line regulator on your gas line? I bought my heater from an HVAC guy and he supplied me with gas lines/fittings and a regulator, so i assumed i needed it. In the install manual that came with the heater, however, it does not mention using a regulator. maybe that is my problem? let me know what you think and thank you again.

 

[ranger098]

To anyone wondering how this turned out- I had a HVAC guy come out and he said all is well with the install/heater, it is behaving normally. Just not big enough for my space. I personally think it could be because there is only one burner in this particular heater, and most bigger ones use at least two. Time to upgrade!

 

[HoosierBuddy]

Glad you got this all figured out!

Just for future reference...how I would have (quickly) checked this issue would have been to insure all the other big gas appliances in the home were off and then turned the heater on while watching the gas meter.

Typically gas meters have a half-foot-hand which indicates about 500 BTU's worth of gas delivered. A 30,000 BTU/hour load would be 1 revolution of the meter's half foot hand per minute.

Calling an HVAC professional was a better choice...but if the heater would have been underfiring significantly...clocking the meter would demonstrate that. i.e. 1/2 foot of gas every 2 minutes would indicate only 15,000 BTU/hour through the meter. etc.

Phil