Modine Heater doesnt get hot

[rockclmbr78]

I have a natural gas 30,000 BTU Modine installed in my garage that I bought used. It is all hooked up and lights just fine when the thermostat calls for heat, the fan and power vent start running too. It never blows hot air though, it stays cold. The burners are all lit but the flames from them are only about 3/4 inch tall. Any Ideas? The model number is 30AE0130

 

[Carguy99]

is there a temp rise from the front to back of the unit?

 

[Bustawrench]

what is the inlet and outlet pressures at the has balve?

 

[rockclmbr78]

is there a temp rise from the front to back of the unit?

I haven't measured the heat but visually the flame size looks uniform all the way down the burner

 

[rockclmbr78]

what is the inlet and outlet pressures at the has balve?

I have no idea, It hooks up to my Natural gas main line. I just ran a 3/4 inch line about 25 feet from the 1" main where it enters my building in the garage. Then used a 48" 1/2" diameter stainless steel flex line to connect from there to the heater.

 

[Carguy99]

How much heat it puts out depends on the temp of the incoming air. Dont know where you live or how cold it is. but I think a thirty degree rise is good. I have one of those and if its real cold it can take a while to heat the place up. mine is a 26000 btu and a 2.5 car garage on real cold days it can take over an hour to go from 30-50