Modine Hot Dawg

[njken]

I purchased a used Modine heater model HD45. It has been converted to LP. I want to run it off a small grill tank for now. When I open the tank valve, It seems to have too much pressure and I hear a hiss from the internal component the gas pipe screws into. Does this unit require a separate pressure regulator between the tank and the heater?? Thanks for any light you can shed on this.

 

[American Locomotive]

You need a regulator - the unit should list the specified supply pressure somewhere on it.

 

[4x4Pete]

If you connected it without a regulator, the gas control valve in the unit is probably damaged. They are only allowed 1/2 psi. Anything more damages the diaphram. Usually inlet pressure is on the units rating label.

 

[D45]

45,000 BTU heater will empty a 20 pound grill tank pretty fast

 

[Bert_]

Agree with the comment about possibly ruining the gas valve when you connected it to tank pressure. A grill tank should be able to run a 45,000 btu heater. A 3 burner grill is probably about that much

 

[D45]

It will run it sure......but for how long?

Empty a tank every 15 hours doesn't sound too convenient

 

[njken]

I intend to get a larger tank. This is just to get me started. Thanks to all who replied.

 

[njken]

You guys were right. Gas control valve was toast. I replaced it and added the correct pressure regulator. Tested it on the bench and it fired up as it should. Too easy. I turned it over and mounted it to the ceiling. Hooked up the gas and power and tried to start. The exhaust fan comes on as it should but the flame never lights. There are 2 lights on the circuit board - green labeled OK and orange labeled flame. When the unit is plugged in but the thermostat is off the green light is lit. When thermostat calls for heat, The vent fan starts and the light is solid green. After a few seconds when it should fire, nothing happens and the green light starts to blink. The orange light never comes on. The only difference between the bench test and after mounting is that the unit was flipped 180 degrees. Any theories would be greatly appreciated. Thanks

 

[Adk Mike]

I’ve had one the same model in my shop for 20 years.
The only service I ever did was replace the circuit board. About 75 bucks if I remember correctly.

 

[PoorUB]

You guys were right. Gas control valve was toast. I replaced it and added the correct pressure regulator. Tested it on the bench and it fired up as it should. Too easy. I turned it over and mounted it to the ceiling. Hooked up the gas and power and tried to start. The exhaust fan comes on as it should but the flame never lights. There are 2 lights on the circuit board - green labeled OK and orange labeled flame. When the unit is plugged in but the thermostat is off the green light is lit. When thermostat calls for heat, The vent fan starts and the light is solid green. After a few seconds when it should fire, nothing happens and the green light starts to blink. The orange light never comes on. The only difference between the bench test and after mounting is that the unit was flipped 180 degrees. Any theories would be greatly appreciated. Thanks

Plugged into the same power cord and outlet?

Controls on newer heaters and furnaces are polarity sensitive. They will do weird things if you mix up the hot and common, just like yours is doing.

Have you looked up the flash code for errors?