Question about Procom QL300TYLA Heater

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I hooked up the a high pressure regulator and it won't light

I hooked up a high pressure regulator by mistake and the pilot did not light. When I discovered my mistake I hooked up the correct regulator and it still did not light. Did I damage the internal regulator? If so what is the part # and cost and where do I get one? Thanks

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Re: I hooked up the a high pressure regulator and it won't light - Procom QL300TYLA Heater Heaters

About $300 for the valve and pilot assembly

Posted on Dec 11, 2007

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The first thing you need to do is check the gas pressure coming in, this takes a special meter that measures the pressure. If the pressure is ok, then there is an adjustment on the regulator that you can change. I don't recommend that you do any of this because of the possibility of a mistake causing and explosion or fire.

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Did the gas man use a manometer when the gas pressure was adjusted up? The three basic types are 1. round needle guage capable of measuring approximately 30" water column pressure, 2. U-tube manometer filled with a clear or red glycol, and 3. digital guage.

It sounds like the gas pressure is a few inches water column too high which could cause the pilot flame to actually lift off the thermocouple tip causing flame failure after the gas valve opens. More is not necessarily better when it comes to gas pressure. Normal propane manifold pressure is around 10.5" w.c. with maximum inlet pressure of 14" w.c. This pressure can be accurately measured with one of the above listed manometers by tapping into the manifold downstream of the gas valve or in the pressure tap on the downstream side of the gas valve. Most normal 100% redundant gas controls have an individual pilot adjusting screw in the valve itself for adjusting the pilot size and pressure independent of manifold pressure.

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1 Answer

Desa heater

For (fire) safety, there is usually a thermostat that will turn off the gas if pilot light goes out.

So when you try to light the pilot you will have keep press & hold the pilot gas supply for at least 10 sec until the thermostat is heated up. Then only when the pilot light stays on continually, can you turn on the burner.

Forget about changing to a High pressure regulator!

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1 Answer

I have a big buddy heater hooked to a 5lb tank. I can get it to run for 5 or 10 minutes. Then it goes out. When trying to restart the pilot light has built up excess pressure and i have to shut tank valve...

sounds like bad might be able to add one from a grill to get pressure under control.I'm guessing its turning off because its too hot

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1 Answer

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Too much gas pressure. Are you sure that this is a LP heater and not a Natural gas heater? Is the regulator you have rated under 1/2 pound pressure? Try to throttle down the shutoff on the tank to see if pilot gets better. If so, you have a pressure issue. Gas you adjust the pilot gas valve?

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sounds like either a bad thermocouple or more likely a pressure regulator problem. should have unit checked by someone familiar with propane systems.

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You will need to check the pressure regulator for the gas.
It sounds like the gas pressure is to low to keep the pilot lit.


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is the pressure regulator right for the type of gas your using...? i had the same problem.i found out that my regulator was for both lp and nat.gas.i also found out there is a small nylon pin underneath the brass cap on top of the regulator.i unscrewed the cap and the fitting was set for lp.and i was using nat. gas.i just pulled the nylon pin out,flipped it around and replaced the fine now.if your regulator is like mine the nylon pin is maked LP on one end and NAT. on the other.might be worth a try

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4 Answers

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