Question about Reddy Heating & Cooling
Can't get fuel to flow. Has good spark, but fuel filter is empty and can't figure out how to get the fuel to flow from the tank to the blower. Is there some kind of fuel pump? How does it work and what makes it work.
REAL FACT is: If all individual components of the heater are at 100% but the air pump pressure is not on it's mark, then the heater WILL NOT continue to run!
Air Pump Pressure is directly related to fuel delivery. Read that statement again! It is the most important line of text on this website.
If the pump pressure is incorrect, then, the fuel delivery will be incorrect. As a result, the heater will not run to specs.
Instructions for setting the air pump pressure:
Air pump pressure is the pulse of the heater. Pump pressures range from 3 psi to 6 psi depending on heater BTU size (see chart below). A loss of ONLY 1 psi translates to a 30% to 17% loss of FUEL FLOW (starvation). You must know the specified required pressure and set the pressure accordingly.
Heaters with Hot Surface Ignitor technology are extremely critical to pump pressure. If the pressure is off by 1/2 psi, the heater may run for 5 seconds, then shut down because of IGNITION FAILURE. The only way to correct this problem is to set the pump pressure to DESA's recommended pressure specification.
If your plastic end cover looks like this......
M16545 has 2 threaded holes. The shorter projection with a hole on the left has a square plug inserted. Remove the plug. Screw in the nipple end of the gauge into the threaded hole. Check for air leaks with soapy water.
4. The other hole (longer projection) has a screw with a hole which adjusts a ball and spring relief valve assembly. Carefully adjust the screw until the gauge is reading the pressure level that is specified on the heater's label. If operating properly, the pump should produce more pressure than is required to operate the heater. The relief valve allows the excess air to escape before being sent to the nozzle.
5. Replace plug. Test for leak.
6. If you are unable to reach the desired pressure spray soapy water around the seal of the end cover- at the same time check the plastic cover for a crack. A cracked end cover will not allow the heater to perform properly and will not allow for an accurate reading. The pump must be set at the specified pressure in order to have adequate fuel delivery an adequate fuel atomization. Replace if needed.
7. If you set the pressure to specs and the heater does not perform properly or the cone does not glow a soft red, then check for other fuel delivery problems such as a clogged fuel filter, cracked rubber hose, clogged or worn nozzle, or a cracked nozzle adapter. Soapy water lightly sprayed in these areas will quickly identify the problem most of the time. Any air leak will create problems.
Posted on Mar 04, 2015
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Posted on Jan 02, 2017
Lawn Boy sent me an 800 number for the company they sold the heater line to.
800-362-6951 portable heater parts. I have not called yet to find out if they will have qhat I need. Will call tomorrow, Tuesday.
Posted on Jan 27, 2009
Depending on how old your heater is, you may bay be able to download the Owners Manual from the Reddy Heater Home Page website. Reddy Heater was made by DESA International (now out of business). Another company bought the Reddy Heater part of the business, so they are still being manufactured.
Posted on Feb 02, 2011
SOURCE: I Have an old M30
The line from the pump to the nozzel should go inthe front fitting and the one from the tank goes to the backfitting. If either of these have cracks in them or do not fit tightly over the fittings it will not build enough pressure and burn. You may also check the filters mainly the output filter as this will also effect pump pressure. I don't have as much experiance with that brand so I can't be sure exactly about the pressure. I think it should be 3.5 to 4 Psi. If this doesn't help please email me and I will find out for sure.
Posted on Feb 03, 2011
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