Question about Reddy Heater-30-55,000 BTU Variable

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I have a Readdy Heater Model #M50A, Spec#5003G03, Serial #9220342 w/3.6 psi pump. I cannot get it to fire all the way when plugging in. I cleaned all the parts or replaced them including the plug which was set to the proper gap and turned in the heater the proper way. It has a very small flame in the combustion chamber but will not fire allm the way. Any suggestions as to what i can do?

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The pump is not applying enough pressure to allow sufficient fuel volume to the plug. if the plug is not receiving a proper spray to vaporize the fuel at contact, it will not provide enough flame.

Posted on Dec 31, 2010

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Starts then shuts off


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.
  1. The FIRST STEP in diagnosing any heater problem should be checking the output of the air pump. Determine the air pressure required for the heater model that is being tuned. The air pump, in turn, is responsible for fuel delivery.
  2. If you do not know the required pressure look for a decal on the side (usually) of your heater. This decal will state the model number, serial number, fuel capacity, pump pressure, etc.
  3. If your plastic end cover looks like this......
m29609t.jpgM29609 has 2 threaded holes. The 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.
or
If your plastic end cover looks like this......
m16545t.jpgM16545 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.

Feb 17, 2015 | Reddy R60A Utility Heater

1 Answer

Runs when started but won't stay running.


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.
  1. The FIRST STEP in diagnosing any heater problem should be checking the output of the air pump. Determine the air pressure required for the heater model that is being tuned. The air pump, in turn, is responsible for fuel delivery.
  2. If you do not know the required pressure look for a decal on the side (usually) of your heater. This decal will state the model number, serial number, fuel capacity, pump pressure, etc.
  3. If your plastic end cover looks like this......
m29609t.jpgM29609 has 2 threaded holes. The 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.
or
If your plastic end cover looks like this......
m16545t.jpgM16545 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.

Feb 13, 2014 | Reddy HEATER R70DT 70,000-BTU PORTABLE...

1 Answer

My father has a Readdy heater M50S Spec #3183G13 and needs to get a new motor He's in northwest Ohio,I


That is a tough motor to find. Have you tried the website called www,reddyparts.com?

Nov 21, 2011 | Heating & Cooling

1 Answer

I have a 40 gallon electric reliance water heater model no. 8 40 2ARS8 - serial no. M94566434 that I need dimensions for so that we can replace it with a new model. Thank you.


http://www.aosmith.com/OperatingUnits/Detail.aspx?id=138&ekmensel=c580fa7b_12_0_138_3
Reliance is an AO Smith company

http://www.reliancewaterheaters.com/prod/elec.html
Link above goes to Reliance electric water heaters
I cannot find your model number
The serial number seems to show it was made in 1994, so the spec sheet would be difficult to find
You must have bought a good heater and taken care of it for it to last that long.

http://www.reliancewaterheaters.com/lit/spec/electric/R606E0510.pdf

Typical 40 gallon Reliance electric:
18" x 59-1/2"
20-1/2" x 44"

http://www.reliancewaterheaters.com/lit/spec/electric/R909E0510.pdf
Self-cleaning type Reliance 40 gallon
19" x 60"
21-1/2" x 46"

The size of your heater can be determined by measuring the height, and then measure across the top to get the diameter. Your measurements will be close to the numbers shown above.

Oct 29, 2010 | RELIANCE ELECTRIC WATER HEATER

2 Answers

Ive got a 1997 cavalier it will start but quickly dies out ive got fire to my plugs and fuel to the injectures ive just replaced the ignition switch is there somkind of a security


You need a new fuel pump relay. The engine fires up and runs off the oil pressure switch untill the oil pressure PSI is reached at normal operating conditions. When the oil pressure reaches its operating PSI the PCM or engines computer will shut off that circuit and turns on the fuel pump relay to run the fuel pump untill you shut the engine off

Apr 19, 2010 | 1997 Chevrolet Cavalier

1 Answer

Unit will not run


Sounds like the pump pressure needs adjustment. If it's off from spec, (even a fraction), the unit will not fire up and run. If you still have your owners manual, check to see what the pump pressure is posted for. (probably around 3.5 PSI). Also, check for clogged fuel filter a that will restrict fuel flow and pressure...

Jan 07, 2009 | Reddy Heater-30-55,000 BTU Variable

1 Answer

Adjustment of spring loaded valve at rear of kerosene heater


pull the red cap out. install a psi guage into the hole. on the tube it should have pressure specs. mine was 4.5 psi. but with the unit on you adjst the springloaded plug to the proper pressure. and reinstall the cap. you should replace the filter on the back and the one insde if there is still a problem. also make sure no crack are on the fuel line. if you still have problems keeping the flame, clean the nossle tip but don't loose the little part in the center.

Dec 03, 2008 | Reddy Heater-30-55,000 BTU Variable

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