oil fired radiant tube heater fail to fire


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Old 02-14-17, 12:14 PM
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oil fired radiant tube heater fail to fire

I have a solar ray ( company no longer exists ) radiant tube heater with a Beckett afii burner ass. I have replaced the following

new nozzle tip
new igniter
new igniter electrodes
new cad cell
new controller Honeywell R7284u

When first swapped out the controller unit fired and ran for several cycles and seemed to be fine. Now after power being off to the unit it comes on runs thru its start up then fails to fire and times out. On display it showed tt configuration closed ? Checked cad cell display when on but not running and shows a reading of 99999? pump pressure is 140 psi. did a physical test (wired direct to power) on ignitor and is sparking. could this be a control limit issue ? I have it set for the furnace option and tt on yes.
 
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Old 02-14-17, 01:43 PM
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T,
From what you said so far it seems like it may be an oil problem. By process of elimination, you have spark so your transformer and electrodes are good if the electrodes are aligned properly. The 9999 reading is because the cad cell eye is not seeing light because there is no fire. Your primary control is shutting down for the same reason, so everything is doing its job.

Try bleeding the pump to see if you have air in the line. Have you changed your oil filter and pump screen. If you cannot bleed the pump check your coupling between the motor and pump. They do wear out and if that's the problem that will cut the connection between the motor and pump and therefore no oil delivery.

Hope this helps a little.
 
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Old 02-14-17, 01:49 PM
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Welcome to the forums.

This is one of those radiant tube heaters that hangs from the ceiling ?

If yes.... it almost guaranteed you have a fuel issue especially with the lift needed.
Any compression fittings in line will be a problem.
 
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Old 02-14-17, 11:15 PM
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Sorry for the late reply the pump is fully operational have tested flow with line off at burner tube and pressure on pump gauge is 140psi. The system has been in place and running for over 15yrs. There is a tiger loop in the system do to the height. I just not sure why the system failed after the loss of power. Will re bleed the pump in case it did draw air.
 
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Old 02-15-17, 10:30 AM
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T,
It sounds strange that after all that time that air, if that's what it is got in there and the tiger loop should have taken care of that, but stranger things have happened would be the problem.

Just one thought on pumps since you mentioned the height, are you using a single stage or 2 stage pump.

I would definitely double check all the fittings and remove all compression for flair even if they look good. It takes very little air to stop oil flow.
 
 

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