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Bart Jay
Bart Jay, HVAC Technician
Category: HVAC
Satisfied Customers: 655
Experience:  35 years in HVAC. NATE Certified EPA certified
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Hello, I have a dayton infrared heater model 3E461B, serial

Customer Question

Hello, I have a dayton infrared heater model 3E461B, serial 000501000018A. The heater will work for fine sometimes and sometimes after 5 or 10 minutes it will quit burning. We have cleaned the heater. What should we check next?
Submitted: 4 years ago.
Category: HVAC
Expert:  Bart Jay replied 4 years ago.
Do you have the moel number of the thermsotat?
Customer: replied 4 years ago.
There is no thermostat. This heater is operated with a light switch to turn on power to the heater.
Expert:  Bart Jay replied 4 years ago.

There is a flame rod that may need to be cleaned. It is a metal probe that snese the flame. Has ceramic on the end and a metal probe. Lightly sand that ans see what happens. looks somthing like this

 

http://www.grainger.com/Grainger/WHITERODGERS-Flame-Sensor-4E957?Pid=search

 

Customer: replied 4 years ago.

I tried that, but the heater still went out after a few minutes.

Expert:  Bart Jay replied 4 years ago.

There only only two things that would dhut it doen one is the flame rod, or the main control board. Without a meter its a crap shoot but the flame rod is cheap and easy to replace. here is the Grainger parts list

 

VR4205M-1316 Lp Gas Valve-120v 1 Contact Us
GA10-15 Manifold 2 Contact Us
JB0514 Box,junction 3
MARK10DX-117 Circuit Board - See Note 4 Contact Us
52 ORIFICE Orifice-lp Gas 5 Contact Us
HVW-18 18in High Volt Wire 6
LVW-18 Low Voltage Wire 6
32-508 Electrode Assembly 7 Contact Us
DR-RH Rayhead Heater Assembly 8 Contact Us
DR-LROD Rod L-171/2 Inch 9

Customer: replied 4 years ago.
I have a meter, what shall I check?
Expert:  Bart Jay replied 4 years ago.
With the flame on you need to put your meter is series with the flame rod and measure micro amps
Customer: replied 4 years ago.
Am I looking for a certain reading, or am I just testing to see if there is a reading and then I lose the reading when the heater goes off?
Expert:  Bart Jay replied 4 years ago.

Both, you should have at least 5ma

 

http://hvacwebtech.com/Flame%20Rectification.htm

 

If you have a good steady reading and the flame goes out the problme is the board

 

 



Edited by Bart Jay on 11/30/2010 at 4:32 PM EST
Customer: replied 4 years ago.
Ok, had a reading of 1.0 to 1.2 for about 10 minutes with heater working properly, then reading dropped down to .2 and heater went out.
Expert:  Bart Jay replied 4 years ago.

It the fire did not change at all then I would say the flame rod is bad. It may be expanding and changing its resistance.

Customer: replied 4 years ago.
I cleaned the burner some more and re-cleaned the flame rod - the heater has been burning for about 45 minutes now. Above you mentioned I should get 5ma - I get a range of 1.3 - 1.5 with my Fieldpiece SC76 set on uA setting. Is it crucial that we get 5ma or is it just important to have a fairly steady reading?
Expert:  Bart Jay replied 4 years ago.
Steady is very important. It it stays running you should be good
Bart Jay, HVAC Technician
Category: HVAC
Satisfied Customers: 655
Experience: 35 years in HVAC. NATE Certified EPA certified
Bart Jay and 2 other HVAC Specialists are ready to help you
Customer: replied 4 years ago.
I believe we may have fixed it. It's been burning for 3 hours now. Thanks for your help.
Expert:  Bart Jay replied 4 years ago.

Great thanks.

If it fails agian i would repalce the flame rod

Expert:  Bart Jay replied 4 years ago.
If i helped please accept and positive feedback is appreciated
Customer: replied 4 years ago.
I did accept yesterday and I left feed back as well. Did it not go through or something?
Expert:  Bart Jay replied 4 years ago.
I'm sorry it did thank you

Edited by Bart Jay on 12/1/2010 at 7:44 PM EST
Customer: replied 4 years ago.
No problem, thanks again for your help!

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Bart Jay
Bart Jay
655 Satisfied Customers
35 years in HVAC. NATE Certified EPA certified