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Old 12-15-2009, 06:58 AM   #16
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Comfortmaker ignition issues


My rational for waiting until I have the new restrictor plate installed before trying the furnace is that I want to avoid the sooting issue. Am I incorrect?

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Old 12-15-2009, 07:02 AM   #17
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Comfortmaker ignition issues


I want to minimize sooting the new exchangers as much as I can. I want as many variables accounted for prior to firing it up again for tests.
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Old 12-15-2009, 07:08 AM   #18
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Comfortmaker ignition issues


You may alrady have the restrictor plate.

Why install another plate if you already have the proper one in.

Better to check the pressure now. So you can find out if you need the restrictor plate.
Putting the plate in when you don't need it, can cause more problems. And cause you to chase your tail.



PS: make sure you check the manifold pressure the right way. I believe you have a sealed combustion burner.
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Old 12-15-2009, 08:39 AM   #19
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Comfortmaker ignition issues


The manifold and orifices are completely clean. I am waiting to measure the manifold pressure until I have the inducer inlet restrictor plate installed so I minimize run time with that lazy yellow flame. I am very concerned with "sooting" the exchangers again. They are brand new and I would like to keep them as clean as possible. Am I incorrect about this concern?
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Old 12-15-2009, 08:46 AM   #20
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Comfortmaker ignition issues


According to the manual, I check the manifold pressure with my magnihelic attached to the outlet pressure tap fitting and adjust the pressure (if it is in need of adjusting) by changing the setting of the pressure regulator adjustment screw, correct?
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Old 12-15-2009, 01:42 PM   #21
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Comfortmaker ignition issues


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Originally Posted by DARRELL_ICKT View Post
The manifold and orifices are completely clean. I am waiting to measure the manifold pressure until I have the inducer inlet restrictor plate installed so I minimize run time with that lazy yellow flame. I am very concerned with "sooting" the exchangers again. They are brand new and I would like to keep them as clean as possible. Am I incorrect about this concern?
i know you can't install the old one because the mounts are damaged . No?

I never change the restrictor because it has been my bad experience that I get the wrong from the supplier every time.

I use RTV caulk to hold the old one. Just a little. And only enough to hold the plated in place 'til the inducer is reinstalled.

I still am sure (as the others are also) it will make no diff in that on bad burner.
Let us know what happens.
Good luck.
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Old 12-15-2009, 01:45 PM   #22
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Comfortmaker ignition issues


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According to the manual, I check the manifold pressure with my magnihelic attached to the outlet pressure tap fitting and adjust the pressure (if it is in need of adjusting) by changing the setting of the pressure regulator adjustment screw, correct?
You are correct.

On the outlet side of the gas control.

I bet you have been getting some dirty LP and you may have a sticky mess behind that one burner.

Is there a drip leg on the gas pipe supply.
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Old 12-15-2009, 03:21 PM   #23
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Comfortmaker ignition issues


Does that model reference the burner box for regulating the manifold pressure. Or does it reference atmospheric pressure.
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Old 12-15-2009, 04:19 PM   #24
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Comfortmaker ignition issues


You may have the wrong orifices installed. Look at the orifices and note the size stamped on it. Post the size of the installed orifices, btu rating of the furnace and number of burners so the orfice size can be verified.
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Old 12-15-2009, 07:03 PM   #25
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Comfortmaker ignition issues


Thanks again for the feedback. There is no debris, gunk or other comtaminent in the mainfold or the orifices, I dissasembled and cleaned all the parts. The orifices are the same ones that worked fine for 11 years, so I will rule out the thought that they are the wrong size. I did not replace the restictor, as the one that is in mine is correct size at 1- 3/16th inches. I fired the furnace and even with adjusting the pressure regulator screw all the way in, I cannot get more than 9.5" wc out of it. ALSO...I saw that the POOF!!! the furnace does when asked to start, happens PRIOR to the main gas valve opening. I know this is true because I moved my Magnehelic to the manifold side of the valve. My thought is that the pilot gas starts to flow immediately and then the ignitor heats up to the point where it ignites the gas that has built up in the box...POOF!!! Following that I see the Maganhelic (which is measuring the main gas valve pressure) rise to 9.5" wc. I am at the point where those 2 separate issues tell me the "SmatValve" is bad. Feedback please...
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Old 12-15-2009, 07:07 PM   #26
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Comfortmaker ignition issues


Post a pic of your burner box.

You may indeed have a bad valve if your getting a poof before teh gas valve is suppose to open.
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Old 12-15-2009, 07:12 PM   #27
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Comfortmaker ignition issues


I have had Smartvalves with some dangerous and weird happenings. Couple of them the regulators failed and they overfired badly. Another couple shorted internally and turned the main valve on before the igniter. Post some pics of the furnace with both doors off. Curious to know which one you have, lots of different ICP variations of their units.

Last edited by yuri; 12-15-2009 at 07:15 PM.
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Old 12-15-2009, 08:39 PM   #28
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Comfortmaker ignition issues


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Originally Posted by beenthere View Post
Does that model reference the burner box for regulating the manifold pressure. Or does it reference atmospheric pressure.
The burner box is the reference.
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Old 12-16-2009, 03:59 AM   #29
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Comfortmaker ignition issues


Spec sheet for OP's furnace.

http://icpindexing.mqgroup.com/docum...4108100100.pdf
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Old 12-16-2009, 04:00 AM   #30
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Comfortmaker ignition issues


Quote:
Originally Posted by yuri View Post
I have had Smartvalves with some dangerous and weird happenings. Couple of them the regulators failed and they overfired badly. Another couple shorted internally and turned the main valve on before the igniter. Post some pics of the furnace with both doors off. Curious to know which one you have, lots of different ICP variations of their units.
Found the spec sheet. It's a direct fire appliance with a W/R gas valve.

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