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Posted by KJPRO on December 28, 2008, 2:38 pm
> On Sat, 27 Dec 2008 21:49:38 -0500, The King
>>On Sat, 27 Dec 2008 21:32:00 -0500, .p.jm@see_my_sig_for_address.com
>>wrote:
>>>On Sat, 27 Dec 2008 13:42:57 -0500, The King
>>>>On Sat, 27 Dec 2008 13:07:56 -0500, .p.jm@see_my_sig_for_address.com
>>>>wrote:
>>>>>On Sat, 27 Dec 2008 09:55:08 -0800 (PST), cozzmo1@hotmail.com wrote:
>>>>>>-----
>>>>>>I have a gas furnace, comfortmaker RPJ2 and suspect that it needs a
>>>>>>new controller general 90 50A50-110 replacement number is 50A55-843
>>>>>>symptom:
>>>>>>The igniter works and burns bright, but intermittently the burners
>>>>>>will not ignite and the the blower will just keep blowing as the house
>>>>>>gets colder.
>>>>>>Recycling the power to the unit seems to fix this for a while.
>>>>>>Is there a good test I should do?
>>>>> Amp the ignitor. Looking at it tells you nothing.
>>>>Amping this one wont tell him anything either. This controller does
>>>>not look at the ignitor amp draw.
>>> OK - but amp it anyway. Even if proofing is accomplished
>>>differently ( as it often, in fact usually, is ), amping it will tell
>>>you if it's getting up to proper ignition levels. More to the OP's
>>>question, the 'brightness' of the ignitor is of course meaningless.
>>This controller uses a flame rod for flame proving. Amping it only
> Fine. And amping the HSI will tell you if it's doing what
> it's supposed to do ( problem is elsewhere ) or not ( replace the HSI,
> not the rod, controller, etc :-)
>>helps if you know what a new one amps out at. The ignition systems
> I'm sure there is a 'nominal amp draw' that is considered
> 'required performance of the HSI'.
> Of course, another test is to observe a failure and see if the
> pilot lights. If it does - the HSI got hot enough, look to the
> rectification circuitry for a problem. However, in an intermittent
> failure situation, where you may not get to observe a failure, a
> 'borderline' HSI is a good suspect, where a 'good solid amp drawing
> HSI' is much less so.
>>that use a HSI for rectification usually need to see a min amount of
> The HSI itself is NEVER used for 'rectifcation'.
Never? Rheem drum comes to mind...
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Posted by Steve on December 28, 2008, 4:52 pm
>> On Sat, 27 Dec 2008 21:49:38 -0500, The King
>>>On Sat, 27 Dec 2008 21:32:00 -0500, .p.jm@see_my_sig_for_address.com
>>>wrote:
>>>>On Sat, 27 Dec 2008 13:42:57 -0500, The King
>>>>>On Sat, 27 Dec 2008 13:07:56 -0500, .p.jm@see_my_sig_for_address.com
>>>>>wrote:
>>>>>>On Sat, 27 Dec 2008 09:55:08 -0800 (PST), cozzmo1@hotmail.com wrote:
>>>>>>>-----
>>>>>>>I have a gas furnace, comfortmaker RPJ2 and suspect that it needs a
>>>>>>>new controller general 90 50A50-110 replacement number is 50A55-843
>>>>>>>symptom:
>>>>>>>The igniter works and burns bright, but intermittently the burners
>>>>>>>will not ignite and the the blower will just keep blowing as the
>>>>>>>house
>>>>>>>gets colder.
>>>>>>>Recycling the power to the unit seems to fix this for a while.
>>>>>>>Is there a good test I should do?
>>>>>> Amp the ignitor. Looking at it tells you nothing.
>>>>>Amping this one wont tell him anything either. This controller does
>>>>>not look at the ignitor amp draw.
>>>> OK - but amp it anyway. Even if proofing is accomplished
>>>>differently ( as it often, in fact usually, is ), amping it will tell
>>>>you if it's getting up to proper ignition levels. More to the OP's
>>>>question, the 'brightness' of the ignitor is of course meaningless.
>>>This controller uses a flame rod for flame proving. Amping it only
>> Fine. And amping the HSI will tell you if it's doing what
>> it's supposed to do ( problem is elsewhere ) or not ( replace the HSI,
>> not the rod, controller, etc :-)
>>>helps if you know what a new one amps out at. The ignition systems
>> I'm sure there is a 'nominal amp draw' that is considered
>> 'required performance of the HSI'.
>> Of course, another test is to observe a failure and see if the
>> pilot lights. If it does - the HSI got hot enough, look to the
>> rectification circuitry for a problem. However, in an intermittent
>> failure situation, where you may not get to observe a failure, a
>> 'borderline' HSI is a good suspect, where a 'good solid amp drawing
>> HSI' is much less so.
>>>that use a HSI for rectification usually need to see a min amount of
>> The HSI itself is NEVER used for 'rectifcation'.
> Never? Rheem drum comes to mind...
As does Rheem RGDG furnaces with HSI, though most of the RGDG furnaces
installed in this area were standing pilot.
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Posted by on December 28, 2008, 5:00 pm
>>>>>>>I have a gas furnace, comfortmaker RPJ2 and suspect that it needs a
>>>>>>>new controller general 90 50A50-110 replacement number is 50A55-843
>>>>>>>symptom:
>>>>>>>The igniter works and burns bright, but intermittently the burners
>>>>>>>will not ignite and the the blower will just keep blowing as the house
>>>>>>>gets colder.
>>>>>>>Recycling the power to the unit seems to fix this for a while.
>>>>>>>Is there a good test I should do?
>> The HSI itself is NEVER used for 'rectifcation'.
>Never? Rheem drum comes to mind...
OK - '...except for those that do' :-)
Now - in this situation, are you interested in the amp draw of
the HSI or not ? If not, why do you assume it's good ? Or do you
just shotgun HSI and controller both ?
--
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Posted by KJPRO on December 28, 2008, 6:44 pm
>>>>>>>>I have a gas furnace, comfortmaker RPJ2 and suspect that it needs a
>>>>>>>>new controller general 90 50A50-110 replacement number is 50A55-843
>>>>>>>>symptom:
>>>>>>>>The igniter works and burns bright, but intermittently the burners
>>>>>>>>will not ignite and the the blower will just keep blowing as the
>>>>>>>>house
>>>>>>>>gets colder.
>>>>>>>>Recycling the power to the unit seems to fix this for a while.
>>>>>>>>Is there a good test I should do?
>>> The HSI itself is NEVER used for 'rectifcation'.
>>Never? Rheem drum comes to mind...
> OK - '...except for those that do' :-)
> Now - in this situation, are you interested in the amp draw of
> the HSI or not ? If not, why do you assume it's good ? Or do you
> just shotgun HSI and controller both ?
I'd bet money this furnace hasn't saw any maintenance and the problem lies
with that... along with a burner upgrade.
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Posted by on December 30, 2008, 10:46 am
> >>>>>>>>I have a gas furnace, comfortmaker RPJ2 and suspect that it needs=
a
> >>>>>>>>new controller general 90 50A50-110 replacement number is =A050A5=
5-843
> >>>>>>>>symptom:
> >>>>>>>>The igniter works and burns bright, but intermittently the burner=
s
> >>>>>>>>will not ignite and the the blower will just keep blowing as the
> >>>>>>>>house
> >>>>>>>>gets colder.
> >>>>>>>>Recycling the power to the unit seems to fix this for a while.
> >>>>>>>>Is there a good test I should do?
> >>> The HSI itself is NEVER used for 'rectifcation'.
> >>Never? Rheem drum comes to mind...
> > OK - '...except for those that do' =A0:-)
> > Now - in this situation, are you interested in the amp draw of
> > the HSI or not ? =A0If not, why do you assume it's good ? =A0Or do you
> > just shotgun HSI and controller both ?
> I'd bet money this furnace hasn't saw any maintenance and the problem lie=
s
> with that... along with a burner upgrade.
The upgrade and maintenance are rather vague terms, it is like a
mechanic telling you that your car stalls because you didn't buy a
tune up. (Tune up is mechanic code for just give me your wallet and
don't ask questions).
I can see that the burners are quite even and they seem to function
well.
I am curious, What would you upgrade the burners from and to?
The Inducer and main fan work well (by my observation). The HSI burns
very bright and was replaced 2 seasons ago, I don't have an amp tester
but I believe that it should have ignited if gas was present.
Presently the furnace is working again, so I can't do any more
troubleshooting. (often "as a mechanic" I have found that when
problems are intermittent and flakey, they are more likely to be
electrical) also due to web searches I kind of suspect the controller.
but would like to know
What are the other possibilities given the symptoms?
What should I test when this happens again?
Any other suggestions?
Thanks,
Crzzy1
PS: Symptoms:
Fan/HSI-Ignitor/inducer all appear to work ok,
The gas does not kick on and no flame happens,
The blower stays on as if it thinks it is heating the house
---
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