circuit boards

Posted by Moe Jones on January 8, 2008, 5:56 pm

Can anyone tell me what year that gas furnaces began using solid circuit
boards?
Also a lot of today's circuit boards will allow the blower motor run after
the system shuts down. Can you tell me for how long it will allow the blower
to run?
--
Moe Jones
HVAC Service Technician
Energy Equalizers Inc.
Houston, Texas
www.EnergyEqualizers.com
We Sell Lead Free A/Cs :)

Posted by Dr. Hardcrab on January 8, 2008, 6:02 pm

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25 years?
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Depends on the board. Some you can adjust to various runs....
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Posted by jamesgangnc on January 8, 2008, 8:21 pm

Depends on the brand. 20 to 30 years I'd guess.
Generally somewhere between 30 seconds and a couple minutes. Some are
adjustable. Before circuit boards some still did this but just with a
delayed release relay. You can still buy them.
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Posted by Jeffry Lebowski on January 9, 2008, 12:06 am

> Can anyone tell me what year that gas furnaces began using solid circuit
> boards?
1968...before that time all gas furnaces all used liquid circuit boards.

Posted by CJT on January 9, 2008, 12:19 am

Jeffry Lebowski wrote:
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Not gas??
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