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Subject Author Date
circuit boards Moe Jones 01-08-2008
---> Re: circuit boards Jeffry Lebowski01-09-2008
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Posted by on January 9, 2008, 12:20 am
wrote:

>
>
>>
>> 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.

        So, in 1968 they moved to a different state ?


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Posted by CJT on January 9, 2008, 12:37 am
.p.jm@see_my_sig_for_address.com wrote:

> wrote:
>
>
>>
>>
>>>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.
>
>
>         So, in 1968 they moved to a different state ?
>
>
Only in phases.

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Posted by -zero on January 9, 2008, 2:08 am

> Can anyone tell me what year that gas furnaces began using solid circuit
> boards?

Circa 1981.

-zero



Posted by Zyp on January 10, 2008, 2:33 am
Moe Jones wrote:
> 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 :)

Moe;

The very very first boards I saw were on 1974 Day & Night [Bryant] gas
furnaces. They essentially were just so you could plug in the fan relay
[R80128 Honeywell ?]. They had two relays [one for high speed fan - the
other for the Electronic Air Cleaner]. Although there may have been some
earlier.

The next circuit boards I saw came out in the condensing units by Carrier
around 1974 - 1976 which at that time were called a CPCS [Compressor
Protection Cycle System] which really was not much more than an over current
protection monitor with anti short cycle. [7 minutes normal - 10 minutes on
power failure.]

Then around 1979 or so, the intermittent pilot's starting showing up, and
the boards started to provide timing for the indoor blower on heat. Today
of course the boards are much much more computer oriented with WAN
connection ability, HISTORY logging, and motor speed, gas valve timing
control.

Was that helpful? I provide this only as a free service to other
technicians in the HVAC/R trade.


--
Zyp



Posted by Moe Jones on January 14, 2008, 7:47 am
Zyp wrote:
> Moe Jones wrote:
>> 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 :)
>
> Moe;
>
> The very very first boards I saw were on 1974 Day & Night [Bryant] gas
> furnaces. They essentially were just so you could plug in the fan
> relay [R80128 Honeywell ?]. They had two relays [one for high speed
> fan - the other for the Electronic Air Cleaner]. Although there may
> have been some earlier.
>
> The next circuit boards I saw came out in the condensing units by
> Carrier around 1974 - 1976 which at that time were called a CPCS
> [Compressor Protection Cycle System] which really was not much more
> than an over current protection monitor with anti short cycle. [7
> minutes normal - 10 minutes on power failure.]
>
> Then around 1979 or so, the intermittent pilot's starting showing up,
> and the boards started to provide timing for the indoor blower on
> heat. Today of course the boards are much much more computer
> oriented with WAN connection ability, HISTORY logging, and motor
> speed, gas valve timing control.
>
> Was that helpful? I provide this only as a free service to other
> technicians in the HVAC/R trade.

Yes thank you.
Another technician and I have questioned a control that is sold around here
and I think it is not worth selling but to older furnaces.'
The control allows the blower motor to run after the system shuts down for 3
minutes.The control is mounted under the thermostat and has a LED that tell
the home owner that the control is working
The other tech says that his customers like to see the LED glow and that the
controls runs for the full 3 minutes.
To me with furnaces around 10 years old can do the same but I am not too
sure of a 3 minute run time for the circuit boards.

--
Moe Jones
HVAC Service Technician
Energy Equalizers Inc.
Houston, Texas
www.EnergyEqualizers.com

We Sell Lead Free A/Cs :)



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