Digest for sci.electronics.repair@googlegroups.com - 13 updates in 4 topics

Tony Hwang <dragon40@shaw.ca>: Dec 27 03:08PM -0700

Jerry Peters wrote:
 
> That depends on the furnace. MY blower comes on as soon as the burner
> ignites, it's a high efficiency furnace, so the blower must start to
> cool the secondary heat exchanger.
 
How high efficiency? Ours are 96% 2 stage one. There is built-in delay
for blower to come one. Off delay is adjustable by dip switches. Inducer
blower purges vent already before ingnition comes on.
Tony Hwang <dragon40@shaw.ca>: Dec 27 03:09PM -0700

Jerry Peters wrote:
 
> That depends on the furnace. MY blower comes on as soon as the burner
> ignites, it's a high efficiency furnace, so the blower must start to
> cool the secondary heat exchanger.
 
Sounds funny, then your system will blow cool air before warm air start
blowing out.
thekmanrocks@gmail.com: Dec 27 02:22PM -0800

Tony Hwang wrote: "- show quoted text -
Sounds funny, then your system will blow cool air before warm air start
blowing out. "
 
Ever hear of a 'return' in a force air system? That should engage
first, before the hot end of things does.
Mark Lloyd <not@mail.invalid>: Dec 27 12:28PM -0600

On 12/26/2015 02:37 PM, Kirk Landaur wrote:
 
[snip]
 
> hysteresis is built in? Is it in the computer? Is there a dial
> that sets the temperature range of the hysteresis? Is there
> a potentiometer?
 
The mercury switch provides some hysteresis.
 
 
--
Mark Lloyd
http://notstupid.us/
 
"In fact, when you get right down to it, almost every explanation Man
came up with for *anything* until about 1926 was stupid." [Dave Barry]
"pfjw@aol.com" <pfjw@aol.com>: Dec 27 05:31PM -0800

The 'anticipator' lives on the stat. Not in the system. 'Lowest' setting. It is still between the gas valve and the valve's power source. That is the specific issue.
 
Peter Wieck
Melrose Park, PA
"pfjw@aol.com" <pfjw@aol.com>: Dec 27 05:40PM -0800

For the record, 99-44/100ths of all residential forced air systems do not, repeat!, do not have an independently forced return. They are closed systems with what is best described as a "plenum" (central) return. Usually it is a large floor duct somewhere near the furnace. Essentially, it is the make-up air for the supply.
 
There is a great deal of bad information out there. Please DO try to verify any information from a reliable source before taking any irreversible action(s).
 
Peter Wieck
Melrose Park, PA
thekmanrocks@gmail.com: Dec 27 07:41PM -0800

8:31 PMpf...@aol.com wrote:
"The 'anticipator' lives on the stat. Not in the system. 'Lowest' setting. It is still between the gas valve and the valve's
power source. That is the specific issue.
- show quoted text -"
 
Most of us here know where the anticipator is located.
"pfjw@aol.com" <pfjw@aol.com>: Dec 28 07:43AM -0800

> power source. That is the specific issue.
> - show quoted text -"
 
> Most of us here know where the anticipator is located.
 
They do. But, not to be snarky, there are vanishingly few residential systems out there with forced returns. Few, even in commercial forced air systems. I was involved ONCE (1 time) with a system that had fully ducted supply and returns, this in an academic building of 425,000 square feet. It also had oxygen and CO2 sensors in the classrooms, ran on a VAV based system using constant-velocity variable-vane axial fans on both the supply and returns. It was a high-volume, low pressure system to reduce noise and maintain high air quality. It could vary from a minimum of 10% 'new' air to 100% new air. That, for the record, is the only forced-return system that I have been directly involved with - others exist, I am sure - but mostly in commercial/institutional applications, and most of those also VAV based.
 
Peter Wieck
Melrose Park, PA
Cursitor Doom <curd@notformail.com>: Dec 27 08:34PM

On Sun, 27 Dec 2015 06:14:17 -0500, JW wrote:
 
> http://bee.mif.pg.gda.pl/ciasteczkowypotwor/
 
> There appears to be several hundred gigabytes of manuals!
> Have fun!
 
Many thanks for that pointer!
"Percival P. Cassidy" <Nobody@NotMyISP.net>: Dec 28 08:18AM -0500

On 12/27/2015 06:14 AM, JW wrote:
> http://bee.mif.pg.gda.pl/ciasteczkowypotwor/
 
> There appears to be several hundred gigabytes of manuals!
> Have fun!
 
No RCA!?
 
Perce
c4urs11 <c4urs11@domain.hidden>: Dec 28 01:31PM

On Mon, 28 Dec 2015 08:18:56 -0500, Percival P. Cassidy wrote:
 
>> Have fun!
 
> No RCA!?
 
> Perce
 
Seems pretty useless whining here.
Be happy or polish up your Polish.
 
Cheers!
"Kenny Cargill" <me@privacy.net>: Dec 28 09:42AM

I used to fix TV's and with that came many faulty remotes. I dismantled
them, washed the membrane, buttons and case with Fairy or similar and
cleaned the carbon pads and PCB with Servisol switch cleaner and/or
isopropyl. Broken PCB tracks could with care be fixed, often with
conductive paint, and breakages around the legs of crystals & IR LED's were
common and easily fixed or replaced.
 
Kenny
 
"John Heath" wrote in message
news:24bea72f-83ac-4a88-8e3d-17f413057537@googlegroups.com...
 
On Sunday, December 27, 2015 at 4:31:28 PM UTC-5, N_Cook wrote:
> pushing your fingers through mock leather covering on the long edge
> farthest fromthe hinge section. That edging traps the mock leather in
> the gap between the 2 case parts
 
This reminds me. Take a cell phone picture of the front of the calculator
first before disassembling. All the buttons will fall out making it a
challenge to put them all back where they belong without a picture for a
guild. Been there done that and I paid the price for not taking a picture
before hand.
 
 
--- news://freenews.netfront.net/ - complaints: news@netfront.net ---
Micky <NONONOmisc07@bigfoot.com>: Dec 27 07:57PM -0500

Thanks again.
 
 
On Sat, 26 Dec 2015 12:39:07 -0500, "Paul M. Cook" <pmcook@gte.net>
wrote:
 
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