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Posted by =?iso-8859-15?Q?Tekkie=AE?= on July 13, 2006, 6:17 pm
Stormin Mormon posted for all of us...
I don't top post - see either inline or at bottom.
> May I take this moment to publically thank
>
NO!
--
Tekkie
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Posted by aka-SBM on July 13, 2006, 2:51 am
> CB/SBM, you got me kinda confused here on this gaspak deal. If I were
> hooking up a cool only pkg unit to a two wire stat, I would just hook Y
> and G together at the unit if the blower relay seemed OK, otherwise just
> hook up the motor to the contactor and not mess with the relay. On this
> one, they pulled four wires and hooked them up correctly if I understood
> correctly. If this unit's blower ran when it got a green signal, what
> changed when it also got a yellow signal? The green should have still
> been energized. I'm sure if I saw the unit, it would be obvious, but
> somehow I can't visualise what you were saying the problem was. You got
> me curious-- can you please elaborate. Thx Larry
>
Actually, for a fleeting moment, the idea to connect Y and G together hit
me, but the landlord said that he wanted the fan to run independent of the
compressor...and if I did that, then every time that they turned the stat to
ON, the comp would kick in.
Now, remember its an old gas pack so the unit has a fan limit switch in it.
Its not hooked up basically, since there is no gas to it. so you forget
about the low fan speed.
The LuxPro he had to hook up to it, did not energize Y AND G just Y. I could
have tied on to the relay...sure. But see above.
So.....
Instead of adding parts he didnt need, and since the unit was being used as
straight air.....and since it was a POS anyway...
Taped off the other two fan leads. Took the high speed lead, and spliced it
so that if the stat gets a G call, the relay closes and the fan runs.
IF the unit gets a Y call, the contactor closes and energizes the same wire,
only NOT through the relay.
From the fan:
Lead goes to the fan relay. At the fan relay, a female spade has now TWO
wires leading from it. One to the fan, one to the unit load side of the
contactor, opposite of course, the common lead to the fan.
Make sense?
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Posted by lp13-30 on July 14, 2006, 1:43 am
CB/SBM, thanks for the reply, and I understand now. What I don't
understand though, is why a stat would only energize only Y and not G.
That would work with most newer furnaces-- those with a Y term on the
circuit board, but any other furnace, and most non v/s air handlers have
to have a green on a call for cooling. I do not recall ever seeing a
heat/cool stat that worked that way, but then again, I haven't seen or
messed with every stat on the market, so I dunno. Thanks again Larry
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Posted by Stormin Mormon on July 10, 2006, 3:11 pm
about ten minutes later, it hits me that the Rheem I've been
installing, it's YL and YH. Oops.
--
Christopher A. Young
You can't shout down a troll.
You have to starve them.
.
I'll admit I've not used one of these thermostats. But, from what
you're describing, I've got two ideas. The first is less likely.
1) there is a switch inside the thermostat to change from heat pump
to split system. Causes the therm to supply signal to the G lead (or
not).
2) The new thermostat shoulda been wired to Y2 instead of Y1, at the
air handler. Or the other way around. Y1 instead of Y2.
Since the customer replaced a two wire stat, you didn't say if s/he
pulled a new wire. But we'd have to guess s/he did.
--
Christopher A. Young
You can't shout down a troll.
You have to starve them.
.
Hey..you wanna show professional internet troubleshooting?
Show us...here is a simple one.
Customer calls. Has a LuxPro stat that he wants wired. Simple enough.
4
wire. No common. Just R, G Y and W......old stat was a simple COOL
ONLY
White Rodgers mercury stat.
Sep T87F for the electric furnace...Coleman if it matters..
The Lux is for the Gas-electric thats wired for AC only....leaving the
W out
of the equasion above...Old Day and Night, if it matters to you...
Now..here is the issue, and think about it real careful, cause it took
me
about 20 seconds talking to the owner to get that information posted
above
to know what the problem was.
Issue: When the Lux was turned to ON, fan position, the blower would
start
and run fine.
When the stat was set to AUTO, and COOL, and turned low enough that
the AC
would start, the compressor, condensor fan motor and nothing else
would run.
IE: No Blower.
Now, it runs fine, no matter what the setting, remember....heat is NOT
used
on the old gas-electric package unit..the gas valve is not even in the
unit..
The repair was simple as pie...what was it?
No parts replaced.
No stuck relays..
No more than a service call and 20 minutes of time to insure it all
worked
and worked correctly after a under 5 minute repair.
What was it?
Amaze us with your tech ability. Any tech thats been in the field a
bit can
figure out basic electricity. Lets see how much knowledge you really
have,
and regs, please leave this one to the new internet god of repair
advice.
Id bet the farm you aint got a clue, and if you dont Chris, be man
enough to
admit it.
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Posted by STravis on July 12, 2006, 9:03 pm
Stormin Mormon wrote:
> Well, teased you enough about the thermostat. That's a really, really
> old joke on this list.
>
> At this point, one of a couple problems come to mind. It's possible
> that the thermostat wire is worn through,a nd shorting.
>
> But, more likely there is a sticky relay inside the furnace which is
> not releasing.
If it's really a 2 wire stat, why can't he test for the 'sticky'
contactor in the furnace? ie. Pull the thermostat off (having two
exposed wires). Short wires together - furnaces comes on. Release
wires - furnace shuts off. If the furnace doesn't shut off then your
sticky relay holds true. Or does this 2 wire stat do something else?
> It is time to call a HVAC repair company. Another
> thermost is not likely to change anything except the thermostat.
>
> Please let us know how things work out.
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