Digital Thermostat

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The person intended killfiled the foul mouthed verbal abuser a couple days ago. But, based on the text which I deleted, it made perfect sense.
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Christopher A. Young
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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
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I'm not SBM, but I think he said that the old stat sent power to Y and G both during a call for cooling.
May I take this moment to publically thank my Lord and Saviour that I am not CB/SBM. There are some blessings that are impossible to describe in words.
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Christopher A. Young
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Stormin Mormon posted for all of us... I don't top post - see either inline or at bottom.

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Tekkie

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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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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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about ten minutes later, it hits me that the Rheem I've been installing, it's YL and YH. Oops.
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Christopher A. Young
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Stormin Mormon wrote:

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?

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Yep, that works. A heating only stat is just a temperature activated SPST switch.
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Christopher A. Young
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Dont know but heres how to find out.
W and RH are the right terminals for straight heat. If you take off either one at the stat and the furnace dont shut off then the wires are shorted together or there is a problem in the furnace. To narrow it down go to the furnace and take off either R or W, if it shuts off replace the stat wire and if not, call a tech.
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35g2000cwc.googlegroups.com:

Get a Honeywell or maybe White Rogers. You get what you pay for.
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