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Old 11-14-2012, 03:44 PM   #1
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O/T Need home thermostat help

I know this isn't Sunline related, but I could use some help. Our heating/cooling system at home has an old dial type mercury thermostat. It controls both heat and cool. There are only two wires coming from the system. The system itself, has a heat/cool switch on the front of it. When it's time to switch over, I simply flip the switch and set the thermostat to the desired temperature.

The thermostat operation has gotten very buggy and I need to replace it. I bought a non-programmable thermostat, but I'm not sure how to proceed. I have a Hunter #42995 Thermostat that I bought for the 2653, but it's needs will have to wait...

Anyone know if I can jump between the heat and cool terminals and just throw the heat/off/cool switch for what mode I need? I would still have to throw the switch on the unit itself.. That's no problem, I just wondered if my idea would work...
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Old 11-14-2012, 04:23 PM   #2
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Ok... I answered my own question... Apparently, it works as a "Heat only" thermostat. Contacts closed and the heat comes on. Contacts open and it cools. Of course, it depends on how the unit's switch is set.

Sorry for the useless thread... I'm trying to give myself something to do...
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Old 11-14-2012, 06:28 PM   #3
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No worries Gary, but this is way beyond me anyway...
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Old 11-14-2012, 07:28 PM   #4
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Gary,

The Hunter you have is a relay contact T stat. It should be able to work with your 2 wire setup. I just cannot remember if the contacts open for cooling or energize for cooling. Using your meter you can test between the Y and RC terminal and see if it opens or closes when the room temp is above the setpoint.

Do you have it up and going?

The last page in the manual shows the wiring schematic
http://www.hunterair.com/ssi/pdf/hun...ers-Manual.pdf

John
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Old 11-14-2012, 08:00 PM   #5
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I had to figure this out my own self... I should have just downloaded the manual! It's up and running perfectly!

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Old 11-14-2012, 08:11 PM   #6
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I am sure this thread and the diagram picture will help the next person with the same question.
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Old 11-14-2012, 08:57 PM   #7
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Quote:
Originally Posted by EMD_Driver View Post
It's up and running perfectly!
Great!
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