Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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I am trying to replace an old Robertshaw thermostat on an American Standard heat pump with a Honeywell RTH3100C. There are only 4 wires going to the old Thermostat, W O G and Rc. It looks like the Rc wire has a Jumper going to an Rh terminal and the W wire wraps around a Y terminal on the old thermostat before going to the W terminal. How do I wire the new Honeywell thermostat

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 96 Answers

SOURCE: Upgrading Thermostat

Looks like your system is a heatpump system and that t-stat will not run a heatpump , you need a t-stat for 2heat and 1 cool systems

Posted on Feb 01, 2009

  • 189 Answers

SOURCE: My problem is....On my new Honeywell RTH230B

First you are using abnormal wire colors for a furnace. Second.... if you have an air conditioner hooked up to this furnace, you will need to install a jumper wire between rh & rc. I am assuming this is a natural gas furnace. Usually the red wire to R terminals. Usaully the white wire to the W terminal. Take the door off of the furnace. Find the thermostat wire connection in the furnace. What ever color wire is on the R terminal in the furnace should hook to the R terminal on the t/stat. Whatever color is on the W in the furnace goes on the W on the t/stat. Whatever color is on the G terminal in the furnace goes to G on the t/stat. And the Y in the furnace to the Y on the stat. and the G in the furnace to the G on the stat. Most applications use only the R, W, G, & Y ( always put the jumper wire between Rh & Rc)
Good Luck
Hvac Teacher

Posted on Mar 28, 2009

  • 24 Answers

SOURCE: Honeywell RTH 230B Thermostat Wiring

put the jumper back in RC and RH and that should do it.

Posted on Apr 15, 2009

  • 1015 Answers

SOURCE: Honeywell RTH 221 Programmable Thermostat. Jumper missing

The proper way to do it would be to use a small piece of wire stripped at the ends. Then use a small amount fo solder on each end to connect RC to RH. Or use a small piece of solid(stiff) wire and strip the ends. The wrap the ends around the connector and crimp them to make contact. I would not use a paper clip. A paper clip is not designed to carry 24volt current and could melt.

Posted on Nov 02, 2009

heatman101
  • 43501 Answers

SOURCE: Wiring problem?

Hi,
Yes to everything!!
You have it figured out!!
Just make SURE that the blue unused wire cannot touch any of the other wires, it will wreck your transformer in a split second.!

I hope that this will help you to solve your problem!

Thanks for using Fixya!!

Heatman101

Posted on Nov 25, 2009

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