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Electrician Training Electrical Certification wiring recessed light fixtures Electrical Wiring Electrical Troubleshooting and Electrical Repairs wire outdoor light fixture Home Electrical Wiring Diagrams
wiring home generator and transfer switch wiring a 220 volt range cord outlet Wiring for GFCI Outlets Wiring Outlets and a Switched Outlet How to Installing and Wire Ceiling Fans and Remote Controls wire dimmer switch wiring diagrams for switches wiring a dryer cord and 220 outlet circuit breaker panel
Electrical Wire and Cable

Thermostat Wiring

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Summary: Replacing a thermostat can be tricky because of the variety of colors of the electrical wiring used for to control the unit.


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Question :
Replacing Honeywell t6160 room stat
(Mains, 3-wire)with Horstmann DRT2
(Battery operated, 2-wire).Maker says live to common and switched live to no - Normally Open but does not understand third wire which goes to `call` in JB then, via link to another terminal, to motor valve (3 port, motor open, motor close). It is not live whether stat calls for heat or not. Should I disconnect it and isolate? Can the one wire make the valve actuator open to either port and return it to center as well?

Name : Ian
Hi Ian - Great Question!
I would have to see the wiring diagram to understand the function of the valve actuator.
In my experience it is essential that when replacing stats that they are a direct match to ensure that they do operate all the components of the system.
If you do have a direct replacement then you may have to look very carefully at the instructions and match up the colors of your stat wires with the terminology and abbreviations of the wiring diagrams, and many of them will be a challenge - been there, done that, and I end up making a cross reference chart to map it all out just to be sure.

The abbreviations are as follows:
comm = Common, should be the common side of the control voltage fro the unit's transformer.
no = Normally Open (and nc = Normally Closed - Normally being the un-energized state )
call = Calling for Heating/Cooling - should be the signal back to the unit to begin the start process.
Again - you are really going to have to study the original wiring and new instructions and map it out.
I always encourage others to write down the wiring of the original stat, take a picture of it, or in a case where the wires are long enough I just cut the wires off the original stat so that the original connections stay on the original stat along with the insulation colors showing so you will know what wire went to what terminal, then just transpose this pattern to the new stat.
Also - be aware that some units have fuse protection for the control voltage transformer, some do not.

Thermostat Wiring:
Comm = Common
NO = Normally Open
NC = Normally Closed


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Electrical Tips to Help You Wire it Right

The Safest Way to Test Electrical Devices and Identify Electric Wires!

The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.

The Quickest Way to Check for Faulty Electrical Wiring!

The Plug-In Outlet Tester
This is the first tool I grab to troubleshoot a problem with outlet circuit wiring. This popular tester is also used by most inspectors to test for power and check the polarity of circuit wiring.
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The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
This handy tool has multiple uses:
The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation.
The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets..

The wire stripper will work on both solid and stranded wire. This tool is Very Handy and Easy to Use.





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