2012年2月19日日曜日

How To Wire Thermostat

how to wire thermostat

How To Replace A Thermostat

So you want to change a thermostat.  Perhaps you are upgrading to a programmable thermostat (which I highly recommend), or maybe the thermostat you are using isn't working properly and needs to be replaced.  In any case, the steps required to remove the old thermostat and install the new one are basically the same whether you are installing a regular thermostat or a programmable one.  Here's how to change a thermostat in 5 easy steps.

Step 1: Turn off the power

As with any home maintenance project, if you're working on an electrical system you need to be sure the power is off before you begin.  Locate the appropriate breaker on your electrical panel and verify that the power is off at the thermostat with a digital volt meter or similar device.  You don't want to forget to do this or you might get a nasty surprise later.  If you're not sure how to turn the power off, you need to find someone competent who can help you.

 

Step 2: Remove the cover and mounting screws


Lux TX9000TS Touch Screen Seven-Day Programmable Thermostat
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Your thermostat will have a decorative plastic cover.  You need to remove this by simply popping it off.  You shouldn't need any tools for this part.  Next, find and remove the mounting screws which hold the thermostat to the electrical box in the wall.  There should be 2 screws to remove.

 

 

Step 3: Pull the thermostat away from the wall and disconnect the wires

Once the mounting screws are loose, you need to pull the thermostat out and away from the wall so that you can gain access to the wires.  The wires of the thermostat are held together with the wires coming from the wall with colored connectors called marettes.  Pay attention to how the wires are attached.  Unscrew the marette and you should be able to disconnect the wires and thermostat completely.  At this point you should be left with 2 wires with bare ends sticking out from the wall and a thermostat in your hand.  You're now ready to install the new thermostat.

 


Honeywell RTH7600D Touchscreen 7-Day Programmable Thermostat
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Step 4: Connect wires and secure with a marette

Using the instructions that came with your new thermostat, connect the wires to the house system wires.  Simply twist the copper wire ends together and screw on a marette.  The marette will hold the wires tightly together so that they don't separate.  Once the marette is on, you shouldn't be able to see any exposed copper sticking out below the marette.  If you do, remove the marette, cut off a little bit of the copper wire with wire cutters and re-install the marette.

 

 

Now that your thermostat is fully connected, you can push the wires back into the electrical box in the wall and secure the thermostat unit using the mounting screws.  This part is essentially the reverse of step number two.

 


 

Step 5: Re-install the thermostat cover and turn on the power

At this point, your thermostat is wired properly and is attached to the wall.  Now you can put the cover back on (attach the main unit if you are installing a programmable thermostat).  Everything is set to go, except that you need to turn the power back on.

Once the power is back on, you can verify that the new thermostat is working by turning it on and checking to see if the heater is working.  If you installed a programmable thermostat, you'll need to follow the manufacturer's instructions in order to program the thermostat first.

 

The moment of truth

With any luck your new thermostat will work without problems!  This is an easy job once you are familiar with the basic steps and shouldn't take much longer than about 10 minutes if you're the handy type.  If you installed a programmable thermostat, congrats to you as it will make your life much more comfortable and will probably save you some money too.



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