The Low Profile Programmable Stat that's High in
You will appreciate the SlimLine Programmable
Thermostats that are designed to blend in with any decor and be
barely noticeable on the wall. But don't let the low profile fool
you. They are loaded with features, like self-prompting programming
that more expensive thermostats only wish they had. All can be heat
pump or heat cool. These thermostats will look so good and work so
well that you will forget they're even there but won't forget
that you installed them.
Infrared remote operation allows for basic
thermostat functions. Unique "warmer" and "cooler" commands make
this extremely simple to use.
How to add a Common wire on older 4-wire Thermostat Systems
This is a common problem when replacing a mechanical thermostat or a thermostat powered by batteries. These older thermostats require 4 wires, but newer more sophisticated thermostats require a 5th wire known as the Common wire to power the digital display. There are three ways to add the common wire to a four wire installation:
Note: Before starting, we recommend that you take a picture of the original wiring to the old thermostat as reference to help remember what terminal each thermostat wire was connected to.
Option #1: The easiest and least expensive option is to sacrifice independent control of your indoor fan.
- First, disconnect power from your heating and/or cooling system.
Caution: if your heating and cooling system is powered during the thermostat installation process and you accidentally touch the R (red) power wire to the C (blue or brown) common wire, then you will permanently damage either the equipment fuse or the transformer in the equipment.
- After disconnecting power from your heating and/or cooling system, move the wire connected to the G terminal (typically green) that controls your indoor fan to the C terminal (common) on the thermostat.
- At your heating and cooling equipment repeat the same step and move the G terminal wire to the C terminal.
- At your heating and cooling equipment place a jumper wire from the Y equipment terminal to the G equipment terminal. This will allow the fan to turn on when the thermostat is calling for cooling or heating but it will not give you independent fan control from the thermostat.
- See diagram below for wiring instructions.
Option #2: The second way to add a wire is to install the Add-A-Wire accessory. Add-A-Wire allows two thermostat signals to be controlled from one thermostat wire. As above move the green wire from the G terminal to the C terminal on the thermostat and at your heating and cooling equipment. Now use the Yellow wire to carry the Add-A-Wire signal.
Add-A-Wire Diode and Add-A-Wire Box:
In applications where additional wiring cannot be run, the Add-A-Wire accessory can be used to add a wire to the thermostat.
- Easy to install
- Easier than running new wire
- Allows 5 wire thermostats to use only 4 wires
- Also allows 5 wires to work like 6 wires
Option #3: The final way to add a wire is to contact a licesned HVAC contractor. This contractor will be able to run the necessary number of thermostat wires from your heating and cooling system to your thermostat. Please visit the Distributors section of our website to find the nearest HVAC wholesale distributor to your location. You may contact any of these distributors for an HVAC contractor referral in your area.