TRANE XR103 thermostat TCONT103AN21MA

A push-button thermostat designed for central heat pumps

A central heat pump heats in winter, cools in summer and relies on backup heat when the cold becomes too intense. To control it, you need a thermostat that understands this logic: cycle reversal, compressor, backup heat and emergency heat. The Trane TCONT103AN21MA is a non-programmable electronic thermostat reserved for heat pumps, simple to use and free of unnecessary features.

Who it is for

This thermostat is for owners of a central heat pump with one compressor stage, with electric or other backup heat, who want to set their own temperature with buttons, without programming. It suits people who prefer to keep a steady setpoint, an approach that is in fact well suited to how a heat pump works, as well as rental units, thanks to its keypad lockout.

Compatible systems

The TCONT103AN21MA is intended for heat pumps only. It controls up to 2 heating stages and 1 cooling stage: 1 compressor stage and 1 backup heat stage. It is not suitable for a furnace on its own or for an air conditioner without a heat pump: for those systems, its sibling, the TCONT102AN11AA, is the right choice.

Configurable reversing valve

Depending on the heat pump manufacturer, the reversing valve is energized in cooling mode (O) or in heating mode (B). The TCONT103AN21MA lets you configure the O/B output: it therefore adapts to most central heat pumps, whatever convention the equipment uses.

Emergency heat

The emergency heat mode heats the house with the backup heat alone, without using the compressor. If the heat pump shuts down in extreme cold, this mode keeps the house warm while you wait for a technician. It is a temporary solution: backup heat uses more energy than the heat pump, and you need to have the equipment checked quickly.

Power

The thermostat runs on 24 V and requires a common (C) wire. During a replacement, our technicians check that it is there; if it is missing, we assess the appropriate wiring solution before installation.

Straightforward to use

Settings are made with push buttons. The 1.9 in diagonal screen displays the temperature in Fahrenheit or Celsius. The keypad lockout prevents unwanted changes.

Heat pumps and the Quebec winter

A heat pump performs best when it is allowed to run steadily. Large setpoint reductions followed by sharp increases call on the backup heat, which uses more energy. With a non-programmable thermostat, the most effective strategy is to choose a comfortable setpoint and keep it, perhaps lowering it slightly for the night. It is the simplest way to let the heat pump do most of the heating during the winter.

And in summer

The same heat pump provides cooling during the warm season. The TCONT103AN21MA controls this mode with its single cooling stage: just switch to cooling mode and adjust the setpoint. A steady setpoint, without large swings between day and night, gives consistent comfort and gives the heat pump time to remove humidity from the air on muggy July days.

Day to day

Choose heating or cooling mode according to the season and adjust the setpoint. The thermostat decides on its own to call on the backup heat when the compressor is no longer enough. Keep emergency heat for situations where the heat pump is not working.

Understanding the role of backup heat

The backup heat of a central heat pump, often made up of electric elements in the indoor unit, supplements the compressor when the compressor alone can no longer maintain the temperature. The TCONT103AN21MA controls this backup heat as a second heating stage: it starts the compressor first, then adds the backup heat if the temperature keeps dropping. This staged control lets the heat pump be used first, which is the key to keeping your heating bill under control.

Placing the thermostat correctly

With a heat pump, an accurate reading matters even more, since a temperature discrepancy can trigger the backup heat when it is not really needed. We install the thermostat on an interior wall, away from supply vents, sunny windows and exterior doors.

Before you buy

Check three points with us: your equipment is indeed a heat pump with one compressor stage, your wiring includes a C wire, and manual adjustment suits you. If any of these points does not match, another model in the Trane lineup will be a better fit.

103 or 102

The TCONT103AN21MA and the TCONT102AN11AA share the same format, the same screen and the same buttons. The 103 is designed for heat pumps, with an O/B output, emergency heat and keypad lockout, and requires a common wire. The 102 controls single-stage furnaces and air conditioners and runs on batteries only. If you want to program your heat pump, the TCONT203AS42MA offers 7-day or 5/1/1 programming and handles up to 4 heating stages.

Technical specifications

• Stages: up to 2 heating / 1 cooling (heat pump only): 1 compressor stage and 1 backup heat stage
• Systems: heat pump only
• Power: 24 V; common wire required
• Non-programmable, push buttons
• 1.9 in diagonal screen
• Configurable reversing valve (O/B)
• Emergency heat
• Keypad lockout
• Fahrenheit or Celsius display
• Connectivity: none
• Dimensions: 3.88 in H x 5.5 in W x 1.18 in D
• Colour: glossy white

Installation by AirGreen technicians

The installation

Our technicians identify your heat pump, its reversing valve convention and its type of backup heat. They check for the C wire, connect the thermostat and configure the O/B output. Each mode is then tested: compressor heating, backup heat, emergency heat, cooling and ventilation. We also make sure the thermostat's location gives a reading that is representative of the house.

Maintenance

Wipe the case with a dry cloth. Have your heat pump serviced every year, keep the outdoor unit clear of snow and ice in winter, and clean or replace the filter regularly.

Why AirGreen

AirGreen Inc. is a family-owned HVAC company from Montreal, in business for more than 15 years, holding an RBQ licence and with a showroom in Boucherville. Central and wall-mounted heat pumps are part of our everyday work, and we know how to configure a thermostat to get the best out of them.

For the purchase and professional installation of the Trane TCONT103AN21MA thermostat, contact AirGreen. We serve Montreal, Laval, Longueuil, the North Shore and the South Shore.