TRANE ComfortLink II XL850 thermostat TCONT850AC52UC

A Trane ComfortLink II system is built to talk: the outdoor unit, the indoor unit and the wall control constantly exchange information about demand, airflow and the status of each component. The Trane XL850 TCONT850AC52UC is the control that speaks this language. This communicating smart thermostat makes the most of the line's two-stage and variable-speed equipment, with a 4.3 in colour touchscreen, a Wi-Fi or Ethernet connection and a built-in Z-Wave Plus bridge.

The communicating control for ComfortLink II systems

Why a communicating control

With a conventional 24 V thermostat, the equipment only receives simple commands: heat, cool, fan. With a communicating control, it receives precise instructions and sends information back. A two-stage or variable-speed system can then match its capacity closely to the need, rather than running at full power in short cycles. The result: a steadier temperature, quieter operation and energy use that better follows the home's actual needs.

Compatible systems

The XL850 is designed for Trane ComfortLink II communicating systems. It controls up to 5 heating stages and 2 cooling stages and supports variable-speed and two-stage communicating equipment, including heat pumps. It can also control conventional 24 V equipment through an interface relay panel, which offers a solution for homes where part of the equipment is not communicating. It is powered by 24 V, with a typical consumption of 3 VA and 7 VA maximum.

Display, programming and humidity

The 4.3 in colour touchscreen, measured diagonally (4.15 x 2.65 in), clearly shows the temperature, the schedule and the system status. 7-day programming allows up to four periods per day. The thermostat displays indoor relative humidity and offers enhanced dehumidification: in cooling mode, the communicating system can slow the airflow to remove more moisture, a real advantage on muggy Montreal summer days.

Remote access and the connected home

The XL850 connects over Wi-Fi (802.11 b/g/n) or by Ethernet. With the Trane Home app, you can reach it from a phone, tablet or computer. Its built-in Z-Wave Plus bridge lets you link compatible Z-Wave devices and bring several home functions together in a single app.

Trane diagnostics

Trane diagnostics use the information exchanged by the communicating system. If something goes wrong, the thermostat and the equipment have useful data to point the diagnosis in the right direction. For you, that means more targeted service calls.

Optional sensors

The XL850 accepts a BAYSEN01ATEMPA outdoor sensor, a ZZSENSAL0400AA wired indoor sensor and a ZSENS930AW00MA wireless indoor sensor, sold separately. The outdoor sensor is useful with a heat pump, and the indoor sensors let you regulate based on the temperature of a specific room rather than that of the hallway.

A Quebec winter with a variable-speed system

In extreme cold, a variable-speed communicating system runs for long periods at moderate output instead of starting up again and again. Rooms stay at a more even temperature, air circulates gently and the equipment is under less strain from on-off cycling. Combined with programming that lowers the setpoint at night and while you are away, this approach helps keep energy use in check throughout the heating season.

Who it's for

The XL850 is for owners of a ComfortLink II system who are replacing a worn-out communicating control or who want to get the most out of new two-stage or variable-speed equipment. It suits single-zone homes that want a precise, connected control able to link a few Z-Wave devices, without needing the large screen and zoning of the XL1050.

The XL850 in the ComfortLink II family

The XL850 is the compact communicating control in the line. The XL1050 moves up to a 7 in colour display, adds voice control through Alexa and Home, Away and Sleep presets, and supports zoning with a ComfortLink II zone panel. For a conventional 24 V system of any brand, the XL824 or the Priority is a better fit. The XL850 is the natural choice for a single-zone home with a ComfortLink II system.

Specifications

• Stages: up to 5 heating / 2 cooling; variable-speed and two-stage communicating systems
• Systems: Trane ComfortLink II communicating systems (or conventional 24 V equipment through a relay panel)
• Power: 24 V; 3 VA typical, 7 VA maximum
• 4.3 in diagonal colour touchscreen (4.15 x 2.65 in)
• Connectivity: Wi-Fi 802.11 b/g/n or Ethernet; built-in Z-Wave Plus bridge
• Trane Home app; remote access by phone, tablet or computer
• 7-day programmable, up to 4 periods per day
• Indoor relative humidity display and enhanced dehumidification
• Trane diagnostics
• Optional sensors: outdoor BAYSEN01ATEMPA, wired indoor ZZSENSAL0400AA, wireless indoor ZSENS930AW00MA
• Dimensions: 5.43 in W x 3.39 in H x 1.30 in D

Installation and configuration by AirGreen

A communicating installation done right

Our technicians first identify the components of your system and check that they are ComfortLink II compatible. The XL850 is connected to the communication bus, then the system is configured: the equipment is recognized, the staging and airflow settings are validated and every mode is tested. If part of the equipment is conventional, we add the required relay panel.

Commissioning

We connect the thermostat to your Wi-Fi or by Ethernet cable, pair the Trane Home app and set up a starting schedule. The optional sensors are installed and tested at the same time, and we show you how to check the humidity and turn on dehumidification.

Maintenance

Wipe the screen with a soft, dry cloth. Annual servicing of the indoor and outdoor units, along with regular filter replacement, keeps the communicating system performing as it should.

Why AirGreen

AirGreen Inc. is a family-owned HVAC company that has been based in Montreal for more than 15 years, holds an RBQ licence and has a showroom in Boucherville. We install and service central systems and heat pumps, and we take the time to configure communicating controls properly.

To buy the Trane ComfortLink II XL850 TCONT850AC52UC thermostat and have it professionally installed, contact AirGreen. We serve Montreal, Laval, Longueuil, the North Shore and the South Shore.