Description
MRCOOL XK-120D2 Wired Thermostat for Signature Series TruInverter Split Systems
Solution Statement
The MRCOOL XK-120D2 is a dedicated wired thermostat designed specifically for the Signature Series TruInverter central ducted split heat pump system. Unlike generic thermostats, the XK-120D2 communicates directly with the TruInverter control board to enable full inverter modulation, precise temperature control, and access to all system operating modes including heating, cooling, fan-only, and auto modes. This thermostat is required for proper system operation and is not included with the air handler or condenser.
Key Features
- Dedicated wired thermostat for MRCOOL Signature Series TruInverter systems
- Direct communication with TruInverter inverter control board
- Supports all operating modes: Heat, Cool, Fan Only, Auto, Emergency Heat
- Precise temperature control with inverter modulation capability
- Clean, professional wired installation — no Wi-Fi dependency
- Compatible with 24K, 36K, 48K, and 60K BTU TruInverter systems
- Simple 2-wire communication connection to air handler
Technical Specifications
| Specification | Value |
|---|---|
| Model Number | XK-120D2 |
| Type | Wired Thermostat |
| Compatible Systems | MRCOOL Signature Series TruInverter Split Systems |
| Operating Modes | Heat, Cool, Fan Only, Auto, Emergency Heat |
| Connection Type | Wired (2-wire communication) |
| Voltage | 24V (powered by air handler) |
| Compatible BTU Sizes | 24K, 36K, 48K, 60K BTU |
| Refrigerant | R-454B |
Installation Information
The XK-120D2 connects to the Signature Series TruInverter air handler via a dedicated 2-wire communication cable. The thermostat is powered by the air handler's 24V transformer — no separate power source is required. Mount the thermostat on an interior wall approximately 5 feet from the floor, away from direct sunlight, drafts, and heat sources. Follow the MRCOOL installation manual for wiring diagrams and configuration settings.
Product Tips
- This thermostat is specifically designed for the Signature Series TruInverter — do not substitute with a generic thermostat as it will not enable inverter modulation.
- Use 18-gauge 2-conductor wire for the thermostat connection — longer runs may require 16-gauge wire.
- Mount on an interior wall away from windows, exterior walls, and supply air registers for accurate temperature sensing.
- The thermostat is powered by the air handler — ensure the air handler is powered before testing thermostat operation.
- Register your complete system with MRCOOL to activate the full warranty on all components including the thermostat.
FAQ
Is this thermostat required for the Signature Series TruInverter system?
Yes. The XK-120D2 is the dedicated wired thermostat for the Signature Series TruInverter and is required for proper system operation. Generic thermostats will not enable full inverter modulation or access all operating modes.
Can I use a smart thermostat instead?
The XK-120D2 wired thermostat is specifically designed for the TruInverter communication protocol. Contact MRCOOL technical support to verify compatibility with third-party smart thermostats before purchasing.
Is the thermostat included with the air handler or complete system?
The XK-120D2 thermostat is not included with the air handler or complete system and must be purchased separately.
What wire is needed for the thermostat connection?
Use 18-gauge 2-conductor wire for runs up to 50 feet. For longer runs, use 16-gauge wire to minimize voltage drop.
What is the warranty on the XK-120D2?
MRCOOL provides a limited parts warranty on the XK-120D2 thermostat. Register your product at mrcool.com to activate full warranty coverage.
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