Compatibility Check - Meross Smart Home

Smart Wi-Fi Thermostat - MTS300 Compatibility Check

This smart thermostat is compatible with most low-voltage(24V~) HVAC systems, including single or multi-stage heating and cooling systems, heat pumps(with or without AUX heating), and fan coil units. It supports up to 2-stage cooling, 3-stage heating, 2-stage heat pump, 3-speed fan, and a humidifier or dehumidifier. The terminal definitions is shown below, you can also use the compatibility checker to check.

MTS300 Hotline: 855-516-5861

Hours: 10:30 AM – 7:30 PM (EST), Mon–Wed, Fri–Sat

Terminals	Conventional	Heat Pump	2-Pipe Fan Coil	4-Pipe Fan Coil
R	24V~ Single Transformer - Heating or Cooling
Rc	24V~ Dual Transformer - Cooling
Rh	24V~ Dual Transformer - Heating
C	Common
G	Fan
Y	Stage-1 Cool	Stage-1 Compressor	Valve	Cool Valve
Y2	Stage-2 Cool (2nd-speed Fan)	Stage-2 Compressor (2nd-speed Fan)	2nd-speed Fan	2nd-speed Fan
W/AUX	Stage-1 Heat	stage-1 AUX Heat	AUX Heat	Heat Valve
W2	Stage-2 Heat (3rd-speed Fan)	stage-2 AUX Heat(3rd-speed Fan)	3rd-speed Fan	3rd-speed Fan
O/B	N/A	Reversing Valve	N/A	N/A
E	N/A	Emergency Heat	Emergency Heat	N/A
*	Humidifier/Dehumidifier/W3/AUX3

Note:

1. This thermostat supports a 1-wire humidifier/dehumidifier or 2-wire humidifier/dehumidifier. If installing a 1-wire humidifier or dehumidifier, connect it directly to the * terminal. For a 2-wire unit, an additional 24VAC relay is required. We recommend using the 90-290Q model or a similar relay.

For more information about compatibility, please go tosupport page