Application

Wireless Thermostat Retrofits

Review options for relocating room control or sensing when existing thermostat wiring limits the installation.

A poorly placed thermostat or limited cable can make a replacement more complicated. Wireless equipment communication and remote temperature sensing offer different ways to address those constraints.

Choose the appropriate approach

  • Separate room thermostat and equipment module: the PRO1 T755WHO PROsync system uses wireless communication between these devices. Equipment wiring terminates at the module, which needs its own power supply.
  • Keep two thermostat power wires: the Prestige IAQ YTHX9421R5085WW kit uses two wires for thermostat power and RedLINK communication to its included equipment interface module.
  • Add a room sensing location to Pelican: the battery-powered RT1-DC communicates with compatible Pelican controls. It does not directly switch heating or cooling equipment; the master controller and gateway remain part of the system.

Before selecting

Confirm the equipment stages, existing conductor count, module power, and installation locations. Review wireless placement and pairing requirements, especially around metal enclosures. Choose accessories from the exact supported system: PROsync, RedLINK, and Pelican components are not interchangeable.

A Wi-Fi thermostat may still require conventional control wiring at the wall. Check whether the proposed product replaces the control cable, moves only the sensing point, or provides Internet access to an otherwise wired thermostat.

See Remote Temperature Sensing & Averaging when the primary goal is measuring temperature in another room.

Manufacturer references

PRO1 T755WHO

PRO1

PRO1 T755WHO PROsync Wireless Thermostat System

Model T755WHO SKU 107350

The T755WHO PROsync system separates the main room thermostat from the wired equipment module.

Heating and cooling stages
Up to 2 heat / 2 cool conventional; 4 heat / 2 cool heat pump
Power sources
Main thermostat: 2 AA alkaline batteries or hardwired 18–30 VAC; equipment module: hardwired power required

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Prestige IAQ YTHX9421R5085WW Thermostat Kit

Honeywell Home

Prestige IAQ YTHX9421R5085WW Thermostat Kit

Model YTHX9421R5085WW SKU 365480

White Prestige IAQ kit containing a thermostat, equipment interface module and two duct sensors.

Heating and cooling stages
Heat pump: Up to 4 heat / 2 cool; Conventional: Up to 3 heat / 2 cool
Power sources
18–30 Vac hardwired

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Pelican Wireless RT1-DC

Pelican Wireless

Pelican Wireless RT1-DC Battery-Powered Remote Thermostat

Model RT1-DC SKU 190110

Battery-powered Pelican remote temperature sensor and adjustment interface for a compatible thermostat or TCM1 controller.

Measured variables
Temperature
Communication protocols
Pelican wireless mesh; this battery model does not repeat wireless signals
Mounting
Interior wall or electrical box, horizontal orientation

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Pelican Wireless TC1

Pelican Wireless

Pelican Wireless TC1 Commercial Thermostat

Model TC1 SKU 190132

Connected commercial thermostat with temperature sensing for Pelican building controls. Requires a Pelican Gateway.

Supply voltage
24 V AC nominal, 60 Hz; operating range 23–30 V AC
Communication protocols
Pelican mesh network; not Wi-Fi
Power sources
Hardwired AC

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