Nuheat Harmony HMY110 HMY220 Programmable Floor Heating Thermostat

Nuheat Harmony Programmable Floor Heating Thermostat HMY110 HMY220

The Nuheat Harmony is a programmable thermostat designed to control electric floor heating systems. Available in both 120VAC and 240VAC versions, the Harmony regulates heating output based on the selected temperature and measured floor temperature.

Designed for indoor electric underfloor heating applications, the Harmony provides programmable temperature control with a customizable heating schedule. It can be configured for different floor types and includes a selectable floor temperature limit for laminate and engineered wood flooring.

Key Features

• Designed for electric floor heating and underfloor heating applications
• Available in 120VAC and 240VAC models
• 120VAC model: HMY110
• 240VAC model: HMY220
• 15A maximum resistive load
• Maximum load of 1,800W at 120VAC
• Maximum load of 3,600W at 240VAC
• Programmable heating schedule
• Automatic operating mode
• Manual operating mode
• Temporary temperature override
• Built-in floor temperature sensor connection
• Floor temperature control
• Selectable floor temperature limit
• Normal floor temperature limit for ceramic and concrete floors
• Reduced floor temperature limit for laminate and engineered wood floors
• Built-in Class A 5mA GFCI protection
• GFCI test and reset functions
• Temperature display in Celsius or Fahrenheit
• 12-hour or 24-hour time display
• Digital display
• Wall-mount installation

What's Included

• 1 Nuheat Harmony programmable thermostat
• Floor temperature sensor
• Mounting hardware
• Installation instructions

Programmable Floor Heating Control

The Harmony allows users to program their electric floor heating system according to their daily schedule. The thermostat can automatically control the floor heating system according to the programmed temperature settings, helping provide comfortable floors when heating is needed while reducing unnecessary heating during other periods.

The thermostat can also be operated manually when a programmed schedule is not required. A temporary temperature adjustment can be made without permanently changing the programmed schedule.

Automatic and Manual Operating Modes

The Harmony provides Automatic and Manual operating modes. Automatic mode follows the programmed heating schedule, while Manual mode allows the desired floor temperature to be controlled directly.

The temporary bypass feature allows the temperature setpoint to be temporarily changed while the thermostat remains in its programmed operating schedule.

Floor Temperature Control

The Harmony uses an external floor temperature sensor to monitor and control the temperature of the heated floor. The thermostat activates the heating system when the measured floor temperature is below the selected setpoint and stops heating when the desired temperature is reached.

The floor temperature sensor also allows the thermostat to monitor the floor temperature when a temperature limit is configured.

Floor Temperature Protection

The Harmony includes a selectable floor temperature limit designed for different flooring materials. In the Normal setting, intended for ceramic and concrete floors, the maximum floor temperature is 104°F (40°C).

For laminate and engineered wood flooring, the thermostat can be configured to the Limited setting, which restricts the maximum floor temperature to 82°F (28°C). Nuheat specifies that the Limited setting must be used for laminate and engineered wood floor applications.

Built-In Class A GFCI Protection

The Harmony includes Class A 5mA GFCI protection designed to help protect against electrical ground faults. Dedicated Test and Reset functions allow the GFCI to be tested and reset.

When the GFCI detects a leakage current exceeding

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