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White rectangular thermostat with vertical mounting and terminal labels visible

Emerson Climate Technologies

Emerson Climate Technologies 1E56N-444 Low Voltage Thermostat

SKU CH-0WRM-H0XNE

Low-voltage thermostat with heat, cool and fan switching for heating, cooling, heat-pump and millivolt systems

  • TypeThermostat Accessories
  • ColorWhite
  • Low-voltage operation from 20 to 30V AC
  • Mercury-free design for safer installation
  • Heat, cool and heat-pump compatibility without auxiliary heat
  • Millivolt and 750mV system support included
  • Vertical mount fits standard 4 1/2 in height

Low-Voltage Thermostat for Heat/Cool Systems

The Emerson 1E56N-444 is a low-voltage analog thermostat designed for residential heating and cooling control. It suits installers and homeowners who need a straightforward, mercury-free device for standard HVAC equipment. The unit mounts vertically and operates on 20 to 30V AC hardwired power.

Terminal Layout and System Compatibility

Terminal designations A, B, G, O, RC, RH, W and Y provide connections for conventional heat/cool systems, heat pumps without auxiliary heat, millivolt circuits and 3-wire zone valves. A system switch selects Heat, Cool or Off while a fan switch toggles Auto and On. Dual-transformer compatibility adds wiring flexibility for mixed-voltage installations.

Control Range and Millivolt Limits

The adjustable control range spans 50 to 90 degrees F, covering typical comfort settings for occupied spaces. Millivolt compatibility at 750mV supports gas-fired appliances and hydronic zone valves that generate their own low-voltage signal. The thermostat does not support auxiliary heat stages, multi-stage cooling or communicating-system protocols.

Highlights

  • Low-voltage operation from 20 to 30V AC
  • Mercury-free design for safer installation
  • Heat, cool and heat-pump compatibility without auxiliary heat
  • Millivolt and 750mV system support included
  • Vertical mount fits standard 4 1/2 in height

Specifications

BrandWhite Rodgers
TypeThermostat Accessories
ColorWhite

Questions about this item

Will the 1E56N-444 work with my existing 20 to 30V AC transformer and 750mV millivolt system?

Yes, this thermostat supports dual transformer compatibility and is rated for 20 to 30V AC operation as well as 750mV millivolt systems, making it suitable for both configurations.

How can I verify the 1E56N-444 is controlling my heating and cooling correctly after wiring?

Set the system switch to Heat and raise the control above room temperature; the heating should activate. Switch to Cool and lower the setting; the cooling should start. The fan switch in Auto runs the fan only during a call, while On runs it continuously.

What comes with the 1E56N-444 and what must I supply separately?

The thermostat unit includes the base and cover with terminal designations A, B, G, O, RC, RH, W, Y. You must supply low-voltage wiring, mounting screws, and a compatible 20 to 30V AC transformer if your system does not already provide one.

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