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White rectangular thermostat, hardwired 24V AC, horizontal mount

Dayton

Dayton 4PU51 Low Voltage Thermostat 24V AC

SKU CH-GBN0-NZE8J MPN 4PU51

Hardwired 24V AC thermostat controls heat-only systems from 50 to 90 degrees Fahrenheit

  • TypeLearning Thermostats
  • ColorWhite
  • Mercury-free design for safer heating control
  • Hardwired 24 V AC power for reliable operation
  • Controls heat-only systems from 50 to 90 °F
  • Compatible with 250–750 mV and 30 V AC gas or oil units
  • Compact white housing mounts horizontally at 3 1/4 in height

White Low Voltage Thermostat

The Dayton 4PU51 is a hardwired 24V AC thermostat designed for heat-only systems using gas or oil. It fits millivolt applications from 250 to 750 mV as well as 30V AC circuits. The white unit mounts horizontally and contains no mercury.

Installers wiring millivolt or 30V heat-only systems

This thermostat suits contractors and facility managers who need a basic 24V AC control with R and W terminals for single-stage heating. It does not serve systems that require fan switching, automatic changeover, dual-transformer compatibility or cooling control.

50 to 90 degree Fahrenheit control range

The adjustable setpoint spans 50 to 90 degrees Fahrenheit, covering typical residential and light-commercial heating requirements. Verify that the application stays within this range before specifying the 4PU51.

Highlights

  • Mercury-free design for safer heating control
  • Hardwired 24 V AC power for reliable operation
  • Controls heat-only systems from 50 to 90 °F
  • Compatible with 250–750 mV and 30 V AC gas or oil units
  • Compact white housing mounts horizontally at 3 1/4 in height

Specifications

BrandDayton
Model4PU51
TypeLearning Thermostats
ColorWhite

Questions about this item

Do I need a 24 V AC transformer already installed for the 4PU51 to work?

Yes, the thermostat is hardwired and requires a 24 V AC supply from your existing heating system transformer.

Will the 4PU51 control a millivolt gas valve on my older furnace?

The unit is compatible with 250–750 millivolt and 30 V AC heat-only systems, so it can replace many older millivolt gas or oil controls.

How can I verify the 4PU51 is regulating temperature correctly after wiring it?

Set the dial within the 50–90 °F range and confirm the heating system cycles on and off at the chosen set-point.

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