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Gray Emerson 152-9 mechanical line-voltage thermostat, square wall-mount housing

Emerson Climate Technologies

Emerson 152-9 Line Volt Mechanical Tstat Open on Rise hvac control

SKU CH-HNZE-E0878

Line-voltage mechanical thermostat switches heating loads from 55 to 85 °F with SPST open-on-rise action at 120 to 240 V AC

  • ColorGray
  • Controls heating from 55 to 85 °F for comfort
  • Handles 14 A at 120 V AC for strong loads
  • Open-on-rise switch action protects against overheating
  • Mechanical SPST design needs no programming or batteries
  • Compact 4½-inch square fits standard wall boxes

Emerson 152-9 Line Volt Thermostat

The Emerson 152-9 is a line-voltage mechanical thermostat designed for heating applications. It uses a single-pole single-throw switch that opens on temperature rise. The unit mounts directly to a box or flush to a wall and operates on 120 to 240V AC circuits. It suits residential or light commercial heating control where programmable features are not required.

Sustained Load Behaviour

Under continuous operation the contacts are rated for 14 full-load amps at 120V AC and 7 full-load amps at 240V AC. The mechanical differential is fixed at 2 degrees Fahrenheit, so the switch cycles consistently around the set point without electronic drift. No remote sensing bulb is included, so the device responds only to ambient air at its mounting location.

Pre-Installation Checks

Verify that the supply voltage falls within the 120 to 240V AC range and that the connected heating load does not exceed the stated amp ratings. Confirm the control range of 55 to 85 degrees Fahrenheit matches the desired comfort window. Ensure the mounting surface accommodates the 4 1/2 by 4 1/2 inch footprint and 2 1/4 inch depth for box or flush installation.

Highlights

  • Controls heating from 55 to 85 °F for comfort
  • Handles 14 A at 120 V AC for strong loads
  • Open-on-rise switch action protects against overheating
  • Mechanical SPST design needs no programming or batteries
  • Compact 4½-inch square fits standard wall boxes

Specifications

BrandEMERSON
ColorGray

Questions about this item

How much power does the Emerson 152-9 thermostat draw when it runs continuously on a 120 VAC circuit?

The thermostat itself consumes negligible power; its SPST switch is rated for 14 A full load at 120 VAC, so the circuit must be sized for the connected heating load, not the control.

What wiring and mounting hardware must I already have to install this line-voltage thermostat?

You need a 120–240 VAC supply, a heating load within 14 A at 120 V or 7 A at 240 V, a standard wall box or flush-mount opening, and wire sized for the heater circuit.

Will the Emerson 152-9 work alongside an existing low-voltage 24 V thermostat on the same heating system?

No, this is a line-voltage SPST switch rated 120–240 VAC; it cannot be wired in parallel with a 24 V control and must directly interrupt the heater supply.

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