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Gray rectangular HVAC thermostat with temperature dial and mounting holes

SIEMENS

SIEMENS 134-1511 Line Volt Mechanical Tstat Open/Close on Rise 120/208/240V hvac control

SKU CH-HPDM-2NJTY

Mechanical line-voltage thermostat switches heating or cooling loads on temperature rise with a 35 to 45 °F range and 12 °F differential

  • ColorGray
  • Line voltage operation at 120/208/240VAC for flexible installation
  • SPDT switch with open-on-rise action protects equipment
  • 16A at 120VAC and 8A at 240VAC handles heavy heating loads
  • Adjustable 35–45°F range with 12°F differential suits low-temp control
  • Remote sensing bulb included enables accurate temperature measurement

SIEMENS 134-1511 Line Voltage Thermostat

The SIEMENS 134-1511 is a mechanical line voltage thermostat designed for HVAC heating and cooling control. It operates on 120, 208 or 240 VAC systems and suits installers needing a non-programmable switch with remote sensing capability.

Mechanical Build and Remote Sensing

The gray enclosure houses a single SPDT switch rated at 16 amps at 120 VAC and 8 amps at 240 VAC. A remote sensing bulb is included, allowing temperature measurement away from the main unit. Mounting dimensions are 3-9/32 inches high, 5 inches wide and 2-1/2 inches deep.

Temperature Range and Switch Action

The control range spans 35 to 45 degrees F with a 12 degree differential and sensitivity from 15 to 55. Switch action opens or closes on temperature rise, providing direct load control without external power. No fan or active cooling is involved, so operation is silent.

Highlights

  • Line voltage operation at 120/208/240VAC for flexible installation
  • SPDT switch with open-on-rise action protects equipment
  • 16A at 120VAC and 8A at 240VAC handles heavy heating loads
  • Adjustable 35–45°F range with 12°F differential suits low-temp control
  • Remote sensing bulb included enables accurate temperature measurement

Specifications

BrandSIEMENS
ColorGray

Questions about this item

What does the 12-degree differential mean for the 134-1511 thermostat?

The contacts open when temperature rises to the setpoint and stay open until the temperature falls 12 degrees F below that point, then close again.

What are the exact mounting dimensions of the 134-1511 unit?

The case measures 3-9/32 inches high, 5 inches wide and 2-1/2 inches deep, so allow that footprint plus wiring space.

How is the remote sensing bulb on the 134-1511 installed?

Mount the bulb in the air stream or duct you want to control; a common mistake is placing it near a heat source or in direct sunlight, which shifts the 35 to 45 degree F range.

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