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Honeywell LP916A1134 2-Pipe Return Air Thermostat Direct Acting 0.005"

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Special Price $667.79 Regular Price $741.24
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LP916A1134

The Honeywell LP916A1134 Return Air Stat is the centerpiece of the comfort symphony in 2-pipe HVAC systems. With its graceful placement in the return air duct, this pneumatic thermostat creates a quiet tango with temperature changes. Its genius is in its direct action: the stat smoothly opens or closes a valve to regulate the airflow from your furnace or heat pump when temperatures deviate from your preferred setting. This careful regulation drives away uncomfortable fluctuations in temperature and guarantees constant comfort. Designed to work with a variety of 2-pipe HVAC equipment, the LP916A1134 integrates easily with current setups. Adjustments become a harmonic experience with its simple operation, clear warmer/cooler indicators, and wide 65-85 degree setpoint range. Additionally, the 005 differential pressure adjustment ensures peak performance by precisely adjusting airflow for maximum efficiency.

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HVAC Ventilation Parts, Furnace Gas Valve
Manufacturer:
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Product Overview:
Maintaining proper air mixing and discharge temperatures in unit ventilators is critical for commercial HVAC and institutional climate control. The Honeywell LP916A1134 is an OEM 2-pipe return air pneumatic controller/transmitter engineered to modulate branch line pressure based on sensed return air conditions across a 65°F to 85°F setpoint range.

Controller Operation:
This direct-acting (DA) bleed-type pneumatic device uses a 3/8" x 7" liquid-filled bulb attached to a 36" capillary tube to sense return air temperatures inside unit ventilators. Rather than utilizing an internal restriction orifice, it operates in tandem with an external 0.005" inline main air restrictor. As room conditions warm, the direct-acting bleed mechanism adjusts air exhaust to increase output branch line pressure across its 3.5°F throttling range, modulating pneumatic valves or dampers to maintain space comfort.

Replacement Guidelines:
Replace Honeywell LP916A1134 when the existing unit exhibits internal air leaks, clogged bleed ports, or unresponsiveness to temperature shifts due to capillary damage. Shut off main supply air pressure before servicing, and avoid kinking or damaging the 36" capillary tube during coil routing. Confirm 2-pipe pneumatic connections, direct-acting logic, external 0.005" restrictor usage, and 65°F–85°F setpoint calibration prior to installation.

Common Failure Symptoms:

  • Connected pneumatic damper actuators or heating/cooling valves fail to reposition during temperature changes.
  • Loss of pneumatic charge or physical kinking in the 36" capillary element leads to a locked output signal.
  • The external 0.005" inline restrictor becomes clogged with oil or particulate contaminants, restricting branch pressure modulation.
  • Warmer/Cooler adjustment dial slips or fails to alter branch line output pressure.

Equipment Compatibility:
The Honeywell LP916A1134 is compatible with commercial unit ventilators and 2-pipe pneumatic HVAC control loops requiring direct-acting (DA) return air sensing. Always cross-reference part number LP916A1134, 3/8" x 7" bulb dimensions, 36" capillary length, and 2-pipe configuration against original manufacturer documentation prior to replacement.

Technical Specifications:
Brand: Honeywell
Part number: LP916A1134
Product Type: Unit Ventilator Pneumatic Controller / Transmitter
Control Style: Bleed-Type (Requires External Restrictor)
Pipe Configuration: 2-Pipe
Action Type: Direct Acting (DA)
External Restrictor Requirement: 0.005" Inline Restrictor
Air Consumption: 0.011 scfm (5.2 mL/s) at nominal supply
Setpoint Temperature Range: 65°F to 85°F
Throttling Range: 3.5°F
Scale Markings: Warmer / Cooler
Sensing Element: 3/8" x 7" Bulb with 36" Capillary
Application: Unit Ventilator Return Air Pneumatic Control

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Product Questions (4)
Customer Questions
What function does the Honeywell LP916A1134 pneumatic controller perform?

The Honeywell LP916A1134 senses return air temperature via its remote capillary bulb and modulates branch line air pressure via a bleed mechanism to control unit ventilator dampers or valves.

Does the Honeywell LP916A1134 have an internal restriction orifice?

No. The LP916A1134 is a bleed-type device that relies on an external 0.005" inline restrictor placed in the main supply line to operate properly.

What is the air consumption rating for this device?

When paired with the required 0.005" external restrictor, the unit consumes approximately 0.011 scfm (5.2 mL/s) of compressed air during normal operation.

How do I confirm if part number LP916A1134 matches my unit ventilator system?

Check your original equipment parts diagram to verify that your system utilizes a 2-pipe direct-acting (DA) bleed controller with a 3/8" x 7" bulb on a 36" capillary requiring an external 0.005" restrictor.