Parker
Parker LAC4-180 Head Pressure Control 1/2 In 180 PSIG 450 PSIG design
Automatic head-pressure control for low-ambient refrigeration and air-conditioning systems, 1/2 in ODF connections, brass body with copper fittings, 180 PSIG set point, 450 PSIG design pressure.
- Automatic head-pressure regulation for low-ambient operation
- 180 PSIG factory set point ensures stable condensing pressure
- 450 PSIG design pressure handles high-side stress
- Brass body with copper ODF fittings resists corrosion
- UL SA-5460 listed for refrigeration and A/C systems
Head Pressure Control for Low Ambient Operation
The Parker LAC4-180 is an automatic head pressure control valve designed for refrigeration and air conditioning systems. It maintains stable condensing pressure when outdoor temperatures drop, allowing equipment to operate reliably in cold conditions. The valve features a brass body with copper ODF fittings and a 1/2 inch connection size for direct piping integration.
Sustained Regulation at 180 PSIG Set Point
Under continuous low-ambient load the valve modulates to hold the factory set point of 180 PSIG, preventing excessive head pressure drop that can starve evaporators or cause erratic TXV operation. The automatic response adjusts to changing condenser load without manual intervention, keeping system capacity steady during extended winter running or night-time cooling cycles.
Brass Body Rated for 450 PSIG Design Pressure
The brass construction with copper fittings withstands a design pressure of 450 PSIG, providing a wide margin above the control set point for safe operation during pump-down or high-load transients. UL listing SA-5460 confirms compliance with recognised safety standards for refrigeration components. The valve adds minimal flow restriction and requires no external power, so it introduces no electrical noise or additional energy draw.
Highlights
- Automatic head-pressure regulation for low-ambient operation
- 180 PSIG factory set point ensures stable condensing pressure
- 450 PSIG design pressure handles high-side stress
- Brass body with copper ODF fittings resists corrosion
- UL SA-5460 listed for refrigeration and A/C systems
Specifications
| Brand | PARKER |
|---|
Questions about this item
How much power does the Parker LAC4-180 draw while regulating head pressure all day?
The control is a mechanical valve that operates from system refrigerant pressure, so it consumes no electrical power during continuous operation.
What piping and refrigerant must already be on site for the 1/2-inch ODF connections to work?
The valve has 1/2-inch ODF copper fittings and a brass body rated for 450 PSIG design pressure, ready for standard refrigeration and air-conditioning systems.
Will the fixed 180 PSIG set point work with an older condenser that was sized for a different pressure?
The control opens at 180 PSIG and is UL listed under SA-5460, so it will modulate fan or condenser pressure at that single setting regardless of the condenser’s original design.
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