Dual Low / High Pressure Switches (All Pressure Ranges)

The Dual Low / High Pressure Switches (All Pressure Ranges) combine low-pressure suction monitoring and high-pressure discharge protection within a single, heavy-duty control housing. Available across all standard commercial and industrial pressure range configurations, this dual-function control switch automatically cuts electrical power to the compressor or triggers system alarms when pressures deviate from safe operating setpoints. Built with durable metal alloy pressure connections, responsive internal bellows, and high-precision SPDT microswitches, it prevents severe mechanical failure caused by refrigerant leaks, evaporator frosting, or condenser airflow blockage in air conditioners, chillers, and commercial cold storage units.

Technical Specifications

Key Features

• Dual Protection in One Unit: Combines suction line low-pressure cutout and discharge line high-pressure safety into one compact housing to reduce control panel space.

• Available Across All Pressure Ranges: Offered in multiple adjustable range choices to match low-temperature freezers, medium-temperature coolers, and high-pressure R410A/R32 air conditioning systems.

• Snap-Action SPDT Microswitch: Delivers rapid, positive contact breaking to eliminate electrical arcing and chattering under heavy electrical loads.

• Corrosion-Resistant Construction: Built with heavy-duty metal alloy flare ports and protected bellows for continuous operation in severe environments.

• Calibrated Adjustment Scales: Clear front scales enable quick, precise on-site adjustment of cut-in setpoints and differential pressure margins.

Supported Applications

• HVAC & Comfort Cooling: Split air conditioners, VRF outdoor units, packaged rooftop systems, and heat pumps.

• Commercial & Industrial Refrigeration: Cold rooms, walk-in freezers, blast chillers, and supermarket display cases.

• Compressor Safety & Automation: Direct compressor safety cut-out, pump-down system automation, and condenser fan cycling.

Benefits

• Eliminates the need for two separate switches, simplifying wiring complexity and installation time.

• Safeguards expensive compressors from running dry during loss of refrigerant charge or high-side blockage.

• Broad range availability ensures exact compatibility with all major commercial refrigerants and operating pressures.

Package Includes

• 1 x Dual Low / High Pressure Control Switch (Selected Pressure Range & Reset Model)

• 1 x Heavy-Duty Mounting Bracket & Hardware Kit

Important Buyer Verification Notes

Notice for Technicians & Contractors: Confirm the required pressure range (bar/psig) and reset mechanism (Automatic vs. Manual) for your specific compressor model before installation. Always leak-test the 1/4″ pressure flare ports and isolate power before making scale setting adjustments.

Why Buy From Al Ramiz

• Genuine Quality Parts: Field-tested safety switches, controls, and refrigeration accessories.

• UAE Stock & Local Inventory: Fast order processing and rapid dispatch across the UAE.

• Technical Support: Expert guidance with setting differentials, wiring schematics, and range selection.

Frequently Asked Questions (FAQs)

Are these pressure switches available in different pressure ranges?

Yes, we supply these dual pressure switches across all standard HVAC/R pressure ranges to support low-pressure suction lines and high-pressure discharge systems for R22, R134a, R404A, and R410A.

What is the difference between manual reset and automatic reset versions?

An automatic reset switch restores power automatically once pressure returns to normal operating limits. A manual reset switch trips and locks out, requiring a technician to manually press the reset button after inspecting the cause of the fault.

Can this dual pressure switch handle both low and high pressure at the same time?

Yes, it features two independent bellows mechanisms connected to a single microswitch mechanism, allowing it to monitor both suction and discharge pressures simultaneously.