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Ranco O16-108 HVAC pressure control switch, compact metal housing with flare fitting and electrical terminals

Ranco

Ranco O16-108 Single Pressure Control SPDT HVAC control

SKU CH-2H7F-VZZJK

Single-pressure HVAC control switches at 100–400 psi with SPDT contacts rated for 24–600 V AC

  • Controls pressure from 100 to 400 psi for versatile HVAC use
  • SPDT contact form enables both open-on-rise and open-on-fall switching
  • Automatic reset restores operation without manual intervention after pressure normalises
  • Rated for 120V, 240V, 24V and 277-600V AC across diverse installations
  • NEMA 1 enclosure protects internal components in standard indoor environments

Single Pressure Control for HVAC Systems

The Ranco O16-108 is a single pressure control designed for HVAC applications requiring automatic pressure regulation. It suits technicians and installers managing refrigeration or air conditioning equipment where a single switch point is sufficient. This control is not for systems needing dual pressure monitoring or electronic programmable logic. Builders requiring independent high and low cut-outs should select a different device.

Pressure Range 100 to 400 psi with SPDT Switch

The control operates across a pressure range of 100 psi minimum to 400 psi maximum with an adjustable differential between 4 psi and 150 psi. It features an SPDT contact form rated for 120V AC, 240V AC, 24V AC, and 277-600V AC circuits. The switch action can be set to open on pressure fall or open on pressure rise. A 1/4 inch female flare connection attaches the pressure sensing element.

Straightforward Flare Connection and Automatic Reset

Installation uses a standard 1/4 inch female flare fitting compatible with common refrigerant hoses. The NEMA 1 rated enclosure is intended for indoor mounting away from moisture. Automatic reset restores operation once pressure returns within the set differential. Miswiring the SPDT terminals or setting the differential too narrow for system pressure swings are common issues that cause short cycling.

Highlights

  • Controls pressure from 100 to 400 psi for versatile HVAC use
  • SPDT contact form enables both open-on-rise and open-on-fall switching
  • Automatic reset restores operation without manual intervention after pressure normalises
  • Rated for 120V, 240V, 24V and 277-600V AC across diverse installations
  • NEMA 1 enclosure protects internal components in standard indoor environments

Specifications

BrandRANCO

Questions about this item

What does the 400 psi maximum pressure mean for my HVAC system?

The control will open or close its contacts when system pressure reaches up to 400 psi, protecting compressors from over-pressure conditions.

How does the SPDT contact form work with the 120V AC and 240V AC ratings?

The single-pole double-throw switch can control two separate circuits at 120V AC or 240V AC, opening on pressure rise or fall as configured.

What does the 1/4 inch flare connection require for installation?

A 1/4 inch female flare fitting on your refrigerant line connects directly to the control's pressure port without adapters.

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