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Ranco A30-X450 defrost control box with 18 in capillary coil

Ranco

Ranco A30-X450 Defrost Cycle Control

SKU CH-ZHGJ-Z0VA1

Controls defrost cycles in room air conditioners with an 18 in air coil, altitude adjustment and a constant 5 °F differential

  • Adjustable altitude compensation ensures accurate operation
  • 18-inch air-coil capillary provides flexible installation
  • Constant 5°F differential maintains stable defrost cycles
  • SPST contact rated 30 A at 120/240 V AC handles heavy loads
  • Locked-rotor rating of 80 A withstands compressor start-up surges

Defrost Cycle Control for Air Conditioners

The Ranco A30-X450 is a defrost cycle control designed for room air conditioners. It uses an 18 inch air coil capillary to sense temperature. The control operates with a constant differential of 5 degrees Fahrenheit and features an adjustable altitude setting. It is built for industrial plumbing and HVAC applications.

Electrical Ratings and Switching Performance

The unit carries a full load current of 30 A at both 120 V AC and 240 V AC. Locked rotor current is rated at 80 A for both voltages. A SPST contact form opens on temperature rise with a cold off setting of 58 degrees Fahrenheit. These ratings support direct control of compressor loads in normal operation.

Replaces Mechanical Defrost Timers

This control replaces fixed-time mechanical defrost timers that cannot adapt to changing conditions. The altitude adjustment and constant differential improve frost management across varying installations. The jump is worth it when existing timers cause excessive defrost cycles or insufficient coil clearing. It is not for systems requiring a cold on temperature setting or multi-stage contact logic.

Highlights

  • Adjustable altitude compensation ensures accurate operation
  • 18-inch air-coil capillary provides flexible installation
  • Constant 5°F differential maintains stable defrost cycles
  • SPST contact rated 30 A at 120/240 V AC handles heavy loads
  • Locked-rotor rating of 80 A withstands compressor start-up surges

Specifications

BrandRANCO

Questions about this item

How do I install the Ranco A30-X450 defrost control and what step is often missed?

Mount the control, wire the SPST contacts in series with the defrost heater circuit, and set the altitude adjustment for the installation elevation — skipping the altitude setting is the step most often missed.

What maintenance or replacement will the Ranco A30-X450 need over time?

The capillary tube and air coil sensor can drift or fracture after years of cycling; plan to verify calibration annually and replace the control if the 5 °F differential can no longer be held.

What is the first limit reached on the Ranco A30-X450 during sustained heavy defrost loads?

The 30 A full-load rating at 120 V or 240 V AC is the continuous limit; the 80 A locked-rotor rating only applies to momentary compressor starts.

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