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Ranco A12-701 defrost control box with 84 in capillary bulb

Ranco

Ranco A12-701 Defrost Cycle Control SPST NC hvac control

SKU CH-9J6S-T284R

SPST NC defrost cycle control provides constant 41 °F cut-in with 15 °F cold-off and 84 in capillary for off-cycle evaporator defrost

  • Constant 41 °F cut-in prevents short cycling
  • SPST NC contacts stay open until evaporator clears frost
  • 84 in capillary with bulb fits varied installations
  • 15 °F cold off protects against freeze-up
  • Off-cycle defrost reduces energy use during idle periods

Defrost Cycle Control for HVAC Systems

The Ranco A12-701 is a defrost cycle control designed for HVAC applications requiring off-cycle defrost management. It suits technicians and installers working on refrigeration equipment where frost accumulation must be cleared automatically during the off cycle.

SPST NC Contact Form with Constant Cut-In

The single specification that decides fit is the SPST normally closed contact form combined with a constant 41 degree F cut-in feature. This control opens contacts each time the system cycles off and keeps them open until the evaporator is cleared of frost from the previous on cycle.

Capillary Bulb Sensing with Fixed Cold Off Point

Thermally the control uses an 84 inch capillary with bulb for temperature sensing and a fixed cold off temperature of 15 degrees F. The constant cut-in operation manages power draw by cycling the compressor off at the set point and delaying restart until frost is removed, reducing unnecessary run time.

Highlights

  • Constant 41 °F cut-in prevents short cycling
  • SPST NC contacts stay open until evaporator clears frost
  • 84 in capillary with bulb fits varied installations
  • 15 °F cold off protects against freeze-up
  • Off-cycle defrost reduces energy use during idle periods

Specifications

BrandRANCO

Questions about this item

What does the constant 41 °F cut-in temperature mean for my refrigeration system?

The control turns the compressor back on whenever the evaporator reaches 41 °F, giving a predictable off-cycle defrost interval.

How does the SPST normally-closed contact arrangement limit the wiring options?

The single-pole single-throw normally-closed contacts open only on a defrost cycle, so the compressor circuit is broken until the evaporator clears.

What clearance is needed to route the 84-inch capillary tube and bulb?

The 84-inch capillary with bulb requires enough free length to reach the evaporator coil without sharp bends or kinks.

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