Ranco O10-1491 Temperature Control

The Ranco O10-1491 is a commercial-grade high temperature control engineered for precision regulation in refrigeration and HVAC systems. Built with a heavy-duty plated steel frame and a NEMA 1 enclosure, this O-series control is designed for field-proven reliability. It features a technical set point range of 25°F to 75°F with a fixed 2°F differential, ensuring stable cycling and equipment protection. The 72-inch capillary tube with a 3/8" x 6" remote sensing bulb allows for flexible mounting and accurate temperature detection even in remote or high-vibration environments. For streamlined wiring, the unit includes raised screw terminals and a front-located captive cover screw, making it a preferred choice for technicians working on self-contained coolers, walk-in units, and display cases. The laser-welded bellows provide an extended service life by maintaining calibration consistency under standard operating pressures.

• Universal Compatibility: Replaces specific Johnsons Controls A19 and Penn series models, fitting a wide array of commercial refrigeration applications.
• Flexible Installation: A 72-inch remote bulb capillary allows the sensing element to be positioned away from the localized heat of the control body.
• Rugged Construction: Features a high-quality non-conductive cover and a plated steel frame for durability in harsh mechanical rooms.
• Installation Versatility: Can be mounted in any orientation (except upside down) using the included bracket or via flush-mount screw holes.
• Enhanced Protection: The SUPER CAP capillary system and laser-welded bellows minimize the risk of refrigerant leaks and calibration shift.

Is the differential on the O10-1491 adjustable?
No, this specific model features a 2°F fixed differential, which is optimal for maintaining tight temperature windows without frequent field recalibration.

What is the switch action for this temperature control?
The Ranco O10-1491 uses an SPST switch that is designed to open on rise (cut-out at the high set point) to protect against overheating.

Can the capillary be cut or modified?
Do not cut or deform the 72" capillary or the remote bulb. Any modification to the sensing element will cause the pressure charge to escape, rendering the control inoperable.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.