Raypak FG1-18P Frost Guard Temperature Switch

Product Description

The RAYPAK FG1-18P is a frost guard temperature switch designed to protect heating and pool heating equipment from freeze damage. When ambient or water temperatures drop to a critical threshold, the device signals the system to activate, preventing frozen pipes, heat exchangers, and related components. Licensed HVAC technicians, pool service professionals, and plumbers install this type of control as part of a broader freeze-protection strategy on outdoor or exposed equipment. The FG1-18P provides a reliable, automatic response to cold-weather conditions without requiring manual intervention from the operator.

The FG1-18P is suited for use on pool heaters, spa heaters, and hydronic heating systems where freeze protection is a code or manufacturer requirement. It is commonly installed on equipment located in regions subject to near-freezing or below-freezing ambient temperatures. Outdoor pool and spa heater installations are the most typical application, where water left sitting in heat exchangers or plumbing can freeze and cause catastrophic damage if no protective control is in place.

Key Features

• Automatic freeze-protection response triggers system operation at low temperature thresholds
• Designed for outdoor pool, spa, and hydronic heating equipment
• Protects heat exchangers and plumbing from freeze damage
• Direct-replacement form factor for RAYPAK-equipped systems

Compatibility

Designed as an OEM-style replacement frost guard control for RAYPAK pool and spa heating equipment. Consult the equipment service manual to confirm fitment before installation.

Installation Notes

Installation should be performed by a licensed HVAC technician or pool service professional familiar with low-voltage control wiring and manufacturer freeze-protection wiring diagrams. Shut off all power to the heater unit at the disconnect before removing or installing any control component. Follow all applicable local mechanical and electrical codes, including NEC requirements for low-voltage control circuits. Do not bypass or jumper the frost guard circuit during testing without following the manufacturer service procedure.

Technical Specifications

• UPC: 71562900812

Standard Information

• Brand: RAYPAK
• Manufacturer Part Number: FG1-18P