Johnson Controls P170SA-1 Dual Pressure Control, Two SPDT Switches

The Johnson Controls P170SA-1 is a professional-grade dual pressure control engineered for reliable refrigeration and HVAC system protection. Featuring two fully independent SPDT (Single-Pole, Double-Throw) switch actions in a single compact housing, this control monitors both the low- and high-pressure sides of a refrigerant circuit simultaneously — eliminating the need for two separate controls and simplifying installation.

Low Pressure Side

• Pressure range: 12″ Hg (vacuum) to 80 PSI
• Adjustable differential: 5 to 35 PSI
• Automatic reset operation for low-side pressure faults

High Pressure Side

• Pressure range: 100 to 500 PSI
• Fixed differential: 65 PSI
• Lockout function requires manual reset — provides positive fault indication and prevents automatic restart after a high-pressure trip

Connection & Construction

• 1/4″ external flare connection for easy field installation
• Two independent SPDT switch actions allow flexible wiring configurations
• Rugged construction suitable for commercial refrigeration and air conditioning applications

Key Benefits

• Dual-function design monitors both high and low refrigerant pressures in one device
• Manual reset on high-pressure lockout prevents nuisance restarts and protects compressor equipment
• Wide low-side range including vacuum detection suits a broad range of refrigerants and system types
• SPDT switch action on each side provides versatile control circuit integration
• Trusted Johnson Controls quality for long-term reliability in demanding HVAC/R environments