Description
The Supco SFC170250 is a single-pole, single-throw (SPST) fan cycle switch engineered for precise head pressure control in air conditioning and refrigeration systems. Designed to close on pressure rise, this switch cycles the condenser fan motor on and off based on system refrigerant pressure, helping maintain optimal operating conditions in low-ambient or variable-load environments.
How It Works
The SFC170250 monitors high-side refrigerant pressure and uses a factory-set differential to control condenser fan operation. When system pressure drops to the cut-out setpoint, the switch opens and stops the fan. As pressure rises back to the cut-in setpoint, the switch closes and restarts the fan — protecting compressor performance and system efficiency.
Key Specifications
- Cut-Out (Open) Pressure: 170 PSI
- Cut-In (Close) Pressure: 250 PSI
- Switch Action: Closes on Pressure Rise
- Switch Type: SPST (Single-Pole, Single-Throw)
- Brand: Supco
- SKU / Part Number: SFC170250
Features & Benefits
- Factory-calibrated pressure setpoints for reliable, repeatable switching performance
- SPST design simplifies wiring and integration into existing control circuits
- Closes on pressure rise — ideal for condenser fan cycling applications
- Helps prevent compressor damage caused by low head pressure in cold-ambient conditions
- Durable construction suited for demanding HVAC and refrigeration environments
- Direct replacement or upgrade for compatible fan cycle switch applications
Typical Applications
- Commercial and residential air conditioning condensing units
- Refrigeration systems requiring head pressure control
- Low-ambient condenser fan cycling circuits
- OEM and aftermarket replacement installations
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