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Supco SFC300400 Fan Cycle Switch 300 PSI Open/400 PSI Close

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Special Price $23.13 Regular Price $30.07
In stock
SKU
SFC300400
The Supco SFC300400 Fan Cycle Pressure Switch is a pressure-operated control that assists in controlling the use of fans in refrigeration and cooling systems. It slightly opens at around 300 PSI and closes at around 400 PSI with the system pressure variation during use in air conditioners, heat pumps and other packaged HVAC systems. The switch is installed in the right pressure line and connected to the control circuit as required. This part enables efficient heat rejection, assists in maintaining the operating conditions and leads to the stable and reliable performance of the system after cycling the fan depending on the pressure levels.
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HVAC Controls & Electrical, Switches, Control Switches
Manufacturer:
https://www.partshnc.com/media/catalog/product/0/0/0010943_0.jpg
Manufacturer Name: Supco
Product Number: SFC300400
OEM Part Number: SFC300400
Product Description: 300#Co 400#Ci Fan Cycle Switch
Weight:0.15lbs/68.04g

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Product Questions (2)
Customer Questions
What maintenance is required for the Supco SFC300400 Fan Cycle Switch?

Regularly inspect the switch for secure mounting and check refrigerant line connections for leaks or corrosion. Ensure electrical terminals are tight and free of oxidation. Verify proper pressure operation during service to maintain accurate cycling and prevent compressor or fan control issues.

What are common issues with the Supco SFC300400 Fan Cycle Switch?

  • Inaccurate pressure switching due to calibration drift.
  • Electrical contact wear causing intermittent operation.
  • Refrigerant leaks affecting pressure sensing accuracy.
  • Sticking contacts leading to continuous fan operation.
  • Failure to open or close at specified pressure points.

Installation Steps

Step 1: Disconnect power and relieve system pressure before starting.

Step 2: Remove existing switch and note all wiring positions for reference.

Step 3: Mount new switch on the designated port and tighten securely.

Step 4: Reconnect electrical leads to matching terminals as originally configured.

Step 5: Check cut-in and cut-out settings for accuracy.

Step 6: Restore power, observe fan cycling response, and check stable operation under load.