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Trane SWT2291 SPNO Negative Pressure Switch

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Special Price $62.48 Regular Price $71.85
In stock
SKU
SWT2291
The Trane SWT2291 SPNO Negative Pressure Switch is a unique component used in HVAC systems. At 4" in length, it is a choice for assuring system safety and efficiency. Currently rated at 3A for 12 VAC, the switch is suitable for a variety of residential and commercial applications. It has a quick connect terminal type and is intended for use with 3/16" flexible plastic or rubber tubing. It works with a pressure rating of 0.5 PSI and monitors and responds to negative pressure conditions. This switch is rated from -4°F to 19°F, so it will perform in a temperature range. It has a power rating of 28/125 VA pilot duty at 24/125V AC.
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HVAC Controls & Electrical, Switches, Pressure Switches
Manufacturer:
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Specifications

  • Length: 4"
  • Current Rating: 3A
  • Number of Poles: 1
  • Pressure Rating: 0.5 PSI
  • Terminal Type: Quick Connect (Male)
  • Voltage: 12 VAC
  • For Use With: 3/16" Flexible Plastic or Rubber Tubing
  • Power Rating: 28/125 VA Pilot Duty at 24/125V AC
  • Temperature Rating: -4°F to 19°F
  • Type: Negative
  • Weight: 0.61lb
Manufacturer Name: Trane
Product Number: SWT2291
OEM Part Number: SWT2291
Product Description: Spno Negative Pressure Switch
Weight:0.61lbs/276.69g

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Product Questions (2)
Customer Questions
What maintenance is required for the Trane SWT2291 Pressure Switch?

Inspect tubing and sensing ports regularly for blockages or moisture buildup. Ensure electrical connections are tight and corrosion-free. Clean gently with dry air and verify calibration during routine HVAC servicing. Handle carefully to avoid damaging diaphragm components.

What are common issues with the Trane SWT2291 Pressure Switch?

  • False triggering or intermittent switching.
  • Air leakage in sensing tubing.
  • Stuck or unresponsive diaphragm.
  • Electrical contact failure or open circuit.
  • Inconsistent or inaccurate pressure response.
  • Delayed response to pressure changes.

Installation Steps

Step 1: Turn off power to the HVAC unit for safety.

Step 2: Locate the existing pressure switch and note wiring connections.

Step 3: Disconnect wires and remove the old switch.

Step 4: Mount the new switch securely in the same position.

Step 5: Reconnect wires to matching terminals.

Step 6: Attach tubing firmly to the pressure port.

Step 7: Restore power and test system operation for proper switching.