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A402 HVAC Air Pressure Switch Water Heater Parts 0.5 Psi

The A402 HVAC air pressure switch has a wide application in the water heater, wall-hanging stove, commercial air conditioning filtration system, VAV systems, and so on. Which are high quality and high precision.

HVAC Air Pressure Switch

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HVAC Air Pressure Switch Description

The A402 HVAC air pressure switch belongs to our A4 series family which is high-quality and high precision. It uses the unibody construction design to replace the traditional microswitch construction type, which has better precision, longer life, and is more stable. The accuracy for the A4 HVAC air pressure switch series is ±3Pa, which is a high level on the market.

Meanwhile, it not only has a wide working pressure range that is from 40 to 500Pa, so it can meet many different devices’ requirements. As well as it has good performance in working temperature, which is from -40 to 110℃. So, the switch will not easy to be affected by the environmental temperature.

Besides, it also has a long operating life, it has 250000 cycles of electrical life and 1000000 cycles of mechanical life at least. What’s more, we not only have the air pressure switch but also have the air pressure sensors, which can detect different places’ valves at the same time.  For more REGAL pressure & flow switch sensor products, please click the link or contact us to get more details.


A402 HVAC Air Pressure Switch Size

A4 Air pressure switch size

A402 HVAC Air Pressure Switch Specification

Model Number A402 Air Pressure Sensing Switch
Working Medium Air or Tail gas
Terminal Types Standard 187 Quick Connect (4.8*0.5mm)
Tube Interface 6.3 outer diameter which is suitable for the 5mm inner diameter tube
Circuit SPST NO
Rating 1A  24VDC & 0.5A 125/250VAC
Withstand Voltage 3000Pa(0.5Psi)
Electrical Life 25000000 cycles
Gas recovery outlet Negative
Working Temperature -40 to +110℃


Pressure Range Set Point
Set tolerance
Differential Range
ON=40 to 100 ±5 Pa(ON) & 8Pa(OFF) 15-30Pa
ON=100 to 200 ±8 Pa(ON) & 12Pa(OFF) 20-40Pa
ON=200 to 500 ±10 Pa(ON) & 15Pa(OFF) 10% – 20%
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