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Weil McLain 640-000-019 Water Pressure Switch W/Mount Combi

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Special Price $67.57 Regular Price $77.70
In stock
SKU
640-000-019
The Weil McLain 640-000-019 Water Pressure Switch W/Mount Combi is a pressure-sensing part, which detects and measures in a hydronic heating circuit and sends an electrical signal when set thresholds are met in HVAC systems. It is directly sewn on piping or system structure and linked to control circuitry to use it to operate and to be safe, depending on pressure. This switch is installed in water loops where a regular pressure is needed to ensure the regulation and protection of the HVAC systems.
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HVAC Controls & Electrical, Switches, Pressure Switches
Manufacturer:
https://www.partshnc.com/media/catalog/product/6/4/640-000-019_weil-mclain_partshnc.jpg
Manufacturer Name: Weil McLain
Product Number: 640-000-019
OEM Part Number: 640-000-019
Product Description: Kit-S Swchwtr Press Wmnt Combi
Weight:0.08lbs/36.29g

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Product Questions (2)
Customer Questions
What maintenance is required for the Weil McLain 640-000-019 Water Pressure Switch?

Regularly inspect the pressure switch and mounting assembly for moisture, corrosion, or loose wiring connections. Ensure the sensing port and tubing remain clear and properly attached. Proper maintenance helps maintain accurate pressure detection and safe operation. Always disconnect power before inspecting or servicing the switch.

What are common issues with the Weil McLain 640-000-019 Water Pressure Switch?

  • Switch failing to detect water pressure accurately.
  • Electrical contacts failing or sticking.
  • Internal mechanical failure within the switch.
  • Improper mounting causing inconsistent operation.

Installation Steps

Step1: Turn off power and water supply for safety.

Step2: Release pressure and drain water if needed to access the switch location.

Step3: Disconnect the old pressure switch wiring and remove mounting hardware.

Step4: Install the new switch with its mount, ensuring correct orientation.

Step5: Reconnect wiring securely per manufacturer specifications.

Step6: Restore water and power, then test for proper pressure response and no leaks.