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Xylem-McDonnell & Miller 69 LWCO 4 1/8" Insertion 20# #153900

Special Price $496.25 Regular Price $550.84
In stock
SKU
69

The Xylem-McDonnell & Miller 69 Low Water Cut-Off is an essential component that improves HVAC system safety and efficiency. This device serves as a safety measure against possible boiler damage brought on by low water levels, with an insertion depth of 4 1/8 inches. It uses the conductivity principle to detect the presence of water and initiates a shutdown sequence if the levels drop below acceptable bounds. The 69 Low Water Cut-Off is compatible with a range of HVAC equipment, including steam boilers, hot water boilers, and hydronic systems. It provides dependable protection against dry fire and overheating, extending the life of the equipment and lowering maintenance expenses. It is a sensible option for both new installations due to its small size and simple installation.

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Manufacturer Name: Xylem-McDonnell & Miller
Product Number: 69
OEM Part Number: 69
Product Description: Lwco,4 1/8"Inser,20#,#153900
Weight:3.91lbs/1773.54g

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Customer Questions
What maintenance is required for the Xylem-McDonnell & Miller 69 Low Water Cut-Off?

Inspect the low water cut-off regularly for scale buildup, sediment, or sludge that can interfere with float or probe movement. Clean internal components and test the cut-off function to ensure it properly shuts down the system at low water levels. Check electrical connections and wiring for corrosion or looseness. Routine maintenance ensures safe operation and prevents dry-fire damage.

What are common issues with the Xylem-McDonnell & Miller 69 Low Water Cut-Off?

  • Scale or sludge buildup causing false readings or sticking.
  • Float mechanism failure preventing proper shutdown.
  • Electrical contact wear leading to intermittent operation.
  • Slow response due to dirty or restricted sensing chamber.
  • False trips caused by water level turbulence or contamination.

Installation Steps

Step 1: Turn off unit power and allow system to cool completely.

Step 2: Close water supply and drain to safe level.

Step 3: Mount component on unit tapping at correct water line position.

Step 4: Connect wiring to burner control circuit per diagram.

Step 5: Reopen water supply and check for leaks.

Step 6: Restore power and test cut-off by lowering water level.