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Xylem-Bell & Gossett 1BN321LF PT-42V 20-Gallon Lead-Free Potable Expansion Tank

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Special Price $483.86 Regular Price $537.08
In stock
SKU
1BN321LF
The Xylem-Bell & Gossett 1BN321LF Lead-Free Potable Expansion Tank PT-42V is a pressure-control component used in hot water and hydronic heating in the HVAC system. That is interconnected with system piping and is designed with a 20-gallon capacity lead-free potable tank design to encourage pressurised water systems, which will assist in controlling the pressure variation. The excess water volume created during heating is absorbed, allowing the system to maintain balanced internal pressure. Within the vessel, there is a sealed diaphragm between the air and water to allow the water to fill the tank and squeeze the air cushion.
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Heating & Furnace Parts, Hydronics
Manufacturer:
https://www.partshnc.com/media/catalog/product/1/b/1bn321lf_xylem-bell--gossett_partshnc.png
Manufacturer Name: Xylem-Bell & Gossett
Product Number: 1BN321LF
OEM Part Number: 1BN321LF
Product Description: Pt-42V 20Gal Potabletnk,Leadfr
Weight:32lbs/14514.94g

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Product Questions (2)
Customer Questions
What maintenance is required for the Xylem-Bell & Gossett 1BN321LF Expansion Tank?

Inspect the tank regularly for external corrosion, leaks, or signs of waterlogging. Check air pre-charge pressure periodically to ensure proper system balance and efficient thermal expansion control. Ensure piping connections remain tight and the tank is securely mounted to prevent vibration damage.

What are common issues with the Xylem-Bell & Gossett 1BN321LF Expansion Tank?

  • Loss of air charge leading to waterlogging.
  • Internal bladder failure causing pressure instability.
  • External corrosion or tank shell degradation.
  • Leaks at threaded or connection points.
  • Reduced system pressure control efficiency.

Installation Steps

Step 1: Turn off main water supply and safely relieve system pressure before installation.

Step 2: Select vertical mounting position near cold water inlet, ensure adequate structural support.

Step 3: Wrap male threads with PTFE tape and connect expansion tank to tee fitting.

Step 4: Tighten securely, avoid over-torquing to avoid damage or leaks.

Step 5: Restore water supply slowly, check all connections for leaks.

Step 6: Verify air pre-charge matches system pressure using a calibrated gauge.