TriangleTube HL-20, Service Technician Manual

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Is the expansion tank on the boiler side properly sized?
- The additional quantity of boiler water contained in the outer tank must be considered when sizing the
boiler side expansion tank.
- Insufficient allowance for expansion on the boiler side can cause the boiler pressure relief valve to lift.
Is the expansion tank defective, water logged or improperly charged?
- Check for failed gaskets or bladders, or a faulty Schraeder valve.
- Use a tire gauge to check the charged pressure of the tank
Action Item:
- Increase the boiler operating temperature and let the system run at the higher temperature.
This will simulate maximum expansion in the boiler system.
- If the boiler relief valve lifts and/or there is a significant increase in the boiler system pressure,
the expansion tank is flooded or undersized.
Is the boiler pressure relief valve functioning properly?
- Dirt and water deposits can accumulate under the valve seat.
Check the boiler automatic fill valve for defects.
- Is the valve filling to the correct pressure?
Check for possible inner tank leak
- If possible, isolate the Triangle Tube tank from the boiler system for an extended period of time.
Observe the boiler system pressure during that time.
Boiler Relief Valve Lifting or Weeping
7
Boiler Side
Model Capacity gal.
TR-20 8
TR-30 9
TR-36 12
TR-45 8
TR-60 8
TR-75 15
TR-120 30
SMART 20 / HL-20 5
SMART 30 / HL-30 5
SMART 40 / HL-36 6
SMART 50 / HL-45 8
SMART 60 / HL-60 8
SMART 80 14
SMART 100 25
SMART 120 43