Lennox International Inc. GWB8-112IE-2 Benutzerhandbuch

• Close air vents on all radiation units. Open valves to 

these units. 

• Verify boiler and expansion tank drain valves are closed. 

Air bleed screw on tank drain fi tting should be closed. 

• Open valve in line from boiler to expansion tank. 
• Open water inlet to your boiler and leave open. 
• Start with lowest radiation unit. Open air vent on this 

unit. When all air has escaped and water starts to fl ow 

from vent, close it. 

• Go to next radiation unit, and repeat this process. 
• Repeat until you have covered every radiation unit in 

system. End at highest unit in system. 

• If units have automatic vents, manual venting is 

unnecessary but it will speed up proper fi lling of system.

• If system is closed expansion tank system, you may 

have automatic fi ll valve. Leave it open to refi ll system 

automatically as needed. 

• Check temperature-pressure gauge. Note position of 

hand indicating pressure. This should be between 10 

and 15 psi. Any lowering of this movable hand below 

10 psi indicates loss of water due to leakage. Automatic 

fi ll valve should compensate for this. Instructions are 

packaged with valve.

Do not add water into hot empty boiler.