19
Filling System With Water
• 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.
STARTING YOUR BOILER
NOTICE
Do not add water into hot empty boiler.
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