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12 -GENERAL INSTRUCTIONS
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 it 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 units in
the system (ending up at highest unit in system).
• If your units have automatic vents, manual venting is
unnecessary but it will speed up the proper fi lling of
your system.
• If your system is closed expansion tank system, you
may leave it open to refi ll system automatically as
needed.
• Check temperature pressure gauge. Not position of hand
indicating pressure. This should be between 10 and 15
psi. Any lowering of this movable hand below 10 psi.
Will indicate loss of water due to leakage. Automatic
fi ll valve should compensate for this. Instructions are
packaged with the valve.
NOTICE
Never run water in a hot empty boiler.