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WARNING
Adding water to hot boiler may result in heat
exchanger failure. Before filling boiler verify heat
exchanger is not hot. Failure to follow these
instructions could result in death or serious injury.
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 fitting 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 flow 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 filling of
your system.
• If your system is closed expansion tank system, you
may leave it open to refill 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. Will indicate loss of water due to leakage. Automatic
fill valve should compensate for this. Instructions are
packaged with the valve.
11 -GENERAL INSTRUCTIONS
21
PN 240013340 Rev. C [12/02/2022]
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