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HOW A HOT-WATER
SYSTEM
OPERATES
Your entire
heating system (boiler,
piping and radiation
units) is filled with water.
As the water in the boiler is
heated,
it is pumped
from the top of the boiler through
the supply main to the radiation
units.
The cooler water
in them flows back through
the return
main to the boiler.
This provides positive
and rapid response to the
thermostat.
FILLI"NG
SYSTEM
WITH
WATER
Close the air vents on all radiation
units.
Open the valves to these units.
Make sure the boiler and expansion
tank drain cocks are closed.
The air bleed screw on the tank drain fitting
should be closed.
Open the valve in the
line from the boiler to the expansion
tank.
Open the water inlet to your boiler and leave it open.
Start with the
lowest
radiation
unit.
Open the air vent on this unit.
When all the air has escaped and water starts to flow from
the vent,
close it. Go to the next radiation
unit, and repeat this process.
Repeat until you have covered every
radiation
unit in the system (ending
up at the highest unit in the system).
If your units have automatic
vents,
this manual
venting
is unnecessary
but it will speed up the proper filling of your system.
If your system is a
closed expansion
tank system, you may leave it open to refill the system
automatically
as needed.
Check the
temperature
pressure gauge.
Not the position
of the hand indicating
pressure.
This should be between
10 and
15 Ibs. Any lowering
of this movable hand below 10 Ibs. Will indicate loss of water due to leakage.
The
automatic
fill valve should compensate
for this.
Instructions
are packages
with the valve.
WARNING
- Never run water into a hot empty boiler.
19
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