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HOWA HOT-WATER SYSTEM OPERATES
Your entireheating system (boiler, piping and radialJon
units) is filled with water. As the water in the boiler is
heated, itis pumped from the top of the boilerthrough
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.
FILLING 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 (see page 15 for
additional information). Open the water inlet to
your boiler and leave itopen. 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.
Ifyour system is a closed expansion tank system,
you may have an Automatic Fill Valve. You may
leave it open to refill the system automatically as
needed. Check the temperature-pressure gauge.
Note 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 packaged with the valve.
WARNING-Never run water into a hot empty boiler. I
•This appliance isequipped with an ignitiondevice
which automatically lights the burner. Do not
attempt to light the burner by hand.
WARNING: If you do not follow these
instructions exactly, fire or explosion may
result with property damage, personal injury,
or loss of life.
2. BEFORE OPERATING smell all around the
appliance area for gas. Be sure to smell next to
the floor because some gas is heavier than air
and will settle on the floor.
WARNING: IF YOU SMELL GAS:
Do not attempt to operate any appliance, do
not touch any electrical switch, do not use
the phone.
Leave the building immediately and call your
gas supplier.
If your gas supplier cannot be reached, call
the fire department.
3. WARNING: When turning or depressing the
gas control knob, use only your hand to push
down or turn the knob. Never use tools. If
the knob will not operate by hand, the control
must be replaced by a qualified service
technician. Force or attempted repair may
result in a fire or explosion.
4. WARNING: If any part of this appliance has
been under water, do not operate.
Immediately call a qualified service technician
to inspect the appliance and to replace any
part of the gas control system which has been
under water.
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