Operating instructions

14
6. CLEANING A WATER BOILER
The oil and grease which accumulate in a new hot
water boiler can be washed out in the following manner.
A. Remove safety relief valve using extreme care to
avoid damaging it.
Certain state and local codes may restrict the use of
some chemicals listed for cleaning and maintaining the
boiler. Check with local authorities before proceeding
with the use of any chemicals.
B. Drain about 5 gallons of hot water from boiler into
a container and dissolve into it 1 pound of caustic
soda and one pound of trisodium phosphate for
each 50 gallons of boiler water.
C. Add solution through exposed tapping, and
reinstall safety valve.
D. Fill the entire system with water.
E. Start ring the boiler
F. Circulate the water though the entire system.
G. Vent the system, including the radiation.
H. Allow boiler water to reach operating temperature,
if possible.
I. Continue to circulate the water for a few hours.
J. Stop ring the boiler
K. Drain the system in a manner and to a location
that hot water can be discharged safely.
L. When the boiler has cooled down to 120°F or less,
remove plugs from all available returns and wash
the water side of the boiler as thoroughly as
possible, using a high-pressure water stream.
M. Rell the system with fresh water, and bring
water temperature to 180°F promptly in order to
drive off any dissolved gases.
7. WATER BOILER OPERATION
The following guidelines relating to system water
temperature uctuation and ow through boiler must be
observed.
A. It is important to operate your boiler in such a
manner as to prevent temperature uctuation of
more than 40°F at any time. Rapid temperature
changes within the boiler can create stresses in
the boiler metal. These stresses can cause
damage to the boiler by loosening tubes, or in
more severe instances can crack tube sheet
ligaments, furnaces, or waterlegs.
B. It is equally important to insure that there is
circulation through the boiler of at least 1/2 GPM/
BHP at all times when the boiler is ring.
5. CLEANING A NEW STEAM BOILER
Oil, grease & sediments which accumulate in a new
boiler and piping must be removed from the system in
order to prevent an unsteady water line and carryover of
the water into the supply main above the boiler. Operate
the boiler with steam in the entire system for a few days
allowing the condensate to return to the boiler. If the
condensate can temporarily be wasted, operate the
boiler only for the length of time it takes for condensate
to run clear. If the latter cannot be achieved or if the
condensate
is returned to the boiler, boil out the boiler using the
SURFACE BLOWOFF connection on the boilers so
equipped.
A. Drain boiler until water is just visible in gauge
glass. Run temporary pipe line from the surface
blow-off to an open drain or some other location
where hot water may be discharged safely.
Do not install valve in this line.
Certain state and local codes may restrict the use of
some chemicals listed for cleaning and maintaining the
boiler. Check with local authorities before proceeding
with the use of any chemicals.
B. Drain about 5 gallons of hot water from boiler into
a container and dissolve into it 1 pound of caustic
soda and one pound of trisodium phosphate for
each 50 gallons of boiler water. Additional
containers may be required to dissolve sufcient
chemicals for large models. Remove safety valve
and add solution to boiler water through exposed
tapping.
Use extreme care in handling these chemicals.
Caustic soda is harmful to skin, clothing and eyes. Do
not permit the dry material or the concentrated solution
to come into contact with the skin or clothing.
C. Close all valves leading to and from the system to
isolate the cleaning solution from the system.
D. Start Burner and operate sufciently to boil the
water without producing steam pressure. Boil for
about 5 hours. Open boiler feed pipe sufciently to
permit a steady trickle of water from the surface
blowoff pipe. Continue this slow boiling and
trickle of overow for several hours until the water
coming from the overow is clear.
E. Stop burner and drain boiler in a manner and
location that hot water can be discharged safety.
F. When the boiler has cooled to 120°F or less rell
boiler to normal water line. If water in gauge glass
does not appear to be clear, repeat steps A thru E,
boiling out the boiler for a longer time.
G. Remove temporary piping, plug tapping and/or
reinstall safety valve. Boil to bring water
temperature to 180ºF promptly in order to drive off
any dissolved gases in the fresh water.
NOTICE