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v. When boiler has cooled down sufficiently
(crown sheet of sections are not too hot to
touch), close the drain cocks at boiler and in
return main and feed water slowly up to
normal level in boiler. Turn on oil burner
and allow boiler to steam for 10 minutes,
then turn off burner. Draw off one quart of
water from bottom gauge glass fitting and
discard. Draw off another quart sample and
if this sample is not clear, repeat the cycle
of draining the boiler and return main and
refilling the boiler until sample is clear.
vi. If the boiler water becomes dirty again at a
later date due to additional sediment
loosened up in the piping, close gate valve
in Hartford Loop, open drain cock in return
main, turn on oil burner and allow
Condensate to flow to drain until it has run
clear for at least 30 minutes while feeding
water to boiler so as to maintain normal
water level. Turn off oil burner, drain
boiler, open gate valve in Hartford Loop,
then repeat step 1 above.
e. Make pH or Alkalinity Test.
After boiler and system have been cleaned and
refilled as previously described, test the pH of
the water in the system. This can easily be done
by drawing a small sample of boiler water and
testing with hydrion paper which is used in the
same manner as litmus paper, except it gives
specific readings. A color chart on the side of
the small hydrion dispenser gives the reading in
pH. Hydrion paper is inexpensive and
obtainable from any chemical supply house or
through your local druggist. The pH should be
higher than 7, but lower than 11. Add some of
the washout chemical (caustic soda), if
necessary, to bring the pH within the specified
range.
f. Boiler is now ready to be put into service.
2. WATER BOILERS
a. Filling of Boiler and System — General —-In a
hot water heating system, the boiler and entire
system (other than the expansion tank) must be
full of water for satisfactory operation. Water
should be added to the system until the boiler
pressure gauge registers 12 psi. To insure that
the system is full, water should come out of all
air vents when opened.
b. Boiling Out of Boiler and System. The oil and
grease which accumulate in a new hot water
boiler can be washed out in the following
manner.
i. Remove safety relief valve using extreme
care to avoid damaging it.
ii. Add an appropriate amount of
Continue this slow boiling and trickle of
overflow for several hours until the water
coming from the overflow is clear.
iv. Stop burner and drain boiler in a manner
and to a location that hot water can be
discharged with safety.
v. Refill boiler to normal water line. If water
in gauge glass does not appear to be clear,
repeat steps (i. thru iii.) and boil out the
boiler for a longer time.
b. Low pressure steam boilers such as the V7
Series should be maintained with appropriate
water treatment compounds. Add suitable water
treatment compounds as recommended by your
qualified water treatment company.
c. Remove temporary surface blowoff piping, plug
tapping and reinstall safety valve. Boil or bring
water temperature to 180°F promptly in order to
drive off the dissolved gases in the fresh water.
d. If unsteady water line, foaming or priming
persist, install gate valve in Hartford Loop and
drain valves in return main and at boiler as
shown in Figure 8 and proceed as follows:
i Connect hoses from drain cocks to floor
drain. Close gate valve in Hartford Loop
and open drain cock in return main. Fill
boiler to normal water level, turn on oil
burner and operate boiler at this water level
for at least 30 minutes after the condensate
begins to run hot, then turn off burner.
Close all radiator valves. Remove all supply
main air valves and plug the openings in
supply main.
ii. Draw about 5 gallons of hot water from
boiler into a container and dissolve into it
the appropriate amount of a recommended
boilout compound. Remove safety valve
from boiler and pour this solution into
boiler, then reinstall safety valve.
iii. Turn on oil burner and keep operating
while feeding water to boiler slowly. This
will raise water level in boiler slowly so that
water will be boiling hot and will rise
slowly into supply main and back through
return main, flowing from drain hose at
about 180°F. Continue until water runs
clear from drain hose for at least 30
minutes.
iv. Stop feeding water to boiler but continue
operating oil burner until excess water in
boiler flows out through supply main and
water lowers (by steaming) until it reaches
normal level in boiler. Turn off oil burner.
Drain boiler. Open all radiator valves.
Reinstall all supply main air valves. Open
gate valve in Hartford Loop.