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31
iv. Stop feeding water to boiler but continue
operating oil burner until excess water in
boiler ows 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.
v. When boiler has cooled down sufciently
(crown sheet of sections are not too hot to
touch), close the drain valves 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 tting 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
relling 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 valve in
return main, turn on oil burner and allow
Condensate to ow 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 the full "Boiler and System Cleaning"
procedure outlined in Paragraph B starting
on Page 30.
e. Make pH or Alkalinity Test.
After boiler and system have been cleaned and
relled 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
specic 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 specied 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,
NOTICE
Check with local authorities or consult local
water treatment services for acceptable chemical
cleaning compounds.
iii.
Start burner and operate sufciently to boil
the water without producing steam pressure.
Boil for about 5 hours. Open boiler feed
pipe sufciently to permit a steady trickle
of water from the surface blow-off pipe.
Continue this slow boiling and trickle of
overow for several hours until the water
coming from the overow is clear.
iv.
Stop burner and drain boiler in a manner
and to a location that hot water can be
discharged with safety.
v.
Rell 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 CL
Series should be maintained with appropriate
water treatment compounds. Add suitable water
treatment compounds as recommended by your
qualied water treatment company.
c. Remove temporary surface blow-off 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 9 and proceed as follows:
i Connect hoses from drain valves to oor
drain. Close gate valve in Hartford Loop and
open drain valve 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, owing from drain hose at about
180°F. Continue until water runs clear from
drain hose for at least 30 minutes.