Crown Boiler 24-12 用户手册

the drain cocks at boiler and in return main and

feed water slowly up to normal level in boiler.

Turn on 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.

f. 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 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 burner, drain boiler, open gate

valve in Hartford Loop, then repeat step (1)

above.

5. 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

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 appropriate water treatment chemicals, if

necessary to bring the pH within the speciﬁed range.

6. Boiler is now ready to be put into service.

BOILER AND SYSTEM CLEANING - WATER

BOILERS
1. 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

normal system design operating pressure. To insure

that the system is full, water should come out of all

air vents when opened.

2. 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.
a. Remove safety relief valve using extreme care to

avoid damaging it.

b. Add an appropriate amount of recommended

boilout compound.

c.  Reinstall safety relief valve.
d.  Fill the entire system with water.
e.  Start ﬁring the boiler.
f.  Circulate the water through 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 ﬁring the boiler.
k.  Drain the system in a manner and to a location

that hot water can be discharged with safety.

l. 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. Reﬁll the system with fresh water.

3. Add appropriate boiler water treatment compounds

as recommended by your local qualiﬁed water

treatment company.

4. 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 appropriate water treatment

chemicals, if necessary to bring the pH within the

speciﬁed range. With this lower level of protection,

care must be exercised to eliminate all of the free

oxygen in the system.

5. Boiler is now ready to be put into service.