Slant/Fin GXHA-200 User Manual

Page 13

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13

GALAXY STEAM BOILER

Replacement of Steam Boilers

Anytime an older steam boiler is removed from the heating sys-
tem and replaced with a new boiler, there are certain conditions
that have to be examined on the heating system.

1. Steam systems have a tendency to develop scale inside the

wet return lines and the boiler. The older the system the
greater the accumulation of scale that can exist inside the
piping. Therefore, it is necessary when replacing a steam
boiler to check the piping for blockage or restrictions. Clean
or replace the piping as required.

2. Replace all buried wet return lines.

3. All equipment (air vents, radiation equipment, etc.) in the

steam heating system should be checked for proper opera-
tion. All piping should be checked for proper pitch.

4. It is good engineering practice to repack or tighten the pack-

ing nuts on all valves in the heating system.

BLOWING OFF A LOW PRESSURE STEAM BOILER

1. MODELS THAT HAVE NO TANKLESS HEATER OR NO

PROVISION FOR HEATER

A.Those models without tankless heaters or provision for

tankless heaters have a skimmer giving the advantages of
a surface blow pipe, that has been built into the casting to
insure rapid skimming of oil and grease through a 3/4"
N.P.T. tapping located on the right hand jacket side panel,
8-9/16" from the top and 13-1/4" from the front of the boil-
er (see Figure A).

B.Turn off electrical power supply to boiler. Allow boiler to

cool down and steam pressure to reduce to zero before
removing skimmer tapping plug. Check for steam pressure
by testing the pop safety valve. Keep your hands and all
parts of your body away from the discharge end of the
safety valve. Drain boiler down one to two inches below
skimmer tapping. There will be water in the skimmer
trough. The water might be hot. Remove skimmer plug
slowly and carefully. Install 3/4" skimmer valve, elbow and
length of pipe and place a bucket underneath the open
end of the pipe. Cover bucket with a piece of cloth.

C.Fill boiler slowly until water level is two inches from top of

gauge glass. (This is the starting water level for skimming
only.) Fire boiler to produce steam. If the system is heavily

FIGURE A
Right side view of Galaxy models that are NOT equipped
with or DO NOT have provisions for tankless heaters.

FIGURE B
Left side view of Galaxy models that are equipped with or
have provisions for tankless heaters.

laden with oil, it may be difficult to obtain much more than
a pound or so of pressure. Set the pressure control at
about 7 psi. The higher the steam pressure you can use,
the better and faster the cleaning.

D.As a steam develops, open the SKIMMER drain valve with

caution to skim the oil and film from the top of the water.
DO NOT open the boiler drain valve. Close the skimmer
drain valve when the water level drops to about 5" from
the top of the gauge glass. The water may stop before the
level drops to 5" below the top of the glass. Refill boiler
until water level is again two inches from the top of the
gauge glass.

E.Repeat (D) above until all film is skimmed off and the

water settles to a desired normal movement. Add makeup
fresh water to the boiler as described in (D) above during
the blow-off operation to maintain the proper skimming
water level in the vessel. Empty bucket frequently in order
to see the difference in water cleanliness.

F. When surging has stopped and water is clean, and no film

can be seen floating in the bucket, shut off boiler, drain
down to level of skimmer tapping, remove valve, plug
skimmer tapping and refill the boiler to the normal operat-
ing water (25-1/2" from the bottom of the boiler—see
Figure A below). Check the pop safety valve for proper
operation.

G.The entire process may have to be repeated over a period

of a few days on extremely fouled systems.

2. MODELS WITH TANKLESS HEATER OR WITH TANKLESS

HEATER PLATES ONLY.

A.Turn off electrical power supply to boiler. Allow boiler to

cool down and allow pressure to reduce to zero before
attempting removal of components. Check for steam pres-
sure by testing safety valve. Keep your hands and body
away from the discharge end of the valve. Remove pop
safety valve and re-pipe boiler as shown in Figure B
below, making sure to reinstall pop safety valve on tee to
complete the blow off connection.

B.Connect a length of pipe to the elbow and place a bucket

underneath the open end of the pipe, cover bucket with a
piece of cloth.

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