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GALAXY
CONTROLS, SAFETY CHECK
Check all safety controls not previously mentioned. Also, follow
directions in "CARE AND MAINTENANCE" section, paragraphs IV
through VI.
These boilers are equipped with both a draft hood blocked vent
safety switch and a rollout safety switch. The blocked vent safety
switch is located on the draft hood flue stack. This is a manual
reset control used to prevent excessive spillage of flue gases
from the draft hood. The rollout safety switch is a single use (one
time) thermal fuse to prevent the boiler from operating if flue pas-
sages are blocked. If either of these devices shut down the burn-
ers, follow instructions in the section "To Turn Off Gas To
Appliance" and call your service technician or gas supplier.
LOW WATER CUT-OFF CHECK-OUT
A. Electronic Probe Type Low Water Cut-off. If this boiler is fac-
tory equipped with an electronic probe type low water cut-
off, operation of cut-off should be checked at least twice a
year as follows.
1. While boiler is running, drain down boiler water slowly
through Boiler Drain Cock shown on page 7, just until light
goes on. Boiler should shut down 90 seconds after light
goes on.
2. Be sure that it is the low water cut-off and not the room
thermostat, pressure cut-out, energy cut-off or other con-
trol that has shut off the burner.
3. Refill the boiler and repeat test.
4. Refill the boiler and reset controls for normal operation.
B. Float type low water cut-off
If this boiler is factory equipped with a McDonnell & Miller
float type low water cut-off, the low water cut-off must be
blown down (flushed), at least once a week.
CAUTION: When flushing float type low water cut-off control,
hot water and steam will flow out the blow down valve. Blow
down valve is illustrated on page 5.
Steam controls assembly.
1. SPECIAL FLUSHING INSTRUCTIONS
Installation of new boiler may break loose a heavy
accumulation of sediment and scale from old piping and
radiators. It is extremely important to blow down your
McDonnell Cut-off more frequently the first week.
First week — 3 times
Thereafter — at least once a week
2. As boiler water circulates through the float chamber, dirt or
other sediment may be deposited. This chamber is extra
deep. But the only sure way to keep any accumulation
from interfering with float action is to "blow down," or flush
out, the control once a week.
Do it while boiler is in operation. First note water level in
gauge glass. Open blow-off valve at bottom of control;
water will pour out, flushing away sediment. Drain until
water is clear—about a pail—then close valve. If level in
gauge glass has dropped, add water to boiler to restore
level.
3. NOTE: Opening blow-off valve checks cut-off operation
too. As float drops with falling water level, burner will stop.
After valve is closed and normal operating conditions
restored, burner will resume firing.
4. Be sure that it is the low water cut-off and not the room
thermostat, pressure cut-out, energy cut-off or other con-
trol that has shut off the burner.
PRESSURE CONTROL CHECK-OUT
A. Check burner to be certain it is ready for firing. DO NOT FIRE
into an empty boiler.
B. Set thermostat high enough for boiler to make steam. Set the
pressure control down to its lowest setting. As the boiler
starts to produce steam, the steam pressure will start to
build. The burner will shut off when the steam pressure
exceeds the pressure setting (plus differential if the control
has this feature).
C. Adjust the pressure control to a higher setting. The higher
setting should be above the steam pressure in the boiler.
This should turn the burner back on.
D. Reset the pressure control as needed for the system. The
pressure control should be checked out at least twice a year.
Steam Controls Installation Instructions
A. Steam kit components for Galaxy packaged models are
packed as follows:
1. Low water cut-off control, electric, installed.
2. Pressure gauge.
3. High pressure limit control.
4. Water level gauge.
5. Fittings
6. Instruction sheet and assembly drawing.
7. Steam safety valve and
8. Drain cock.
Assembly above components exactly as shown.
Two
/
" tappings are on right side of boiler for this assembly.
1
2
Two holes are pre-punched in jackets.
Replacement of Steam Boilers
A. Anytime an older steam boiler is removed from the heating
system and replaced with a new boiler, there are certain
conditions that have to be examined in 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 restric-
tions. Clean or replace the piping as required. (See special
flushing instructions page 18.)
2. All equipment (air vents, radiation equipment, etc.) in the
steam heating system should be checked for proper oper-
ation. All piping should be checked for proper pitch.
3. It is good engineering practice to repack or tighten the
packing nuts on all valves in the heating system.
BLOWING OFF A LOW PRESSURE STEAM BOILER
A. MODELS THAT HAVE NO TANKLESS HEATER OR NO
PROVISION FOR HEATER
1. 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
tapping located on the right hand jacket side panel, 217
mm (8
9
/
") from the top and 337 mm (13
16
of the boiler (see Figure A).
3
/
" street coupling.
4
1
/
") from the front
4
17
/
" N.P .T.
3
4
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