GALAXY
13
d. Check safety shutdown of gas valve by following proce-
dure outlined "CARE AND MAINTENANCE" section.
VIII. CONTROLS, SAFETY CHECK
Check all safety controls not previously mentioned. Also,
follow directions in "CARE AND MAINTENANCE" section,
paragraphs IV through VII.
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 passages are blocked. If either
of these devices shut down the burners, 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.
1.
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.
SPECIAL FLUSHING INSTRUCTIONS
Installation of new boiler may break loose a heavy accu-
mulation of sediment and scale from old piping and radia-
tors. 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 accumula-
tion 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
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 3/4" street coupling.
8. Drain cock.
Assembly above components exactly as shown.
Two 1/2" tappings are on right side of boiler for this assembly.
Two holes are pre-punched in jackets.
Steam controls assembly
