Operating instructions

14 GALAXY
C.Main Burner Ignition Check-out and Pilot Adjustment
1. The pilot flame must not smother or snuff out when
tested as follows:
i. Main burner ignition from cold start-repeat.
ii. Continued operation of main burner.
iii.Main burner ignition with appliance at maximum
operating temperature after prolonged operation.
NOTE: Observe operation of the pilot burner with appli-
ance doors in the final operating position. Use of a mir-
ror may be helpful.
2. Safety Shutdown Check-out
i. Make certain the pilot burner holds in, and the power-
pile valve (if used) opens properly, when the pilot is
burning normally; and that safety shutdown occurs
within 2-1/2 minutes after the pilot flame is extin-
guished. Observe operation for at least one cycle
under automatic control to be sure the system is
functioning normally.
ii. For proper operation the pilot should engulf the ther-
mocouple, power-pile generator or flame sensor as
shown below.
iii.To adjust pilot, turn pilot flow adjustment screw on
valve clockwise or counterclockwise to give a steady
flame enveloping 10 mm to 13 mm (
3
/
8" to
1
/
2") of the tip
of the thermocouple, generator or flame sensor. Note
that turning the pilot adjustment screw clockwise will
decrease the pilot flame.
iv. Check safety shutdown of gas valve by following pro-
cedure outlined "CARE AND MAINTENANCE" section.
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
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.
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 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
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.
10 mm – 13 mm (
3
/8" to
1
/2")