Dunkirk XEB-2 Installation Instructions Manual page 25

GAS VALVE SAFETY SHUTDOWN TEST
With main burners firing, disconnect the ignition cable
from the intermittent pilot control box. The gas valve
should shut off the main burners. TURN OFF
ELECTRIC POWER to boiler before reconnecting
ignition cable, to prevent electric shock.
ADJUST PILOT BURNER
1. Remove screw cover over pilot adjusting screw.
2. Insert small screwdriver and adjust flame as needed.
(Fig. 14). Turn screw counterclockwise to increase
flame, clockwise to decrease (Fig. 15).
3. Replace screw cover over pilot adjusting screw.
MAIN BURNER(S)
The main burners do not require primary air
adjustment and are not equipped with primary air
shutters. Main burner flames should form sharp
blue inner cones in a softer blue outer mantel, with
no yellow. Puffs of air from blowing on the flame or
stamping on the floor will cause the flames to turn
orange momentarily. This is not unusual. Remain
still when observing the main burner flames. If the
flame appearance is not correct, check main burner
orifices and the burner throat and flame ports for
dust and lint obstruction. It may be necessary to
remove the rollout shield to observe the main burner
flames. Replace rollout shield after observation.
Refer to Figure 16.
ADJUST LIMIT CONTROLS
Instructions for each control are included with the controls
to see if it shuts off the gas supply to the
burners.Turn your thermostat up to call for heat
and let your boiler run until the temperature of the
water reaches the limit setting. The gas valve should
shut off and the circulator keep running until the
thermostat is satisfied, or the water cools enough
to restart the burners through the limit control.
To check the operation of the contacts in the
pressure switch, disconnect the rubber tubing
(located between the blower and the pressure
switch) from the pressure switch, while the boiler
is operating. The burners should extinguish and
the blower should keep running. When the tubing
is reconnected to the pressure switch, the ignition
sequence should begin, resulting in ignition of the
main burners.
Finally, set the thermostat for the desired
temperature. Special conditions in your home and
the location of the thermostat will govern this setting.
Safe lighting and other performance criteria were
met with the gas manifold and control assembly
provided on the boiler when the boiler underwent
tests specified in ANSI Z21.13-latest revision.
f
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Flame
on sensor
RECOMMENDED BOILER WATER TEMPERATURES
Tvoe of Heatina Unit Limit Control Settina
Standing Radiators.............................................180°F
Baseboard and Convector Radiators ..............200 ° F.
These settings can be changed after you have had
some idea how the system works. Example: If your
system does not give quite enough heat in very cold
weather, you can raise the limit setting to 220 ° F.
ADJUST THERMOSTAT HEAT ANTICIPATOR
INSTRUCTIONS FOR THE FINALADJUSTMENT
OF THE THERMOSTAT ARE PACKAGED WITH
THE THERMOSTAT. Set Heat anticipator at .2.
Check thermostat operation. When set above
temperature indicated on the thermometer, boiler
burners should ignite. Make certain the thermostat
turns off the boiler when room temperature reaches
the selected setting and starts the boiler operating
when room temperature falls a few degrees.
Aftersetting limit control to desired setting, check
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