Pilot Flame Adjustment; Automatic Gas Valve - Dunkirk XEB-2 Installation Manual

orange momentarily. This is not unusual. Remain
still when observing the main burner flames. Refer
to Figure #16. 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.
ADJUST LIMIT CONTROLS
Instructions for each control are included with the
controls.
RECOMMENDED BOILER WATER TEMPERATURES
Type of Heating Unit
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 FINAL ADJUSTMENT
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. After
setting limit control to desired setting, check 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.
CheCkING ANd AdjuStING
Limit Control Setting
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.
Figure #14

PILOT FLAME ADJUSTMENT

AUTOMATIC GAS VALVE

PRESSURE REGULATOR ADJUSTMENT
(UNDER CAP SCREW)
INLET
PRESSURE
TAP
INLET
GAS CONTROL KNOB
28
Flame
on
Sensor
Figure #15
WIRING
TERMINALS (2)
OUTLET
ON
OFF
PILOT ADJUSTMENT
(UNDER CAP SCREW)
OUTLET
PRESSURE
TAP
GROUND
TERMINALS
(2)
PILOT
OUTLET