I I¸_ Iiiiii ¸_ I I; Checking And Adjusting - Dunkirk XEB-3 Installation, Operation & Maintenance Manual

Operating Instructions.
1. Set the thermostat to lowestsetting.
2. Turn off allelectric power to the appliance.
3. This appliance is equipped with an ignition devicewhich auto-
maticallylights the burner. Do not attempt to light the burner
by hand.
4. Removeburner accesspanel.
Depress gas control knob slightlyand turn clockwisef_ to
5.
"OFF" position.
Figure 14 - Gas Control Knob
o
INLET i i_
/
GAS CONTROL KNOB
SHOWN IN "ON" POSITION
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NOTE: Knob cannot be turned to "OFF"unless knob is
depressed slightly.Do not force.
6.
7.
8.
9.
Waitfive (5) minutes to allowany gas in the combustion
chamber to vent. If you then smell gas in the appliance
area or near the floor, do not touch any electrical switch,
do not use the phone. Leavethe building immediately
and callyour gas supplier. If your gas supplier cannot be
reached, call the fire department. Failure to do so may
result in a fire or explosion. If you don't smell gas, go to
next step.
Turn gas control knob counterclockwise _'_ to "ON."
Turn on all electricpower to the appliance.
Set thermostat to desired setting.
After visuallyinspecting the flame,replace the lower front
panel.
If the appliancewill not operate after severaltries, turn the
gas control knob to "OFF" and call your servicetechnician
or gas supplier.
To Turn Off Appliance:
1. Set the thermostat to lowest setting.
2. Turn offall electricpower to the appliance if servicing is to be
performed.
3. Depress gas control knob slightlyand turn clockwise/_ to
"OFF" position. Do not force.
Gas Valve Safety Shutdown Test
With main burners firing, disconnect the ignition cable from the
intermittent pilot control box. The gas valve should shut offthe main
burners. TURN OFF ELECTRIC POWER to boiler before recon-
necting ignition cable, to prevent electric shock.
Adjust Pilot Burner
.
2.
Removescrew cover over pilot adjusting screw.
Insert small screwdriver and adjust flame as needed (Figure
#16. Turn screwcounterclockwise _"_ to increase flame,
clockwiseto decrease (Figure #17).
3. Replacescrew coverover 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.
Puffsof air from blowing on the flame or stamping on the floor will
causethe flames to turn orange momentarily. Thisis not unusual.Re-
main stillwhen observing the main burner flames.Referto Figure
#17. If the flame appearance is not correct, check main burner ori-
fices and the burner throat and flame ports for dust and lint obstruc-
tion. It may be necessary to remove the rollout shield to observe the
main burner flames.Replacerollout shield after observation.