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4.
Turn the boiler ON.
The burner
will
cycle through the pre-purge and
pilot
ignition trial.
After
a proof-of-pilot test, the electric gas shut-off
valve(s)
in the
main gas
train will
begin to open.
After
a
proof-of-main
flame trial, the
RUN INDICATOR
on the controller
will light.
THE BOILER
IS NOW
ON LOW FIRE.
NOTE:
CHECK CONTROLLER AMPLIFIER SIGNAL
MICROAMPEREMETER.
THE
READING SHOULD BE STEADY
ABOVE MINIMUM INDICATED IN
THE
FLAME CONTROL
MANUAL.
WARN
IN
G:
If the linkage arrangement begins
to move after the
RUN
light
appears,
turn
the
boiler OFF immediately .The manual
potentiometer, low fire hold,
and/or
modu
lation
controller is not operating correctly or is
wired
wrong.
The
flame in
this
burner normally
appears
yellow
at
lower
tiring
rates.
DO NOT
A TIEMPT TO REDUCE FUEL FLOW AND
MAKE
THE FLAME
BLUE.
IF AT
ANYTIME
DURING
MAIN
FLAME
TESTING
,
THE BURNER
EXHIBITS
UNSTABLE OPERATION {PULSING,
EXCESSIVE
NOISE,
VIBRATING
STACK,
ETC.
),
TURN BURNER OFF
IMMEDIATELY.
5.
Note
the
oxygen
concentration of
the
flue
gas.
•
Repeat main
flame ignition to ensure
smooth
light off.
6.
Allow the boiler
to
come
up
to operating pressure/temperature
(approximately
45
minutes}.
•
Slowly rotate the manual potentiometer
in increments toward
the
OPEN
position.
noting oxygen concentration as the
mod motor
modulates.
until the
manual
potentiometer
is In the FULL OPEN
position.
THE BURNER IS NOW AT HIGH
FIRE.
•
Adjust
natural
gas pressure to
the value listed. in
the fire test
report.
•
Note
oxygen concentration
•
Modulate
the burner to low fire by
rotating
the manual potentiometer to the
CLOSED position
,
noting oxygen
concentration
as the burner modulates
down.
Section 5
-
Start-up
19
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