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Monitor GF1800 - Page 60

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SYMPTOM
CHECK1
RESULT
1
CHECKS
CHECK3
RESULT
I
CHECKS
I I
RESULT
Is
there
OV at
IC7(©pin)?
FLAME
ROD
BYPASS CIRCUIT
For
testing purposes
— A
flame detector
rod
bypass circuit
can be
made
up,
consisting
of 2
insulated
alligator
clips,
2-6*
pieces
of
insulated
copper wire,
1 -1
ampere
400
volt
diode,
and
1-1/4
watt
100K
OHM
resistor.
These components
are to be
soldered together
in
sequence
as
shown
in
diagram below (note
component
sequence
and
polarity).
Once
the
bypass circuit
is
made
the
unit
is
turned
on,
immediately
after
the
prepurge
cycle; when mode
light
comes
on, the 0 and N
pins
are
disconnected
off
the
PCS
and
replaced
with
the
bypass
circuit
The
unit
should
then
continue
functioning
as
though
it had a
good flame
inside
the
bum
chamber.
(Note-WARNING,
after
all
tests
are
completed,
replace
original
flame
rod
wires
as
it is a
vital
safety feature.)
CLIPS
REASON
Failure
of
resistor.
(R8-R11)
Failure
of
transformer.
Failure
of
capacitor.
(C16-C18)
Failure
of
resistor.
(H6,
R12-R15)
Failure
of
resistor.
(R19,
R57)
Failure
of
capacitor.
(C33)
Failure
of
diode.
(D27,
029)
Failure
of
transistor
array.
(IC11)
Failure
of
resistor.
(R16-R18)
Failure
of
microprocessor.(IC1)
Failure
of
wiring
for
flame
sensor
and
ground.
Incorrect
installation
of flame
sensor
rod.
Rame
rod has
burned
off or
has
broken
loose.
Failure
of
comparalor.(IC7)
CORRECTIVE
ItSKK
Replace
transSrmr.
•
Correct
wiving.
Correct
instil
laon.
1
Replace
liumlorbmjiwa
sensor.
w:

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