CHAPTER6
Familiarity with the programmer and other
con-
trols
in
the system may be obtained by studying
the contents
of
this manual and the bulletin.
Knowledge
of
the system and its controls will
make
trouble
shooting
much
easier. Costly
down-time
or
delays can be prevented by
sys-
tematic checks
of
the actual operation against the
normal sequence to determine the
stage
at which
performance deviates from normal. Following a
routine may possibly eliminate overlooking
an
obvious condition, often
one
that is relatively
simple to correct.
If
an obvious condition is not apparent, check the
continuity
of
the circuits with a voltmeter
or
test
lamp. Each circuit
can
be
checked and the fault
isolated and corrected. Most circuitry checking
can be done between appropriate terminals
on
the
terminal boards in the control cabinet
or
the
entrance box. Refer
to the schematic wiring
diagram for terminal identification.
A.
BURNER
DOES
NOT
START
(1)
No
voltage
at
the
program
relay
power input terminals.
(a) Main disconnect switch open.
(b) Blown control circuit fuse.
(c) Loose
or
broken electrical connection.
(2) Program relay safety switch requires
resetting.
(3) Limit circuit
is
not
completed-
no
voltage at end
of
limit circuit program
relay terminal.
CHAPTER 6-2
TROUBLE SHOOTING
(a) Pressure
or
temperature
is
above set-
ting
of
operation control. (Load demand
light will not glow.)
(b) Water below required
level.
(i)
Low
water light (and alarm
hom)
should indicate this condition.
(ii)
Check
manual reset button,
if
provided,
on
low water control.
(c) Fuel pressure
must be within settings
of
low
pressure
and
high
pressure
switches.
(d)
Oil
fired unit - burner gun must be
in full
forward
position
to
close
oil
drawer switch.
·
(e)
Heavy
oil frred
unit-
oil temperature
below minimum setting.
(4) Fuel valve interlock circuit not
com-
pleted.
{a) Fuel valve auxiliary switch not closed.
B.
NO
IGNITION
(1) Lack
of
spark.
(a)
Electrode
grounded
or
porcelain
cracked.
750-150
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