CIIAPTER3
CAUTION!
The
lockout
switch
must
be
manually
reset
following
a
safety
shutdown.The
cause
for
loss
of
flame
or
any
unusual
condition
should
be
lnves-
tlg~ted
and
corrected
before
at-
tempting
to
restart
In
order
to
avoid
damage
to
the
equipment.
(1)
No pilot flame.
The
pilot flame must be ignited and
proven within a 1 0-second period after
the ignition cycle begins.
If
not proven
within this period, the main fuel valve
circuit will not be powered and the fuel
valve(s) will not be energized.
The
igni •
tion circuit is inuilediately de--energized
and the pilot valve closes.
The
reset
switch lights and lockout occurs
immedi·
ately.
The
blower
motor
will
continue
to
operate. The flame failure light and the
alarm bell (optional) are energized
10
seconds later.
The blower motor will
be de--energized.
The lockout switch must be manually
reset before operation can be resumed.
(Refer
to the previous caution.)
(2)
Pilot
but
no
main
flame.
When the pilot flame
is
proven, the main
fuel valve circuit
is
energized. Depending
upon the length
of
the trial-for-ignition
period, the pilot flame will be extin-
CHAPTER 3-10
SEQUENCE
OF
OPERATION
guished 10
or
15 seconds later. The flame
detecting circuit will respond
to
de-ener-
gize the main fuel valve circuit within 2
to
4 seconds to stop the flow
of
fuel. The
reset switch lights and lockout occurs
immediately.
The
blower motor will con-
tinue to operate.
The flame failure light and alarm bell
(optional) are energized 10 seconds later.
The blower motor will
be de-energized.
The lockout switch must be manually
reset before operation can be resumed.
(Refer to the previous caution.)
(3)
Loss
of
flame.
If
a flame outage occurs during nonnal
operation and/or the flame is no longer
sensed by the detector, the
flame relay
will trip within 2
to
4 seconds to de-ener-
gize the fuel valve circuit and shut
off
the
fuel flow. The reset switch lights and
lockout occurs immediately. The blower
motor continues operation. The flame
failure light and alarm bell (optional) are
energized
10 seconds later.
The blower motor will be de-energized.
The lockout switch must be manually
reset before operation can be resumed.
(Refer
to
the previous caution.)
If
the burner will not start, or upon a
safety lockout, the trouble shooting
sec-
tion in the operating manual and the tech-
nical bulletin should be referred to for
assistance in pinpointing problems that
may not
be
readily apparent.
750-150
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