SEQUENCE
ANALYSIS
12
01/01/2016
the
fan
switch
contact
(SW2)
is
defective,
replace.
The
burner
switch
(SW3)
must
be
in
"OFF"
position.
B2.
If
fan
#1
does
not
pull
in
and
voltage
is
present
at
terminal
#24
(120
volts),
check
load
side
of
starter
coil
for
presence
of
voltage
when
fan
switch
(SW2)
is
depressed.
If
voltage
is
present
at
load
side
of
coil
on
starter
(S1),
the
holding
coil
is
defective
and
must
be
replaced.
Check
all
coils
on
other
fan
starter(s)
(S2,
S3,
S4)
in
sequence
to
find
defective
coil
and
replace.
Note:
when
checking
coils
on
fan
starter(s)
(S2,
S3,
S4)
the
starter
interlock(s)
(AC2,
AC3,
AC4)
on
the
previous
starter
must
pull
in
and
the
fan
timer(s)
(TD6,
TD7,
TD8)
must
time
out
to
see
voltage
present
on
the
next
starter.
B3.
If
fan
#1
pulls
in,
check
load
side
of
interlock
(AC1)
for
presence
of
voltage
when
fan
switch
(SW2)
is
depressed.
If
voltage
is
present
at
load
side
of
interlock
(AC1)
check
opposite
side
of
interlock
(SW14).
If
no
power
is
present
the
interlock
(AC1)
is
defective,
replace.
Check
all
interlocks
on
other
fan
starter(s)
(S2,
S3,
S4)
in
sequence
to
find
defective
interlock
and
replace.
Note:
to
check
interlock(s)
(AC2,
AC3,
AC4)
on
other
fan
starter(s)
(S2,
S3,
S4)
starters
must
be
pulled
in.
B4.
If
fan
#1
pulls
in,
check
load
side
of
fan
timer
(TD6)
on
terminal
#2
(A1)
located
on
fan
timer
plug
‐
in
base.
If
voltage
is
present
(120
volts)
then
check
terminal
#3
located
on
fan
timer
(K13)
plug
‐
in
base,
remember
to
allow
the
timer
to
time
out
before
checking
voltage
on
terminal
#3,
if
voltage
is
not
present
the
fan
timer
(TD6)
is
defective,
replace.
Note:
to
check
other
timer(s)
(TD7,
TD8)
follow
the
same
procedure.
C1.
If
some
or
none
of
the
fan
proven
lights
stay
lit
check
to
see
if
the
fan(s)
are
rotating
in
the
correct
direction.
When
electrical
service
is
installed,
attention
must
be
paid
to
proper
phasing.
All
motors
have
been
phased
at
the
factory.
In
the
event
phases
are
reversed,
shutoff
power
on
main
breaker,
reverse
L1
and
L3
at
main
breaker.
(Wild
leg
must
be
on
L2)
C2.
If
voltage
is
present
on
terminal
#24
(120
volts)
then
check
for
voltage
on
terminal
#25
(120
volts)
while
the
fan(s)
are
locked
into
operation.
If
no
voltage
is
present
the
fan
air
sensor
(AS1)
is
defective,
replace.
If
voltage
is
present
on
terminal
#25
the
fan
proven
light
(LT13)
is
defective,
replace.
C3.
If
voltage
is
present
on
terminal
#25
(120
volts)
then
check
for
voltage
on
terminal
#26
(120
volts)
while
the
fan(s)
are
locked
60
Содержание DP
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