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SEQUENCE
OF
OPERATIONS
A.
CONTINUOUS
FAN
Thermostat
closes
R
to
G.
G
energizes
fan
relay on
PCB
(FSM4P,
FSU4P)
or
sends
signal
direct
to
motor
(FEM4P),
which
completes
circuit
to
indoor
blower
motor.
When
G
is
de-energized,
there
is
a
90
second
off
delay
before
relay
opens.
B.
COOLING
MODE
Thermostat
energizes
R
to
G, R
to
Y,
and
R
to
O (heat
pump
only).
G
energizes
fan
relay
on
PCB
(FSM4P,
FSU4P)
or
sends
signal
direct
to
motor
(FEM4P),
which
completes
circuit
to
indoor
blower
motor.
When
G
is
de-energized,
there
is
a
90
second
off
delay
before
fan
relay
opens.
C.
HEAT
PUMP
HEATING
MODE
Thermostat
energizes
R
to
G
and
R
to Y.
G
energizes
fan
relay on
PCB
(FSM4P,
FSU4P)
or
sends
signal
direct
to
motor
(FEM4P),
which
completes
circuit
to
indoor
blower
START-UP
PROCEDURE
motor.
When
G
is
de-energized,
there
is
a
90
second
off
delay
before
fan
relay
opens.
D.
HEAT
PUMP
HEATING
WITH
AUXILIARY
ELECTRIC
HEAT
Thermostat
energizes
R
to
G,
R
to
Y,
and
RtoW.
G
energizes
fan
relay
on
PCB
which
completes
circuit
to
indoor
blower
motor.
W
energizes
electric
heat
relay(s)
which
completes
circuit
to
heater
element(s).
When
W
is
de-energized,
electric
heat
relay(s)
open,
turning
off
heater
elements.
When
G
is
de-energized
there
is
a
90
second
off
delay
before
fan
relay
opens.
E.
ELECTRIC
HEAT
OR
EMERGENCY
HEAT
MODE
Thermostat
closes
R
to
W.
W
energizes
electric
heat
relay(s)
which
completes
circuit
to
heater
element(s).
Blower
motor
is
energized
through
normally
closed
contacts
on
fan
relay.
When
W
is
de-energized,
electric
heat
relay(s)
opens.
Refer
to
outdoor
unit
Installation
Instructions
for
system
start-up
instructions
and
refrigerant
charging
method
details.
CARE
AND
MAINTENANCE
The
system
should
be
regularly
inspected
by
a
qualified
service technician.
Consult
the
servicing
dealer
for
recommended
frequency.
Between
visits,
the
only
consumer
service
recommended
or
required
is
air
filter
maintenance
and
condensate
drain
operation.
Air
Filter
Inspect
air
filters
at
least
monthly
and
replace
or
clean
as
required.
Disposable
type
filters
should
be
replaced.
Reusable
type
filters
may
be
cleaned
by
soaking
in
mild
detergent
and
rinsing
with
cold
water.
Install
filters
with
the
arrows
on
the
side
pointing
in
the
direction
of
air
flow.
Condensate
Drain
During
the
cooling
season
check
at
least
monthly
for
free
flow
of
drainage
and
clean
if
necessary.
A
CAUTION
PRODUCT
DAMAGE
HAZARD
Failure
to
follow
this
caution
may
result
in
poor
unit
performance
and/or
product
damage.
Never
operate
unit
without
a
filter.
Factory
autho-
rized
filter
kits
must
be
used
when
locating
the
fil-
ter
inside
the
unit.
For
those
applications
where
access
to
an
internal
filter
is
impractical,
a
field-
supplied
filter
must
be
installed
in
the
return
duct
system.
18
496
01
5501
01
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