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Defrost
Control
"
Defrost
operation
is
controlled
by
timer
and
sensing
temperature
of
outdoor
pipe.
"
The
first
defrost
starts
only
when
the
outdoor
pipe
temperature
falls
below 21°F
after
60
minutes
passed
from
starting
of
heating operation
and
more
than
10
minutes
operation
of
compressor.
"
Defrost
ends
after
12
minutes
passed
from
starting
of
defrost
operation
or
when
the
outdoor
fan
operates
with-
in
4
minutes
after
the
outdoor pipe
temperature
rises
over
WF
even
if
before
12
minutes.
"
The
second
defrost
starts
only
when
the
outdoor
pipe
temperature
falls
below
21°F
after 60
minutes
passed
from
ending
of
the
first
defrost
and
more
than
10
minutes
operation
of
compressor.
OUTDOOR
PIPE
TEMP.
More
than
60
minutes
of
heating
operation
Within
12minutes
More
than
60
minutes
of
heating
operation
Defrost
More
than
10
min.
running
of
compressor
Defrost
More
than
10
min.
running
of
compressor
540F
(DEFROST OFF)
21°F
(DEFROST
ON)
Within
4
minute
HOT-
START
INDOOR
FAN
SPEED
ON
OFF
ON
OFF
COMPRESSOR
ON
ON
ON
ON
4-WAY
VALVE
ON
OFF
ON
OFF
OUTDOOR
FAN
ON
OFF
ON
OFF
-19-
"