28
≤108°F, the indoor fan
will
r
un at low
speed
,
and
after one
minut
e,
the
i
ndoor fan
: if
T
tube
≤104°F and the indoor
fan
i
s at stop state,
the
indoor
fan
w
ill begin to run at low
b.
A°F≤T
c.
B°F≤T
<C°F, T
<C°F, T
<B°F, T
≥A°F, T
+36°F<T
+41°F, the unit will maintain its
+41°F, the compressor will stop, the outdoor fan will stop with a time lag of 30s, and the indoor fan will stop
+36°F, the unit enters heating mode, in which case the four-way valve, the compressor and the outdoor fan
Function and Control
Protection
Protection is the same as
that
und
e
r t
he
coolin
g
mode
.
(3) Heating Mode
W
orking conditions and process of heating
If
T
amb
.≤T
preset
will operate simultaneously, and the indoor fan will run at preset speed in the condition of preset cold air prevention.
If
T
a
mb.
≥T
preset
after 60-second blow at low speed
If
T
preset
a
mb.
<
T
preset
original operating status.
Under
this
m
ode, the
four
-way va
l
ve
is
ener
g
iz
ed and
temperature
can
b
e
s
et
withi
n a range
of
61 - 86°F
.
The
operating symbol, the heating symbol and preset temperature are revealed on the display
.
Condition and process of defrost
When duration of successive h
eatin
g ope
ration
is
mo
re than 45
minutes
,
o
r a
c
cumulated heating time
m
ore than 90
minutes
,
and one of the following conditions is reached, the unit will enter the defrost mode after 3 minutes.
a.
T
outdoor a
mb.
outdoor
tube
≤W°F
;
outd
oor
amb.
outdoor
tube
≤X°F
;
outdoor amb.
outdoor tu
be
≤Y°F
;
d.
T
outer
amb.
outer
tu
be
≤Z°F
At
that
ti
me, the indoor fan
stop
s
and
the
compressor
s
tops,
an
d
after
30
seconds
the
o
utdoor fan
will
s
top, and then
after
30
seconds,
the
four
-
w
ay valve
will
stop.
After
30 seconds,
the
compressor
i
s initiated for raising the frequency
t
o defrost
frequenc
y
.
When
the
c
ompressor has operated under
defrost
m
ode for 7.5
m
inutes,
o
r
T
outer tub
e
≥E°F, the compressor
will
b
e
c
onverte
d
to 53Hz
operation.
A
fter 30 seconds, the compressor will
stop
. And after
another
30 seconds, the
four
-way valve will be
opened, and after 60 seconds, the compressor and the outdoor fan
will
b
e started,
the
in door
f
an
will
run
under
preset
cold
air
prevention conditions,
and
H1
will
b
e displayed at
temperat
ure display area on the display panel.
Defrost
f
requency is
7
0H
z.
3
.
P
r
otection
Cold air prevention
The unit is started under heating mode (the compressor is ON):
In the case of
T
indoor
amb.
<75°F
speed with a
time
lag of 2
minutes.
Within
2
m
inutes, if
T
tu
be
>40 , the indoor fan also will run at low speed; and after
1-m
inute
operation
a
t
low
speed,
the
indoor
f
an
will
be
c
onve
rted
t
o
operatio
n
at
p
reset speed.
Within
1-minute
low
speed
operation or 2-minute non-operation, if
T
t
ube
>108°F , the fan will run at present speed.
I
n the
case
o
f
T
indoo
r
a
mb.
≥75°F :
if
T
t
ube
will
b
e converted
t
o
preset
speed.
With
in one-minute low speed operation,
i
f
T
tube
, the indoor fan
will
b
e converted
to
pre
set s
peed
.
N
ot
e:
T
ind
oor
amb.
1
2
refers to,
under
initiall
y
heati
ng mode, the
indoor
ambient
temperature
befo
re
the
command
to
start the
compressor
i
s performed according to the
pr
ogr
am
, or after the unit
is
withdrawn from defrost, the
indoor ambient temperature before the defrost symbol is cleared.
To
tal current up and f
re
quency down protection
If the total
current
I
total
≤W, frequency rise
will
b
e
allowed;
i
f
I
total
≥X, frequency
ris
e
will
not
b
e
allowed;
i
f
I
total
≥Y, the
compressor
will
run
at
r
educed frequency; and
if
I
total
≥Z,
the
com
pressor will stop and the outdoor fan will stop
with
a
time
lag of 30s.
(4) Fan Mode
Und
er
th
e
mode
, the indoor fan
will
run at preset
speed
and
t
he
compressor
, the outdoor
f
an,
t
he
four
-way valve
and
the
electric heater will stop.
Under the mode, temperature can b
e
set within a range of 61°F - 86°F.
(5)
AUT
O Mode
W
orking conditions and process of
AUT
O mode
Under
AUT
O mode, standard cooling temperature
T
preset
is 77°F and standard heating temperature
T
preset
is 64.4°F.
a.
O
nce
ener
gized,
if
T
amb
.≤68°F, the unit
will
b
e started
unde
r heating mode; if 68°F <
T
amb
.
<
7
7°F, the unit will run
under fan mode and the operation indicator lamp will be bright; and if
T
amb
.≥77°F, the unit will be started under cooling mode.
>108°F
