Control
Logics
For
4
‐
Pipe
System
D.5.
Note:
4
‐
pipe
system
must
always
be
equipped
with
2
valves.
COOL
MODE
a)
MTV2,
AUX1
and
Electrical
Heater
are
always
off.
b)
If
Tr
≥
Ts
+
1ºC
(or
+
4ºC
if
economy
contact
is
activated),
then
cool
operation
is
activated,
MTV1
and
AUX2
are
turned
on.
Indoor
fan
runs
at
set
speed.
c)
If
Tr
<
Ts,
then
cool
operation
is
terminated,
MTV1
and
AUX2
are
turned
off.
Indoor
fan
runs
at
set
speed.
d)
The
range
of
Ts
is
16
‐
30ºC
e)
Indoor
fan
speed
can
be
adjusted
to
low,
medium,
high
and
auto.
f)
When
turned
on,
MTV1
requires
30
seconds
before
it
is
fully
open.
g)
When
turned
off,
MTV1
requires
120
seconds
before
it
is
fully
closed.
h)
When
the
unit
is
turned
off,
the
indoor
fan
will
shut
down
after
5
seconds.
LOW
TEMPERATURE
PROTECTION
OF
INDOOR
COIL
a)
If
Ti1
≤
2ºC
for
2
minutes,
then
MTV1
and
AUX2
are
turned
off.
If
indoor
fan
is
set
for
low
speed,
then
it
will
run
at
medium
speed.
If
it
is
set
at
medium
or
high
speed,
then
it
will
keep
running
at
the
same
speed.
b)
If
Ti1
≥
5ºC
for
2
minutes,
then
MTV1
and
AUX2
are
turned
on.
Indoor
fan
runs
at
set
speed.
FAN
MODE
a)
Indoor
fan
runs
at
the
set
speed
while
heater,
MTV1,
MTV2,
AUX1
and
AUX2
are
turned
off.
b)
Indoor
fan
speed
can
be
adjusted
to
low,
medium
and
high.
HEAT
MODE
Without
Electrical
Heater
a)
MTV1,
AUX2
and
are
heater
always
off.
b)
If
Tr
≤
Ts
‐
1ºC
(or
‐
4ºC
if
economy
contact
is
activated),
then
heat
operation
is
activated,
MTV2
and
AUX1
are
turned
on.
Indoor
fan
runs
at
the
set
speed.
c)
If
Tr
>
Ts,
then
heat
operation
is
terminated,
MTV2
and
AUX1
are
turned
off.
Indoor
fan
repeatedly
runs
at
low
fan
speed
for
30
seconds
and
then
stops
for
3
minutes.
d)
The
range
of
Ts
is
16
‐
30ºC.
e)
Indoor
fan
speed
can
be
adjusted
to
low,
medium,
high
and
auto.
f)
When
turned
on,
MTV2
requires
30
seconds
before
it
is
fully
open.
g)
When
turned
off,
MTV2
requires
120
seconds
before
it
is
fully
closed.
With
Electrical
Heater
as
Booster
a)
MTV1
and
AUX2
are
always
off.
b)
If
Tr
≤
Ts
‐
1ºC
(or
‐
4ºC
if
economy
contact
is
activated),
then
heat
operation
is
activated,
MTV2
and
AUX1
are
turned
on.
Indoor
fan
runs
at
the
set
speed.
c)
If
Tr
>
Ts,
then
heat
operation
is
terminated,
MTV2
and
AUX1
are
turned
off.
Indoor
fan
repeatedly
runs
at
low
fan
speed
for
30
seconds
and
then
stops
for
3
minutes.
d)
If
Ti2
<
40ºC,
then
the
electrical
heater
is
turned
on.
If
40ºC
≤
Ti2
<
45ºC,
then
the
electrical
heater
maintains
its
original
state.
If
Ti2
≥
45ºC,
then
the
electrical
heater
is
turned
off.
e)
The
range
of
Ts
is
16
‐
30ºC
f)
Indoor
fan
speed
can
be
adjusted
to
low,
medium,
high
and
auto.
g)
When
turned
on,
MTV2
requires
30
seconds
before
it
is
fully
open.
h)
When
turned
off,
MTV2
requires
120
seconds
before
it
is
full
closed.
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