Installation and Maintenance
Service Manual
temperature can be set at: 25~30ºC (Cooling at low temperature),
that is, the minimum setting temperature for outer units judgment
is 25ºC .
(2) Dehumidifying Mode
1. Conditions and processes of dehumidifying operations: Same
as the cooling mode;
2. The temperature setting range is: 16~30ºC ;
(3) Air-supplying Mode
1. The compressor, outdoor fans and four-way valves are switched
off;
2. The temperature setting range is: 16~30ºC.
(4) Heating Mode
1. Conditions and processes of heating operations: (Tindoor
ambient temperature is the actual detection temperature of indoor
environment thermo-bulb, Theating indoor ambient temperature
compensation is the indoor ambient temperature compensation
during heating operations)
(1) If the compressor is shut down, and [(T
indoor ambient temperature
–
⊿
T
heating indoor ambient temperature compensation
) –T
setup
] ≤ 0.5 , start the
machine to enter into heating operations for heating;
(2) During operations of heating, if 0ºC ≤ [(T
indoor ambient temperature
–
⊿
T
heating indoor ambient temperature compensation
) –T
setup
] < 2 , the heating
operation will be still running;
(3) During operations of heating, if 2ºC ≤ [(T
indoor ambient temperature
–
⊿
T
heating indoor ambient temperature compensation
) –T
setup
], the heating
operation will stop after reaching the temperature point.
2. The temperature setting range in this mode is: 16~30ºC .
3. Special Functions
Defrosting Control
①
Conditions for starting defrosting
After the time for defrosting is judged to be satisfied, if the
temperature for defrosting is satisfied after detections for
continuous 3minutes, the defrosting operation will start.
②
Conditions of nishing defrosting
The defrosting operation can exit when any of the conditions
below is satised:
③
T
outdoor pipe temperature
≥ (T
outdoor ambient temperature
– [T
temperature 1 of
nishing defrosting
];
④
The continuous running time of defrosting reaches [tmax.
defrosting time].
4. Control Logic
(1) Compressor Control
Start the compressor after starting cooling, heating, dehumidifying
operations, and the outer fans start for 5s; When the machine is
shutdown, in safety stops and when switching to air-supplying
mode, the compressor will stop immediately. In all modes: once
the compressor starts up, it will not be allowed to stop until having
run for the [tmin. compressor running time] (Note: including cases
of shutdown when the temperature point is reached; except the
cases requiring stopping the compressor such as fault protection,
remote shutdown, mode switching etc.); In all modes: once the
compressor stops, it will be allowed be restart after 3-minute delay
(Note:
The
indoor
units
have
a
function
of
power
memory,
the
machine can be restarted after remote shutdown and powering up
again without delay).
1. Cooling mode
Start
the
machine
to
enter
into
cooling
operation
for
cooling,
the
compressor is switched on.
2. Dehumidifying mode
Same as the cooling mode.
3. Air-supplying mode
The compressor is switched off.
4. Heating mode
(1) Start the machine to enter into heating operation for heating,
the compressor is switched on.
(2) Defrosting:
a. Defrosting starts: the compressor is shut down, and restarts it
after 55-second delay.
b.
Defrosting
ends:
the
compressor
stops,
then
starts
it
after
55-second delay.
(2) Outer Fans Control
Notes:
Only the outer fans run for at least 80s in each air ow speed can
the air ow be switched;
After the outer fans run compulsively in high speed for 80s when
the machine starts up, control the air ow according to the logic.
After
remote
shutdown,
safety
stops,
and
when
the
machine
stops
after
reaching
the
temperature
point,
as
well
as
after
the
compressor
stops,
extend
1
minute,
the
outer
fans
will
stop
(During the period in the 1 minute, the air ow of outer fans can be
changed according to the outdoor ambient temperature changes);
When running with force, the outdoor fans shall run in the highest
air ow.
(3) 4-way valve control
1.
The
4-wa y
valve
control
under
the
modes
of
Cooling,
dehumidication and supplying air: closing;
2.
The
status
of
4-way
valve
control
under
the
heating
mode:
getting power;
(1) 4-way valve power control under heating mode
a.
Starts
the
machine
under
heating
mode,
the
4-way
valve
will
get power immediately.
(2) 4-way valve power turn-off control under heating mode
a.
When
you
should
turn
off
the
power
or
switch
to
other
mode
under heating mode, the power of 4-way valve will be cut after 2
minutes of the compressor stopped.
b. When all kinds of protection stops, the power of 4-way valve will
be cut after delaying 4 minutes.
(3) Defrosting control under heating mode:
a.
Defrosting
begins:
The
power
of
4-way
valve
will
be
cut
after
50s of entering into the defrosting
compressor.
b.
Defrosting
stops:
The
4-way
valve
will
get
power
after
50s
of
exiting the defrosting compressor.
(4) Evaporator frozen-preventing protection function
At the mode of Cooling, dehumidifying:
21
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