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6
1 Basic
F
unctions of the
S
ystem
1.1 Cooling Mode
1.1.1 Cooling conditions and process:
I
f the compressor is in stop status and the unit is started for cooling (when one of the indoor units reaches a cooling condition),
the unit starts
In this instance
, the electronic expansion valve, the outdoor fan and the compressor start operation.
1.1.2 Stop in cooling operation
1.1.2.1 Compressor stops
The compressor stops immediately
.
T
he outdoor fan stops after
1 minute.
1.1.2.2 Some of the indoor units reach the stop condition (the compressor does not stop)
.
The compressor operates immediately according to the required frequency. For the indoor unit with no requirement, the
corresponding electronic expansion valve is
closed
.
1.1.3 Cooling mode transfers to heating mode
When the unit transfers to heating mode, the 4-way valve is energized after the compressor stops for
2 minutes
. The other
functions
are the same as stopping in cooling mode.
1.1.4 4-way valve:
I
n this mode, the 4-way valve is
de-energized
.
1.1.5 Outdoor fan control in cooling mode
The outdoor fan starts before
5 seconds
of the starting of compressor. The outdoor fan will run in high speed for
3 minutes
after
starting and then it will run in
the
set speed. The fan
will
run at every speed for at least 80
s
econds
. (When the quantity
of running indoor unit
s
is changed, the unit will enter the control described in 1.3.5.1 and 1.3.5.2)
.
When the compressor stops, the outdoor fan runs at present speed and stops after 1
min
ute
.
1.2 Dry Mode
1.2.1 The dry conditions and process are the same as those in cooling mode
.
1.2.2 The status of 4-way valve:
De-engergized.
1.2.3 The temperature setting range:
60.8°F - 86°F (
16
°C
-
30
ć
)
.
1.2.4 Protection function:
T
he same as those in cooling mode
.
1.2.5 In dry mode, the maximum value A of the capacity requirement percentage
of
a
single unit is 90% of that in cooling
mode. The open condition of the electronic expansion valve, outdoor fan and compressor is the same as those in cooling
mode.
1.3 Heating Mode
1.3.1 Cooling conditions and process:
When one of the indoor units reaches the heating operation condition, the unit starts
the
heating operation.
1.3.2 Stop in heating operation:
1.3.2.1 When all the indoor units reach the stop condition, the compressor stops and the outdoor fan stops after 1
minute.
1.3.2.2 Some of the indoor units reach the stop condition
.
The compressor reduces the frequency immediately and operates according to the required frequency
.
1.3.2.3 Heating mode transfers to cooling mode
(dry mode), fan mode
.
a. The compressor stops
.
T
he power of 4-way valve is cut off after 2
min
.
T
he outdoor fan stops after 1
min
.
d.
T
he status of 4-way valve: energized
.
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