T3
Increase fan speed increase
Keep current fan speed
Decrease fan speed
Fan stop
LowCoolT3_ON
LowCoolT3_Down
LowCoolT3_OFF
6.4.3.2 Heating mode
Normally the system will choose the running fan
speed according to ambient temperature:
Outdoor temperature℃
21
Breeze fan speed
19
18
Supper low fan speed
16
15
Low fan speed
13
12
Middle fan speed
10
0
High fan speed
-2
Supper high fan speed
6.4.4 Electronic Expansion Valve (EXV)
Control
1. EXV will be fully closed when the power is turned
on. Then the EXV will be on standby with 350P open
and will open to target angle after compressor starts.
2. EXV will close with -160P when compressor stops.
Then EXV will be standby with 350P open and will
open to target angle after compressor starts.
3. The action priority of the EXVs is A-B-C-D-E.
4. Compressor and outdoor fan start operation only
after EXV is initialized.
6.4.4.1 Cooling mode
The initial open angle of EXV is depends on indoor
model size, and the adjustment range is 100-400p.
When the unit starts to work for 3 minutes, the
outdoor will receive indoor units’ capacity demand
(T2B) information and calculate their average. After
comparing each indoor unit’s T2B with the average,
the outdoor will give the following modification
commands:
If the T2B ＞ average, the relevant valve needs
additional 16p to open;
If the T2B= average, the relevant valve’s open range
remains;
If the T2B ＜ average, the relevant valve needs
additional 16p to close.
This modification will be carried out every 2 minutes.
6.4.4.2 Heating mode
The initial open angle of EXV is depends on indoor
model size, and the adjustment range is 150-350p.
When the system starts to work for 3minutes, the
outdoor unit will receive indoor units’ capacity
demand (T2) information and calculate their average.
After comparing each indoor unit’s T2 with the
average, the outdoor unit gives the following
modification commands:
If the T2 ＞ average+2, the relevant valve needs
additional 16p to close;
If average+2≥the T2≥ average-2, the relevant
valve’s open range remains;
If the T2 ＜ average-2, the relevant valve needs
additional 16p to open.
This modification will be carried out every 2 minutes.
6.4.5 Four-way valve control
In heating mode, four-way valve is activated. In
defrosting, four-way valve operates according to the
defrosting action. In other modes, four-way valve is
deactivated. When switching from the heating mode
to other modes, the four-way valve will be
deactivated, after the compressor stays off for 2
minutes. In case of any failure or protection
activation (not including discharge temperature
protection or high and low pressure protection), four-
way valve immediately deactivates.
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