DC INVERTER MULTI VRF CONTROL
46
Shown as the following figure:
3) Outdoor fan control
Definition of fan speed: Ultra-high fan speed: the upper and lower fans are both at high speed; High fan speed:
the upper and lower fans are both at medium speed; Medium fan speed: the upper and lower fan are both at low
speed; Low fan speed: the upper fan is at low speed, the lower fan stops; Stop fan speed: both the upper and lower
fans stop.
◆ Cooling Mode:
The fan could be switched among ultra-high - high - medium - low fan speed.
The compressor should be forced to run at high fan speed for 35 seconds before started. After the compressor
started, you should not stop it within 3 minutes, but you could regulate it up to ultra-high fan speed. The discharge
pressure should be measured 3 minutes later, and you can regulate the fans’ speed according to the following
discharge pressure:
Absolute pressure
value for discharge
（℃）
P≤30℃ 30℃＜P≤42℃ 42℃＜P≤49℃ P＞49℃
Cooling Shutdown the
fan forcibly
Turn down one
grade (not including
stopping
windshield )
Remain Turn up one
grade
For ultra-high fan speed, you couldn’t turn up the grade anymore;
◆ Heating Mode:
The fan should run at high fan speed for 35s before the compressor is started, meanwhile, it is not allowed to turn
up to ultra-high fan speed within the earlier 3 minutes after the compressor started, but it could be switched to low
speed and stopping fan. You could turn up to the highest level ultra-high fan speed after 3 minutes.
Pressure section:
Absolute pressure value
for discharge（℃）
P≤37℃ 37℃＜P＜48℃ P≥48℃
Heating Turn up one grade Remain Turn down one grade
4) Defrosting Function
◆ Defrosting Start Conditions
Keep heating (the four-way valve is under the heating position) for 50 minutes; when the intermediate sensor
temperature and outdoor ambient temperature retain the following curve figure for 120s,
Frequency Initialization pause point
Inverter controller
4-way Valve
Fan
Outdoor unit EXV
Indoor unit EXV 0- step
To the target frequency
Regulate according to
normal lo
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