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8. Electric Control Functions
8.1 Control system
The control system adopts modular design, that is, all indoor units communicate with outdoor units, ref. to the
following figures for the control structure between indoor units and outdoor units. In the structure, the indoor control
board receives the information from users (for exam. set temp., fan speed etc.) and environment (ex, indoor coil
temp., indoor temp. etc.) ,and organize it to control the action of relevant parts, then transmits the signals to outdoor
control board through the following communication circuit. Outdoor control board can deal with the information
from indoor unit and figure out the best running mode, then transfer the instruction to indoor units to carry out it.
Indoor unit receive the user’s remote control signals.
Indoor unit Outdoor unit
T
2B
T1、T2、Ts T3、 T4、T3
Fan Speed Pressure switch
Pressure switch
4-way valve
Fan Fan motor
通讯 Co Compressor
Swing motor EXV
1、 T1 Indoor ambient temp.
2、 T2 Indoor evaporator middle part temp
3、 T
2B
Indoor evaporator outlet temp.
4、 Ts Indoor setting temp.
5、 T3 Outdoor heat-exchanger outlet temp.
6、 T4 Outdoor ambient temp.
8.2 Protection function
8.2.1 AC Volt Protection
a. Over-voltage protection
When AC voltage ≤ 260V for 30 seconds, Outdoor Unit resumes operation.
When AC voltage ≥ 270V for 30 seconds, Outdoor Unit stops operation and alarms.
Note: Voltage sampling precision is
±3%.
b. Lack-voltage protection
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