Midea MC-SU30-RN1L Owners & Installation Manual page 19

5.6 Detail description for parts in fig. 5-4
Table 5-2
No.
I1：Detection of current of the compressor A (protection code P4)
1
I2：Detection of current of the compressor B (protection code P5)
2 Outdoor fan , controlled by T4
One compressor of the system
3
4 Electronic expansion valve of the system
5
signal communication port (fault code E2)
T4: outdoor ambient temperature sensor (fault code E7)
T3 ：pipe temperature sensor of the condenser (fault code E5 and protection code P7)
1)T4: if there is one system that requires starting outdoor fans, the fans are started through electric control of
the unit. Start outdoor fan A only, start A and B gears, and control the unit through T4.
2)T3: when the electric control of the Modular unit detects the temperature of the outdoor pipe T3 of the system
6
exceeds the protective temperature 65℃ the corresponding system will be shut down. And it will be re-started
up, after the temperature drops below the recovery temperature 60℃. Another system will be not affected.
3)T4, T3: when the temperature sensor is detected to suffer open circuit or short circuit, fault alarm will occur. When
the main unit suffer fault of temperature sensor: the main unit and subordinate units will be shut down.When the
subordinate unit suffer fault of temperature sensor: the unit will be shut down, but other subordinate units will not
be affected.
Taf1: Shell and tube low-temperature ant-freeze sensor1 (fault code 1 Eb)
TZ/7: Total cooling temperature test port
7
TP2:Compressor exhaust temperature detecting port of the systemB
TP1:Compressor exhaust temperature detecting port of the systemA
Th:Compressor back gas temperature detecting port
Taf2: Shell and tube low-temperature ant-freeze sensor 2 (fault code 2 Eb)
Two: Unit outlet water temperature sensor (fault code E4)
Under refrigeration mode and heating mode, conduct adjustment according to the magnitude of unit outlet water
temperature.
8
Adjustment range of constant speed capability: ON and OFF.
Twi: Inlet water temperature sensor (fault code EF)
Tw: Total outlet water temperature sensor (fault code E3)
Only the main unit is valid, and the subordinate units are invalid.
Under refrigerating mode and heating mode, conduct adjustment according to the magnitude of total outlet
watertemperature. Adjustment range: Load, stabilize, unload, Emergency Stop.
9
Low pressure sensor
Module temperature test port
10
Module temperature is higher than 82℃ when shutdown protection PL
I1：Detection of current of the compressor A (protection code P4)
11
I2：Detection of current of the compressor B (protection code P5)
12
Low voltage protection switch
13
high-pressure protection and discharge temperature switch protection (protection code P0)
Detail information
I&O manual
15