Midea MCCDH30A-TA3SL, Техническое и сервисное руководство

Страница: 126 / 169

Air-cooled modular chiller unit
6
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 water
temperature. Adjustment range: Load, stabilize, unload, Emergency Stop.
7
Spot check. The operating status of outdoor system can be observed through spot check, and specific display contents are
as shown in the following figure:
Normal display
Operating mode Operating capability of the compressor B Number of online units Outdoor ambient temp. Temp. of the condenser A
T61 frost-proof temp Unit outlet water temp Unit outlet-water tempe Temp. of the condenser B
EXV opening A EXV opening B Operating current of system A Operating current of system B
The last failure
● Display contents of “operating mode”: 1. cooling; 2. heating; 4. pump; 8. Stand-by
● Display contents of “number of online units”: the main unit can display the number of online units, and the subordinate
unit displays 0.
8
Selection code of the compressor
9
10
COM (O) 485 communication port (Fault code E2).
11
COM (I) 485 communication port (Fault code E2).
COM (O) is interconnected with P, Q and E of COM (I), used for RS-485 communication.
1) If faults occur between the wired controller and the main unit module, all modules will be shut down.
2) If faults occur between the main unit and subordinate units, the subordinate unit module suffering communication fault
will be shut down. Less units will be detected by the wired controller, which may display EA, and in the meanwhile, the
indicator lamp of the wired controller will flash.
Restart 3 minutes later after malfunction be removed.
12
High-pressure protection of the system A and discharge temperature switch protection (Protection code P0).
High-pressure protection of the system B and discharge temperature switch protection (Protection code P2).
Low-pressure protection of the system A (Protection code P1).
Low-pressure protection of the system B (Protection code P3).
Constant speed compressor: connection of discharge temperature switch and high-pressure switch of the system in series.
13
Inlet water temperature sensor T62 (TBH2) (Fault code EF).
14
Shell and tube low-temperature ant-freeze sensor T61 (TBH1) (Fault code Eb).
Reserved DIP switch state
The diagram denotes selection of
constant speed compressor
Each modular part of modular unit has the same electric
control function, and the main unit and subordinate units
can be set through address code on the electric control
board. The address code 0 # is provided as the main unit.
The priority of being the main unit is given to the unit with
digital compressor, and other addresses are subordinate
units. Only the unit is chosen as the main unit, its electric
control can activate such functions as direct
communication with the wired controller, refrigerating and
heating capability adjustment, pump control, auxiliary
electric heater control, total effluent temperature detection
and water flow switch detection.
When the address is 0,
it serves as the main
unit.
When the address is
1,2,3……F, it serves as
the subordinate unit
1,2,3……15.
8
9
A
B
C
D
E
F
8 7
6
5
4
3
2
1
0
0 1
2
3
4
5
6
7
8
F
E
D
C
B
A
9 8
ADDRRSS