MCAC-ATSM-2014-09 R410a tropical air-cooled scroll chiller unit 60Hz
Control system 75
5
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.
Adjustment range of constant speed capability: ON and OFF.
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
Plate heat exchanger
’s frost-proof temp Unit outlet water temp Unit inlet-water tempe
Temp. of the condenser B
EEV opening A
EEV opening B
Operating current of system A
Operating current of system B
● 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);
1) Constant speed compressor: connection of discharge temperature switch and high-pressure switch of the system in
series.
2) Digital compressor: With dual-protection from Air Exhaust Temp. Switch and Air Exhaust Temp. Sensor. The Switch
tandem connects with the Hi-pressure switch in the system, while the Sensor enjoys an exclusive connector.
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
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
When the
address is 0, it
serves as the
main unit.
Summary of Contents for MGBT-D25W/DN1
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