Kaysun KEM-30 DNH3, Техническое руководство

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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 EC, 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 (fault code EF)
14 Shell and tube low-temperature ant-freeze sensor (fault code Eb)
15
Water flow detection (fault code of the main unit E9) is only valid for the main unit but invalid for subordinate units.
1) Main unit: if abnormal water flow occurs , the main unit board and the wired controller will display fault code E9.
2) Subordinate unit: (water flow detection will not be done).
16 Power phase detection(fault code E8)
17 Electronic expansion valve of the system B
18
Electronic expansion valve of the system A
Electronic expansion valve is used to control refrigerant flow under different operating modes and different loads.
19
Auxiliary electric heater
Attention: the control port value of auxiliary electric heater actually detected is ON/OFF but not 220-230V control power
supply, so special attention should be paid when installing the auxiliary electric heater.
Attention!
Under heating mode, when the main unit board detects total water outlet temperature to be lower than 45 , the switch will
be closed, and the auxiliary electric heater will begin to work; when the total water outlet temperature is higher than 50 ,
the switch will be opened, and the auxiliary electric heater will stop working.
20
PUMP.
Attention: the control port value of the pump actually detected is ON/OFF but not 220-230V control power supply, so special
attention should be paid when installing the pump.
1) After receiving start-up instruction, the pump will be started up instantly, and will maintain start-up state always in the
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
ADDRESS
ADDRESS
When the address
is 1,2,3……F, it
serves as the
subordinate unit
1,2,3……15.
When the
address is 0, it
serves as the
main unit.