Kaysun KRE-1000D1, Инструкция по установке и эксплуатации, Страница: 11 / 20

7
Table 4-3 Code and Definitions
Operation lamp Flashing
times
Show on central-
ized controller
Explanation
● / / Unit is ON
○ / / Unit is OFF
★
E2 Indoor temperature sensor
error
★
4 E5(new protocol)
EF(old protocol)
Outdoor temperature sensor
error
★
6 E7 EEPROM error
★
8 E6 DC fan motor error
★
10 OFF LINE Without address
★
12 E1 Communication error with
ODU
★
14 Ip address Conflict
★
16 EU error with sensor board
★
18 FC error with CO2 sensor
E9 wire controller communica-
tion failure
Ed Outdoor unit failure
NOTE: ●:Light ; ○:Extinguish ;
★
:Quick flash
Table 4-4 Terminal Definition
CODE CN8 CN9 CN32 CN33 CN7 CN3 CN4 CN21
NAME P Q E X Y E Modbus RTU D1D2E X1X2 Indoor temp. Sensor Outdoor temp. Sensor PRO
Dry contact
(In put)
CN31 Inlet air pre-heat Signal
CN16 Force to exhaust air mode
CN26 Remote ON/OFF
Dry contact
(Out put)
CN14 Signal for ventilation fan
CN15 Alarm
CN20 Signal for inlet air Pre-heat
Communication wiring between the indoor and outdoor units
The KRE and outdoor units communicate via the RS485 serial port.
The communication wiring between the KRE and outdoor units should be connected one unit after another in a daisy chain from the out-
door unit to the final KRE unit. And the shielded layer must be properly grounded, and a build-out resistor must be added to the last KRE
unit to enhance the stability of the communication system.
Incorrect wiring such as a star connection or a closed ring will cause instability of the communication system and system control anoma-
lies.
Use a three core shielded wire (greater than or equal to 0.75 mm
2
) for the communication wiring between the indoor and outdoor units.
Make sure the wiring is connected correctly. The connecting lead for this communication wire must come from the master outdoor unit.
All shielded wiring in the network are interconnected, and will eventually connect to earth at the same point “ ”.
P
Q
Outdoor
unit
(Connect the shielded end of the shielded wire to
the electronic controller box sheet metal "
" here)
Signalling line be-
tween outdoor units
Connecting the shielded
layer of the shielded wire
Only the last indoor unit requires add-
ing the build-out resistor at P and Q.
(open)
Indoor and out-
door units Com-
munication wire
Build-out resistor
(P Q E)
(P Q E)