6
6. APPeNdIX
6.1 Connection of PCB illustration
6.2 Connections explanation
CHILLER 300
240 V
AC 50Hz.
12 VDC
Wire No. Port No.
Symbol
Meaning
11
HEAT
Auxillary heater output (220VAC)
10
PUMP
Demand pump ouput (220VAC)
9
FAN
Fan motor output (220VAC)
8
VAL2
4way valve of system2 (220VAC)
7
VAL1
4way valve of system1 (220VAC)
6
COMP2
Compressor of system2 (220VAC)
5
COMP1
Compressor of system1 (220VAC)
4
AC-L
Active power supply
1,2,3
AC-N
Neutral wire
21
12
KYOUT GND
On/Off switch (output) (not used)
22
13
MDOUT GND
Mode output (not used)
26,27,28 14,15,16
NET GND 12V
Wire controller
18
18
KYIN
On/Off Switch (input)(not used)
19
19
MDIN
Model (input) (not used)
16,17
21,22
WATER GND
Flow switch (input)( normal close)
24,25
23,24
FROST GND
Defrost signal (not used)
29,30,31 25,26,27
SYS GND 12V
System protection (input)(normal close)
32
ROOMT
Ambient temp. (input)
31
PIPE2
Temp. Of fan coil2 (input) (not used)
30
PIPE1
Temp. Of fan coil 1 (input) (not used for split type)
29
OUTWT
Water out temp. (input)
28
INTWT
Water in temp. (input)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
WIRE NO.
WIRE COLOUR
