8.3.1 Main control board of indoor unit
1
CN21
32
CN32
CN29
31
30
CN42
29
CN40
28
CN41
CN22
27
CN1
26
25
CN2
1
2
13
Order
Port
Code
1
POWER
Port for power supply
CN21
2
Rotary dip switch
S3
/
3
DIS1
Digital display
/
4
Port for ground
CN5
GND
5
CN28
Port for variable speed pump power input
PUMP
6
CN25
DEBUG
Port for IC programming
Dip switch
/
7
S1,S2,S4,SW9
Port for USB programming
8
CN4
USB
9
Port for flow switch
CN8
FS
Port for temperature sensor of refrigerant liquid
T2
side temperature of indoor unit (heating mode)
Port for temperature sensor of refrigerant gas
T2B
side temperature of indoor unit (cooling mode)
Port for temperature sensor of inlet water
TW_in
10
CN6
temperature of plate heat exchanger
Port for temperature sensor of outlet water
TW_out
temperature of plate heat exchanger
Port for temperature sensor of final outlet
T1
water temperature of indoor unit
Port for upper temp. sensor of balance tank
11
CN24
Tbt1
Port for lower temp. sensor of balance tank
Tbt2
12
CN16
13
CN13
T5
Port for domestic hot water tank temp. sensor
14
Port for zone 2 temp.sensor of outlet water
CN15
Tw2
15
CN18
Tsolar
Port for solar panel temp. sensor
Port for variable speed pump communication
16
PUMP_BP
CN17
Control port for room thermostat (heating mode)
HT
17
CN31
COM
Power port for room thermostat
CL
Control port for room thermostat (cooling mode)
Port for smart grid (grid signal)
SG
CN35
18
Port for smart grid (photovoltaic signal)
EVU
2
3
4
5
CN5
CN28
CN25
DIS1
S3
3
5
6
8
9
4
7
14
15
16
17
18
19
20
CN11
24
Assembly unit
6
7
8
S1
S2
S4
CN4
10
25
26
27
11
12
21
22
23
24
29
30
31
CN7
23
Order
Port
Code
M1 M2
19
CN36
T1 T2
20
CN19
P Q
21
CN14
A B X Y E
1 2 3 4 5 Port for communication with the wired controller
22
CN30
6 7
9 10
26 30/31 32
23
CN7
25 29
27 28
1 2
3 4 15
5 6 16
7 8 17
9 21
10 22
24
CN11
11 23
12 24
13 16
14 17
18 19 20
25
CN2
TBH_FB
26
CN1
IBH1/2_FB
IBH1
27
CN22
IBH2
TBH
28
CN41
HEAT8
29
CN40
HEAT7
30
CN42
HEAT6
31
CN29
HEAT5
IBH0
32
CN32
24
9
10
CN24
CN8
CN6
CN16
CN13
CN15
CN18
CN31
CN35
CN36
SW9
CN17
28
1
2
3
4
5
32
6
7
8
9
10
CN30
22
Assembly unit
Port for remote switch
Port for temperature board
Communicate port between indoor unit and
outdoor unit
Port for communication with the wired controller
Communicate port between indoor unit and
outdoor unit
Port for Internal machine Parallel
Compressor run/Defrost run
Port for antifreeze E-heating tape(external)
Port for additional heat source
Input port for solar energy
Port for room thermostat
Port for SV1(3-way valve)
Port for SV2(3-way valve)
Port for zone 2 pump
Port for outside circulation pump
Port for solar energy pump
Port for DHW pipe pump
Control port for tank booster heater
Control port for internal backup heater 1
Port for SV3(3-way valve)
Feedback port for external temperature
switch(shorted in default)
Feedback port for temperature switch
(shorted in default)
Control port for internal backup heater 1
Reserved
Control port for tank booster heater
Port for anti-freeze electric heating tape(internal)
Port for anti-freeze electric heating tape(internal)
Port for anti-freeze electric heating tape(internal)
Port for anti-freeze electric heating tape(internal)
Port for backup heater
11
12
13
14
15
16
17
18
19
20
21