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