35
LAYOUT OF PCB BOARDS
rif Code Description
1 CN21 Port for power supply
2 S3 Rotary Dip switch
3 DIS1 Digital display
4 CN5 Port for grounding
5 CN28 Port for variable speed pump power supply input
6 CN25 Port for IC programming
7 S1,S2,S4 Dip switch
8 CN4 Port for USB programming
9 CN8 Port for flow switch
10 CN6 Port for temperature sensors (T2,T2B,TW_out,TW_in, T1,)
11 CN24 Port for temperature sensor (Tbt1, inertial tank temperature probe)
12 CN16 Port for temperature sensor (Tbt2, additional DHW tank temp probe)
13 CN13 Port for temperature sensor (T5, DHW temp probe)
14 CN15 Port for temperature sensor (Tw2, only for 2 areas)
15 CN18 Port for temperature sensor (Tsolar, panel temp probe)
16 CN17 Port for variable speed pump communication
17 CN31
Control port for room thermostat (heating mode) (HT)/ Control port for room thermostat
(cooling mode) (CL) / Control port for room thermostat (COM)
18 CN35 Port for smart grid (grid signal, photovoltaic signal)
19 CN36 Port for remote switch, temperature board
20 CN19 Port for communication between indoor unit and outdoor unit
21 CN14 Port for communication with wired controller
22 CN30
Port for communication with wired controller, parallel indoor unit
Master-Slave connection
23 CN7
Port for antifreeze electric heating tape (internal), additional heat source, compressor/
defrosting operation
24 CN11
Control port for tank booster heater, internal backup heater 1, input port for solar energy, port
for room thermostat, SV1 (3-way valve), SV2 (3-way valve), SV3 (3-way valve), area 2 pump,
external circulator, solar energy pump, DHW pipe pump
25 CN2 Feedback port for outdoor temperature switch (shorted in default)
26 CN1 Feedback port for temperature switch (shorted in default)
27 CN22 Control port for backup heater 1/booster heater / reserved
28 CN41 Port for antifreeze electric heating tape
29 CN42 Port for antifreeze electric heating tape
30 CN29 Port for antifreeze electric heating tape
31 IC39 EEPROM
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