Electrical Diagram - Baxi MK SYSTEM Installation, User And Service Manual

4.4

Electrical diagram

Fig.4
H M
I
CB-05
1 2 3 4 5 6 7 8 9 10 11 12 13 1415
OUTPUT
S-BUS
ON
OFF
~
L N
230 ~ 50Hz
Product
power supply
OUTSIDE
Tab.3
Description
Backup
BL1 Multifunction
BL2 Multifunction
CB-05
CB-21
CH/DWH
Condensate sensor
Tdhw (Domestic hot water tempera­
ture)
EHC-14
GTW-30
HMI
ON/OFF
Outdoor Unit
T out (Outdoor temperature sensor)
OT boiler
OUTPUT
OUTSIDE
7856310 - v02 - 21122023
CH/DWH
L1 L2 N
ZONE
L N
Backup
L N
Description
Backup: heating element, backup boiler or district heating network
BL1 multifunction input
BL2 multifunction input
CB-05 PCB for managing the cascade installation
CB-21 PCB: interface between the EHC-14 PCB and an external L-BUS connection
Heating/Domestic Hot Water - Diverter valve
Terminal block for the condensation sensor
Terminal block for the domestic hot water temperature sensor
Main PCB for the heat pump
Optional unit for remote services and diagnostics
User interface
On/Off - On/Off switch
Outdoor unit
Terminal block for the outdoor temperature sensor
OpenTherm boiler
OUTLET - External power supply option
OUTDOOR - Components outside the indoor unit
X30
X23
X22
X19 X5 X4
X16
X13
X17
X31
EHC
X7
X11
X8
X20
X3
X21
X9
X6 X20 X10
16 17 18 19 20 21 22 23 24 25 26 27 28 29
+
GND -
E X Y
Config. out
GND B A
OT
boiler
Outdoor
24V | LIN | GND
unit
4 Technical specifications
X1
X2
X24
X26
X25
X15 X27
T System
sensor
PWM | GND
Room unit
X1
X2
CB-21
GTW-30
Outdoor
temp.
sensor
9