A  Outdoor unit
B  Solar energy kit (field supply)
C  User interface
D  Room thermostat (field supply)
E  Boiler (field supply)
F  P_s: Solar pump (field supply)
G  P_c: Mixing pump (field supply)
H  P_o: Outside circulation pump
             (field supply)
I   P_d: DHW pump (field supply)
J   SV2: 2-way valve (field supply)
K  SV1: 3-way valve for domestic hot
     water tank (field supply)
L  Domestic hot water tank
M  Booster heater
N  Contactor 
O  Power supply
P  Backup heater
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