33
2.5 GENERAL SCHEME AND OPERATION PRINCIPLES
Heating circling mode (CH)
Domestic hot water circling (DHW)
PCB
Expansion vessel
Ex. vessel connec. pipe
Manometer
Hot water sensor
Circulation pump
Flow switch
Deaerator
GAS
Flow
CH
Exit
DHW
Three-way valve
AIR
INTAKE
SMOKE COMBUSTION
OUTLET
Combustion fan
Return sensor CH
Overheating switch
Gas valve
Exchanger DHW
Entrance
DHW
Return
CH
Water level sensor
Smoke ejector conduit
Igniter
Flame detector
First heat exchanger
Second heat exchanger
Return sensor CH
PCB
Condensate siphon
Power cable
Chronothermostat WiFi
Return filter CH
Vent valve
Filling tap
Filter DHW
Antifrost resist. DHW
Expansion vessel
Ex. vessel connec. pipe
Manometer
Hot water sensor
Circulation pump
Flow switch
Deaerator
GAS
Flow
CH
Exit
DHW
Three-way valve
AIR
INTAKE
SMOKE COMBUSTION
OUTLET
Combustion fan
Return sensor CH
Overheating switch
Gas valve
Exchanger DHW
Entrance
DHW
Return
CH
Water level sensor
Smoke ejector conduit
Igniter
Flame detector
First heat exchanger
Second heat exchanger
Return sensor CH
PCB
Condensate siphon
Power cable
Chronothermostat WiFi
Return filter CH
Vent valve
Filling tap
Filter DHW
Antifrost resist. DHW