1
1
Overall information
1.1
Overall View
Fan
Safety
thermostat
Main heat
exchanger
Burner
Ignition
electrodes
Gas valve
Control
panel
Combustion
chamber
Automatic
air release
Pump
D.h.w. temp.
probe
D.h.w.
heat exchanger
Expansion
vessel
Detection
electrode
valve
Condensing
Diverter valve
Air pressure
switch
Main circuit
Flue thermostat
heat exchanger
Condensate
trap
flow switch
C.h. temp.
probe
1.2
Hydraulic diagram
Central heating (c.h.) operation
Domestic hot water (d.h.w.) operation
C.h.
water flow
C.h.
water return
D.h.w.
inlet
D.h.w.
outlet