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Technical Documentation
Zeus 24-28 kW function sequence.
Central heating mode
Power supply connected
Main switch on Winter
Integrated P.C.B. enabled
Contact closure on main switch (Winter) enables central
heating mode
Room thermostat/request switch closed
Remote Control function
A request from Room thermostat or the Remote Control
(when installed) detects the conditions requiring operation
in central heating mode
Pump and electric 3-way valve
Integrated P.C.B. powers the pump and the electric 3-way
valve; the valve is set to central heating mode
Integrated P.C.B. ensures flue pressure switch to be set to the correct position (contact normally closed NC)
Integrated P.C.B. verifies flue pressure switch contact status after the fan starts running (contact normally open NO)
Once the go-ahead is received from the safety thermostat, integrated P.C.B. powers the gas valve coils
Thanks to the ionization electrode, the integrated P.C.B. detects whether the burner has ignited
Burner functions at variable outputs depending on the request type, the carried out adjustments/settings and the tempera-
STZkW ed 10/07
Pressure switch contact control
Integrated P.C.B. powers the fan
Flue pressure switch contact control
Powered ignition electrodes
Integrated P.C.B. allows ignition electrodes operation
Powered gas valve coils
Burner ignition (automatic soft ignition)
Integrated P.C.B. sends soft ignition current to the modulation coil
Flame detection
Boiler operation
ture readings by NTC probes
Domestic hot water mode
Power supply connected
Main switch on Summer or Winter
Integrated P.C.B. enabled
Contact closure on main switch (Summer) enables DHW
Storage tank water temperature less than
Pump and electric 3-way valve
Integrated P.C.B. powers the pump and the electric 3-way
valve; the valve is set to DHW mode
Powered fan
31
Technical Documentation
mode
DHW request.
the set temperature
ZEUS kW Export
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