Technical documentation
Technical documentation
STZS ed. 06/03
29
ZEUS SUPERIOR
ZEUS Superior
OPERATION SEQUENCE
Central-heating mode
D.h.w. mode
POWER SUPPLY
POWER SUPPLY
Main switch in WINTER position
Main switch in SUMMER or WINTER position
⇓
⇓
MODULATION CARD AND C.A.R.
(
remote
control
)
POWER SUPPLY
MODULATION CARD AND C.A.R.
(
remote
control
)
POWER SUPPLY
When the main switch contacts close
(WINTER position)
the modulation board and C.A.R. (
if fitted
) are powered and
operation in central-heating mode is enabled
When the main switch contacts close
(SUMMER position)
the modulation board and C.A.R. (
if fitted
) are powered and
operation in d.h.w. is enabled
⇓
⇓
CLOSING OF ROOM THERMOSTAT SWITCH
/ CAR OPERATION REQUEST
DOMESTIC HOT WATER OPERATION
REQUEST
Room thermo. or CAR (
if fitted
) request detects conditions
that require operation in central-heating phase
Storage tank water temperature below that set
⇓
⇓
PUMP AND 3-WAY VALVE POWER SUPPLY
PUMP AND 3-WAY VALVE POWER SUPPLY
The modulation board powers the circulator and the electric
3-way valve
The valve is moved to central-heating position
The modulation board powers the circulator and the electric
3-way valve.
The valve is moved to d.h.w. position
⇓
⇓
CLOSING OF PUMP PRESSURE MICROSWITCH
The circulation of water inside the primary circuit causes the closing of the pump pressure
switch
⇓
FLUE PRESSURE SWITCH CONTACT CONTROL
The card checks the correct position of the flue pressure switch
(contact NC normally closed)
⇓
FAN POWER SUPPLY
The modulation board powers the fan
⇓
FLUE PRESSURE SWITCH CONTACT CONTROL
The modulation board checks the deviation of the flue pressure switch contact following fan
operation
(contact NO normally open)
⇓
IGNITION CONTROL UNIT POWER SUPPLY
The modulation board controls the ignition control unit
⇓
IGNITION ELECTRODES POWER SUPPLY
The ignition unit powers the ignition electrodes
⇓
GAS VALVE POWER SUPPLY
With the consensus of the overheating thermostat, the ignition unit powers the gas valve coils.
⇓
BURNER IGNITION
(SOFT)
For a few seconds, the board conveys soft-ignition power to the modulation coil
⇓
FLAME DETECTION
By means of the ionisation electrode, the ignition cardt detects burner ignition and conveys
the burner ignition signal to the modulation board
⇓
BOILER OPERATION
The burner operates at an output that varies according to the type of request, the
adjustments/settings made and the temperatures read by the NTC sensors
