22
STNM ed 07/07
NIKE Mini Export
Technical Documentation
Technical Documentation
Loads.
This board is always powered regardless of the position of the functioning button (S2)
(see integrated board operation)
.
Integrated board
It is powered by the integrated board when there’s a d.h.w., central heating or antifreeze
request.
It permits circulation in the primary circuit.
Boiler circulator
(M1)
It is controlled by the integrated board that produces an electrical charge between its end
and the burner surface, igniting the air-gas mixture when they come into contact.
Ignition electrode
(E1)
Low voltage circuit.
This device is used to remotely control the boiler
(SUMMER/WIN-
TER selection, setting and indicating temperatures, displaying alarms,
resetting, etc.)
and acts as a weekly timer/room thermostat.
If the CRD is installed the existing X40 jumper has to be re-
moved.
Remote digital control
(CRD)
(optional)
See Remote
digital control
operation
(CRD)
After some d.h.w. has been drawn this switch acts on the integrated
board provoking operation in the domestic hot water mode.
When idle it enables operation in the central heating mode.
D.h.w. flow switch
(S4)
(for combi versions only)
Interrupted
contact
Control and safety devices.
It resets the boiler subsequent to the triggering of the ignition
failure safety device, the overtemperature safety device, electrome-
chanical contacts failure or a parasite flame and is used to start the
chimneysweep function.
If pressed together with the functioning button (S2) it lets you
access the boiler parameter settings.
Reset push button
(S3)
Push Button
With this valve the flow of primary circuit water can be diverted from the central heating
system to the d.h.w. plate exchanger and vice versa.
It is powered by the integrated board.
3-way valve
(M30)
(for combi versions only)
Gas valve (Y1)
(main coils)
It is powered by the integrated board when the burner is to be ignited.
In SIT 845 gas valve, it is powered by the electric main tension.
In VK 4105 gas valve, it is powered by electric main tension rectified by a diode bridge
(U1) located inside the connector of the gas valve.
It allows gas flow to the burner.
