Immergas MINI NIKE 3 E - Page 28

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STMiN3E ed 09/11 MINI NIKE 3 E
Technical DocumentationTechnical Documentation
Low voltage circuit
Inputs
It sends the board a signal that allows to activate the stand-by status, the functioning in
Summer mode ( ) or Winter mode ( ) or to turn o the boiler.
Stand-by/Summer/
Winter/O button
(S2)
It sends the P.C.B. a signal that allows to release the integrated P.C.B. after the intervention
of an anomaly or boiler block, signalled with the relative error code.
Reset block key
(S3)
It is a resistance variable in an inversely proportionally manner to the
temperature of the water. It is positioned at the outlet of the main
exchanger, allowing the integrated P.C.B. to detect the temperature
of the ow water in the primary circuit.
Its breakage (signalled by relative anomaly) blocks burner functioning
both in central heating and domestic hot water modes.
It is also used as a ow limit thermostat (90 °C).
Flow probe
(B1)
NTC probe
10 kΩ 25 °C
is resistance is variable in a way that is inversely proportional to
the temperature of the water; it is positioned on the DHW outlet
pipe, allowing the integrated P.C.B. to read its temperature.
Its breakage (signalled by relative anomaly) nevertheless allows the
boiler to continue working in the central heating and DHW mode.
N.B.: for the MINI X 24 it is inserted into a bulb-holder in contact
with the external wall of the storage tank.
Domestic hot water
probe
(B2)
NTC probe
10 kΩ 25 °C
Detects the external temperature and allows the integrated P.C.B. to
vary the ow temperature depending on the external temperature.
It is a resistance that can be varied proportionally to the external
temperature.
External probe
(B4) (optional)
PTC probe
1 kΩ 25 °C
When the pressure of the boiler circuit is below 0.3 bar it determines
burner switch-o.
System pressure switch
(S5)
Open =
No pressure
Closed =
Pressure OK
Following the use of DHW, the closure of the contact acts on the
integrated P.C.B. causing it to operate in DHW mode.
In stand-by it enables functioning in CH mode.
Domestic hot water ow
switch
(S4)
(on instant version only)
Contact in
cut-o
It enables functioning in CH mode when the room temperature is
below that requested.
If the CAR
V2
is installed, the room thermostat must be disconnected
without restoring the pre-existing jumper X40.
Room thermostat (S20)
(optional)
Open = Central
heating OFF
Closed = Central
heating ON
If there is only little ue draught, act on the integrated P.C.B.
blocking boiler functioning for 30 minutes.
It is positioned on the right side of the ue hood.
Flue safety thermostat
(E6)
Klixon thermostat
with normally
closed contact