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3.12 DESCRIPTION OF MAIN
FUNCTIONS.
Three-way valves/anti-block pumps.
The device is supplied with a function that
makes the pumps start (according to the model
installed) at least 1 once every 24 hours in order
to reduce the risk of pump blocking due to pro-
longed inactivity. In the case of the H-LT and
H-2LT versions, the same function also acts on
the mixing valve in order to prevent and avoid
the risk of blocking due to prolonged inactivity.
Post-circulation.
System post-circulation can be performed, con-
trolled by the boiler, in the system zone selected
as the main zone (see installation layout).
Summer DHW/functioning priority.
In the case of DHW or boiler functioning pri-
ority in Summer mode, all active pumps are
deactivated and any mixing valves are closed
(only for L-HT and H-2LT versions). Normal
functioning of the DIM re-starts at the end of
the DHW phase, taking the boiler switch to the
Winter position.
Mixing valve initialisation.
(Only for DIM H-LT and H-2LT).
Every time that the the appliance is powered,
initialisation of the mixing valves is carried
out, closing them for three minutes. This way,
synchronisation is performed between the P.C.B.
and the mixing valve. The transfer of heat energy
to the Low-Temperature zone can only take place
at the end of this initialisation phase.
Anti-freeze.
(Only for DIM H-LT and H-2LT).
The P.C.B. is supplied with a function that pro-
tects the Low-temperature system if the system
water drops below 5°C.
Zone management P.C.B.
3.13 ZONE MANAGEMENT P.C.B.
The zone control unit can be configured using
the selector switches on the unit (14 Fig. 3-18),
via which you can choose between the following
options:
n°
OFF
Homogeneous
Mixed zone
1
zone control
control
N° 1 mixed zone
N° 2 mixed zones
2
(Z2)
(Z2 and Z3)
3 Master board
Slave board
Main zone =
Main zone =
4
zone 1
zone 2
Super CAR: main
Super CAR: sys-
5
zone flow control
tem flow control
Mixed zones max.
Mixed zones max.
6
temperature =
temperature =
50°C
75°C
Normal func-
Multi-zone recog-
7
tioning
nition state
8 Not used
Not used
Mixed zones min-
Mixed zones min-
9
imum tempera-
imum tempera-
ture = 25°C
ture = 35°C
- S26 (5) can only be modified if the Super
C.A.R. remote control can be coupled with the
Superior kW range boilers.
- S26 (6) in the event of the setting with max.
flow temperature of 75°C, the relative safety
thermostat must be replaced with one suitable
for supporting this temperature.
Warnings. Various LEDs are present on the
board to display the functioning status and to
indicate any anomalies.
The LEDs from 1 to 7 (13 Fig. 3-18) identify the
activation of the relative relay:
- LED H1 zone 1 activation (high temperature)
- LED H2 zone 2 activation (low temperature)
- LED H3 zone 3 activation (optional)
- LED H4 mixer opening zone 2 L.T.
Key:
28
- LED H5 mixer opening zone 2 L.T.
- LED H6 mixer opening zone 3 (optional)
- LED H7 mixer closing zone 3 (optional)
The LED H11 signals that the zone management
board is powered.
LEDs 8 and 9 indicate the functioning status of
ON
the board:
Warning
CH request presence
Disabling of active
zones
Zone 2 safety ther-
mostat intervention
Zone 2 L.T. probe
fault
Zone 3 safety ther-
mostat intervention
Zone 3 L.T. probe
fault
Bus IMG anomaly
IMG communication
present
Intervention of
safety thermostat
B.T. DIM
Key:
ON = ON
OFF = OFF
ON L = Slow flashing (0.6 s on, 0.6 s off)
ON V = Fast flashing (0.3 s on, 0.3 s off)
ON F = Flash flashing (0.2 s on, 1 s off)
ON A = Alternate flashing
13 - Relay functioning signal LED (H1 ÷ H7)
14 - Zone management board functioning mode selectors
15 - Zone 3 low flow temperature regulation trimmer.
16 - Zone 2 low flow temperature regulation trimmer.
17 - Board functioning status signal LED
18 - Board functioning status signal LED
19 - Board functioning status signal LED
20 - Board power supply signal LED
H8
H9
H10
ON
OFF
OFF
ON L
OFF
OFF
OFF
ON
OFF
OFF
ON L
OFF
OFF
OFF
ON
OFF
OFF
ON L
OFF
ON A ON A
OFF
OFF
ON F
OFF
ON V
OFF
3-18
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