60T - 280T
13 - INSTALLATION - Electrical connections
1.0
1.5
2
3
4
5
6
7
8
9
10
OFF
ON
Figure 13-3 - 0-10 Vdc analogue input operating rules
COSMOGAS
39
13.1.5 - 885 IF board connection (on
request)
The 885 IF board is supplied on request for all models (see
part “13” in figures 3-3, 3-5 and 3-7).
The board allows:
1.- the appliances to be controlled via 0-10Vdc analogue
signal;
2.- the appliances to be controlled via MODBUS communication
digital signal;
3.- up to 8 appliances to be connected in cascade (see section
13.4)
0-10 Vdc type dialogue (on request)
The 885 IF board allows the appliance to be controlled via
0-10 Vdc dialogue, proceeding as follows:
1.- Install the board as per the instructions provided;
2.- Access the “installer menu” as described in section 16.15
and set the parameter
2003
= 4.
3.- The appliance can now be controlled via 0-10 Vdc signal
according to the rules in figure 13-3;
MODBUS type dialogue (on request)
The 885 IF board allows the appliance to be controlled
via MODBUS dialogue, proceeding as described on the
instructions provided on request.
13.1.6 - Alarm contact
Alarm contact works only in presence of the 885 IF board
(see figures 3-3, 3-5, 3-7 item “13”). Alarm contact does not
react in case a dependent module (burner 2, 3 or 4) is in error.
Maximum
supply
temperature
(Par.3017)
Minimum
supply
temperature
(Par.3018)
ON/OFF
hysteresis
Voltage
13.2 - Connecting boiler
to the storage tank
In order to generate domestic hot water, the boiler must
be connected to a storage tank.
The hydraulic connection must be done as per figure 10-2
or the like.
For the electrical connection, proceed as follows (refer to
figures 13-4 and 13-5):
1.- disconnect power to the boiler;
2.- lay a bipolar electrical cable with 1,5 mm
2
minimum
cross-section going from the boiler to the storage tank
temperature sensor and connect it on the boiler to terminals
“12” and “13” (SB);
3.- connect the other end of the cable to the storage tank
temperature probe;
4.- put the temperature sensor probe inside the storage tank
well (see figure 10-2, part “31”).
5.- set parameter
3012
to “1” (see section 19)
6.- electrically connect the storage tank pump to terminals 107
and 108 of the boiler (see figures 13-4 and 13-5).
The temperature of the water stored inside the storage tank
can be selected by the user within a 40-60°C range.
ATTENTION !!! A water temperature exceeding
51°C can cause even permanent harm to persons,
animals and objects.
Above all, children, the elderly and the disabled must
be protected against the potential risk of scalds
by putting in devices that limit the temperature of
domestic hot water use to the domestic utilities.
13.2.1 - D.H.W. production priority
The boiler comes out of the factory set with total priority
given to domestic hot water production. This means that
the boiler works in domestic mode until the required
temperature in the connected storage tank is reached. For
this reason, said setting could lead to cooling of the room
that needs to be heated. Once the domestic hot water
demand is met, the appliance automatically goes back to
working for the heating circuit.
