DIVA HC24
11
EN
cod.
3541E901 - Rev. 00 - 12/2015
Room temperature adjustment (with optional remote timer control)
Using the remote timer control, set the required temperature in the rooms. The boiler will
adjust the system water according to the required room temperature. For operation with
remote timer control, please refer to the relevant instruction manual.
Hot water tank exclusion (economy)
Hot water tank temperature maintaining/heating can be excluded by the user. If exclud-
ed, domestic hot water will not be delivered.
The hot water tank can be deactivated by the user (ECO mode) by pressing the ECO/
COMFORT button (detail 7 - fig. 1). In ECO mode the display activates the ECO symbol
(detail 12 - fig. 1). To activate COMFORT mode, press the ECO/COMFORT button (de-
tail 7 - fig. 1) again.
Adjustments from Remote Timer Control
A
If the Remote Timer Control (optional) is connected to the boiler, the above ad-
justments are managed according to that given in table 1.
Table. 1
System water pressure adjustment
The filling pressure with system cold, read on the boiler water gauge (detail 17 - fig. 1),
must be approx. 1.0 bar. If the system pressure falls to values below minimum, the boiler
stops and fault
F37
is displayed. Operate the filling cock, if connected to the water sys-
tem (detail 1 fig. 6), and bring it to the initial value. Always close the filling cock at the end
of the operation.
fig. 6 - Filling cock
3. INSTALLATION
3.1 General Instructions
BOILER INSTALLATION MUST ONLY BE PERFORMED BY QUALIFIED PERSON-
NEL, IN ACCORDANCE WITH ALL THE INSTRUCTIONS GIVEN IN THIS TECHNICAL
MANUAL, THE PROVISIONS OF CURRENT LAW, THE PRESCRIPTIONS OF NA-
TIONAL AND LOCAL STANDARDS AND THE RULES OF PROPER WORKMANSHIP.
3.2 Place of installation
This unit is an
“open chamber”
type and can only be installed and operated in perma-
nently ventilated rooms. An insufficient flow of combustion air to the boiler will affect its
normal operation and fume evacuation. Also, the fumes forming under these conditions
are extremely harmful to health if dispersed in the domestic environment.
If equipped with the optional antiwind grille, the unit is suitable for use in a partially pro-
tected place in accordance with EN 297 pr A6, with minimum temperature of -5°C. It is
advisable to install the boiler under a roof slope, inside a balcony or in a protected recess.
Therefore the place of installation must be free of dust, flammable materials or objects
or corrosive gases.
The boiler is arranged for wall mounting and comes standard with a hooking bracket. Fix
the bracket to the wall according to the measurements given in fig. 12 and hook the boiler
onto it. Wall fixing must ensure a stable and effective support for the generator.
A
If the unit is enclosed in a cabinet or mounted alongside, a space must be pro-
vided for removing the casing and for normal maintenance operations.
3.3 Plumbing connections
Important
B
The safety valve outlet must be connected to a funnel or collection pipe to pre-
vent water spurting onto the floor in case of overpressure in the heating circuit.
Otherwise, if the discharge valve cuts in and floods the room, the boiler manu-
facturer cannot be held liable.
B
Before making the connection, check that the unit is arranged for operation with
the type of fuel available and carefully clean all the system pipes.
Carry out the relevant connections according to the diagram in fig. 14 and the symbols
on the unit.
Note:
The unit is equipped with an internal bypass in the heating circuit.
Water system characteristics
In the presence of water harder than 25° Fr (1°F = 10ppm CaCO
3
), use suitably treated
water in order to avoid possible scaling in the boiler.
Antifreeze system, antifreeze fluids, additives and inhibitors
When necessary, antifreeze fluids, additives and inhibitors can be used only if the man-
ufacturer of such fluids or additives guarantees that they are suitable and do not cause
damage to the exchanger or other components and/or materials of the boiler and system.
Do not use generic antifreeze fluids, additives or inhibitors that are not specific for use in
heating systems and compatible with the materials of the boiler and system.
Connection to a storage tank for domestic hot water production
The unit's electronic board is arranged for managing an external storage tank for domes-
tic hot water production. Make the plumbing connections according to the diagram of
fig. 7. Make the electrical connections as shown on the wiring diagram in sec. 18. It is
necessary to use the kit code 1KWMA11W. At the next lighting, the boiler's control sys-
tem recognizes the presence of the hot water tank probe and automatically configures
the DHW function, activating the display and relevant controls.
fig. 7 - Diagram of connection to an external hot water tank
8
Domestic hot water outlet
9
Cold water inlet
10
System delivery
11
System return
95
3-way valve
209
Hot water tank delivery
210
Hot water tank return
Heating temperature setting
Adjustment can be made from the Remote Timer Control menu and the
boiler control panel.
Hot water temperature adjustment
Adjustment can be made from the Remote Timer Control menu and the
boiler control panel.
Summer/Winter Switchover
Summer mode has priority over a possible Remote Timer Control heat-
ing demand.
Eco/Comfort selection
Adjustment can only be made from the boiler control panel.
1
8
9
10
210
209
11
95
