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DIVAtop MICRO C
If the room temperature is lower than the required value, it is advisable to set a higher
order curve and vice versa. Proceed by increasing or decreasing in steps of one and
check the result in the room.
90
85
80
70
60
50
40
30
20
20
10
fig. 14 - Compensation curves
OFFSET = 20
90
10
9
8
7
85
6
80
5
70
4
60
3
50
2
40
1
30
20
20
10
0
-10
-20
fig. 15 - Example of compensation parallel curve offset
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. Also, the control pan-
el display (detail 5 - fig. 1) shows the actual room temperature read by the
Remote Timer Control.
Table. 1
Heating temperature setting
Hot water temperature adjustment
Summer/Winter Switchover
Eco/Comfort selection
Sliding Temperature
Water system pressure adjustment
The filling pressure with system cold, read on the boiler water gauge, must be approx.
1.0 bar. If the system pressure falls to values below minimum, the boiler card will activate
fault F37 (fig. 16).
fig. 16 - Low system pressure fault
Operate the filling cock (detail 1 - fig. 16) and bring the system pressure to a value above
1.0 bar.
At the bottom of the boiler there is a pressure gauge (detail 2 - fig. 16) that gives the pres-
sure even in case of no power supply.
A
Once the system pressure is restored, the boiler will activate the 120-second
air venting cycle indicated on the display by FH.
At the end of the operation always close the filling cock (detail 1 - fig. 16)
10
9
8
7
6
5
4
3
2
1
0
-10
-20
OFFSET = 40
90
10
9
8
7
85
80
70
60
50
40
30
20
20
10
0
-10
Adjustment can be made from the Remote Timer Control
menu and the boiler control panel.
Adjustment can be made from the Remote Timer Control
menu and the boiler control panel.
Summer mode has priority over a possible Remote Timer
Control heating demand.
On disabling DHW from the Remote Timer Control menu,
the boiler selects the Economy mode. In this condition, the
button 7 - fig. 1 on the boiler panel is disabled.
On enabling DHW from the Remote Timer Control menu, the
boiler selects the Comfort mode. In this condition it is possi-
ble select one of the two modes with the button 7 - fig. 1 on
the boiler panel.
Both the Remote Timer Control and the boiler card manage
Sliding Temperature adjustment: of the two, the Sliding Tem-
perature of the boiler card has priority.
cod. 3540S270 - 02/2010 (Rev. 00)
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 provided with the optional antiwind grille, the unit is suitable for operation in a partially
protected place in compliance with EN 297 pr A6, with min. temperature of -5°C. If
equipped with the special antifreeze kit it can be used with minimum temperature as low
as -15°C. The boiler must be installed under the slope of a roof, inside a balcony or in a
sheltered recess.
Therefore the place of installation must be free of dust, flammable materials or objects
or corrosive gases.
6
5
The boiler is arranged for wall mounting and c omes standard with a hooking bracket. Fix
4
the bracket to the wall according to the measurements given in the cover drawing and
3
hook the boiler on it. A metal template for marking the drilling points on the wall is avail-
2
able by request. The wall fixing must ensure a stable and effective support for the gen-
erator.
1
A
f 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
-20
Important
The heating capacity of the unit must be previously established by calculating the build-
ing's heat requirement according to the current regulations. The system must be provid-
ed with all the components for correct and regular operation. It is advisable to install on-
off valves between the boiler and heating system allowing the boiler to be isolated from
the system if necessary.
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.
Do not use the water system pipes to earth electrical appliances.
Before installation, carefully wash all the pipes of the system to remove any residuals or
impurities that could affect proper operation of the unit.
Carry out the relevant connections according to the diagram in fig. 17 and the symbols
given on the unit.
1 = System delivery
2 = Domestic hot water outlet
3 = Gas inlet
System water charcteristics
In the presence of water harder than 25° Fr (1°F = 10ppm CaCO
treated water is advisable in order to avoid possible scaling in the boiler. The treatment
must not in any case reduce the hardness to values below 15°F (Decree 236/88 for uses
of water intended for human consumption). Water treatment is indispensable in the case
of very large systems or with frequent replenishing of water in the system. If partial or
total emptying of the system becomes necessary in these cases, it is advisable to refill it
with treated water.
Antifreeze system, antifreeze fluids, additives and inhibitors
The boiler is equipped with an antifreeze system that turns on the boiler in heating mode
when the system delivery water temperature falls under 6°C. The device will not come
on if the electricity and/or gas supply to the unit are cut off. If it becomes necessary, it is
permissible to use antifreeze fluid, additives and inhibitors only if the manufacturer of
these fluids or additives guarantees they are suitable for this use and cause no damage
to the heat exchanger or other components and/or materials of the boiler unit and sys-
tem. It is prohibited to use generic antifreeze fluid, additives or inhibitors that are not ex-
pressly suited for use in heating systems and compatible with the materials of the boiler
unit and system.
3
2
4
5
1
6
55
85
76
105
80,5
103,5
fig. 17 - Plumbing connections
4 = System return
5 = Cold water inlet
6 = Safety valve drain
EN
), the use of suitably
3
31
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