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AXE 3 D UNIT 32 R HR

cod. 3541B310 - 10/2011 (Rev. 00)

Adjustments from Remote Timer Control

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 detected by the
Remote Timer Control.

Table. 1

System water pressure adjustment

The filling pressure with system cold, read on the display, must be approx. 1.0 bar. If the
system pressure falls to values below minimum, the boiler card will activate fault F37
(fig. 15).

fig. 15 - Low system pressure fault

Once the system pressure is restored, the boiler will activate the 120-second
air venting cycle indicated on the display by FH.

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

The boiler unit must be installed in a specific room with ventilation openings to the out-
side as prescribed by current regulations. If there are several burners or suction units
that can work together in the same room, the ventilation openings must be sized for si-
multaneous operation of all the units. The place of installation must be free of flammable
materials or objects, corrosive gases, powders or volatile substances that, conveyed by
the burner fan, can obstruct the internal lines of the burner or the combustion head. The
room must be dry and not exposed to rain, snow or frost.

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

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
shutoff valves between the boiler and heating system allowing the boiler to be isolated
from the system if necessary.

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, clean all the pipes of the system thoroughly to remove any residuals
or impurities that could affect proper operation of the unit.
Carry out the relevant connections according to the diagram in cap. 5 and the symbols
given on the unit.

Water system characteristics

In the presence of water harder than 25° Fr (1°F = 10ppm CaCO3), use suitably treated
water in order to avoid possible scaling in the boiler. Treatment must not reduce the hard-
ness to values below 15°F (Decree 236/88 for uses of water intended for human con-
sumption). Treatment of the water used is indispensable in case of very large systems
or with frequent introduction of replenishing water in the system.

If water softeners are installed at the boiler cold water inlet, make sure not to
reduce the water hardness too much, as this could cause early deterioration of
the magnesium anode in the hot water tank.

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.

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
fig. 16. Carry out: electrical connections as shown in the wiring diagram in cap. 5.4. A
probe

LAMBORGHINI

must be used.

This system requires a different parametrisation. The card Service Menu is accessed by
pressing the Reset button for 10 seconds. Press the Heating buttons to select "tS", "In",
"Hi" or "rE". "tS" means Transparent Parameters Menu, "In" Information Menu, "Hi" His-
tory Menu, and "rE" History Menu Reset. Select "tS" and press the Reset button.
The card is equipped with 20 transparent parameters also modifiable from Remote Con-
trol (Service Menu).Press the Heating buttons to scroll the list of parameters in increas-
ing or decreasing order. Press the DHW buttons to modify the value of a parameter: the
change will be automatically saved.
Change parameter

P02

of the "Transparent Parameters Menu" to

Press the Reset button to return to the Service Menu. Press the Reset button for 10 sec-
onds to exit to the card Service Menu.

fig. 16 - Diagram of connection to external hot water tank

Key

Domestic hot water outlet

Domestic cold water inlet

System delivery

System return

3-way valve - 2 wires with spring return (not provided)

3.4 Burner connection

To carry out the burner connection refer to the manual provided by the burner manufac-
turer.

3.5 Electrical connections
Connection to the electrical grid

The unit's electrical safety is only guaranteed when correctly connected to an
efficient earthing system executed according to current safety standards. Have
the efficiency and suitability of the earthing system checked by professionally
qualified personnel. The manufacturer is not responsible for any damage
caused by failure to earth the system. Also make sure that the electrical system
is adequate for the maximum power absorbed by the unit, as specified on the
boiler dataplate.

The boiler is prewired and provided with a Y-cable and plug for connection to the elec-
tricity line. The connections to the grid must be made with a permanent connection and
equipped with a bipolar switch whose contacts have a minimum opening of at least 3
mm, interposing fuses of max. 3A between the boiler and the line. It is important to re-
spect the polarities (LINE: brown wire / NEUTRAL: blue wire / EARTH: yellow-green
wire) in making connections to the electrical line. During installation or when changing
the power cable, the earth wire must be left 2 cm longer than the others.

The user must never change the unit's power cable. If the cable gets damaged,
switch off the unit and have it changed solely by professionally qualified person-
nel. If changing the electric power cable, use solely

“HAR H05 VV-F”

3x0.75

mm2 cable with a maximum outside diameter of 8 mm.

Heating temperature setting

Adjustment can be made from the Remote Timer Control menu and the boiler
control panel.

DHW 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 heating
demand.

Eco/Comfort selection

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 dis-

abled.
On enabling DHW from the Remote Timer Control menu, the boiler selects the
Comfort mode. In this condition it is possible select one of the two modes with
the

button 7

- fig. 1 on the boiler panel.

Sliding Temperature

Both the Remote Timer Control and the boiler card manage Sliding Tempera-
ture adjustment: of the two, the Sliding Temperature of the boiler card has prior-
ity.

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