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System draining
The drain faucet ring nut is located under the safety valve inside the boiler.
To drain the system, turn the ring (ref. 1 - fig. 9) counter-clockwise to open the faucet. Do
not use any tools; use hands only.
To drain only the water in the boiler, first close the shut-off valves between the system
and boiler before turning the ring.
fig. 9- Safety valve with drain faucet
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
B
The combustion circuit is sealed with respect to the place of installation
and therefore the unit can be installed in any room except in a garage. The
place of installation must be sufficiently ventilated to prevent the creation
of dangerous conditions in case of even small gas leaks. Otherwise there
may be a risk of suffocation and intoxication or explosion and fire. This
safety precaution is required by EEC Directive No. 2009/142 for all gas
units, including so-called sealed chamber units.
The unit is designed to operate in a partially protected place, with a minimum tempera-
ture of -5°C. If provided with the special antifreeze kit, it can be used with a minimum tem-
perature down to -15°C. The boiler must be installed in a sheltered place, for instance
under the slope of a roof, inside a balcony or in a protected recess.
The place of installation must be free of flammable materials, objects and dusts or cor-
rosive gases.
The boiler is arranged for wall mounting and comes as standard with a hooking bracket.
Wall fixing must ensure stable and effective support for the generator.
If the unit is enclosed in a cabinet or mounted alongside, there must be suffi-
A
cient space for removing the casing and for normal maintenance activities
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. 25 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
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.
4
EN
1
), use suitably treated
3
cod. 3541P873 - Rev. 00 - 04/2021
Connection to a storage tank for domestic hot water
The unit's electronic card is arranged for managing an external storage tank for domestic
hot water production. Carry out the plumbing connections according to the diagram of
fig. 10. Carry out the electrical connections as shown on the wiring diagram in fig. 30. It
is necessary to use the kit code 1KWMA11W. At the next lighting, the boiler control sys-
tem detects the hot water tank probe and automatically configures the DHW function, ac-
tivating the display and relevant controls.
278
8
114
9
14
10
fig. 10- Diagram of connection to an external hot water tank
8
Domestic hot water outlet
9
Cold water inlet
10
System delivery - Ø 3/4"
11
System return - Ø 3/4"
95
Diverter valve
209
Hot water tank delivery - Ø 3/4"
210
Hot water tank return - Ø 3/4"
3.4 Gas connection
The gas must be connected to the relevant connection (see fig. 25) in conformity with the
current standards, using a rigid metal pipe or a continuous surface flexible s/steel tube
and installing a gas cock between the system and boiler. Make sure all the gas connec-
tions are tight.
3.5 Electrical connections
IMPORTANT
B
BEFORE CARRYING OUT ANY OPERATION THAT REQUIRES REMOVING
THE CASING, DISCONNECT THE BOILER FROM THE ELECTRIC MAINS
WITH THE MAIN SWITCH.
NEVER TOUCH THE ELECTRICAL COMPONENTS OR CONTACTS WITH
THE MAIN SWITCH TURNED ON! DANGER OF ELECTRIC SHOCK WITH
RISK OF INJURY OR DEATH!
B
The unit must be connected to an efficient grounding system in accordance with
applicable safety regulations. Have the efficiency and suitability of the ground-
ing system checked by professionally qualified personnel; the Manufacturer de-
clines any liability for damage caused by failure to earth the system.
The boiler is prewired and provided with a three-pole cable, without a plug, for
connection to the electric 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 be-
tween the boiler and the line. Make sure to respect the polarities (LINE: brown
wire / NEUTRAL: blue wire / GROUND: yellow-green wire) in the connections
to the electric line.
B
The unit's supply cable MUST NOT BE REPLACED BY THE USER. If the ca-
ble gets damaged, turn the unit off and have the cable replaced only by
professionally qualified personnel. In case of replacement, only use cable
"HAR H05 VV-F" 3x0.75 mm2 with max. external diameter of 8 mm.
Room thermostat (optional)
B
IMPORTANT: THE ROOM THERMOSTAT MUST HAVE VOLTAGE-FREE
CONTACTS. CONNECTING 230 V TO THE ROOM THERMOSTAT TERMI-
NALS WILL PERMANENTLY DAMAGE THE ELECTRONIC BOARD.
When connecting time controls or a timer, do not take the power supply for
these devices from their breaking contacts Their power supply must be by
means of direct connection from the mains or with batteries, depending on the
kind of device.
DIVAtech D HF
27
2
1
3
0
4
36
56
241
32
74
95
210
209
11
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