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3.4 Gas connection
The gas must be connected to the relevant connection (see fig. 14) 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
The unit must be connected to an efficient earthing system in conformity with
current safety regulations. Have the efficiency and suitability of the earthing
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 "Y" type cable (without plug) for con-
nection to the electric line. The connections to the power supply must be per-
manent and equipped with a double-pole switch with contact opening distance
of at least 3 mm, installing fuses of max. 3A between the boiler and the line.
Make sure to respect the polarities (LINE: brown wire / NEUTRAL: blue wire /
EARTH: yellow/green wire) in connections to the electric line.
B
The unit's power cable must not be replaced by the user; if damaged, switch
the unit off and have the cable replaced by professionally qualified personnel.
If replacing the power cable, only use "HAR H05 VV-F" 3x0.75 mm2 cable with
max. ext. 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.
Accessing the electrical terminal block
The electrical terminal block can be accessed after removing the casing. The layout of
the terminals for the various connections is given in the wiring diagram in fig. 18.
72
139
fig. 8 - Accessing the terminal block
3.6 Air/fume ducts
The diameter of the flue connection pipe must not be less than that of the connection on
the anti-backflow device. Starting from the anti-backflow device it must have a vertical
section at least 50 cm long. Current standards must be complied with regarding sizing
and installation of the flues and connection pipe.
B
The boiler is also equipped with a safety device (fume thermostat) that stops
operation of unit in case of inadequate draught of obstruction of the flue. This
device must never be tampered with or deactivated.
12
EN
All manuals and user guides at all-guides.com
4. SERVICE AND MAINTENANCE
4.1 Adjustments
Gas conversion
The unit can work on natural gas or LPG and is factory-set for use with one of these two
gases, as clearly shown on the packing and data plate. Whenever a different gas to that
for which the unit is arranged has to be used, the special conversion kit will be required,
proceeding as follows:
1.
2.
3.
4.
5.
6.
TEST mode activation
Press the heating buttons (detail 3 - fig. 1) together for 5 seconds to activate the TEST
mode. The boiler lights at the maximum heating power set as described in the following
section.
The heating and DHW symbols (fig. 9) flash on the display; the heating power will appear
alongside.
155
10
kOhm
1,8
Press the heating buttons (details 3 and 4 - fig. 1) to increase or decrease the power
kOhm
(Min.=0%, Max.=100%).
If the TEST mode is activated and enough hot water is drawn to activate the DHW mode,
the boiler remains in TEST mode but the 3-way valve goes to DHW.
To deactivate the TEST mode, press the heating buttons (details 3 and 4 - fig. 1) together
for 5 seconds.
3
4
The TEST mode is automatically deactivated in any case after 15 minutes or on stopping
of hot water drawing (if enough hot water has been drawn to activate the DHW mode).
Adjustment of pressure at the burner
Since this unit has flame modulation, there are two fixed pressure values: the minimum
and maximum, which must be those given in the technical data table according to the
type of gas.
•
•
•
•
•
•
•
•
•
•
•
A
cod. 3541E901 - Rev. 00 - 12/2015
Disconnect the power supply ahead of the boiler and close the gas cock;
Replace the nozzles at the main burner and pilot burner, fitting the nozzles indicated
in the technical data table in cap. 5, depending on the type of gas used
Connect the power supply ahead of the boiler and open the gas cock;
Modify the parameter for the type of gas:
•
put the boiler in standby mode
•
press the DHW buttons details 1 and 2 - fig. 1 for 10 seconds: the display shows
"b01" flashing.
•
press the DHW buttons details 1 and 2 - fig. 1) to set parameter 00 (for opera-
tion with natural gas) or 01 (for operation with LPG).
•
press the DHW buttons details 1 and 2 - fig. 1 for 10 seconds.
•
the boiler will return to standby mode
Adjust the minimum and maximum pressures at the burner (ref. relevant para-
graph), setting the values given in the technical data table for the type of gas used
Apply the sticker, contained in the conversion kit, near the data plate as proof of the
conversion.
fig. 9 - TEST mode (heating power = 100%)
Connect a suitable pressure gauge to pressure point "B" located downstream of the
gas valve
Remove the protection cap "D" undoing screw "A".
Operate the boiler in TEST mode.
Adjust the power to the max. value.
Adjust the max. pressure with screw "G", clockwise to increase the pressure and
anticlockwise to decrease it
Disconnect one of the two Faston connectors from the modureg "C" on the gas
valve.
Adjust the min. pressure with screw "E", clockwise to decrease the pressure and
anticlockwise to increase it.
Reconnect the Faston connector detached from the modureg on the gas valve.
Check that the maximum pressure has not changed.
Refit protection cap "D".
To end the TEST mode repeat the activation sequence or wait 15 minutes.
After checking or adjusting the pressure, make sure to seal the adjust-
ment screw with paint or a specific seal.
DIVA HC24
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