ERA MD
14
EN
cod. 3540Z410 - 03/2011 (Rev.00)
3.4 Gas connection
B
Before making the connection, make sure the unit is arranged for operation with
the type of fuel available and carefully clean all the system gas pipes to remove
any residuals or impurities that could affect proper operation of the boiler.
The gas must be connected to the respective union (see fig. 26) in conformity with cur-
rent regulations, with a rigid metal pipe or with a continuous surface flexible s/steel tube,
installing a gas cock between the system and boiler. Make sure all the gas connections
are tight.
The capacity of the gas meter must be sufficient for the simultaneous use of all the ap-
pliances connected to it. The diameter of the gas pipe leaving the boiler does not deter-
mine the diameter of the pipe between the unit and the meter; it must be chosen
according to its length and pressure losses, in conformity with the current regulations.
B
Do not use the gas pipes to earth electrical appliances.
3.5 Electrical connections
Connection to the electrical grid
B
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.
B
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.
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 electrical terminal block
The terminal block for electrical connections can be accessed after lifting the cover (see
fig. 17).
fig. 17 - Accessing the terminal block
3.6 Connection to the flue
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. The current standards must be complied with regarding the
dimensioning and installation of the flues and connection pipe.
The diameter of the collar in the anti-backflow device is given in table 3 on page 18.
4. SERVICE AND MAINTENANCE
4.1 Adjustments
All adjustment and conversion operations must be carried out by Qualified Personnel.
The manufacturer declines any liability for damage or injury caused by unqualified and
unauthorised persons tampering with the unit.
Gas conversion
The unit can operate on natural gas or LPG and is factory-set for use with one of these
two gases, as clearly shown on the packing and on the dataplate. Whenever a gas dif-
ferent from that for which the unit is arranged has to be used, the special conversion kit
will be required, proceeding as follows:
1.
Replace the nozzles at the main burner, fitting the nozzles specified in table 4 on
page 18, according to the type of gas used
2.
Modify the parameter for the type of gas:
•
put the boiler in standby mode
•
Press the
reset
button (detail 8 - fig. 1) for 10 seconds: the display shows "
TS
"
flashing
•
press the
reset
button (detail 8 - fig. 1): the display shows "
P01
".
•
Press the
DHW buttons
(details 1 and 2 - fig. 1) to set parameter 00 (for oper-
ation with natural gas) or 01 (for LPG).
•
Press the
reset
button (detail 8 - fig. 1) for 10 seconds.
•
the boiler will return to standby mode
3.
Adjust the minimum and maximum pressures at the burner (see relevant section),
setting the values given in the technical data table for the type of gas used
4.
Apply the sticker contained in the conversion kit, near the dataplate as proof of the
conversion.
B
To change from Natural Gas to LPG, it is necessary to
remove
the gas baffle
(1 - fig. 18)
To change from LPG to Natural Gas, it is necessary to
fit
the gas baffle (1 -
fig. 18 and table 4 on page 18)
fig. 18 - Gas baffle
TEST mode activation
Press the
heating buttons
(details 3 and 4 - fig. 1) together for 5 seconds to activate the
TEST
mode. The boiler lights at the maximum heating power set as described in the fol-
lowing section.
The heating symbol (detail 25 - fig. 1) and DHW symbol (detail 13 - fig. 1) flash on the
display.
fig. 19 - TEST mode (heating power = 100%)
To deactivate the
TEST
mode, repeat the activation sequence.
The
TEST
mode is automatically disabled in any case after 15 minutes.
Adjustment of pressure at 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.
•
Connect a suitable pressure gauge to pressure point "B" downstream of the gas valve.
•
Remove the protection cap "D".
•
Operate the boiler in TEST mode by pressing the heating buttons (details 3 and 4 -
fig. 1) at the same time for 5 seconds.
•
Set the heating power to 100.
•
Adjust the maximum pressure with the screw "G", clockwise to increase it and anti-
clockwise to decrease it.
•
Detach one of the two fastons "C" from the modureg on the gas valve.
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