Bartscher 110 Serie Instalación Uso Y Mantenimiento página 37

necessary to proceed as described in the paragraph "Functioning with gas different from the
setting". The connections to the threaded coupling, having a diameter of ¾ inch, situated on the
bottom of the appliance, may be fixed or mobile using a compliant rapid pipe fitting. If flexible
piping is used, this must be in stainless steel and compliant with the norm. All the seals on the
junction threads must be in guaranteed materials certified for use with gas. Before the installation of
each single appliance it is necessary to install a cutoff cock for rapid interruption of the gas supply,
placed in an easily accessible position in such a way as to make it possible to turn off the gas supply
when the appliance is not being used. When the connection has been completed, the tightness must
be checked by using a leak-finder spray.
Electric connection
Before connecting the appliance, it is necessary to check that the voltage of the power supply
available corresponds to the voltage the appliance has been set for. In the event that they do not
correspond, it is necessary to modify the connection as shown in the electric diagram, if voltage
change is provided for. The terminal blocks are situated behind the instrument board and they can
be removed unscrewing the 2 screws that fix the support and pulling out the same and the terminal
blocks. Furthermore, the efficiency of the earth connection must be checked, and also that the earth
conductor on the connecting side is longer than the other conductors, and that the connecting cable
has a wire bunch adequate for the power absorbed by the appliance and is at least type H05 RN-F.
As in international provisions, before installing the appliance a omnipolar switch device must
be installed with a contacts opening of at least 3mm which must not interrupt the YELLOW-
GREEN earth wire. The device must be installed near the appliance, it must be approved and have
adequate capacity for the absorption of the appliance (see technical features).
The appliance must be connected to the EQUIPOTENZIALE system. The connector is situated near
the end of the electric cable and is identified by a label with the symbol shown on figure 6 (pag.4).
By using a safety thermostat for breakdown tensions there must observe what follows:
- According to the ruling normative law, the leakage of electric power for these kind of
appliances can have a value of 1 mA without limitations for the maximum for each kW of
installed power. Besides, there must take care that all the switches for breakdown found on
the market have a tolerance for the operating tension of less than the 50%; that's why there
must be chosen a suitable switch.
- Connect only a single appliance for each switch
- In some cases it is possible that the appliance after long periods of inactivity or in case of a
new installation, switches off during working. Most of the times the main reason is the moist
produced during the isolation. The problem can be easily resolved with a short pre-heating
bypassing the safety thermostat.
Checking gas tightness and pressure (fig.7 – pag.4)
Before proceeding to check the pressure, it is necessary to check the tightness of the gas installation
up to the nozzle with a leak-finder spray to ensure that no damage has been done to the appliance
during transportation. Then it is possible to proceed with checking the inlet pressure, which is done
by means of a gauge for liquids , either a "U" gauge or an electronic gauge with a minimum
definition of 0,1 mbar. To carry out the reading, the screw (1) must be removed from the pressure
outlet (2) and the rubber pipe of the gauge connected. Open the gas supply valve of the appliance,
check the pressure output and close the valve. Remove the pipe of the gauge and put back the
Pag. 36/66