m return - mbm-Service GmbH

3. ELECTRICAL CONNECTION
• The appliance must be connected to the mains power supply
in compliance with current regulations.
• Before connecting the appliance to the mains supply, make
sure that the voltage and frequency shown on the appliance
rating plate correspond with that of the power supply.
• The appliance must be permanently connected to the mains
power supply with an H05 RN-F type cable. The power supply
cable must be protected by a metal or rigid plastic tube. If the
appliance is connected by way of an existing lead, do not insert
the installation tube in the appliance and make sure the tube
has no sharp edges.
• A safety cutout switch of suitable capacity with a contact
breaking distance of at least 3 mm must be fitted upstream of
the appliance.
This cutout switch must be installed near the appliance in the
permanent electrical system of the premises.
• The appliance must be suitably earthed. The earthing conductor
must therefore be connected to the terminal marked G on
the connection terminal board. The appliance must also be
connected to an equipotential system.
This connection is made using the stop screw marked E
located on the outside of the appliance near the power cable
inlet.
The equipotential wire must have a minimum cross-section of
10 mm 2 .
4.1 INSTALLING THE POWER SUPPLY CABLE
(Fig. "10")
To access the power supply cable connection terminal board,
proceed as follows:
Mod. 6 GN1/1 - 10 GN1/1 - 10 GN2/1
• Undo screws "V" fixing the terminal board support panel located
underneath the appliance on the front LH side.
• Feed the power supply cable through cable clamp inlet "B".
• Connect the cable to terminal board “A” as shown in the
enclosed wiring diagram and fasten with the corresponding
cable clamp.
• Remount the panel and secure with the fixing screws.
10
Mod. 20 GN1/1 - 20 GN2/1
• Open the control panel.
• Connect the cable to terminal board as shown in the enclosed
wiring diagram and fasten with the corresponding cable clamp.
The manufacturer declines any responsibility for failure to
comply with existing accident prevention standards.
41
4. WATER MAINS CONNECTION
(Refer to the installation diagrams at the beginning of this booklet).
The appliance is fitted with two separate water inlets ("B" and "N").
The water lines supplying both inlets must be fitted with a
mechanical filter and shut-off cock.
Before fitting the filters, pump water through the system to expel
any solid particles from the piping.
4.1. WATER SUPPLY CHARACTERISTICS
4.1.1 Water inlet "N".
The steam condensation system must be connected to a cold
drinking water supply with the following characteristics:
- total hardness: up to 40°F;
- pressure: 150 to 250 kPa (1.5-2.5 bar); higher pressure
values result in increased water consumption.
4.1.2 Water inlet "B".
The steam production system must be connected to a drinking
water supply with the following characteristics:
- total hardness: 0.5 to 5 °F to prevent the build-up of limescale
inside the boiler (or oven chamber on models with automatic
generation).
On request the oven is supplied with an optional water softener
device with automatic regeneration which must be installed on
inlet line "B". This device is also supplied with a resin sterilisation
kit (available on request).
- pressure: 150 to 250 kPa (1.5-2.5 bar); higher pressure
values result in increased water consumption.
- chlorine ion concentration (Cl -): not more than ~10 ppm
(acceptable value) to avoid damaging the oven's internal steel
elements.
- pH: over 7.
On request the oven is supplied with an optional special filtration
unit which is installed on inlet line "B". This unit also acts as a water
softener by reducing water hardness to less than 5°F.
- electrical conductivity: 50 to 2000 µS/cm (20°C).
Important: Only install the water treatment systems supplied by
the manufacturer. Failure to do so automatically invalidates the
guarantee.
The use of dosing systems designed to prevent the buildup
of lime-scale in pipes (i.e. polyphosphate dosing
systems) is also prohibited since it may impair the
performance of the appliance.
GB