7
GB
Fig.4
Fig.5
ELECTRICAL CONNECTION
ELECTRICAL WORK TO BE CARRIED OUT BY
A QUALIFIED ELECTRICIAN AND TO COMPLY
TO THE REQUIREMENTS SANS 10142-1
WARNING: THIS APPLIANCE MUST BE
EARTHED & BONDED
Before working on the appliance, shut off
mains power with its external power switch.
Before
installing
the
appliance
it
is
recommended to thoroughly check the
electrical system to verify compliance with
established regulations; the manufacturer is not
liable for damage caused by lack of grounding
or anomalous power supply.
Check that the mains power supply is rated for
the heater’s maximum power draw (refer to
the nameplate) and that the electrical cables
are suitably rated and regulatory. Multi-plugs,
extensions and adapters may not be used.
Do not use the plumbing, heating or gas pipes
for grounding the appliance. If the appliance
has a power cord which requires replacement,
use a cable of equivalent type (H05VV-F 3x1
mm
2
, dia 8,5 mm).
WARNING! For information on how to replace
the power cord, contact an authorised service
centre or professionally qualified personnel.
The power cord (H05VV-F 3x1 mm
2
, dia 8,5
mm) must be routed into the hole (fig.4) in the
back of the appliance and connected to the
thermostat terminals (fig. 5).
Use a two-pole switch conforming with CEI-
EN (contact gap of at least 3 mm, preferably
equipped with fuses) to disconnect the
appliance’s power supply. The appliance must
be grounded with a cable (yellow/green and
longer than the phase cable) connected to the
terminals marked “
“ (fig.6).
Before starting up the appliance, check that
the power rating matches that given on the
nameplate. If the appliance
has no power cord, it can be installed in one of
the following ways:
- connection to mains with a rigid pipe (if the
appliance has no cable clamp);
- with a flexible cable (H05VV-F 3x1mm2, dia.
8.5 mm) if the appliance has a cable clamp.
Preparing the system for operation
The collector cover must be left on until the final
commissioning stage. This avoids overheating
and reduces the risk of burns. The system can be
filled and started for the first time only if a heat
extractor is present. Check the flange screws are
tightened when the direct cylinder is installed.
Ensure that the connections to the water su-
pply is carried out in accordance with EN 806-1
and in any case in accordance with the applica-
ble local regulations.
Checking for leaks
Perform a pressure test as soon as the collectors
and pipes have been fitted.
• Fill the system with water using a non-
pressurised method (see following section).
• Raise the pressure to approx. 1 bar; make
sure that the system and all its connections
are watertight and that the safety valve is
working correctly.
Cleaning the system
Before filling the system, you must first clear
the piping of all residue which may have
accumulated during manufacturing and
installation.
• Completely rinse the system until all residue
has been removed.
• Next, completely empty the system.
Fig.6
Summary of Contents for THERMO DR-2
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