INSTRUCTIONS FOR INSTALLATION
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12
If the capacity of the in built expansion vessel on Plus - E & PTV - E is not sufficient for the heating system, an
additional expansion vessel can be installed external to the boiler. This should be fitted to the return pipe as close
as possible to the boiler.
To comply with Part L of building regulations, a room thermostat must be fitted with the boiler. The room
thermostat should not be sited over radiator or other heat source and should not be in direct sunlight.
Thermostatic radiators valves may also be used, but should not be fitted in the same room as the room
thermostat.
After the central heating circuit has been laid open all service valves, flush pipes through and check for leaks
before commissioning and introduce the correct inhibitor for a central heating circuit in accordance with BS7593.
Commission the boiler slowly to allow air to escape through the automatic air vent. Remove air from pump using
front screw on pumps.
Pressurize the system to 1.5 bar.
Where the boiler is being retro-fitted to an existing installation, it is equally important to flush the system and
commission using inhibitor to BS7593.,
TERMO boilers are fitted with an automatic and manual air vent. The boilers are also equipped with an air-
indicator which detects the presence of air in the boiler. If air is detected and It exceeds the permitted level, air-
indicator switches off immersion heaters and circulation pump remains active, so that air is allowed to escape
easily. Once the air is dispelled the immersion heaters will be active.
3.5. Connection to the electrical mains supply
Before working with the appliance, turn off the power supply (MCB) and secure against restart.
This device must be earthed.
Check that the electrical supply to the building has sufficient current and voltage to supply the boiler and other
appliances to be used.
Miniature circuit breakers (MCB) must be fitted in the
wiring prior to the boiler. For MCB ratings see table on
page 8.
Connect boiler to mains using double pole linked
switch with 3mm contact gap in both poles. There is
an RCD switch factory fitted inside the boiler. Supply
cables must be connected to RCD switch inside boiler
as shown below. Stretching force of the network
connection is 3,5 Nm.
In order to connect power supply cable, power
connection protection cover (1) must be removed by
unwinding two screws and pulling protection cover
down. The power cable must be connected directly to
RCD, earth must be connected to separate terminal
(3). After connecting power cable, protective cover (1)
must be replaced and securely fastened.
After electrical installation is completed carry out
preliminary safety checks according to BS7671:2001
Power supply connection
Boilers with power 10.8kW and 14.4 kW
Boilers with power 4.8, 6, 7.2 kW
RCCB (RCD) connection closeup
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