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The boiler is delivered ready for operation on 3x400V three phase supply. For operation on 230V single phase the
bridging connection supplied must be connected across the terminals of the connection block as shown.
The terminal connection block is accessed after removing the boiler front panel . The supply cable should be safely
routed to this point through the cable entry point on the right hand bottom of the boiler.
CAUTION: A mains voltage at the incorrect plug terminal can destroy the electronics.
Make sure the connectin cables are securely fastened to the plug terminals.
Wiring External Controls
It is recommended that the boiler is controlled by an external control such as a time clock or room thermostat or
a combined programmable room thermostat such as the Gabarrónmodel CTP-10.
CAUTION: The switching connection of this control should be VOLT FREE and connected to the
terminals indicated
‘TA’
on the PCB. The factory fitted link across these terminals must be removed.
The boiler’s automatic power modulation feature is activated by the initial interruption of this switching link.
4.11 ROOM THERMOSTAT CONNECTION
A
‘volt free’
room thermostat can be connected to regulate heating installation. To take advantage of the
modulation feature of MAS Boiler, the use of a room thermostat is required.
Connect the room thermostat across the terminals marked ‘TA’ on the PCB. See “12 WIRING DIAGRAMS”.
4.12 OUTDOOR NTC TEMPERATURE SENSOR CONNECTION
An outdoor temperature sensor must be fitted to the boiler to activate the auto heating regulation depending on
the outdoors temperature.
Connect a NTC sensor (10k
Ω
- 25ºC) across the terminals marked T.EXT on the PDC. See “12 WIRING
DIAGRAMS”.
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