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Connections for 2 or more boilers.
1 CONN 5: Main power-supply cables. Connect each boiler to its supply live, neutral, and earth,
as described above. The supplies to each boiler can be on different phases if using a 3-phase
supply.
2 CONN 1 pins 2 & 3: Control signal. Join all the boiler 'R' terminals on the control terminal
block together, and then connect them to the switched live control signal to the programmer
control circuit. Connect all the boiler 'N' terminals on the control terminal block together and
then to neutral on the programmer control circuit.
3 CONN 1: Pump connections. The pump must be connected through a relay assembly to
ensure
that the pump always operates if any one boiler is running. See page 26. Relay
box 94970057 is required for a two boiler system and 94970058 is required for a 3 boiler
system.
Check the main electrical power connections are tight. Support the back of the PCB behind the power
terminals when tightening the main power terminals. Loose connections can cause burning at the
connectors and will invalidate the warranty.
The control RUN signal is optically isolated from the main boiler supply to enable different phases to
be used between boilers. The control signal required to operate the boiler is 220V - 240V at a very
low current, typically 10mA.
WARNING: THIS APPLIANCE MUST BE EARTHED.
All exposed pipework must be earthed in accordance with IEE Regulations.
After installation, preliminary electrical checks i.e. short circuit, earth continuity, resistance to earth
and check for correct polarity etc. must be carried out.
Before connecting the electrical supply, ensure the system is full of water and set to the correct
pressure (sealed systems), check for leaks. It is essential that all the air is purged from the system.
Only then can the supply be switched on.
On completion of the work the installation must be tested to IEE Regulations and an NICEIC Inspection
and Completion Certificate must be issued.
Please take note of the installation information. If in doubt please contact your local supplier or
Potterton Gold.
FIGURE SEVEN: BOILER INTERNAL SCHEMATIC
10
CONN1
N
R
E
N
CONTROL
N
L
CONN5
E
L
ELEMENT
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