Installation - Electrical Requirements - Heatrae Sadia Amptec 95 022 001 C-400 Fitting Instructions And User Manual

INSTALLATION - ELECTRICAL REQUIREMENTS

ALL WIRING MUST BE CARRIED OUT IN ACCORDANCE WITH CURRENT IEE WIRING REGULATIONS.
The AMPTEC boiler must be installed by a qualified competent tradesman in accordance with supplied
instructions and drawings to ensure correct operation.
Check the main incoming supply to the property to ensure there is sufficient current and voltage for the size of
the boiler or boilers to be installed. Remember to also take account of the supply requirements for the rest of
the property. Ensure the correct cable size is used to feed the boiler (refer to IEE wiring regulations).
A double pole RCD with a trip level sensitivity of 30mA and capable of breaking the full load current to BS EN
61008:1994, must be used.
In order to provide a means of isolation, the boiler must be connected to the supply through a double pole
linked switch with a minimum contact gap of 3mm in all poles. The RCD is suitable for this requirement if it is
mounted in close proximity to the boiler.
A correctly rated MCB must be used in the supply, see Technical Specifications. An additional 3A supply is
required for the controls etc. NOTE, a blank must be fitted between each MCB to provide ventilation, check
with the MCB manufacture/supplier.
NOTE: The high current mains supply MUST NOT be routed through the programmer, controls etc. Follow the
wiring diagrams. Use a standard programmer, room thermostat, etc. The high current switching is carried out
inside the boiler, only standard switched live (low current) control signals are supplied by the programmer etc.
Electrical Connections
Access can be gained to the electrical connections by removing the top front panel.
1 CONN5: MAIN POWER.Main power-supply cables. Connect the power cables from the
power “supply” (CONN5) terminals on the PCB assembly in the boiler directly to the isolation switch,
live, neutral and earth. Use the correct rated cable. Do not connect the power through the
programmer, thermostats etc. The main power PCB terminals in the boiler are suitable for cables up
to 10mm . NOTE: THESE CONNECTIONS MUST BE TIGHT. LOOSE CONNECTIONS WILL
2
CAUSE A FIRE. BURNING AT CONN5 CONNECTOR IS NOT COVERED BY THE WARRENTY.
2 CONN1, pins 2 & 3: CONTROL SIGNAL.Connect switched live to ‘R’ and neutral to ‘N’ on
the control terminal block in the boiler to the switched live and neutral from the programmer control
circuit. A neutral must be connected, as this control signal is optically isolated from the main supply
in the boiler and will not run without a neutral. Do not connect any wires to the terminal marked N/C.
3 CONN1 pins 4, 5 & 6: PUMP CONNECTIONS. The supply to the pump must be connected to the
‘PUMP’ terminal on the control terminal block in the boiler. This supply is fused in the boiler at 2A.
Connections for 2 or more boilers.
1 CONN5: 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 CONN1 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 CONN1: 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 95970135 is
required for a two boiler system and 95970136 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 a fire 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.
9