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6.0 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 p.3. 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 CONN 5: MAIN POWER. Main power-supply cables (HOFR cable to be used). Connect the power
cables from the power "supply" (CONN 5) 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
fire. Burning at CONN 5 connector is not covered by the warranty).
2 CONN 1, 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 CONN 1 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.
4. Cable access is made from either the right or left hand side via the X3 knockouts provided
(x1 25mm for power and x2 20mm for pump and thermostat cables). Having decided which side to
route the cables, remove x3 knockouts only. (This can be achieved with a small tap from a ball
nosed hammer, then twisting the knockout until it is removed. NOTE: Take care not to damage the
casing, ensure the metal discs are retrieved and no sharp edges are present. The cables should be
installed using a suitable strain relief bush (not supplied).
X3 KNOCKOUTS
LEFT HAND SIDE
FIGURE 5:
10
. NOTE: (These connections must be tight. Loose connections will cause a
2
X3 KNOCKOUTS
RIGHT HAND SIDE
FIGURE 6:
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