6
MAKING THE ELECTRICAL CONNECTIONS
WARNING: THIS WATER HEATER MUST BE EARTHED.
The electrical installation must be in accordance with the current BS.7671 (IEE Wiring Regulations)
and “Part P” of the Building Regulations and/or local regulations
Wiring to the mains (Check the unit rating to see which applies)
Rating
Fuse/MCB
Isolating Switch Cable Size
9.5 kW
40 amps
40 amps
6 mm² / 10 mm² *
10.8 kW
45 amps
45 amps
10 mm²
12 kW
50 amps
50 amps
10 mm² /16mm² *
* For cable runs over 10 metres or where cable is not flat clipped and surface mounted,
the larger size is the minimum required.
A means for disconnection in all poles must be incorporated in the fixed wiring in
accordance with the wiring rules.
If the unit is fitted in a Bathroom:
9.5 kW and 10.8 kW Multiflow: A standard 45-amp cord operated isolator switch is recommended.
12 kW Multiflow: A double pole 50 amp isolator switch is required.
This must be mounted out of reach of the shower cubicle or bath.
(A pull cord isolator switch is not available for this model)
Wiring the Multiflow
The unit has been designed to accept up to 16mm² supply cable.
It will be necessary to cut the rubber entry grommet (diagram 6, point X to X) to enable 10mm²
and 16mm² to be correctly installed. No cutting is required for 6mm² cable.
In all cases, the outer sheath of the cable MUST project through the grommet (diagram 6),
if side entry is used. This will prevent water getting into the unit.
Strip back the insulation on the
LIVE
(brown or red) and
NEUTRAL
(blue or black) mains wires
about 8mm. Strip back any insulation on the
EARTH
(green/yellow or green) about 20mm.
Feed the cable through the side or rear entry grommets, as appropriate.
Connect the cables to the terminal block and earth stud (diagram 6)
Make sure that the live and neutral terminal block screws are tightened securely (1Nm minimum)
Make sure that the earth wire is wrapped around its terminal stud and into the saddle washer.
The nut should be tightened securely (2Nm minimum).
WARNING: FAILURE TO COMPLY WITH THESE INSTRUCTIONS COULD RESULT IN
FAILURE OF THE TERMINAL BLOCK
Check that the Power Selector Screw on the flow switch is set to “HI” (diagram 7).
If flow switch is set to “LO” only one heater element will operate.
Fit the front cover and tighten the retaining nuts.
Ensuring the earth continuity
If the unit is fitted in a bathroom, to conform with the current BS.7671 (formally IEE regulations),
the units earth continuity conductor must be effectively connected to
ALL
exposed metal parts of
ALL
other appliances in the room.
