BX2000
Installation Instructions
Bx2000 has been designed to provide greater flexibility to the consumer using Off-Peak
electricity for Water heating. It provides the facility to Boost your Hot water at any time and
to ensure you are automatically connected to the Off-Peak supply whenever it is available.
INSTALLATION AND CONNECTION SHOULD ONLY BE CARRIED OUT BY A SUITABLY
QUALIFIED PERSON AND IN ACCORDANCE WITH THE CURRENT EDITION OF THE
IET WIRING REGULATIONS.
WARNING : ISOLATE MAINS SUPPLY. BEFORE COMMENCING INSTALLATION
ENSURE THE UNIT IS PROPERLY EARTHED.
The BX2000 should be mounted on a standard conduit box or directly onto the wall. It
should NOT be mounted on an unearthed metal surface. The BX2000 should be
connected to the incoming supplies using 3 core cable with a minimum conductor size of
2
1.5 . Heat resisting flexible cords should be used to make connection to the
mm
immersion heater(s).
Means of disconnection from the 24 Hour and Off Peak supplies having at least 3mm
contact separation in both poles must be incorporated in the fixed wiring (This is usually
provided in the consumer unit). Both the Off Peak and 24 Hour supplies must be on the
same phase. Both the Off Peak and 24 Hour supplies should be protected by a 15 amp
HRC fuse or, preferably a 16 amp MCB. In some cases immersion heater failure can
damage the BX2000. Installation of a 100 mA RCD will provide additional protection for
the unit. If the BX2000 is to be connected to a ring main then the spur feeding the controller
should be protected in the same way.
1
Mounting
The BX2000 should be removed from the mounting box by unscrewing the 2
captive screws securing the
unit.
Conduit Box Mounting
Use either the 2 holes
marked
'A' (see diagram) to secure
to a single gang box, or the
two holes marked 'C' for a
double gang box. Cable
entry is through the cut-out
between the 2 fixing holes
'A'.
Surface Mounting
Use the two holes marked 'B'
(see diagram). Cable entry is through the most appropriate cut-out.
REMOVE THE APPROPRIATE CABLE ENTRY CUT-OUTS BEFORE FIXING THE
BOX, WHERE POSSIBLE DRILL THE BOX TO PROVIDE A CLOSE FITTING
ENTRY FOR CABLES AND HEAT-RESISTANT FLEXIBLE CORDS. TAKE CARE TO
REMOVE SHARP EDGES .
Connections - Single Immersion Heater
Use a three-core cable with a minimum conductor size 1.5mm to connect the unit to
2
the supply. Connect the incoming wires to the terminal block as follows;
TERMINAL 1 - Link to Terminal 7
TERMINAL 2 - Link to Terminal 8
TERMINAL 3 - LIVE 24 Hour On Peak (Boost) supply in
TERMINAL 4 - NEUTRAL 24 Hour On Peak (Boost) supply in
TERMINAL 5 - LIVE out to immersion heater
TERMINAL 6 - NEUTRAL to immersion heater
TERMINAL 7 - Linked to Terminal 1
TERMINAL 8 - Linked to Terminal 2
TERMINAL 9 - LIVE Off Peak supply in
TERMINAL 10 - Neutral Off Peak supply in
Clamp all surface wiring adjacent to the box or use trunking where appropriate.
Secure the heat resistant flexible cords from the immersion heaters using the cable
clamp in the box.
2
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