Glow-worm 45/2 Back Boiler - Manual (Page 10)

10 221780A
Diagram 5.3
8019
CABLE
CLAMP
EARTH STUD
Diagram 5.2
Diagram 5.1
5 Electrical Wiring
8011
MAINS
CABLE
THERMOSTAT
CAPILLARY
TO R.H.
PHIAL
POCKET
CABLE
CLIPS
CAPILLARY
CLIPS
MAINS
FROM
R.H.S.
CAPILLARY
CUT-OUT
SECURING SCREW
8012 GAS VALVE
ELECTRICAL PLUG
5.1 General
WARNING. This boiler must be earthed.
ISOLATE THE ELECTRICAL SUPPLY BEFORE DOING ANY
WIRING.
All of the electrical installation must be correctly earthed and be
in accordance with the current issue of BS7671 and be carried
out by a competent person.
The mains supply required is 230V~ 50Hz, fused at 3A. A
double pole isolating switch, having a minimum contact
separation of 3mm in both poles should be used.
The mains cable should be PVC heat resistant to 85 o C the
current issue of BS6500 Table 16, not less than 0.75mm 2 (24/
0.20mm).
Make sure that there is sufficient cable slack to ease future
servicing or replacement.
It is preferable to have the electrical supply cable coming from
the left hand side of the builder’s opening.
If however, it must come from the right hand side, it must be
secured under the front edge of the combustion chamber
extension using the two cable clips, from the fittings pack, as
shown in diagram 5.1.
Make sure that all cables are routed well clear of hot surfaces.
5.2 Access to the Boiler Control Box
Disconnect the gas valve electrical plug, (if not already removed)
see diagram 5.2.
Remove the electrical control box securing screw and lift the
box upwards to release, see diagram 5.5.
5.3 Control Box Wiring
Thread the cable through the rear of the box, see diagram 5.3.
The mains cable outer insulation must not be cut back external
to the clamp.
When making connections, make sure that the earth conductor
is made of a greater length than the current carrying conductors,
so that if the cable is strained the earth conductor would be the
last to become disconnected.
Connect the incoming mains earth conductor to the terminal
on the terminal block, see diagram 5.3 and 5.4.
Connect the incoming mains neutral conductor to N and boiler
control live to L
s .