17
221954D
7.1 Control Box Removal
Remove the electrical control box securing screws, see diagram
7.1. Slide the box forwards and release, hook it onto the lip
bracket at the front, see diagram 7.1.
7.2 Electrical Connection
WARNING:
This boiler must be earthed.
Take care not to damage any internal wiring and capillaries.
Take the plastic cable retaining clip, from the loose items pack,
peel off the backing paper and position it in a suitable place to
secure the incoming cable.
Using heat resistant (to 85
o
C) cable of at least 0.75mm
2
(24/
0.2mm) to the current issue of BS6500 Table 16 and of suitable
length, thread through the cable clamps, secure into the plastic
clips and connect to appropriate terminals, see diagram 7.2 and
11.5.
Standard colours are, brown - live (L), blue - neutral (N) and
green and yellow - earth (E).
Make sure the cable is suitably secured.
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.
NOTE:
Open Vented Water Systems ONLY.
Bridge terminals K1 and K2.
7.3 Pump Connection
The pump must be connected directly to the control box, as
shown in diagram 7.2, threading the cable through the cable
clamp in the side of the control box.
7.4 External Controls
Any external controls must only be wired to interrupt the red link
between terminals SL and 9.
Make sure that the supply cable and all external cables are
secured and away from hot surfaces.
7.5 Testing
Checks to ensure electrical safety must be carried out by a
competent person
.
After installation of the system, preliminary electrical system
checks as below should be carried out:
1. Test insulation resistance to earth.
2. Test earth continuity and short circuit of all cables.
3. Test the polarity of the mains.
The installer is requested to advise and give guidance to the
user of the controls scheme used with the boiler.
Diagram 7.2
Diagram 7.1
SECURING
SCREWS (2)
LIP BRACKET
MAINS
CABLE
CABLE
CLAMPS
MAINS
CABLE
✽
RED
LINK
✽
Remove red link between 9 & SL when fitting
a time control etc (If no switch is fitted, link will
make the circulation pump run constantly).
PUMP
CABLE
PUMP
CABLE
NOTE:
Bridge
terminal K1 & K2
on an Open
Vented System
only
IGNITION LEAD
9079
4136
7 Electrical Connectors