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3.10 Electrical Connections:
External wiring must be correctly earthed, polarised and in
accordance with BS 7671 (current edition).
All system components must be an approved type and all
electrical components should have been tested and meet the
requirements of BEAB or equivalent. All the electrical connec-
tions to the heating system must be through a common dou-
ble pole isolation switched spur that has a 3 mm separation
on each pole and has a 3A rated fuse. It should be used for
the heating system only and no other household components.
A fused three pin plug and shuttered outlet may also be used
provided they both comply with BS 1363.
Important. This appliance must be earthed and it must be
wired in accordance with these instructions. In addition, it
must have a permanent electrical supply that is not inter-
rupted by a timing device or thermostat.
Fit the electrical supply cable as shown using the connection
plug provided. The cable must be at least 0.75 mm2, PVC
insulated to BS 6500 table 16.
If a frost ‘stat is required to protect remote parts of the heat-
ing system, this should be fitted as shown.
All cables entering/leaving the appliance MUST be
restrained by use of the cable clamps.
An external controller can be fitted, in which case reference
should be made to the appropriate diagram.
Optional System Controls:
Controls are available for outside
temperature compensation and room temperature sensing.
These should be used to improve the heating system control.
They must be connected to the correct terminals as
described in their own instructions. A room thermostat
MUST NOT be used with these controls.
3.11 Fitting The Case & Control Module:
Remove the case components from their packaging. Fit the
LH and RH case panels to the appliance. Each panel hooks
over the two lugs at the top of the appliance and screws to
the base with the screws provided. Remove the controls door
from the module panel and slide the hinge pins inwards.
Offer the controls module up to the side case panels and
slide the hinge pins to locate into the case side panels. Fit
the support strap to the appliance LH side to support the
controls in the horizontal position. Connect the electrical con-
nections to the controls. Swing the controls up into their ver-
tical position and secure to the side case with the two
screws provided. Refit the controls door and fit the front
upper case and secure with the screw in the top of the boil-
er.
3.12 Electrical Testing:
Carry out electrical checks:
•
Earth continuity and short circuit of cables
•
Polarity of the mains supply
•
Insulation resistance to earth
N
L2
L1
L3
Line
(Brown)
Neutral
(Blue)
Earth
(Green/Yellow)
Mains supply: fused at 3A 230V
~
50Hz
Link
Fig.3-16
Basic electrical connections
N
L2
L1
L3
Line
(Brown)
Neutral
(Blue)
Mains supply
System
Controls
Optional Frost ‘stat
Fig.3-17
Electrical connections to system controls
