(See Figs. 10 to 12).
10.1
The wiring between the appliance and the electrical supply
shall comply with current IEE Wiring Regulations and any local
regulations which apply.
10.2
To gain access to the electrical terminal strip.
1. Isolate the mains electrical supply.
2. Remove the cabinet front panel by pulling forwards to
release the ball studs.
3. Pull the thermostat control knob forwards to remove from
its spindle.
4. Undo the facia retaining screws and remove the plate.
10.3 Mains Wiring
Mains supply - 230 / 240 V AC ~ 50 Hz 5A External Fuse.
LIVE - Brown, NEUTRAL - Blue, EARTH - Green/Yellow
Mains Cable: 0.75mm
2
(24 x 0.20mm) to BS 6500 Table 16.
The method of connection to the appliance must allow complete
isolation of the appliance, preferably via a double pole isolator
with a contact separation of 3 mm in all poles supplying the
boiler and controls only.
The mains supply cable should be connected into the terminals
marked
L
(Live),
N
(Neutral) and
E
(Earth) on the appliance
terminal strip and securely held in the cable clamp located in the
right-hand side of the electrical tray base. To secure the cable,
remove the clamp retaining screw and pull its inner body out to
allow the cable to be fed through. With the cable in position refit
the screw and fully tighten to grip the cable. Feed the cable
between the side panel and the boiler insulation jacket and route
to the connection point avoiding any hot surfaces.
The appliance must be earthed.
10.4 Programmer
(See Fig. 11 and 12).
A time clock or programmer may be added to the control
system. A two channel programmer will allow independent
control of the central heating and hot water. However, it must be
noted that the programmer used must be suitable for gravity
feed applications when used as shown in Figs. 11 and 12, such
that the hot water channel is always on when the central
heating channel is on, otherwise the boiler will not fire when
there is a central heating demand.
10.5 Safety Check
In the event of an electrical fault after the installation of the
appliance, the electrical system shall be checked for short
circuits, fuse failure or incorrect polarity of connections.
10.6 Basic Control (Room Thermostat)
(See Fig. 11).
As supplied the hot water and central heating circuits are
controlled by the boiler thermostat. Additional control may
be obtained by the use of a room thermostat. The boiler will
r e m a i n h o t w h e n t h e r e i s n o d e m a n d v i a t h e r o o m
thermostat.
10.7 Off On No Demand (Room and Cylinder Thermostat)
(See Fig. 12).
This control system allows the boiler to cool when both the
cylinder and room thermostats are de-energised. The boiler
control thermostat must be set to a temperature above that of
the cylinder thermostat for the control system to function
correctly.
10.8 Frost Protection
(See Fig. 11 and 12).
F o r f u l l f r o s t p r o t e c t i o n a s i n g l e p o l e d o u b l e s w i t c h
thermostat should be fitted so that both the boiler and the
c i r c u l a t i n g p u m p c i r c u i t s a r e e n e r g i s e d u n d e r f r o s t
conditions. A suitable frost thermostat is manufactured by
SOPAC Ltd.
10. Electrical
10
Fig. 10. Wiring Diagram (Standard).
High limit
thermostat
Brown
Green/Yellow
Blue
Brown
Green/Yellow
Blue
Brown
Blue
Green/Yellow
L
E
E
3
1 2 3 4 5 6 7 8
E
9
Brown
5 Amp
Brown
Brown
(C)
(1)
Brown
Green/Yellow
Green/Yellow
Control
thermostat
Mains
supply
230/240V
50Hz
Satronic
control box
Burner
control
Manual reset
overheat
thermostat
Plug-in
connector
1
2
N
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