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27
8.0
INSTALLATION
8.9
Making The Electrical Connections
To connect the mains input cable proceed as
follows:-
1. Slacken the facia panel securing screws and lift
the outercase panel so that its securing tabs are
clear of the facia. Remove the panel.
2. Completely undo the screws securing the facia
panel and hinge it down (Fig. 26).
3. Remove the control box cover securing screws.
Disengage the barbs on the control box from the
cover. Remove the cover (Fig. 27).
4. Slacken the cable clamp on the LH side of the
boiler chassis (Fig. 28). Insert the cable through the
clamp and route it to the terminal block.
5. Slacken the screws in the terminal block, connect
the input cable, and tighten the screws.
NOTE:
Both the Live and Neutral connections are
fused.
6. The boiler is fitted with an integral timer. If a room
thermostat is to be connected it can be done at this
point. Run the input cable from the thermostat
through the second cable clamp on the boiler
chassis. Refer to the instructions supplied with the
control.
IMPORTANT:
The room thermostat
MUST
be
suitable for 230V switching.
NOTE:
An external frost thermostat cannot be used
with the integral timer.
7. Remove the link between terminals 1 & 2. The
230V supply at terminal 1 can be connected to the
thermostat. The switched output from the thermostat
must be connected to terminal 2. (Fig. 29). If the
room thermostat being used incorporates an
anticipator it MUST be wired as shown in Fig. 29.
8. Ensure that both mains input and, where fitted,
external control input cables have sufficient slack to
allow the control box to drop down. Tighten the cable
clamp(s) on the boiler chassis.
8.10
Preliminary Electrical Checks
1. Prior to commissioning the boiler preliminary
electrical system checks should be carried out.
2. These should be performed using a suitable
meter, and include checks for Earth Continuity,
Resistance to Earth, Short Circuit and Polarity.
Always fit fast
blow 2A fuse
Fused supply 3A
230V ~ 50Hz
Neutral (blue)
Earth (green/yellow)
Live (brown)
1
2
230V
br
b
g/y
bk
bk
b
br
bk
bk
g/y
1
N
L
Room Thermostat
2
N
230 V
SL
Fig. 28
Fig. 27
Fig. 29
Fig. 26
Terminal Block
Fuses
Cable Clamp
Control Box Cover
Facia Panel
Publication No. 5116282