24
British Gas 440 - 480 RD2 -
Installation & Servicing
INSTALLATION
36 PICTORIAL WIRING
LEGEND
w
white
r
red
bk
black
br
brown
pk
pink
b
blue
gy
grey
V
violet
y/g
yellow/green
35 EXTERNAL CONTROLS
The wiring diagrams illustrated in Frames 37-39 cover the
systems most likely to be fitted to this appliance.
For wiring external controls to the British Gas RD2 boiler,
reference should be made to the system wiring diagrams supplied
by the relevant manufacturer, in conjunction with the wiring
diagrams shown in Frame 33.
Difficulty in wiring should not arise, providing the following
directions are observed:
1. Preferred Wiring Method.
Controls that switch the system on or off, e.g. a time
switch, must be wired, in series and terminate with a volt
free contact across EC1/EC2.
2. Alternative Wiring Method. A switched live supply may be
connected to EC1 (leaving EC2 without connection), which
MUST BE fused at 2A MAXIMUM.
Re: "Note 1."
Volt Free contacts
If switched live is
connected here (EC1)
leave other terminal
without connection. If
programmer is used
here (EC1) and the
switched live MUST BE
FUSED at 2A Max.
IMPORTANT.
A link wire between terminal EC1 and EC2 is not acceptable.
Note.
Route the cable to terminals EC1 & EC2 from the RH rear
of the boiler and across the top of the control box. Refer to
Frame 33. Leave sufficient length of cable to enable it to be
routed as shown once the casing has been fitted and secure
to the casing with the ties provided.
3. Controls that override an on/off control, e.g. frost thermostat
must be wired, in parallel, with the control(s) to be overridden.
Refer to Frame 40.
4. If a proprietary system is used, follow the instructions supplied
by the manufacturer.
Advice on required modifications to the wiring may be
obtained from the component manufacturers.
Notes.
1.
Connection between a frost thermostat and the time control
should be made without disturbing other wiring.
2.
A frost thermostat should be sited in a cool place in the house,
but where it can sense heat from the system.
Preferred Wiring Method.
Alternative Wiring Method.
INST
ALLA
TION