17
Mexico Super RS485 - RS4125 -
Installation & Servicing
INSTALLATION
MEX 1926
PCB
Gas valve
Boiler
thermostat
From systems controls
Flow Wiring Diagram
G
MEX 2553
r
r
br
b
bk
bk
MAINS SUPPLY
y/g
b br
br
y/g
y/g
b
bk
Ignition/
Detection
electrode
Burner
On
neon
w
w
Control
thermostat
Gas valve
L
H
L
G
N L
18 INTERNAL WIRING
19 EXTERNAL CONTROLS
External wiring must be in accordance with the current I.E.E.
(BS 7671) Wiring Regulations. For Ireland reference should be
made to the current ETCI rules for electrical installations.
The wiring diagrams illustrated in Frames 21-23 cover the
systems most likely to be fitted to this appliance.
For wiring external controls to the
Mexico Super 4 RS
boiler
reference should be made to the system wiring diagrams
supplied by the relevant manufacturer, in conjunction with the
flow wiring diagram below and also Frame 18.
Difficulty in wiring should not arise, providing the following
directions are observed:
1.
Remove the securing screw and lift off the
control box cover.
2.
Route the electrical leads into the box and
wire into the terminal strip, as shown.
Notes.
a.
Secure each lead with one of the cable
clamps.
b.
The mains lead connection MUST be made
so that, should the lead slip from its
anchorage, the current conductors become
taut before the earthing conductor.
Flow and pictorial wiring diagrams are shown in
Frames 19 and 20.
1.
Controls that switch the system ON and OFF, e.g. a time
switch, MUST be wired, in series, in the live mains lead to
the boiler.
2.
Controls that override an on/off control, e.g. a frost
thermostat, MUST be wired into the mains lead, in parallel,
with the control(s) to be overridden. Refer to Frame 25.
3.
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.
Note.
If there are no external controls the circulating pump
MUST be wired into the control box.
INST
ALLA
TION
200942-1.p65
3/4/2004, 9:24 AM
17
