17
Mexico Super RS440 - RS470 -
Installation & Servicing
INSTALLATION
WARNING:
The appliance MUST be efficiently earthed.
A mains supply of 230 V ~ 50 Hz is required.
The fuse rating should be 3A.
All external controls and wiring MUST be suitable for mains
voltage.
Wiring should be in 3-core PVC insulated cable NOT LESS
than 0.75 mm
2
(24 x 0.2 mm) to BS.6500, Table 16.
Wiring external to the boiler MUST be in accordance with current
l.E.E. (BS.7671) Wiring Regulations and local regulations. For
Ireland reference should be made to the current ETCI rules for
17 ELECTRICAL CONNECTIONS
electrical installations.
Connection must be made in a way that allows complete
isolation of the electrical supply - such as a double pole switch,
having a 3mm (1/8") contact separation in both poles, or a plug
and socket serving only the boiler and system controls.
The means of isolation must be accessible to the user after
installation.
This connection should be readily accessible and be made
adjacent to the boiler (except in the case of bathroom
installations for domestic boilers where the point of connection
to the mains MUST be outside of the bathroom.)
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 tot he 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 24.
Difficulty in wiring should not arise, providing the following
directions are observed:
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 24.
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.
MEX 1926
PCB
Gas valve
Boiler
thermostat
From systems controls
Flow Wiring Diagram
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
200941-1.p65
3/3/2004, 10:25 AM
17
