15
Mexico Super RS 3/100 & 3/125 - Installation
INSTALLATION
14
ELECTRICAL CONNECTIONS
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.
INSTALLATION
13
GRAVITY HOT WATER & PUMPED CENTRAL HEATING
1. Separate flow and return connections are used for each
service. All possible configurations are given in Frame 6
and ONLY those shown should be used.
2. The schematic pipework graph is based on the
assumption that NO MORE than 8 elbows are used in the
gravity loop, including entry to the boiler.
3. For each extra elbow in excess of 8 (R) MUST be reduced
by 300 mm (12") or (H) increased by 100 mm (4")
4. Whatever value is selected for (R), the value of (H) MUST
be at least that indicated by the graph.
(R) = the horizontal distance between the
centre line of the cylinder and the boiler
tappings used - measured along the pipe run.
(H) = the vertical distance between the top of the boiler
and the base of the cylinder.
Notes.
a. Flow and return pipes should rise vertically on
leaving the boiler.
b. Horizontal pipes should be ABOVE ceiling level
and as short as possible.
c. A MINIMUM inclination of 25 mm per 3 m run (1"
per 10') is required to avoid air locks.
If the above conditions cannot be met pumped
primaries should be used.
Wiring external to the boiler MUST be in accordance with
current l.E.E. (BS7671) Wiring Regulations and local
regulations.
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).
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