15
Mexico Slimline RS 3/40 & 3/50 -
Installation
INSTALLATION
13 GRAVITY HOT WATER & PUMPED CENTRAL HEATING
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.
INST
ALLA
TION
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.
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.
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.
1.
Separate flow and return connections are used for each
service. All possible configurations are given in Frame 1 but
ONLY those shown should be used.
2.
The use of a cylinder thermostat is recommended. This will
prevent excessive DHW temperatures and thus reduce gas
consumption.
3.
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.
4.
For each extra elbow in excess of 8, (R) MUST be reduced
by 300 mm (12") or (H) increased by 100 mm (4")
5.
Whatever value is selected for (R) the value of (H) MUST be
at least that indicated by the graph.
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.