8
Mexico Slimline RS 3/40 & 3/50 -
Installation
Table 5 - Water Flow Rate and Pressure Loss
Boiler size
RS 3/40
RS 3/50
Boiler output
kW
11.7
14.7
Btu/h
40 000
50 000
Water Flow
l/sec
0.25
0.32
gpm
3.3
4.2
Pressure
kPa
0.27
0.40
Loss
m
0.027
0.04
ft
0.09
0.16
GENERAL
The resistance with an 11
o
C temperature difference will be
approximately 2 in.w.g. (5 mbar).
The central heating system should be in accordance with
BS. 6798 and, in addition, with BS. 5449:1 for smallbore and
microbore systems.
The domestic hot water system, if applicable, should be in
accordance with the relevant recommendations of BS. 5546.
Copper tubing to BS. 2871:1 is recommended for water
carrying pipework.
The hot water storage cylinder MUST be of the indirect type
and should preferably be manufactured of copper.
The hot water cylinder and ancillary pipework not forming part
of the useful heating surface should be lagged to prevent heat
loss and any possible freezing, particularly where pipes run
through roof spaces and ventilated underfloor spaces.
The flow and return connections to a fully pumped system may
be made either at one side of the boiler or diagonally, to suit
convenience. In a combined pumped heating and gravity
domestic hot water system the gravity flow and return
connections must be made to the same side of the boiler and
the pumped connections to the opposite side.
IMPORTANT
The boiler must be vented. If venting cannot be done via a flow
connection a separate vent MUST be fitted by the installer.
Draining taps MUST be located in accessible positions, which
permit the draining of the whole system - including the boiler
and hot water storage vessel. They should be at least
1/2" BSP
nominal size and be in accordance with BS. 2879.
WATER TREATMENT
The heat exchangers fitted to these boilers have been internally
treated with aluminium paint and only
Fernox Copal
or
Sentinel X100
water treatment products should be used. For
further information on these products contact:
Fernox Manufacturing Co. Ltd.,
or
Sentinel Division
Britannica Works
Betz Dearborn
Clavering
Widnes
Essex
Cheshire
CB11 4QZ
WA8 8UD
Tel: 01799 550 811
Tel: 0151 424 5351
THERMOSTATIC RADIATOR VALVES
Caradon Plumbing Limited
recommend that heating systems
utilising full thermostatic radiator valve control of temperature in
individual rooms should also be fitted with a room thermostat
controlling the temperature in a space served by radiators not
fitted with such a valve, as stated in BS. 5449.
When thermostatic radiator valves are used, the space heating
temperature control over a living / dining area or hallway having
a heating requirement of at least 10% of the boiler heat output
should be achieved using a room thermostat, whilst other
rooms are individually controlled by thermostatic radiator
valves. However, if the system employs thermostatic radiator
valves on all radiators, or two port valves without end switches
then a bypass must be fitted in order to ensure a flow of water
should all the valves be in the closed position.
ELECTRICAL SUPPLY
WARNING.
The appliance MUST be efficiently earthed.
Wiring external to the appliance MUST be in accordance with
the current I.E.E. (BS 7671) Wiring Regulations and any local
regulations which apply.
The boiler is supplied for 230 V ~ 50 Hz single phase.
The fuse rating is 3A.
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.
For bathroom installations the point of connection to the mains
must be situated outside the bathroom.
