7
GENERAL
Mexico Super CF445 - CF475 -
Installation & Servicing
Boiler
Air from room/internal Air direct from outside
space cm
2
(in.
2
)
cm
2
(in.
2
)
High Level Low Level
High level
Low Level
CF445
174 (27)
348 (54)
87 (14)
174 (27)
CF455
206 (32)
412 (64)
103 (16)
206 (32)
CF465
248 (39)
496 (78)
124 (20)
248 (39)
CF475
284 (44)
586 (88)
142 (22)
284 (44)
CF
465
& C
F 475
CF
465
CF
475
CF 445
& CF455
CF
445
&
CF455
MEX
2216
The central heating system should be in accordance with
BS. 6798 and, in addition, for smallbore and microbore
systems, BS. 5449:1.
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.
Single feed, indirect cylinders are not recommended.
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.
IMPORTANT
A minimum length of 2 metres of copper pipe MUST be fitted to
both flow and return connections from the boiler before
connection to any plastic piping.
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.
If required, a drain tap (not supplied) may be fitted to an unused
bottom (1" BSP) tapping on the front of the boiler.
BOILER CONTROL INTERLOCKS
Caradon Ideal 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.
Central heating systems controls should be installed to ensure the
boiler is switched off when there is no demand for heating or hot water.
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 circuit must
be fitted with an automatic bypass valve to ensure a flow of water
should all 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. For Ireland reference should be made
to the current ETCI rules for electrical installations.
The boiler is supplied for 230 V ~ 50 Hz single phase.
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 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 accessible to the user after installation.
Water Flow Rate and Pressure Loss
Table 4 - High and low vent areas
EFFECT OF AN EXTRACTOR FAN
If there is any type of extractor fan fitted in the premises there is a
possibility that, if an adequate air inlet area from outside is not
provided, spillage of the boiler flue products could occur when
the fan is in operation. Where such installations occur a
spillage test, as detailed in BS.5440-1:2000, MUST be carried
out and any necessary action taken.
VENTILATION IN SERIES
In installations requiring 2 ventilators to be fitted in series, e.g.
across a cavity wall, EACH ventilator should be sized in
accordance with the above data. Where there are more than 2
ventilators in series, EACH should have an area of 50% in
excess of the value quoted above.
WATER CIRCULATION SYSTEM
The boiler is suitable for connection to pumped open vent
central heating systems, pumped central heating combined with
pumped or gravity indirect domestic hot water supply systems
and gravity or pumped indirect domestic hot water supply
systems.
The boiler is NOT suitable for gravity heating systems.
The hydraulic resistance of the boiler at
maximum output
with 11
o
C
(20
o
F) temperature differentials are shown in the following graph:
Dotted lines indicate flow rates equivalent to a temperature rise
of 11
o
C (20
o
F)
200943-1.p65
3/4/2004, 1:58 PM
7
