8
Mexico Super CF 3/100, 3/125, 3/140 -
Installation
GENERAL
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 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:
Table 4 - High and low vent areas
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
CF 3/100
354 (55)
708 (110)
177 (28)
354 (55)
CF 3/125
440 (69)
880 (138)
220 (35)
440 (69)
CF 3/140
485 (74)
970 (148)
243 (37)
485 (74)
Dotted lines indicate flow rates equivalent to a
temperature rise of 11
o
C (20
o
F)
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
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.
THERMOSTATIC RADIATOR VALVES
Caradon Plumbing Ltd.
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.
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
Summary of Contents for CF#/125
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