12
Mexico Super CF 3/100, 3/125, 3/140 -
Installation
Boiler size Dim. A
Dim. B
Dim. C
CF 3/100
482(19")
256(10")
28(1
1/8
")
CF 3/125
553(21
3/4
")
256(10")
28(1
1/8
")
CF 3/140
704(27
3/4
")
286(11
1/4
") 57(2
1/4
")
Connections - as viewed at front
Thermostat Position
Back Section
Front Section
CH
DHW
Flow Return
Flow
Return
Top
LH
LH
RH
RH
LH
LH
RH
RH
LH
LH
RH
RH
LH
LH
RH
RH
LH
LH
RH
RH
CF 3/140 ONLY
LH
LH
RH
RH
LH
RH
RH
LH
LH
RH
INSTALLATION
7
PREPARING THE BOILER
Notes
.
•
Before placing the boiler in the selected position any
gas and water connections at the rear of the boiler
should be prepared, due to the possible lack of
access.
•
If an optional Pump Kit is to be used then it must be
fitted at this stage. Refer to separate fitting
instructions included with the kit.
1.
Screw the distributor tube (supplied with a 1" BSP x
28mm copper adaptor) into the selected heating
return tapping, using an appropriate jointing
material.
It is
imperative
that the index mark on the
distributor bush is in alignment with the mark on the
section boss, as shown in Frame 3.
DO NOT disturb it when connecting subsequent
pipework.
Fully pumped systems using more than 1 pump,
serving separate zones, must have a common
return connection to the distributor tube.
2.
Select the desired pumped flow tapping.
3.
Screw the supplied boiler thermostat pocket into the
appropriate front section tapping, using an approved
jointing material. Refer to Tables 5 and 6.
4.
Connect pipe fittings to the rear tappings and plug
any unused tappings.
Note
.
If using iron elbows fit a
short straight connector into the boiler tapping first,
to clear the casing when fitted.
5.
Place the boiler in position.
Note
.
The pump may be
fitted on the FLOW or RETURN.
INST
ALLA
TION
Connections - as viewed at front
Thermostat position
Back Section
Front Section
Flow
Return
Top
LH
LH
LH
LH
RH
LH
RH
RH
RH
RH
LH
RH
CF 3/140 ONLY
LH
LH
LH
RH
RH
RH
Table 5 - Fully Pumped Systems
Table 6 - Gravity Domestic Hot Water & Pumped Central Heating
8
GAS CONNECTION
1.
A MINIMUM working gas pressure of
20 mbar (8 in.w.g.) MUST be available
at the boiler inlet, with the boiler
operating.
2.
Extend a gas supply pipe to the boiler
(for size refer to Table 1 on page 3)
and connect to the gas cock situated at
the front LH side of the boiler.
3.
Test the gas installation for soundness
and purge in accordance with
BS.6891: 1988. Refer to Frame 22.
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