Mexico:
The Floor Standing Gas Boiler
The Ideal Mexico is a range of cast iron floor standing gas central heating boilers. Both
balanced or conventional flue versions are available. A complete range of both natural
gas and propane models. The range offers Super models and, for when space is tight,
there are Slimline models available.
Mexico: Britain’s biggest selling floor standing boiler
The ideal replacement boiler...
Easy to install, easy to operate and easy to service. The Ideal Mexico really is the
ultimate replacement floor standing range - you can depend on it.
Proven reliability...
Proven cast iron heat exchanger engineered and refined to be the most dependable
floor standing boiler ensuring totally calm operation and quiet running, whatever the
system demands.
Complete range...
27 models, including 4 Slimline models at only 250mm wide and 8 propane Super
models. Option kit availability includes an easy to use programmer kit available on all
models, an overheat thermostat kit for all models and a pump kit that can be housed
within the casing, available for all models except the Super CF 3/140 & CF 3/140P.
Full system suitability...
All models are suitable for connection to pumped open vent central heating systems,
pumped central heating combined with pumped or gravity indirect domestic hot water
supply systems. They can also be used on sealed water systems when used in
conjunction with the optional Overheat Thermostat Kit.
Free Guarantee: 1st Year Ideal Care
The home owner is entitled to 12 months free Ideal Care, which includes both parts
and labour, to restore the boiler to full function. Please encourage the home owner to
complete and return the registration form in their Householder’s pack within 30 days of
installation.
Optional Extra Year Cover with Ideal Care
You may wish to offer your own annual service plan or you may wish to advise the
home owner to complete their application form for the appropriate level of extended
Ideal Care - Silver, Gold or Platinum. Full details are available in the Ideal Care brochure.
CAUTION.
this appliance, care should be taken when handling edges of sheet steel components.
2
To avoid the possibility of injury during the installation, servicing or cleaning of
Mexico Slimline CF 3/40 & 3/50 - Installation
GENERAL
Table 1 - General Data
Boiler Size CF 3/40 CF 3/50
Gas Supply Connection in. BSP Rc 1/2 (1/2)
Flow and Return Connections Rc 1 (1" BSP)
MAXIMUM Static Water Head m (ft.) 30.5 (100) (3 bar)
MINIMUM Static Water Head m (ft.) 1.0 (3.3)
Electrical Supply power consumption 230 V ~ 50 Hz 5W
External Fuse Rating 3 A
Water Content litre (gal.) 20 (4.4)
Dry Weight excluding balanced flue terminal kg. (lb.) 94 (207)
Boiler Size Height mm (in.) 850 (33.5)
Width mm (in.) 255 (10.0)
Depth mm (in.) 535 (21.0)
Gas Type Natural 2 H
Gas Supply Pressure 20 mb
Table 2 - Performance Data
Boiler Size CF 3/40 CF 3/50
Boiler Input MINIMUM kW (Btu/h) 11.3 (38 700) 15.0 (51 100)
Gas Consumption l/s (ft.3/h) 0.29 (37) 0.39 (49)
MID kW (Btu/h) 13.2 (44 900) 17.0 (57 900)
3
Gas Consumption l/s (ft.
/h) 0.34 (43) 0.44 (56)
MAXIMUM kW (Btu/h) 14.9 (50 800) 18.7 (63 700)
3
Gas Consumption l/s (ft.
/h) 0.38 (49) 0.48 (61)
Boiler Output MINIMUM kW (Btu/h) 8.8 (30 000) 11.7 (40 000)
to Water MID kW (Btu/h) 10.3 (35 000) 13.2 (45 000)
MAXIMUM kW (Btu/h) 11.7 (40 000) 14.7 (50 000)
Burner Setting MINIMUM mbar (in w.g.) 6.3 (2.5) 7.8 (3.1)
Pressure (hot) MID mbar (in w.g.) 9.0 (3.6) 10.3 (4.1)
MAXIMUM mbar (in w.g.) 11.2 (4.5) 12.5 (5.0)
Flue gas flow rate (maximum) g/s 7.0 8.8
o
Flue gas temperature
C94 118
*Seasonal Efficiency (SEDBUK) % 70.5 71.4
*The value is used in the UK government's Standard Assessment Procedure (SAP) for energy rating of dwellings.
The test data from which it has been calculated have been certified by BGplc 0087)
Note.
Gas consumption is calculated using a calorific
value of 38.7 MJ/m3 (1038 Btu/ft3) gross or 34.9
MJ/m3 (935 Btu/ft3) nett
To obtain the gas consumption at a different
calorific value:-
a. For l/s - divide the gross heat input (kW) by
the gross C.V. of the gas (MJ/m
3
).
b. For ft3/h - divide the gross heat input (Btu/h)
by the gross C.V. of the gas (Btu/ft3).
Mexico Slimline CF 3/40 & 3/50 - Installation
Key to symbols
GB = United Kingdom IE = Ireland (Countries of destination)
PMS = Maximum operating pressure of water
= An appliance designed for connection to a flue discharging the
B
11BS
products of combustion outside the room, with air for combustion
being drawn directly from the room where the appliance is installed,
without a fan in the combustion products circuit and fitted with a
combustion products discharge safety device.
I2H= An appliance designed for use on 2nd Family gas, Group H only.
3
CONTENTS
Air Supply....................................................................... 7
Boiler Assembly - Exploded view ................................ 9
Mexico Slimline
Mexico Slimline CF 3/40 G.C. No. 41 348 01
Mexico Slimline CF 3/50 G.C. No. 41 348 03
Boiler Clearances .......................................................... 6
Burner Assembly - Exploded view ............................ 34
Electrical Connections ............................................... 15
Electrical Diagrams ..................................................... 15
Electrical Supply ........................................................... 8
Fault Finding ............................................................... 31
Flue Connection .......................................................... 15
Flue Installation ............................................................. 7
Frost Protection .......................................................... 18
Gas Safety Regulations ................................................ 5
Gas Supply .................................................................... 6
Initial Lighting.............................................................. 20
B.G. Certified - P.I. No. 87 AT 15
Destination Countries: GB and IE
Natural Gas only Appliance type: B11 BS
INTRODUCTION
The Mexico Slimline range is of floor standing, conventional
flue gas boilers. They are range-rated to provide central heating
outputs of:
CF 3/40 8.8 kW (30,000 Btu/h) to 11.7 kW (40,000 Btu/h).
CF 3/50 11.7 kW (40,000 Btu/h) to 14.7 kW (50,000 Btu/h).
The boiler has a cast iron heat exchanger and is supplied fully
assembled, complete with a white enamelled mild steel casing.
The boiler thermostat control is located behind the upper front
panel (drop down door).
The boilers are suitable, as standard, for connection to openvented systems ONLY.
The systems may be:
Installation ..................................................................... 9
Mandatory Requirements ............................................. 5
Pump ............................................................................ 13
Servicing ...................................................................... 22
Short List of Parts ....................................................... 32
System Electrical Diagrams ....................................... 17
Thermostatic Radiator valves. ..................................... 8
TTB Thermostat. ........................................................... 7
Water Circulation .......................................................... 7
Water Systems ............................................................ 13
Water Treatment ............................................................ 8
z pumped or gravity circulating indirect DHW only
z pumped central heating only
z pumped central heating combined with either a pumped or
gravity circulating indirect DHW circuit.
OPTIONAL EXTRA KITS
Programmer Kit Fits neatly within the casing. Separate
fitting instructions are included with this kit.
Overheat Available to allow the boiler to be used
Thermostat Kit on sealed water systems.
NOTE TO THE INSTALLER:
LEAVE THESE
INSTRUCTIONS ADJACENT TO THE GAS METER.
ALSO COMPLETE THE BENCHMARK LOG BOOK
AND GIVE THIS TO THE CUSTOMER.
4
Mexico Slimline CF 3/40 & 3/50 - Installation
GENERAL
GAS SAFETY
Gas Safety (Installation and Use) Regulations 1994,
amendments 1996 or rules in force.
It is law that all gas appliances are installed by a CORGI registered
installer (identified by
Failure to install appliances correctly could lead to prosecution. It
is in your own interest, and that of safety, to ensure the law is
complied with.
The installation of the boiler MUST also be in accordance with the
latest I.E.E. (BS 7671) Wiring Regulations, local building
regulations, bylaws of the local water authority, the Building
Regulations and Building Standards (Scotland) and any relevant
requirements of the local authority.
Detailed recommendations are contained in the following British
Standard Codes of Practice:
BS. 6891 Low pressure installation pipes.
BS. 6798 Installation of gas fired hot water boilers of rated
input not exceeding 60 kW.
BS. 5449:1 Forced circulation hot water systems (small bore and
microbore domestic central heating systems).
BS. 5546 Installation of gas hot water supplies for domestic
purposes (2nd Family Gases).
BS. 5440: 1 Flues for gas appliances of rated input not
exceeding 60 kW.
BS. 5440: 2 Ventilation for gas appliances of rated input not
exceeding 60 kW.
BS 7593 Treatment of water in Domestic Hot Water Central
Heating Systems.
) in accordance with the above regulations.
Health and Safety Document No. 635.
The Electricity at Work Regulations, 1989.
Manufacturer’s notes must NOT be taken in any way as overriding
statutory obligations.
IMPORTANT. These appliances are certificated by the British
Standards Institution for safety and performance. It is important,
therefore, that no external control devices, e.g. flue dampers,
economisers etc., are directly connected to these appliances unless
covered by these Installation and Servicing Instructions or otherwise
recommended by Caradon Plumbing Limited in writing. If in doubt
please enquire.
Any direct connection of a control device not approved by Caradon
Plumbing Limited could invalidate the BSI Certification and the
normal appliance warranty. It could also infringe the Gas Safety
Regulations and the above regulations or other statutory
requirements.
LOCATION OF BOILER
The boiler must be installed on a flat and level floor, capable of
adequately supporting the weight of the boiler and any ancillary
equipment.
The boiler may be fitted on a combustible floor.
Insulation is not necessary, unless required by the local authority.
The boiler must not be fitted outside.
The boiler must not be installed in a bedroom or in a room
containing a bath or shower.
1
BOILER WATER CONNECTIONS
1. This appliance is NOT suitable for use
in a direct hot water system.
2. If the boiler is to be used on a sealed
system, an Overheat Thermostat Kit
is available and must be installed in
accordance with the instructions
supplied with the kit.
3. All water connections are Rc1
(1" BSP). The front top and bottom
plugged connections must not be
used. 2 spare blanking off plugs are
provided, in the hardware pack, for
use as necessary in the rear flow or
return water connections.
4. Pipework connections to all systems
may use flow and return connections
on the same side, or opposite sides of
the boiler.
That is:
Fully pumped system
In a fully system, either a LH or a RH flow
connection, together with LH or RH return
connection, may be used.
Gravity domestic hot water and
pumped central heating.
In a gravity DHW and pumped CH
system separate flow and return
connections are used for each service.
The use of a cylinder thermostat is
recommended. This will prevent
excessive domestic hot water
temperatures.
Mexico Slimline CF 3/40 & 3/50 - Installation
5
GENERAL
Timber Framed Buildings
If the boiler is to be fitted in a timber framed building it should be
fitted in accordance with the Institute of Gas Engineering
document IGE/UP/7:1998.
Compartment Installations
A compartment used to enclose the boiler MUST be designed
and constructed specially for this purpose.
An existing cupboard or compartment may be used, providing it
is modified for the purpose.
Details of essential features of cupboards/compartment design,
including airing cupboard installation, are to conform to the
following:
zz
z BS. 6798.
zz
zz
z The position selected for installation MUST allow
zz
adequate space for servicing in front of the boiler
and for air circulation around the boiler.
z This position MUST also permit the provision of a
satisfactory flue and an adequate air supply.
z For the minimum clearances required for safety, and
subsequent service, see Frame 2.
GAS SUPPLY
The local gas supplier should be consulted, at the installation
planning stage, in order to establish the availability of an
adequate supply of gas. An existing service pipe must NOT be
used without prior consultation with the local gas supplier.
The boiler is to be installed only on a gas supply with a
governed meter.
A gas meter can only be connected by the local gas supplier or
by a local regional contractor.
Check that the appliance is suitable for the proposed gas
supply. An existing meter should be checked, preferably by the
gas supplier, to ensure that the meter is adequate to deal with
the rate of gas supply required. A minimum gas pressure of
20mbar MUST be available at the boiler inlet, with the boiler
operating.
Installation pipes MUST be fitted in accordance with BS. 6891.
Pipework from the meter to the boiler MUST be of an adequate
size. Do not use pipes of a smaller size than the boiler gas
connection.
The complete installation MUST be tested for gas soundness
and purged as described in the above code.
2
FLOOR MOUNTING AND BOILER CLEARANCES
Flammable materials must not be placed in
close proximity to the appliance. Materials
giving off flammable vapours must not be
stored in the same room as the appliance.
FLOOR MOUNTING
1. The floor must be flat, level and of
suitable load bearing capacity.
2. The back of the boiler may be fitted
up to the wall.
BOILER CLEARANCES
The minimum overall dimensions of the space in which the
boiler is to operate and to facilitate servicing are as follows:
Boiler Clearances Top One side Aggregate Total
'A' or 'B' 'A' + 'B' Width C
CF 3/40 & CF 3/50 20 (3/4") 25 (1") 100 (4") 350 (14")
IMPORTANT.
A MINIMUM clearance of 25mm (1") MUST also be maintained
between the flue pipe and any adjacent combustible material.
6
In addition a MINIMUM clearance of 533 mm (21") MUST
be available at the front of the boiler, for servicing.
Mexico Slimline CF 3/40 & 3/50 - Installation
GENERAL
FLUE INSTALLATION
The flue must be installed in accordance with the recommendations
of BS. 5440:1.
The following notes are intended for general guidance:
1. The cross-sectional area of the flue, serving the boiler, MUST
NOT be less than the area of the flue outlet of the boiler.
If flue pipe is to be used it MUST NOT be less than the diameter
of the flue outlet connection on the boiler.
2. Flue pipes and fittings should be constructed from one of the
following materials:
a. Aluminium or stainless steel.
b. Cast iron, coated on the inside with acid resistant vitreous
enamel.
c. Other approved material.
3. If twin walled flue pipe is used it should be of a type
acceptable to British Gas.
4. If a chimney is to be used it should preferably be one that is
composed of, or lined with, a non-porous acid resistant
material.
Notes.
Chimneys lined with salt -glazed earthenware pipes are
acceptable if the pipes comply with BS.65 and BS.5440:1.
A flue pipe constructed from one of the materials listed in
2 a-c should form the initial connection to the lined
chimneys.
Where a chimney is to be used that is not composed of, or
lined with, a non-porous, acid resistant material it should be
lined with a stainless steel flexible flue liner which complies
with BS.715.
5. Before connecting the boiler to, or inserting a liner into, a flue
that has been previously used then the flue MUST be
thoroughly swept clean of any soot or loose material. If a
register plate, restrictor plate or damper etc., is fitted in the
flue then it MUST be removed before connecting the boiler
to, or inserting a liner into, the flue.
6. The flue should terminate in accordance with the relevant
recommendations given in BS.5440:1.
7. The flue MUST be fitted with a terminal (or ridge tile up to 5"
flue diameter). The terminal shall be of a type which has
been tested and found satisfactory by British Gas. This
terminal must NOT be installed within 600mm (24") of an
opening window, air vent or any other ventilation opening.
8. The chimney / flue lining MUST be sealed at both the top
and the bottom.
IMPORTANT. It is absolutely ESSENTIAL to ensure, in practice,
that the flue discharge is in a downdraught- free zone and that
products of combustion discharging from the terminal cannot reenter the building or any other adjacent building through
ventilators, windows, doors, other sources of natural air
infiltration or forced ventilation / air conditioning systems.
TTB DOWNDRAUGHT THERMOSTAT
This appliance is fitted with a TTB downdraught thermostat for
added safety and protection. If this thermostat should operate
and switch off the appliance it is because the flue is subject to
downdraught, probably as a result of adverse wind conditions .
The TTB is an automatic reset thermostat which will reset once
the wind conditions have returned to normal, subject to a built-in
reset delay in excess of 10 minutes
The TTB is an important safety device and must not be put out
of action or interfered with in any way.
This device in not a substitute for an independently mounted
carbon monoxide detector.
In cases of repeated or continuous shutdown a competent
person should be called to investigate and rectify the condition
causing this and carry out an operational test after each
intervention on the device. Only the manufacturer's original parts
should be used for replacement.
AIR SUPPLY
Detailed recommendations for air supply are given in
BS.5440:2. The following notes are for general guidance:
1. The room or internal space in which the boiler is installed
MUST have, or be provided with, a permanent air vent. This
vent MUST be either direct to outside air or to an adjacent
room or internal space which must itself have, or be provided
with, a permanent air vent at least the same size direct to
outside air.
The minimum effective area of the permanent air vent(s) are
specified below and are related to maximum rated heat input
of the boiler (see Table 3).
The air vent(s) must NOT have provision for closing or
adjustment and should be sited to avoid risk of accidental
damage or blockage.
If other methods of ventilation are envisaged, British Gas
should be consulted before proceeding.
Table 3
Boiler size CF 3/40 CF 3/50
Effective 38 63
area cm
2. If the boiler is to be installed in a cupboard or compartment,
permanent air vents are required (for combustion, flue
dilution and cooling purposes) in the cupboard /
compartment, at both high and low levels to ensure safe and
efficient combustion and ventilation.
The air vents may either communicate with room/internal
space (appropriately ventilated) or be direct to outside air.
The minimum effective areas of the permanent air vents,
required in the cupboard / compartment, are specified as
follows and are related to maximum rated heat input of the
boiler (see Table 4).
Notes.
a. Both air vents MUST communicate with the same room or
internal space or MUST be on the same wall to outside air.
b. In siting the air vents care must be taken to avoid the freezing
of pipework.
c. Where cupboard / compartment air vents are open to a room
or internal space, the room or internal space MUST itself be
provided with a permanent air vent, as previously specified.
d. The cupboard / compartment air vents must NOT communicate
with a bedroom, bed-sitting room or a room containing a bath
or shower.
Table 4 - High and low vent areas
Boiler Air from room/internal Air direct from outside
CF 3/40 140 (22) 280 (44) 70 (11) 140 (22)
CF 3/50 190 (30) 348 (54) 95 (15) 180 (30)
2
(in.2) (6) (10)
space cm2 (in.2)cm
High Level Low Level High level Low Level
2
(in.2)
Mexico Slimline CF 3/40 & 3/50 - Installation
7
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 must NOT be used for direct hot water supply.
The following indirect open vented systems are suitable:
z Combined gravity domestic hot water (DHW) and pumped
central heating (CH)
z Combined pumped gravity domestic hot water and pumped
central heating.
z Pumped central heating only.
z Gravity domestic hot water only, up to a minimum domestic
hot water cylinder storage capacity of 180 litres (40 gal.)
o
The resistance with an 11
approximately 2 in.w.g. (5 mbar).
Table 5 - Water Flow Rate and Pressure Loss
Boiler size CF 3/40 CF 3/50
Boiler output kW 11.7 14.7
Water Flow l/sec 0.25 0.32
Pressure kPa 0.27 0.40
Loss m 0.027 0.04
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.
C temperature difference will be
Btu/h 40 000 50 000
gpm 3.3 4.2
ft 0.09 0.16
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
nominal size and be in accordance with BS. 2879.
1/2" BSP
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., 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.
8
Mexico Slimline CF 3/40 & 3/50 - Installation
3
BOILER ASSEMBLY - Exploded View
INSTALLATION
INSTALLATION
LEGEND
1. Heat exchanger.
2. Boiler feet assembly.
3. Thermostat pocket.
4. Cleanout cover.
6. Front plate assembly.
9. Main burner.
15. Gas valve.
17. Piezo unit.
Mexico Slimline CF 3/40 & 3/50 - Installation
21. Gas cock.
39. Split pin.
40. Diverter assembly.
41. Flue baffle.
9
4
UNPACKING
To avoid damage to the boiler casing it is
recommended that the casing is removed BEFORE
the boiler body is taken off the pallet.
PACK CONTENTS
z complete boiler assembly
INSTALLATION
z the Hardware Pack (listed separately below)
z these Installation and Servicing Instructions
INSTALLATION
z User's Instructions.
HARDWARE PACK
z 1" BSP plugs - 2 off
complete
boiler
assembly
z Arrow label - 1 off
z Split pin - 1 off
10
Mexico Slimline CF 3/40 & 3/50 - Installation
INSTALLATION
5
BOILER CASING REMOVAL
It is preferable to remove the casing to install the boiler.
1. Lift off the lower front panel.
2. Remove 2 screws and lift off the grille assembly.
3. Remove the gas valve cover by removing the retaining
screw. Disconnect the electrical leads.
4. Remove the 2 screws securing the control panel and
disengage the panel by lowering and pulling it forward.
In order to remove the control panel entirely, the TTB
thermostat has to be carefully released.
5. Remove the 2 screws securing the top panel to the side.
6. Draw the top panel forward and lift it off the boiler.
INSTALLATION
6
CHECKING THE FLUEWAY BAFFLES
1. Remove the flue cleanout cover.
2. Check that the baffle is seated correctly.
7. Remove the 3 screws securing each side
panel to the boiler.
8. Remove the side panel.
9. The boiler is held to the packaging base by 2
M6 hex head screws. Remove the screws and
remove the boiler from the packaging base.
Mexico Slimline CF 3/40 & 3/50 - Installation
11
7
PREPARING THE BOILER
INSTALLATION
Note.
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.
1. Fully pumped systems using more than 1 pump, serving
separate zones, must have a common return connection to
the boiler .
INSTALLATION
2. Select the desired pumped flow tapping.
3. Connect pipe fittings to the rear tappings and plug any
unused tappings.
4. Place the boiler in position.
Note. The pump may be fitted on the FLOW or RETURN.
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 NOT LESS THAN 15mm (
to the boiler and connect to the gas cock situated at the
1/2") OD
bottom LH side of the boiler. Attachment to the gas
supply may be either left or right hand.
3. Test the gas installation for soundness and purge in
accordance with BS.6891: 1988. Refer to Frame 22.
12
Mexico Slimline CF 3/40 & 3/50 - Installation
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