11
540 cm² plus 4.5 cm² per kilowatt in excess of
60 kW total rated input.
(b) High Level (outlet)
(1) for heaters of total rated heat input less than
60kW: 4.5cm² per kilowatt of rated heat input.
(2) for heaters of total rated heat input 60kW or more:
270 cm² plus 2.25 cm² per kilowatt excess of 60kW
total rated input.
4.5 Flue System
A single wall tee piece is supplied with each heater and must
be fitted to the flue outlet socket on the heater. A closed chimney
system that conforms to the requirements of
EN1856-1 and has a designation appropriate to the application
must be connected to the outlet of this tee. The cross sectional
area of the chimney serving the appliance must be not less than
the area of the flue outlet of the air heater. The chimney must
have a minimum height, from the heater to the flue terminal,
of 2m. Horizontal runs of flue are not permitted.
If necessary a single offset using two 45° bends can be included
to avoid obstructions. The maximum equivalent resistance of
the flue system must not exceed 20 pa. Details of how to
calculate the resistance of the flue to be installed are given in
Appendix A.
In order to minimise condensation the use of twin wall chimney
is recommended. Where condensation in the chimney is
unavoidable provision should be made for condensation to flow
freely to a point at which it can be released, preferably into a
gully. The condensation pipe from the chimney to the disposal
point should be of non-corrodible material of not less than
22mm (3/4") size.
Facilities should be made for disconnecting the chimney pipe(s)
from the air heater(s) for inspection and servicing purposes.
It is recommended that consideration be given to the fitting of
a terminal at the chimney flue outlet, however, where the heater
flue is less than 200mm (8") in diameter an approved terminal
must be fitted.
The chimney must terminate in a freely exposed position and
must be situated so as to prevent the products of combustion
entering any opening in a building in such concentration as to
be prejudicial to health or a nuisance..
The chimney must be supported independently of the air heater.
A chimney support bracket that fits directly to the rear of the
heater is available as an optional extra. The chimney terminal
must not be installed so as to be less than:
- 300mm below an opening e.g. window, air brick etc.
- 200mm below eaves or gutter.
- 300mm from an internal or external corner.
- 1200mm from a surface facing the terminal.
- 1500mm vertically from another terminal on the same wall.
- 300mm horizontally from another terminal on the same wall.
- 2000mm from ground level.
4.6 Fuel Connection
4.6.1 Gas Connection (if applicable)
A servicing valve and union must be fitted at the gas inlet to
the heater to facilitate servicing. The gas supply to the air heater
must be completed in solid pipe work and be adequately
supported. Heaters suspended by drop rods, straps or chains
must have a flexible connection as the final link between the
gas supply pipe work and the heater. Sufficient slack must be
left in the connection to take account of normal movement of
the heater.
Warning:
When completing the final gas connection to the heater do not
place undue strain on the gas pipe work of the heater.
4.6.2 Oil Connection (if applicable)
Refer to the supplied burner installation instructions for details
regarding oil supply options.
4.7 Electrical Connections
Wiring external to the air heater must be installed in accordance
with the I.E.E. Regulations for Electrical Installations and any
local regulations which apply. Wiring should be completed in
flexible conduit.
Heaters are for use with 230V, 1N, 50Hz or 400V, 3N, 50Hz
supplies (see heater data plate).
The method of connection to the main electricity supply must:-
- facilitate the complete electrical isolation of the heater(s) t
hat
will prevent remote activation of the heater during servicing.
- be in a readily accessible position adjacent to the heater(s).
- serve only the heater(s).
- have a contact separation of at least 3mm in all poles. See the
accompanying wiring diagram for the heater electrical
connections.
All units are fully prewired and only require final connections
for the incoming mains supply. Heaters not supplied with inbuilt
time and temperature controls will also require completion of
the external control circuit (230V) via a room thermostat, time
clock etc. and, if applicable, the remote low level lockout reset.
All heaters must be earthed.
Reference must be made to Table 3 (Page 7) to ascertain the
electrical loading of the unit(s) being installed so that cables of
adequate cross-sectional area are used for the electrical
installation. The length of the conductors between the cord
anchorage and the terminals must be such that the current
carrying conductors become taut before the earth conductor if
the cable or cord slips out of the cord anchorage. All external
controls must be of an approved type.
Heaters supplied less main fan must be electrically interlocked
to the air movement system so that this is started in the same
manner as the air heater fan would be viz. A connection from
the appropriate heater terminal (see wiring diagram with the
heater) must be made to one side of the fan motor contactor
coil, the other side of the coil being connected to Neutral. Under
no circumstances must the fan motor electrical supply be taken
direct from the internal wiring of the heater.
4.8 Air Distribution System
For free-blowing units used in buildings having a low heat loss
i.e. where single units are required to cover a large floor area,
and in buildings with high roof or ceiling heights Calecon
thermal economiser units should be fitted to ensure even heat
distribution and minimise stratification.
Care should be taken to avoid impeding the heater air throw
with racking, partitions, plant or machinery etc. Various outlet
configurations are available as optional extras to modify the air
throw pattern to suit particular site conditions.
CP-G *D models are designed for use with duct work to more
precisely define the point of air delivery, and /or provide ducted
return air or ducted fresh air inlet. All ducting must be
independently supported of the air heater.
All delivery and return air ducts, including air filters, jointing
and any insulation or lining must be constructed entirely of
materials which will not contribute to a fire, are of adequate
strength and dimensionally stable for the maximum internal
and external temperatures to which they are to be exposed
during commissioning and normal operation.
Where inter-joist spaces are used as duct routes they should be
suitably lined with a fire-resisting material.
A full and unobstructed return air path to the air heater(s) must
be provided.
If the air heater(s) is installed in a plant room the return air
intake(s) and the warm air outlet(s) from the heater(s) must be
fully ducted, into and out of the plant room to avoid interference
with the operation of the heater from other equipment.
The openings in the structure of the plant room through which
the ducting passes must be fire stopped.
Care must be taken to ensure that return-air intakes are kept
clear of sources of smells and fumes, and where there is any
possibility of pollution of the air by dust, shavings etc.,
precautions must be taken to prevent contamination.
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