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ing the accepted practice in European countries is detailed in
the June 1995 version of prEN 1020 annex A7 The diameter of
the pipework from the cock to the burner connection must
not be less than the diameter of the burner connection inlet.
(see section 1.15 )
Warning
The installation must be purged and tested for soundness
prior to commissioning. Always ensure that the appropriate
personal protective
equipment is used.
2.7
Electrical Installation/connection
Cabinet heaters are available either for 415V 50Hz 3PH or 230V
50Hz 1PH supplies depending upon the model specified.
It is recommended that reference is made to the wiring
diagrams contained within section 2.11 of this manual prior to
installation or connection to the supply. The electrical supply
must be as specified and suitable for the heater, and must
be run within conduit to a point adjacent to the heater, and
be terminated to provide an isolation point that will prevent
remote or inadvertent activation.
Cables, conduit, and fittings that are used to make the
connection between the isolator and the heater must conform
to the appropriate IEE regulations.
All heaters are supplied fused and pre-wired, all must be
earthed.
Final connections for any additional external controls must be
completed on site, and must be carried out according to IEE
regulations.
Separate user information is provided for the time control unit
and the burner, and forms part of the product information
pack which accompanies every heater when despatched.
Warning
Always isolate from mains electrical supply before
commencing work on the heater. Always ensure that the ap-
propriate personal protective
equipment is used.
2.8
Air Distribution Installation
The materials selected must be of low heat capacity, and it is
preferable that all warm air ductwork is thermally insulated.
Where ducting may be subject to deterioration from exposure
to moisture or high humidity material selection and insulation
are prime considerations. Joints and seams must be airtight
and fastened securely and designed to remain so, even when
operating at high temperatures.
Adequate support must be designed into the layout of the
ductwork to ensure that the integrity of the seams and joints
is maintained. The support must be independent and
separate from the heater and the ducting, to allow for free
movement during expansion and contraction.
Where ducting passes through walls or partitions sufficient
clearance must be left, irrespective of any fire stop
requirement, to allow for expansion and contraction. Failure to
adhere to these latter two points can result in the generation
and transmission of excess noise. Where ducting is installed
in concrete flooring a permanent membrane must be used
to isolate the ducting from the corrosive effect of the alkaline
salts within the concrete. Care should be taken to ensure that
soft insulation material does not become compressed and
thereby lose its insulation
effectiveness.
2.9
Warm Air Registers
In order that vertical temperature gradients are minimal
thereby providing a more even heat distribution, it is
preferable to install warm air registers at low wall levels or at
floor level, with the size, number, and position commensurate
with the requirement of the application.
To minimise noise levels the registers should be set away from
corners, additionally, a good seal between the register frame
and the wall is important, particularly on high level positions,
if unsightly staining through warm air/particulate deposition is
to be avoided.
2.10
Heater Control Installation
Warning
Isolate heater from mains before undertaking any electrical
work.
Unless specified all Cabinet Heaters are manufactured and
supplied with a pre-wired Control panel as standard. Optional
remote controllers are available to be wired back to the
cabinet heater.
Refer to Controller instruction manual for full installation
details.
A commissioning switch is provided on all cabinet heaters
fitted with a remote controller.
See following section for individual wiring diagrams.
Doc No. 20-45-159 Page 23 of 60
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