Electrical Supply; Fuel Supply - General - BENSON 30 Installation And Operating Manual

The location must also allow for adequate clearance for the
air supply, return air circulation, gas supply and electrical
supply, whilst also providing good and safe working access.
The heater must be installed on a flat and level surface made
from non-combustible material, which is sufficiently robust
to withstand the weight of the heater and any ancillary
equipment. Any combustible material adjacent to the heater
or flue system must be so placed or shielded so that its surface
temperature does not exceed 65°C.
In areas where it is proposed that more than one heater is to
be installed, a general scheme of circulation should be drawn
up and maintained, thereby offering the best heat distribution
All Gas Fired Cabinet Heaters are fitted with a pressure relief
facility, this is incorporated into the design of the flue gas exit
duct.
Care should therefore be taken in siting service connections
and controls well away from the pressure relief vent.
Warning
Under no circumstances must the pressure relief be
restricted, blocked, or have the free exit of exhaust gas
impaired or re-directed.
1.9

Fuel supply - general

The Gas Fired Cabinet Heater range are all manufactured and
pre-set for use with natural gas or LPG classified under the
categories, based upon the destination of the heater see
section 1.15.1
The heater must be compatible with the gas supply, and each
heater must be installed with a separate approved isolating
gas cock positioned adjacent to and upstream of the union
between the service pipe and the heater.
The gas supplier should have been contacted to confirm that
the supply feed (pipework and metering) is capable of
delivering the required dynamic volume of gas, thereby
ensuring that the minimum burner pressure can be achieved.
Consideration should have also been given to the pressure
drop on single and multiple heater installations, and the affect
that such installations will have upon other plant sharing the
gas supply.
If it is necessary to fit a gas booster, the controls must include
a low pressure cut-off switch which must be fitted on the
supply side of the booster. It is also a requirement that the gas
supplier is contacted prior to the fitting of the unit.
Note
Reference to the Institute of Gas Engineers publication UP-1
and UP-2 together with BS6891 is strongly advised.
Service and Installation pipework must be of a diameter equal
to or greater than the inlet connection on the heater, all joints
must be sealed using an approved sealing compound, and the
system purged and tested for soundness.
1.10

Electrical supply

Wiring external to the cabinet heater must be installed in
accordance with any local, national, and European regulations,
as well as meeting the appropriate requirements of IEE
regulations.
Caution
The means of connection to the main electrical supply must
allow for complete electrical isolation of the heater,
furthermore, in the case of a unit wired for a three phase
supply, the supply should only be used to serve the heater
itself and no other plant or equipment. The position of the
isolation switch must be such that it is adjacent to the heater
and easily accessible at all times. In addition, the isolator itself
must have a contact separation of not less than 3mm. (as per
BS5991 clause 20.2).
The Control fuse ratings are detailed on the appliance data
plate.
Warning
Ensure that the electric and Gas supplies are turned off before
any electrical work is carried out on the heater.
Caution
Ensure that wiring cannot make contact with any surfaces
liable to be subject to high temperatures or where the
insulation of the wiring could be impaired as a result of such
contact.
Warning
All cabinet heaters must be earthed.
Caution
The main electrical supply must not be switched off or
disconnected as a method for stopping the heater, the
exception to this is in an emergency, or during servicing, when
the heat exchanger has been allowed to cool sufficiently to
prevent any damage from occurring. Claims for damage will
not be considered if they have resulted from incorrect wiring
or the incorrect use of the heater.
Doc No. 20-45-159 Page 7 of 60