page no. 18 of 68
LX Range Users, Installation & Servicing Instructions Doc Ref M110 issue 1.0 Dec 2020.
c) In areas subjected to significant negative pressures
due to extract systems.
The heater must be installed in accordance with the
rules in force and the relevant requirements of any
fire regulations or insurance company's requirements
appertaining to the area in which the heater is located,
particularly where special risks are involved.
Where the location of the air heater is such that it might
suffer external mechanical damage e.g. from overhead
cranes, fork lift trucks, it must be suitably protected.
• Where de-greasing solvents are present, even in
minute concentrations.
• Where paint spraying is carried out.
• Where styrenes or other laminating products are used
• Where airborne silicone is present
• Where petrol engine vehicles are stored or maintained
• Where dust is present (i.e. wood working or joinery
shops)
• Where high levels of extract persist.
Installation in such areas may be possible under specific
conditions. Please consult our Technical Department for
further information.
1.3.3. Sizing of the heater
The heater should be correctly sized for the area that it is
heating. Full calculations need to be preformed to ensure
the correct KW output heater is fitted (CIBSE elemental
methodology can be used, or the Powrmatic Technical
Sales can provide guidelines).
1.3.4. Electrical Supply
Wiring external to the heater must be installed in
accordance with the I.E.E. Regulations for Electrical
Installations and any local regulations which apply.
Heaters are supplied by either 230V - 1ph, 50Hz or 415V -
3ph, 50Hz dependent upon the heater size and type.
(see technical data or data plate on heater for exact voltage).
The method of connection to the main electricity supply
must:-
• facilitate the complete electrical isolation of the
heater(s) via a suitable fused isolator that will prevent
remote activation of the heater during servicing (see
section 2.4.5 for ratings).
• 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.
1.3.1. General
Before installation, check that the local distribution
conditions, fuel specification, and adjustment of the
appliance (see data plate) are compatible.
Powrmatic heaters are designed to operate within an
ambient temperature range of -10 to 25°C.
IMPORTANT:
Copper Sulphide / ‘Black Dust’
In some areas of the UK, particularly
Northern Ireland, problems have been
experienced with copper sulphide (more commonly
referred to as ‘Black Dust’) forming on the inner
surfaces of copper gas supply pipework. This dust can
enter the gas stream and may lead to blockages of
valves, filters and injectors.
If this heater is being installed in an area where ‘Black
Dust’ is known to be a problem, and copper gas supply
pipework is used, it is recommended that a filter
having a stainless steel 50 micron mesh and suitable
for Natural Gas is fitted at the inlet to the appliance
immediately downstream of the main appliance
isolation valve. The end user should be advised that the
filter will require periodic cleaning or replacement at
least once per year, during the annual service, or more
often if the problem is severe.
1.3.2 Location
The location chosen for the heater must permit the
provision of a satisfactory flue system and an adequate
air supply. The location must also facilitate ease of
servicing and satisfactory air circulation around the
heater. Consideration should also be given to the throw
characteristics of the heater, issues of public access and
siting of environmental control stations and/or remote
temperature sensors where the position needs to be
representative of the zone temperature to which they
refer.
IMPORTANT:
Heaters shall not be installed in:-
a) Those parts of spaces within buildings
that have been classified as hazardous areas
as defined in BS EN 60079-14.
b) Where there is a foreseeable risk of flammable
particles or gases or corrosion inducing gases or vapours
being drawn into either the heated air stream or the
air for combustion. In such cases installation may only
proceed if both air sources are from an uncontaminated
source, preferably from outside the building. It may
also be necessary to purge the heater before the burner
is allowed to fire. In certain situations where only
airborne particles are present it may suffice to fit filters
on the main air inlet duct of the heater. Advice in these
instances must be obtained from Powrmatic Ltd.
1.3 General Requirements
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