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3.4 Air supply
It is important to ensure that there is an adequate
air supply at all times for both combustion and
heating requirements. Modern constructions involve
the greater use of insulation, improved vapour
barriers, and weather proofing. This practice means
that buildings are sealed much tighter than in the
past.
The combustion air supply for a power vented gas
fired air heater (Type B installation) can be affected
by lack of air supply. Natural infiltration may not be
adequate. Use of extract fans aggravates this
situation. It is important to ensure that there is an
adequate air supply at all times. Reliance on doors
and windows is not allowed. Always ensure that an
adequate inlet for fresh air for combustion is
provided sized to suit the total installation of any
combustion apparatus.
Fit an access guard to the combustion air inlet on
the back of the heater and take appropriate action to
ensure that it remains unblocked. See figure 2c.
WARNING: This model air heater is
installed as a type B application and is
designed to take air for combustion from
the space in which it is installed. Do not
restrict the combustion air intake.
Figure 2c :
Combustion air and flue pipe sockets, Type B
Legend :
1 combustion products flue outlet socket
2 combustion air inlet opening
3 Protection grill (option) (PN 02 25094)
3.5 Air distribution
Follow recommended practice for building air
distribution.
The following notes are of particular importance:
"Where free blowing air heaters are installed it must be
taken into account that heated air is buoyant when it
leaves the appliance, therefore, air patterns within the
space being heated will modify the air throw pattern
achieved.
In building having low heat loss where single heaters
are required to cover a large floor area and in buildings
with high ceiling heights, air re-circulation fans e.g.
Maximizors may be fitted to ensure even heat
distribution and minimize stratification. Care should be
taken to avoid impeding air flow with storage racking,
partitions, etc."
3.6 Electrical supply
Wiring external to the air heater must be carried out
in accordance with the rules if force and by
appropriately qualified persons.
A constant 230 Volt 50 Hertz single phase fused
electricity supply with neutral link is required. All
heaters and controls must be earthed. A lockable
isolator with contact separation of at least 3.0 mm
on all poles should be installed adjacent to the
appliance and within reach of any person working on
the heater.
When a number of heaters are to be connected as
part of a single installation each heater must be
provided with a separate isolator.
The electrical connection to the air heater is at the
back of the appliance. The final connection must be
made in the terminals provided in the control
compartment. Follow the wiring diagram provided
with the air heater.
Electrical supply cable conductor size should be 1.5
mm. Fit the cord grip supplied with the heater. The
length of conductors between the cord grip and the
terminals must be such that in the event that the
cable becomes taut the line conductors do so before
the earth conductor.
3.7 Gas supply
LCSA-4 air heaters are designed to operate on
either natural gas (G20) or propane gas (G31).
Refer to the specifications in section 2 of this
document and to the data plate for details of supply
pressures.
The gas meter and gas service must be checked by
the supply undertaking to ensure that they are
adequate to deal with the total load of all gas fired
apparatus installed.
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