Space-Ray LRDL15, Assembly, Installation And Operation Instructions

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Form #44201117
Dec 2021
-33-
VENTILATION BY NATURAL AIR CHANGE
Gas-fired radiant heaters may be operated without any special exhaust system if the exhaust gases are
discharged to the outside atmosphere by a sufficient natural air change in the installation room.
Furthermore, no provision for thermal or mechanical ventilation is required in the following particular cases:
Buildings with natural air change greater than 1.5 volumes per hour
Buildings with a density of operating heat input not greater than 5W/m
3
AIR SUPPLY
Air supply openings are required to admit air and shall be located below the radiant heaters.
The total area of the unobstructed cross-sections of all the air supply openings shall not be smaller than the total
area of the unobstructed cross-sections of all the exhaust openings.
Slits and gaps of fixed cross-section can also be used as air supply openings.
Where the air supply openings can be closed, it shall only be possible to operate the radiant heaters when they
are open.
B.
FLUED
If the appliance is to be flued externally, then flue pipe of diameter stated in Table 13 should be used. The flue
pipe must comply with National and Local Regulations.
IMPORTANT: When flued horizontally, the flue pipe must be arranged to provide a continuous rise from the
appliance of 25mm per 1m length.
The ventilation requirements for flued appliances are set out in BS 6896 (latest edition) and must be applied. In
buildings having a design air change rate of less than 0.5/h additional ventilation is required. These
requirements only apply to type B systems. The following is guidance to the standard:
NATURAL VENTILATION
Low level ventilation openings shall be provided with a free area of at least 2cm
2
/kW. E.g. below the level of the
heater(s).
Where the air supply openings can be closed, it shall only be possible to operate the radiant heaters when they
are open.
MECHANICAL VENTILATION
Sufficient ventilation air shall be provided to ensure that the building air change rate is at least 0.5/h.
C.
FLUE AND COMBUSTION AIR CONFIGURATIONS
The heaters can be installed with different flue and combustion air configurations please review the diagrams on
the following page for the overview of the permitted installations. The permissible maximum lengths associated
with these options are listed in the table below.
Table 13
Flue
Type
Max
Combustion
Air 100mm
Ø
Max Flue
Length
150mm
Ø
Max length
combined
combustion air
and flue Reduce length for
90
°
bends 100 and
150mm
Ø
A
2
15m N/A 15m -1.7m
B
22
13m 15m 28m -1.7m
C
52
13m 15m 28m -1.7m
Note
1
: first length is parallel section second length is concentric section.