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without placing a base or platform between the
carpeting and the heater. The base or platform may
be made of hollow masonry no less than 102 millime-
ters (mm) thick, covered with sheet metal at 24 gauge
thick. The masonry must be laid with ends unsealed
and joints matched to let air flow from side to side and
through the masonry (see Figure 7).
2E. Combustion and Ventilation Air Supply
All indoor installations must have uninterrupted
openings to outside air for combustion and ventilation.
Table 5 shows the net free opening areas required at
both ceiling and floor for the different heater sizes.
2F. Flue Specifications
2F-1. Outdoor Installation
The LG heater is ready for installation outdoors.
Make sure the installation instructions are followed. If
the installation is in an area that has draught condi-
tions, an outdoor flue terminal assembly, which is
optional, may be obtained from Zodiac Pool Systems,
Inc.
2F-2. Indoor Installation
The LG heater can be installed indoors using the
draught divertor available from Zodiac Pool Systems,
Inc., and a flue system complying with the National
and European Standards in addition to the Building
Regulations (see Section 2).
2F-3. Flue System (Indoor)
Connect the draught divertor to a flue system of
at least the same diameter, and end at least 0.61
meters above the highest point of the roof or other
object that is within 3 meters of the vent. Install a
certified terminal which allows a full equivalent
opening for flue products (see Figure 8). There must
be at least 600mm of vertical flue above the
drafthood. Bends in the flue should not exceed 45° to
the vertical.
To make sure the heater operates safely and
satisfactorily, the flue system must be able to com-
pletely remove combustion products at all times. The
number of bends and lengths of horizontal flue pipe
used should be kept to a minimum in order to reduce
gas flow resistance.
Compliance with the recommendations made in
BS.6644, British Gas publication IM11, Flues for
Commercial and Industrial Gas Fired Boilers and Air
Heaters, and the 1956 Clean Air Act Memorandum,
3rd Edition, should be strictly observed where appli-
cable.
The flue design should avoid the formation of
excessive quantities of condensate. For this reason, it
is recommended that all flues be insulated and lined.
For brick or similar structures, a stainless steel rigid or
flexible flue liner (Grade 304/316) may be used in
conjunction with a 50 mm (minimum) thick layer or
vermiculite or perlite granules between the liner and
the inner skin of the chimney body.
Figure 8. Flue system.
