Page 18 Reznor, PVE, Installation Manual EN 2019-11, D301113 iss D
Figure 6a : Type B appliance : roof
Figure 6b : Type B appliances : wall
Air supply
When these air heaters are
installed in type B applications,
designed to take air for
combustion from the space in which it is
installed. Do not restrict the combustion
air intake.
It is important to ensure that there is an
adequate air supply at all times for both
combustion and heating requirements.
Modern buildings involve greater use of
insulation, improved vapour barriers, and
weather proofing. These practices mean that
buildings are sealed much tighter than in the
past.
Proper combustion air supply for a power
vented Type B installation requires ventilation
of the heated space. Natural infiltration of air
may not be adequate. Use of exhaust fans
aggravates this situation. It is important to
ensure that there is adequate combustion
air supply at all times. Reliance on doors and
windows is not allowed.
Always ensure that adequate combustion air
is provided to suit the total installation of all
combustion equipment in accordance with
codes of practice and relevant standards, as
appropriate.
Ensure that the air combustion inlet opening
at the top of the unit cannot be obstructed..
Combustion air inlet pipe & flue pipe for
balanced flue installation (type C appliances)
Balanced flue air heaters are designed to
be fitted with a combustion air inlet duct
that obtains outdoor air and a flue pipe that
exhausts flue products to outdoors. Both the
flue and combustion air pipes must be sealed.
Type C2 appliances must not be applied !
