Lochinvar Power-Fin PF 1500, Руководство дизайнера, Страница: 11 / 32

VENTING OPTIONS
Conventional Vertical Negative Draft
Venting with Combustion Air
Supplied from the Equipment Room
(PF0501-1300 Models - Only)
Units with ON/OFF burner controls may be
vented with Category I, Type "B" vent
material. Only ON/OFF units can be vented
with standard double-wall vent material. The
flue must terminate at the rooftop. Combustion
air is supplied from the equipment room. The
installation of the vent must conform to the
latest edition of the National Fuel Gas Code,
ANSI Z223.1, in Canada, the latest edition
of CGA Standard B149 Installation Code for
Gas Burning Appliances and Equipment. The
vent system must maintain a negative draft
within the specified range of 0.2 to 0.8
inches of water column.
Vertical Negative Draft Venting
with Combustion Air Supplied
from the Equipment Room
(PF0501 - 1300 Models - Only)
Units with Modulating burner controls that can
be vented with a negative draft vent system are
classified as Category II appliances and must
be vented with Category IV corrosion resistant
vent material. The vent connection is made
directly to the back of the unit using an AL29-
4C corrosion resistant vent pipe. The flue must
terminate at the rooftop. Combustion air is
supplied from the equipment room.
Vertical Positive Pressure Venting
with Combustion Air Supplied from
the Equipment Room
(PF1500 - 2000 Models - Only)
Units with Modulating burner controls that use
their internal combustion fan to force the flue
products out the vent system are classified as
Category IV, positive pressure appliances and
must be vented with Category IV corrosion
resistant vent material. The vent connection is
made directly to the back of the unit using an
AL29-4C corrosion resistant vent pipe. The flue
must terminate at the rooftop. Combustion air is
supplied from the equipment room.
The modulation of the burner may result in
flue gas temperatures below dew point
which may form condensate in the flue. The
unit's internal fan generates a positive draft
pressure to exhaust the flue products.
Therefore, materials used for a Category IV
positive pressure vent must be sealed and
corrosion resistant.
L o c h i n v a r
D E S I G N E R
’
S G U I D E P O W E R
-
F I N W A T E R H E A T E R
6 1 5 - 8 8 9 - 8 9 0 0
9
CAUTION!
In cold climates,
flue products will
produce a noticeable
plume. Carefully select
the location of vent caps
for vertical and
horizontal applications.
(FIG. 7) CONVENTIONAL NEGATIVE DRAFT VENTING
(FIG. 9) VERTICAL POSITIVE PRESSURE VENTING
(FIG. 8) VERTICAL NEGATIVE DRAFT VENTING