LAARS Heating Systems
Page 10
OUTDOOR VENT
OUTDOOR
SIZE
TERMINAL
COMBUSTION
AIR TERMINAL
500
20254703
D2007900
750
20254705
D2007900
1000
20254705
D2008000
1250
D2007700
D2008000
1500
D2007700
D2008000
1750
D2007800
D2008000
2000
D2007800
D2008200
Table 6. Vent Terminals for Outdoor Units
cannot be blocked by snow. The National Fuel
Gas Code requires that it be at least 12 inches
(30 cm) above grade, but the installer may
determine it should be higher, depending upon
local conditions.
4.
If the Pennant is side-wall vented to the same
wall, locate the vent terminal at least 3 feet
(0.9m) horizontally from the combustion air
terminal, and locate the vent terminal at least 1
foot (0.3m) above the combustion air terminal
(see Figure 3).
2.3.3 Vertical Vent Terminal
When the unit is vented through the roof, the
vent must extend at least 3 feet (0.9m) above the point
at which it penetrates the roof. It must extend at least 2
feet (0.6m) higher than any portion of a building
within a horizontal distance of 10 feet (3.0m), and
high enough above the roof line to prevent blockage
from snow. When the combustion air is taken from the
roof, the combustion air must terminate at least 12"
(30cm) below the vent terminal (see Figure 2).
2.3.4 Vertical Combustion Air Terminal
When combustion air is taken from the roof, a
field-supplied rain cap or an elbow arrangement must
be used to prevent entry of rain water (see Figure 2).
The opening on the end of the terminal must be at
least 12" (30cm) above the point at which it penetrates
the roof, and high enough above the roof line to
prevent blockage from snow. When the vent
terminates on the roof, the combustion air must
terminate at least 12" (30cm) below the vent terminal.
2.4 Vent Terminals for Outdoor Units
For outdoor applications, the vent and
combustion air openings must be covered with proper
terminals to prevent rain, snow and other objects from
falling into the Pennant.
Part numbers for the terminals to cover the vent
and combustion air openings are shown in Table 6.
Vent opening must be on top of the unit, and the
combustion air opening must be on the back of the
unit. The terminals are connected directly to the unit.
No vent piping is used.
Alternately, the installer may use a short piece of
galvanized single wall or B-vent and an approved rain
cap for the vent termination. A minimum 12" of vent
height is acceptable. In addition, a properly sized
single wall galvanized 90° ell can be used for the
intake air terminal, with the open end of the ell facing
down to prevent rain infiltration. The combustion air
inlet opening must still be high enough to prevent
blockage by snow (see Section 2.3.2).
Summary of Contents for PNCP
Page 30: ...LAARS Heating Systems Page 30 Figure 10 Sheet Metal Components...
Page 31: ...Pennant Pool Heater Page 31 Figure 11 Internal Components...
Page 34: ...LAARS Heating Systems Page 34 Figure 14 Pennant 1250 2000 Ladder Diagram...
Page 35: ...Pennant Pool Heater Page 35 Figure 15 Pennant 500 1000 Wiring Schematic...
Page 36: ...LAARS Heating Systems Page 36 Figure 16 Pennant 1250 1500 Wiring Schematic...
Page 37: ...Pennant Pool Heater Page 37 Figure 17 Pennant 1750 2000 Wiring Schematic...
Page 38: ...LAARS Heating Systems Page 38 Figure 18 Field Wiring...
Page 39: ...Pennant Pool Heater Page 39...