Sterling GG - Manual (Page 27)

27
VENTING (continued)
NOTICE: Every Separated Combustion unit to be installed MUST use the Factory available Combustion Air
Inlet Kit. See installation instructions included with kit for complete list of instructions. If you do not have
this kit, contact the manufacturer ASAP to obtain one prior to installation.
AIR INLET COLLAR
Remove screen and mounting plate from air inlet on
rear panel of unit by removing 4 screws. Secure inlet
collar and gasket to inlet opening re-using the 4 screws
removed in previous step.
EXHAUST AIR COLLAR
Secure 5-4 inch reducer to fl ue collar on rear panel of
unit sizes 090, 105 and 120. Seal per exhaust venting
instructions.
VERTICAL TERMINATION
Select location on roof for vent terminal, ensuring
adequate space inside the building/structure for
combustion air inlet box. Terminal must be at least
10 feet (3.04m) from any wall or adjoining building. See
Figure 19 and Table 4.
Cut a hole through the roof for combustion air pipe.
Combustion air inlet box is to be suspended from the
underside of the roof using suitable brackets (field
supplied). Before mounting box, cut a length of 6 inch
(152mm) (sizes 030-075) or 8 inch (203mm) (sizes 090-
120) pipe so that dimension A, Figure 19, is equal to the
dimension from the top of the box to the roof surface plus
2 feet (0.61m), plus expected snow depth. Fasten pipe to
combustion air inlet connection of combustion air inlet
box and seal joint. Insert pipe through roof and fasten
vent box in place. Flash and/or caulk pipe to roof. Install
inlet air screen assembly and fasten to pipe with screws.
Insert a 5 foot length of UL 1738 listed metal vent pipe
through the combustion air inlet box opening (detail A,
Figure 18) with the “UP” arrow pointing up. Position the
pipe to extend 12 inches beyond the inlet air screen.
Seal the space between the vent pipe and opening of
the combustion air inlet box using high temperature
silicone sealant. Install defl ector disk on UL 1738 listed
metal vent pipe 2-1/2 inches above inlet air screen and
fasten with screws. Seal joint between deflector disk
and pipe with silicone sealant. Install vent terminal on
top of UL 1738 listed vent pipe, fasten with screws and
seal joint.
Connect flue pipe and combustion air pipe from
combustion air inlet box to unit. Joint between double
wall vent pipe and single wall vent pipe must be sealed
with high temperature silicone sealant. Collars on unit
and on combustion air inlet box are sized so that crimped
ends of combustion air pipes go toward the unit and
crimped ends of fl ue pipes go away from the unit.
HORIZONTAL TERMINATION
Select a location on outside wall for vent terminal.
In most applications, the terminal should be on level
with the flue outlet of the unit less a 1/4 inch per foot
pitch for condensate drainage toward the outside of
the building. See Figure 20 and Table 4 for terminal
clearance.
Cut a hole through the wall for a 6 inch (152mm) sizes
(030-075) or 8 inch (203mm) sizes (090-120) combustion
air pipe. Install thimble if required by local codes or type
of wall construction.
Combustion air inlet box may be fastened directly to wall
or spaced away from wall using suitable brackets (fi eld
supplied). Cut a length of pipe so that it will protrude
4 inches (102mm) through the wall when the box is
mounted in position. Fasten pipe to box with sheet metal
screws, using at least three screws per joint. Seal joint
with high temperature silicone sealant.
Insert pipe through wall and fasten adapter box in place
so that the pipe pitches downward 1/4 inch per foot
(21mm/m) toward the outside. Flash and/or caulk pipe
on outside wall. Install inlet air screen assembly and
fasten to pipe with screws. Insert a continuous length
of 4 inch (sizes 030-075) or 5 inch (sizes 090-120) UL
1738 listed vent pipe through the combustion air inlet
box opening (detail A, Figure 18). Position the pipe to
extend a minimum 12 inches beyond the inlet air screen.
Seal the space between the vent pipe and opening of the
combustion air inlet box using high temperature silicone
sealant. Install deflector disk on UL 1738 listed metal
vent pipe 2-1/2 inches (63.5mm) from inlet air screen
and fasten with screws. Install vent terminal on end of UL
1738 listed vent pipe, fasten with screws and seal joint.
Connect flue pipe and combustion air pipe from
combustion air inlet box to unit. Joint between double
wall vent pipe and single wall vent pipe must be sealed
with high temperature silicone sealant. Collars on unit
and on combustion air inlet box are sized so that crimped
ends of combustion air pipes go toward the unit and
crimped ends of fl ue pipes go away from the unit.
SEPARATED COMBUSTION