Modine Manufacturing DBS Installation And Service Manual page 11

INSTALLATION - VENTING
D3. Once the kit contents have been verified as correct for the
direction of venting, the concentric vent adapter box is to
be installed. Determine the location of the box. Be sure to
maintain all clearances as listed in these instructions.
D4. The adapter box is to be mounted on the interior side of the
building. It must not be mounted outside the building. The
adapter box has integral mounting holes for ease of
installation. When horizontal venting multiple units, the
minimum spacing between any sides of the adapter boxes
must be 18" and boxes must not overlap in the vertical
plane (above or below). When condensation may be a
problem, the vent system shall not terminate over public
walkways or over an area where condensate or vapor could
create a nuisance or hazard or could be detrimental to the
operation of regulators, relief openings, or other equipment.
D5. The adapter box can be mounted flush to the wall (for
horizontal kits) or to the ceiling (for vertical kits). The box
can also be offset from the wall or ceiling by using field
supplied brackets. When mounting the box, consider
serviceability and access to the vent and combustion air
pipes. If the box is to be mounted using field supplied
brackets, these brackets must be strong enough to rigidly
secure the box to the wall or ceiling, and should be made
from corrosion resistant material.
D6. Determine the length of the vent pipe and combustion air
inlet pipe for the selected location. THE VENT PIPE WILL
PASS THROUGH THE CONCENTRIC VENT BOX. THE
LAST SECTION OF VENT PIPE IS A CONTINUOUS
LENGTH OF DOUBLE WALL "B" VENT. See section A12
for attaching and terminating double wall pipe. Begin with
pipe lengths on the concentric pipe side of the adapter box
referring to Figure 11.1. These pipes will extend through
the building wall or roof as well as any added length for the
thickness of the wall and the offset from any field installed
brackets.
For Vertical Concentric Vent Kits
(refer to Figure 10.3):
• The bottom of the combustion air intake pipe must
terminate above the snow line, or at least 12 inches
above the roof, whichever distance is greater.
• The bottom of the vent cap must terminate at least 6
inches above the top of the combustion air intake cap.
For Horizontal Concentric Vent Kits
(refer to Figure 10.4):
• The combustion air intake pipe must terminate at least
1 inch from the wall to prevent water from running down
the wall and into the pipe.
• The back of the vent cap must terminate at least 14
inches from the combustion air intake pipe.
D7. Cut the concentric side vent and combustion air pipes to
the proper length as determined in the previous step. Note
that the vent pipe diameter is 4" and the combustion air
intake pipe diameter is 6" for model sizes 75-175, and 6"
and 8" respectively for model sizes 200-400. The pipes
must be single wall galvanized or stainless steel material,
except for the last section of vent pipe, which must be one
continuous length of double wall B-vent extended through
the concentric vent box and combustion air inlet pipe on
the concentric side of the box.
D8. Allow the concentric side vent pipe to pass through the
concentric vent adapter box, as shown in Figure 11.1.
Attach the double wall vent pipe to the single wall vent
pipe that goes to the unit. Be sure to seal the joint and
the open area around the double wall vent. Seal all joints
and seams using sealant suitable for temperatures up to
400°F.
D9. Slide the combustion air pipe over the vent pipe and attach
to the air inlet of the concentric adapter box, as shown in
Figure 11.1, using at least 3 corrosion resistant sheet metal
screws. Seal the joint and seam using sealant suitable for
temperatures up to 400°F.
D10. Place this assembly (the adapter box, vent pipe and
combustion air pipe) through the wall or roof and verify
that the distance requirements as defined in Step D7 are
met. Securely attach the assembly building.
D11. From outside the building, caulk the gap between the
combustion air intake pipe and the building penetration.
D12. Attach the combustion air intake and vent pipe terminations
as follows:
Figure 11.1 - Adapter Box with Combustion Air Intake
Pipe Attached
Outlet Vent
Pipe Extended
Through Box
A
For Vertical Concentric Vent Kits
(refer to Figure 10.3):
• Slide the combustion air cap down over the vent pipe and
fasten it to the combustion air pipe with at least 3
corrosion resistant sheet metal screws.
• Attach the vent cap to the vent pipe using at least 3
corrosion resistant sheet metal screws. Refer to
instruction A12 for connecting terminal to double wall
pipe.
• Caulk the gap between the combustion air cap and the
vent pipe with silicone sealant, or other appropriate
sealants suitable for metal to metal contact and for
temperatures up to 400° F.
For Horizontal Concentric Vent Kits
(refer to Figure 10.4):
• Attach the combustion air intake guard using corrosion
resistant screws at the end of the combustion air intake
pipe to prevent animals and debris from entering.
• Attach the vent cap to the vent pipe using at least 3
corrosion resistant sheet metal screws.
D13. Install vent pipe and combustion air pipe between unit
heater and concentric vent adapter box as outlined in
"Section A – General Instructions – All Units".
D14. Once venting is complete, proceed to the section titled
"Installation - Gas Connections".
5-594.10
Combustion Air
Pipe Attached
4.57"
B
Model Sizes A B
75-175 13.33" 18.84"
200-400 17.00" 15.27"
11