Modine Manufacturing HDS Installation And Service Manual page 11

D8. 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". Both pipes must be single wall
galvanized or stainless steel material.
D9. Attach the concentric side vent pipe to the vent outlet
of the concentric vent adapter box, as shown in Figure
10.3, using at least 3 corrosion resistant sheet metal
screws. Seal the joint and seam using sealant suitable for
temperatures up to 400°F.
D10. 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.
figure 11.1 - Adapter Box with Combustion Air Intake
pipe Attached
Outlet Vent
Pipe Attached
Combustion Air
Intake Guard
D11. 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.
D12. From outside the building, caulk the gap between the
combustion air intake pipe and the building penetration.
D13. Attach the combustion air intake and vent pipe
terminations as follows:
for vertical Concentric vent Kits
(refer to figure 10.1):
• 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.
• 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 10.2):
• 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.
D14. For model sizes 30 and 45, attach the 3" to 4" vent
transitions on the non-concentric side vent and combustion
air connections using 3 corrosion resistant sheet metal
screws.
D15. Install vent pipe and combustion air pipe between unit
heater and concentric vent adapter box as outlined in
"Section A – General Instructions – All Units".
D16. Once venting is complete, proceed to the section titled
"Installation - Gas Connections".
6" Combustion Air
Pipe Attached
6-584.2
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