Product Overview

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103859-12 - 8/19
MPO-IQ
Installation & Service Manual
Figure 24: Vent Pipe Assembly to Vent Termination
Inner Pipe & Appliance Adapter
G. INSTALLING THE AIR INTAKE PIPING FROM DIRECT
VENT TERMINATION TO BURNER OUTSIDE AIR
ADAPTER
1. Use 4" diameter galvanized single wall vent pipe
and fittings, available at most heating distributors,
to connect burner outside air adapter to Direct Vent
Termination air intake collar.
2. Maximum air intake pipe length is 40 equivalent
feet.
WARNING
DO NOT reduce size of air intake pipe.
3. Start at burner and work towards Direct Vent
termination air intake.
4. Remove burner cover. Loosen two screws securing
outside air duct bracket to burner cover mounting
plate. See Figure 25.
5. Procure a 2-ft section of 4" diameter galvanized
single wall vent pipe, cut off the crimped pipe end
below stop bead.
6. Insert one end of the vent pipe thru the outside
air duct bracket opening and firmly push onto the
outside air adapter collar.
7. Secure the pipe to collar with at least (3) sheet metal
screws (installer provided) evenly spaced around
the collar.
NOTICE It is essential to ensure reliable operation
that combustion air joints are air tight and that VRV is
located as close to the burner as possible.
8. Re-tighten the screws securing outside air duct
bracket to burner cover mounting plate.
9. Install supplied vacuum relief valve tee assembly,
crimped end down, into the opposite end of vent
pipe.
10. Secure the tee to the pipe with at least (3) sheet
metal screws (installer provided) evenly spaced.
11. Remove the vacuum relief valve gate assembly from
the tee.
12. Assemble the vacuum relief valve balance weight
onto the gate. Refer to the vacuum relief valve
manufacturer’s instructions for details.
Figure 25: Oil Burner Installation (Beckett shown)
5 Direct Venting / Air Intake Piping (continued)
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