Installation Manual

38 440 01 4501 01
Specifications subject to change without notice.
FURNACE
PIPE DIAMETER
TRANSITION IN
VERTICAL SECTION
NOT IN
HORIZONTAL
SECTION
A93034
Fig. 39 -- Combustion Air and Vent Pipe Diameter Transition Location and Elbow Configuration
Representative drawing only, some models may vary in appearance.
TO CODE--APPROVED DRAIN OR CONDENSA TE PUMP
Recommend “T” fitting with 4--inch minimum height standpipe (A) of same diameter or larger extending upward.
A
A
A
Representative drawing only, some models may vary in appearance.
Tee
Dry Well
Cap
(water tight
and removable)
Tee
Dry Well
Cap
(water tight
and removable)
Tee
Dry Well
Cap
(water tight
and removable)
A170122A
Fig. 40 -- Recommended Combustion Air Inlet Moisture Trap
Recommended Combustion Air Inlet Moisture Trap
Recommended to prevent moisture from trickling into the furnace
vestibule, a trap can be installed in the intake air pipe near the
furnace. To prevent moisture, connecting a drain line to the trap is
recommended as trace amounts of moisture will evaporate into the
intake air stream. If the combustion air inlet is located near a
moisture exhaust duct, or there are other concerns of excessive
moisture being drawn into the combustion air inlet, it is
encouraged to connect a drain line to the trap.
The trap can be constructed from a running tee of the same
diameter of the intake air pipe with EITHER a removable cap
attached to a 6-inch long pipe connected to the tee or the External
Vent Trap Kit to help prevent contaminants from entering the
furnace. See Fig. 40.