Bryant 926TB Installation, Start-Up, Operating And Service And Maintenance Instructions page 43

Length in Table 16 minus the number of fittings multiplied by the
deduction for each type of fitting used from Table 17.
NOTICE
OPTIONAL CONFIGURATION FOR COMBUSTION
AIR INLET PIPE
In applications where there is a risk of excessive moisture
entering the combustion air inlet pipe, a moisture trap may be
added to the inlet pipe to help prevent moisture from entering
the furnace from the combustion air inlet pipe. See Fig. 43.
When sizing venting systems, the equivalent length of the
optional moisture trap (15 feet/5 M) must be taken into
account.
A
Recommend "T" fitting with 4--inch minimum height standpipe (A) of same diameter or larger extending upward.
Tee
Dry Well
Cap
(water tight
and removable)
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
A
TO CODE- - APPROVED DRAIN OR CONDENSATE PUMP
Representative drawing only, some models may vary in appearance.
Tee
Dry Well
Cap
(water tight
and removable)
Representative drawing only, some models may vary in appearance.
Fig. 43 - - Recommended Combustion Air Inlet Moisture Trap
FURNACE
NOT IN
HORIZONTAL
SECTION
Fig. 42 - - Combustion Air and Vent Pipe Diameter Transition
Location and Elbow Configuration
A
Dry Well
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.
43
PIPE DIAMETER
TRANSITION IN
VERTICAL SECTION
A93034
Tee
Cap
(water tight
and removable)
A170122A