Payne PG9MAB Series A Installation Manual page 44

COMBUSTION AIR
PIPE (NON-DIRECT
VENT/1-PIPE)
VENT PIPE
HORIZONTAL TO ROOF
COMBUSTION AIR
PIPE (NON-DIRECT
VENT/1-PIPE)
VERTICAL TO ROOF
5. Be certain that mating surfaces of inducer housing connection elastomeric (rubber) coupling, and 2-in. diameter vent pipe are clean and dry.
Assemble the elastomeric (rubber) vent coupling (with 2 loose clamps) onto inducer housing connection. Insert the 2-in. diameter vent pipe
through the elastomeric (rubber) coupling and fully into inducer housing connection until it touches a stop inside the inducer housing outlet.
Tighten the screws on both clamps to 15-in-lb. of torque. pipe to inducer housing. Tighten the clamp screws to 15 in.-lb. of torque.
NOTE: Starting at furnace, slope vent pipe a minimum of 1/4-in. per linear ft with no sags between hangers.
CAUTION: UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit component damage.
Vent pipe must be installed and fully seated against inducer housing internal stop. Clamp must be tightened to prevent any condensate
leakage.
6. Install casing hole filler cap (factory-supplied in loose parts bag) in unused vent pipe casing hole.
ATTACHMENT OF VENT EXTENSION PIPE
Furnaces with 100,00 Btuh and larger input are supplied with a PVC vent extension pipe (2-in. diameter by 12-in. long). This pipe has a built-in
channel to assist vent condensate disposal. When this vent extension pipe is supplied, it MUST be used to connect the field vent pipe to furnace
inducer housing on ALL upflow and downflow applications.
NOTE: See label on vent extension pipe for proper installation. This pipe may be shortened if an elbow is used to connect vent extension tube
to field-installed vent pipe.
INSTALLATION GUIDELINES FOR COMBUSTION AIR PIPE AND VENT PIPE
It is recommended that all pipes be cut, prepared, and pre-assembled before permanently cementing any joint.
1. Attach combustion air pipe and vent pipe per instructions in sections "Combustion Air Pipe" and "Vent Pipe."
2. Working from furnace to outside, cut pipe to required length(s).
3. Deburr inside and outside of pipe.
4. Chamfer outside edge of pipe for better distribution of primer and cement.
5. Clean and dry all surfaces to be joined.
6. Check dry fit of pipe and mark insertion depth on pipe.
12 " MIN
COMBUSTION AIR
PIPE (DIRECT VENT
/2-PIPE)
12 " MIN
NOTE: A 12-In. minimum offset pipe section is recommended with
short (5-ft. to 8-ft) vent systems. This recommendation is to
reduce excessive condensate droplets from exiting the vent pipe.
Fig. 40—Short Vent (5 to 8 Ft) System
COMBUSTION AIR
PIPE (DIRECT VENT
/2-PIPE)
COMBUSTION AIR
PIPE (NON-DIRECT
VENT/1-PIPE)
VENT PIPE
HORIZONTAL TO SIDEWALL
VENT PIPE
COMBUSTION AIR
PIPE (NON-DIRECT
VENT/1-PIPE)
VERTICAL TO SIDEWALL
—44—
12 " MIN
COMBUSTION AIR
PIPE (DIRECT
VENT/2-PIPE)
COMBUSTION AIR
PIPE (DIRECT VENT
/2-PIPE)
12 " MIN
VENT PIPE
A05094