650.75-N4U
035-14370-000
24
Unitary Products Group
VENT TERMINATION
The vent pipe termination must be installed within the allow-
able locations shown in Figure 24 and Section 7.8 in the
National Fuel Gas Code, ANSI Z223.1 (current edition). Fol-
low all local agency and utility requirements if more restrictive
than those shown. Vent termination must be as shown in Fig-
ure 27through Figure 28.
HORIZONTAL VENT APPLICATIONS
If installing a horizontal venting system through any uncondi-
tioned space such as an attic or crawl space, it is recom-
mended, but not required, that a vent drain be added to the
vent pipe to prevent the accumulation of excess condensate
in the inducer motor during operational cycles. (Refer to Fig-
ures 30 and 31).
To install the vent drain, complete the following steps:
1.
Place a tee of the proper diameter for the vent system
being installed (2" or 3") in the horizontal run closest to
the furnace.
2.
Place a reducer bushing of proper diameter in the stem
portion of the tee. The recommended size for the
reducer is 5/8”.
3.
Place a piece of 5/8” diameter or other selected size pipe
a minimum of 3" long into the reducer to serve as a nip-
ple.
NOTE:Tee, reducer and nipple must be properly cemented
together using the appropriate method and materials speci-
fied in the Combustion Air Intake/Vent Connections section of
these instructions.
4.
Connect a piece of flexible drain tubing such as EPDM
rubber, Vinyl or PVC to the nipple.
5.
Loop the drain tubing to provide a trap.
6.
Connect the discharge end of the drain tube to the con-
densate disposal system externally to the furnace.
CONDENSATE PIPING
The condensate drain connection is packed in the furnace for
field installation. It consists of a formed hose with a 1/2” NPT
male connection. A 1/2” FM x 3/4” PVC slip coupling is pro-
vided.
In Canada, refer to CAN/CGA-B149.1 or .2 Installation Code (lat-
est edition - Venting Systems and Air Supply)
FIGURE 30 : HORIZONTAL VENT DRAIN -
UPFLOW MODELS P*UR/FG9-UP/
G9T-UP
FIGURE 31 : HORIZONTAL VENT DRAIN -
DOWNFLOW/HORIZONTAL MODELS
P*DH/FG9-DH/G9T-DH
