9
All 90 degree elbows must be medium (1/4 bend DWV)
or long radius (long sweep 1/4 bend DWV) types con-
forming to ASTM D3311. A medium radius (1/4 bend)
elbow is 3-1/16 inch minimum from the plane of one
opening to the centerline of the other opening for 2 inch
pipe (4-9/16 inch for 3 inch pipe).
This furnace must not be connected to any type B, BW,
or L vent or vent connector and must not be vented into
any portion of a factory built or masonry chimney,
except when used as a pathway for PVC pipe as de-
scribed below
Flexible couplings for joining PVC pipe (sometimes
called no hub connectors) have been used by some
installers to connect the field supplied portion of the
vent system to the furnace. Amana Refrigeration, Inc.
does not encourage nor recommend using these con-
nectors. However, if you do choose to use no-hub
connectors, the connectors must be gas tight, water
tight, and able to withstand continuous exposure to the
warm, moist, acidic flue products of the furnace.
It is the responsibility of the installer to follow the manu-
facturers recommendations and to verify that all flue
pipe connectors used are compatible with the furnace
flue products. In addition the connectors must possess
adequate structural integrity to prevent flue pipe sepa-
rations during furnace operation.
V. Vent Piping - GUX (All
Installations), GUC (All Installations),
and GUD (One Pipe Installations)
IMPORTANT:
The length of the vent pipe affects the
performance of the furnace and therefore must be care-
fully sized.
Pipe Diameter for GUC (All Models), GUX (All Models)
and GUD045 (One Pipe) Venting
# of Inside
Elbows
5 to
10 feet
10 to
15 feet
15 to
20 feet
20 to
25 feet
25 to
30 feet
30 to
35 feet
35 to
40 feet
1
2"
2"
2"
2"
2"
2"
2"
2
2"
2"
2"
2"
2"
2"
2"
3
2"
2"
2"
2"
2"
2"
3"
4
2"
2"
2"
2"
2"
3"
3"
Pipe Diameter for GUD070, GUD090 and GUD115
(One Pipe) Venting
# of Inside
Elbows
5 to
10 feet
10 to
15 feet
15 to
20 feet
20 to
25 feet
25 to
30 feet
30 to
35 feet
35 to
40 feet
1
3"
3"
3"
3"
3"
3"
3"
2
3"
3"
3"
3"
3"
3"
3"
3
3"
3"
3"
3"
3"
3"
3"
4
3"
3"
3"
3"
3"
3"
3"
The inside feet of straight pipe and inside elbows repre-
sent the venting system from the furnace to the inside
wall. Follow termination instructions for going from the
inside wall to the outside in the next paragraph.
When the vent pipe goes through an outside wall,
the
vent must terminate at least one foot outside to keep
moist combustion products away from the structure.
The vent termination must be at least three feet above
any forced air inlet located within ten feet. It must be at
least four feet below, four feet horizontally from or one
foot above any door, window, or gravity air inlet into any
building. The vent must terminate at least one foot
above ground level. If heavy snow is expected locally,
this distance may need to be increased. The vent shall
not terminate over public walkways, or over an area
where condensate or vapor could create a nuisance or
hazard or could be detrimental to the operation of regu-
lators, relief valves, or other equipment. Drill a 2-3/8
inch diameter hole through the wall for 2 inch pipe. (For
3 inch pipe, drill a 3-1/2 inch diameter hole.) Cut a piece
of PVC (ABS) pipe that is the thickness of the wall plus
the depth of the sockets of the fittings to be installed on
the inside and outside of the walls. To prevent the vent
pipe from moving and possibly damaging connections,
locate the fitting on the inside wall and a coupling on the
outside wall as shown in Fig. 5. To prevent condensate
from freezing inside the PVC flue pipe in extremely cold
conditions or in long outdoor runs, insulation may be
required on the cut side of the PVC pipe. Use 1/2 inch
thickness closed cell foam insulation such as Armaflex
or Insultube.
