General Drain Information; Field Supplied Drain; Upflow Model Installed Vertically - Goodman GMSS96 Installation Instructions Manual

• The drain trap supplied with the furnace must be used.
• The drain trap must be primed at time of installation.
• The drain line between furnace and drain location must meet local and nation codes.
• The drain line between furnace and drain location must maintain a 1/4 inch per foot downward slope toward the drain.
• Do not trap the drain line in any other location than at the drain trap supplied with the furnace.
• If the drain line is routed through an area which may see temperatures near or below freezing, precautions must be
taken to prevent condensate from freezing within the drain line.
• If an air conditioning coil is installed with the furnace, a common drain may be used. An open tee must be installed in
the drain line, near the cooling coil, to relieve positive air pressure from the coil's plenum. This is necessary to prohibit
any interference with the function of the furnace's drain trap.
NOTE: In vertical installations, air conditioning coil condensate may drain into the furnace trap as long as there is a trap
between the coil and the furnace trap and the drain pipe is not terminating below the water level of the furnace trap.
G D I
ENERAL RAIN NFORMATION
All furnace models come with a factory installed drain trap. For vertical installations, the trap will remain in the factory
position except for a counterflow when the installer desires the drain to exit the right side. All furnace models installed
horizontally require the trap to be relocated. Many drain hoses have a built–in grommet which will provide a cabinet seal
when installed. See instructions below for your model and installation position. NOTE: Both sides of the drain trap must be
primed prior to initial furnace start up
F S D
IELD UPPLIED RAIN
Drain the furnace and air conditioning coil if applicable, in compliance with code requirements. In horizontal or counterflow
installations, a field installed rubber coupling will allow the drain trap to be removed for cleaning. The drain trap must be
primed before initial furnace start up. When an air condition-
ing coil drain is connected to the field supplied furnace drain,
it must be vented. An open tee must be installed at a height no
higher than the bottom of the furnace collector box to prevent
air conditioning condensate from backing up into the furnace,
if the common drain was blocked.
U M I
PFLOW ODEL NSTALLED
The trap and factory installed hoses remain as shipped. The
furnace drain may exit either the right or left side of the fur-
nace cabinet. Both sides of the cabinet have two .875" diam-
eter holes which can be used interchangeably for drain and low
voltage wiring purposes. If a higher drain exit is needed, a
.875" diameter hole may be added in the area shown in Figure
21. Any unused cabinet opening must be sealed. Do not allow
drain hose to sag or trap water.
Acceptable
area for
drain hole.
12"
3"
V
ERTICALLY
Side Cut-Out
Right side shown.
Figure 21
#2
#1
#4
#7
#9
NOTE: Hoses are model specific
and not all hoses will be shipped with all models.
19
#5
#8
Coupling
#10
100 Degree
Elbow
#11
Figure 20