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Amana MSS9 Installation Instructions Manual: General Drain Information; Field Supplied Drain

Single-stage gas furnace.
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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.
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
Drain the furnace and air conditioning coil if applicable, in compli-
ance with code requirements. In horizontal or counterflow installa-
tions, 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 conditioning 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.
and not all hoses will be shipped with all models.
Figure 20
NOTE: Hoses are model specific
100 Degree



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