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General Drain Piping Information
All Gallery and Wall-mounted indoor units generate water during
cooling operation, therefore, properly handling this condensation
must be considered. Gallery and Wall-mounted indoor units apply
the gravity drain method, but a field-supplied condensate pump can
be installed (optional, sold separately). Depending on the location of
the indoor unit, condensation can be drained directly to the outside
of the building, or a common indoor unit drainage piping system can
be installed.
Drain Hose
Gallery and Wall-mounted indoor units have a built-in drain hose.
If necessary, the drain hose can be extended. When the bottom
surface of the indoor unit is at an elevation below the receiving
building drain line connection, install an inverted trap at the top of the
condensate pump discharge riser before connection to the building
drain pipe.
When the receiving drain line is mounted horizontal, connect the
inverted trap to the top half of the pipe. The connection point of the
inverted trap to the building drain pipe should always be to the top
half of the pipe and should never be over 45° either side of the upper
most point of the horizontal building drain line.
If connecting to a vertical drain line or plumbing system vent line,
a vertical drain line include an inverted trap at the top of the IDU con-
Drain Piping
• Drain piping must have down slope (1/50 to 1/100).
• Any holes through the ceilings, walls, etc., must be large enough to
accommodate the drain piping and insulation.
•
•
Drain Leak Test
A leak test should be performed 24 hours after the drainage system
has been installed.
Drain Pipe Insulation
To prevent condensate from forming on the drain piping, field-
supplied 5/16 inch thick polyethylene insulation should be properly
installed.
©
APPLICATION GUIDELINES
General Drain Piping Information
Figure 60: Diagram of an Indoor Unit with a Gravity Drain.
Drain pan
Table 37:
Indoor Unit
SF Frame Gallery
SB Frame Wall-Mounted
SC Frame Wall-Mounted
SV Frame Wall-Mounted
Figure 62: Drain Piping Slope.
Figure 61: Properly Insulating the Drainage Piping.
-
Insulation
Insulation
Not Required
Requir ed
Drain hose
Insulation
Insulation
Drain
Drain Pipe Diameter
Type
(ID, in.)
Gravity
Ø5/8
Connecting
Drain hose
Properly Fitting Insulation
GUIDELINES | 71
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