40
MUL
TI V Ceiling Cassette Indoor Units
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Condensate Drain Piping
Installation
• Drain piping must slope down 1/50 to 1/100 or flow will reverse
back to unit.
• Any holes through the ceilings, wall,s etc., must be large enough to
accommodate the drain piping and insulation.
• Refer to the table on the previous page for drain pipe sizing.
• During drain piping connection, be careful not to exert extra force
on the drain port on the indoor unit.
• Use polyvinyl chloride pipe.
1.
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so that the pipe will slope downward from the indoor unit to its end
drain location.
2. Connect the provided flexible drain pipe to the main drain pipe.
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3. Pour water into the flexible pipe as shown in the figure at right to
test for leaks. Repair leaks if necessary.
4. Route the flexible drain pipe to the indoor unit and connect the
flexible drain pipe to the drain port of the indoor unit.
5. Install field-supplied polyethylene foam insulation 5/16 inch thick
or greater on the flexible drain pipe, and position snugly against
indoor unit.
Figure 30: Drain Piping Slope.
Pour water to
test for proper
drainage and
no leaks
Drain Pump
Drain pan
Flexible drain hose
Main drain pipe
Glue the joint
Drain
port
Drain hose clip (provided)
Flexible drain hose
Figure 31:
Do Not Sharply Bend the Drain Pipe.
Figure 32: Testing the Drain Pipe.
Maintenance
drain port
Upward
routing
not allowed
Pipe clamp
Indoor unit
GENERAL CONDENSATE PIPING
