Multi F Engineering Manual

Installation and Best Layout Practices
DUCT (LOW STATIC) INDOOR UNITS
Installing the Drain System
• Drain piping must have downward gradient of at least 1/50 to 1/100; to prevent reverse flow,
slope must not be straight up and down.
• Do not damage the drain port on the indoor unit when connecting the field-supplied drain
piping.
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fittings.
Using the Drain Pump
• Maximum drain lift is 27-9/16 inches, therefore, the drain piping must be placed below
the maximum lift height.
• Field-installed drain piping must have downward gradient of at least 1/50 to 1/100; to
prevent reverse flow, slope must not be straight up and down.
Angle ≥ 1/50~1/100
Approx 3/32~5/32 inches
Drain hose
Drain HoleClose Any Gaps
Indoor Unit
Drain Pipe
Insulation
(Field Supplied)
(Field Supplied)
)LJXUHDrain Connection.
Using the Gravity Drain
Field-drain piping must have downward gradient of at least 1/50 to 1/100; to prevent
reverse flow, slope must not be straight up and down.
≤27-9/16 inch
Drain Pipe
1/50~1/1001/50~1/100
Drain Pump
)LJXUHIndoor Unit Using Drain Pump.
)LJXUHIndoor Unit Using Gravity Drain.
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Pour Water
Drain Pump
Drain Pan
Flexible drain hose
(accessory)
Field-Installed
Drain Piping
Glue the Joint
Drain
Port
Drain Hose Connection
Use the clip (accessory)
Indoor Unit
Checking the Drain Pump
The unit uses a drain pump to remove condensate. The pump must be tested before the
system operates.
• Connect the flexible drain hose to the field-installed drain piping; leave it as is until the
test is complete.
• Pour water into the flexible drain hose and check for leaks.
• After power wiring installation is complete, operate the drain pump to see if it sounds
and functions properly.
• After the test is complete, connect the flexible drain hose to the indoor unit drain port.
)LJXUHChecking the Drainage System.
)LJXUHChecking the Drain Pump.
Checking the Drainage System
1. Remove the air filter.
2. Check the drainage.
• Spray water on the evaporator.
• Verify that water flows through the indoor unit drain
hose without leaking.
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on the indoor unit.
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88 | DUCT (LOW STATIC)
Multi F and Multi F MAX Indoor Unit Engineering Manual
MULTI
F
MAX
MULTI
F