22
Multi F Ceiling Cassette Indoor Unit
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MAX
MULTI
F
MULTI
F
Installing the Drain System
•
The unit uses a drain pump with a height of up to 27-9/16 inches
to remove condensate from the indoor unit to the drainage
system. To ensure proper drainage, the flexible drain piping and
any field-supplied drain piping should be installed below the
maximum height.
• Field-supplied drain piping must have downward gradient of at
least 1/50 to 1/100; to prevent reverse flow, slope should not be
straight up and down.
•
Do not damage the drain port on the indoor unit when con-
necting the flexible drain hose or field-supplied drain piping.
•
Drain piping specifications:
- Indoor Unit Drain Connection (Flexible Drain Hose): 1-1/4 inch
outside diameter.
The supplied flexible drain hose should not be installed with a sharp
curve or twist. A curved or twisted hose may become damaged due to
vibration and / or leak.
- Field-Supplied Drain Piping: Polyvinyl chloride piping with 1-inch
inside diameter and pipe fittings.
Condensate can be drained either directly outside or to a common drain system. For more information regarding the common drain system, see the
Multi F / Multi F MAX Outdoor Unit Engineering Manual
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)
Checking the Drain Pump
The drain pump must be tested before the system operates.
•
Connect flexible drain hose to the field-supplied 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.
Clamp the Flexible Drain Hose Connection
Maintenance
Drain Port
Routing Up
Not Permitted
Metal Clamp
Indoor Unit
Piping Dia.
(Inch)
Ø3/4" ~
1-1/2"
Ø1-1/2"
~ 2"
Ø2-1/2"
~ 5"
Maximum
Interval
(feet)
<3.3
<3.9
<4.9
Figure 14: Correct (Another View) and Incorrect
Drain Slopes.
Figure 15: Flexible Drain Hose
Connection.
If the field drain piping and / or the common drain sys-
tem is long, it is recommended that clamp hangers be
installed for support.
Table 12:
Recommended Drain Piping Support Intervals.
GENERAL INSTALLATION GUIDELINES
Installing Drain System
Figure 16:
Checking the Drain Pump.
1/50~
1/100
<27-9/16 inches
Figure 12:
Ceiling Cassette Indoor Unit Drain System.
Flexible Drain Hose
(Factory Supplied)
Drain pump
PVC Elbow
(Field
Supplied)
PVC Piping
(Field Supplied)
Maximum
27-9/16 inches
≤
11-13/16 inches
Common Drain Pipe
Figure 13: Drain Slope.
Note:
Note:
