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Piping method
The drain pipe and the refrigerant pipe can be connected to left, right, rear or bottom side arbitrarily depending on
the installation location.
Select a set knockout hole referring to the following figure.
For left side
Hole for control wire
Conduit pipe (including the
power supply), drain hose
and refrigerant pipe port
Connecting drain pipe
Insert the drain hose into the connector until the hose can go no farther.
REQUIREMENT
• Connect the hard vinyl chloride pipes by using adhesive agents for vinyl chloride so that water does not leak.
• It takes some time to dry and indurate the adhesive agent. (Refer to the manual of adhesive agent.) Do not apply any
extra force on the connecting section until the adhesive agent is dried.
Check the draining
• In the test run, check that water drain is properly performed and that water does not leak from the connecting
part of the pipes. Check draining also when installed in heating period.
• Remove the cover from the bottom side of the heat exchanger. Pour water to the drain pan. Confirm that water
drains well and does not leak from the drain hose connecting part.
• Once the drain is confirmed, attach back the cover in the way it was.
CAUTION
Water must be poured slowly.
If water is swiftly poured, water may spatter across the inside of the indoor unit. It may cause malfunction of the unit.
13-EN
For rear side
For right side
Conduit pipe (including the power supply),
Hole for control wire
drain hose and refrigerant pipe port
Conduit pipe (including the
Conduit pipe (including the
For bottom
power supply), drain hose
power supply), drain hose
side
and refrigerant pipe port
and refrigerant pipe port
– 7 –
6
Refrigerant piping
CAUTION
When the refrigerant pipe is long, provide support
brackets at intervals of 8'2" to 9'10" (2.5 to 3 m) to clamp
the refrigerant pipe. Otherwise, abnormal sound may be
generated.
Use the flare nut attached with the indoor unit or R410A
flare nut.
Permissible piping length and
height difference
They vary depending on the outdoor unit. For details,
refer to the Installation Manual attached to the outdoor
unit.
Pipe size
Unit: in (mm)
Pipe size
Model MML-
Gas side
UP007 to UP012
3/8" (9.5)
UP015, UP018
1/2" (12.7)
UP024
5/8" (15.9)
Connecting refrigerant piping
Flaring
1
Cut the pipe with a pipe cutter.
Remove burrs completely. (Remaining burrs may
cause gas leakage.)
2
Insert a flare nut into the pipe, and flare the
pipe.
Use the flare nut provided with the unit or the one
used for the R410A refrigerant. The flaring
dimensions for R410A are different from the ones
used for the conventional R22 refrigerant. A new
flare tool manufactured for use with the R410A
refrigerant is recommended, but the conventional
tool can still be used if the projection margin of the
copper pipe is adjusted to be as shown in the
following table.
Projection margin in flaring: B
Outer dia. of
R410A tool used
copper pipe
1/4" to 5/8"
0 to 0.02"
(6.4 to 15.9)
(0 to 0.5)
Flaring diameter size: A
Outer dia. of copper pipe
1/4" (6.4)
Liquid side
3/8" (9.5)
1/4" (6.4)
1/2" (12.7)
1/4" (6.4)
5/8" (15.9)
3/8" (9.5)
A
* In case of flaring for R410A with the conventional
flare tool, pull it out approx. 0.02" (0.5 mm) more
than that for R22 to adjust to the specified flare size.
The copper pipe gauge is useful for adjusting
projection margin size.
• The sealed gas was sealed at the atmospheric
pressure so when the flare nut is removed, there will
be no "whooshing" sound: This is normal and is not
indicative of trouble.
• Use two spanners to connect the indoor unit pipe.
Work using two spanners
Unit: in (mm)
Conventional
tool used
0.04" to 0.06"
(1.0 to 1.5)
Unit: in (mm)
A
+0
–0.02" (0.4)
0.36" (9.1)
0.52" (13.2)
0.65" (16.6)
0.78" (19.7)
14-EN
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