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Test water drain while checking the operation sound
of the drain pump motor.
(If the operation sound changes from continuous
sound to intermittent sound, water is normally
drained.)
After the check, the drain pump motor runs,
connecting the float switch connector.
(In case of check by pulling out the float switch
connector, be sure to return the connector to the
original position.)
Single phase
208-240V
Power
terminals
R(L)
S(N)
CN34
White
(RED)
Red
Black
Pull out connector CN34 (Red)
from P.C. board.
Black
Heat insulating
As shown in the figure, cover the flexible hose and
hose band with the attached heat insulator up to the
bottom of the indoor unit without gap.
Cover the drain pipe seamlessly with a heat insulator
locally procured so that it overlaps with the attached
heat insulator of the drain connecting section.
Wrap the attached heat insulator seamlessly
from the surface of the indoor unit.
Heat insulator of the
Heat insulator
drain connecting
(Locally procured)
section (Accessory)
* Direct the slits and seams of the heat insulator
upward to avoid water leakage.
13-EN
5
Refrigerant piping
CAUTION
Use flare nuts that are included with the unit. Using
different flare nuts may cause refrigerant gas
leakage.
Refrigerant piping
Use the following item for the refrigerant piping.
Material: Seamless phosphorous de-oxidized
copper pipe.
6.35, 9.52 and 12.7 wall thickness 0.8 mm or more.
15.88 wall thickness 1.0 mm or more.
REQUIREMENT
When the refrigerant pipe is long, provide support
brackets at intervals of 2.5 - 3 m to clamp the
refrigerant pipe. Otherwise, abnormal sound may
be generated.
CAUTION
IMPORTANT 4 POINTS FOR PIPING WORK
1. Reusable mechanical connectors and flared
joints are not allowed indoors. When mechanical
connectors are reused indoors, sealing parts shall
be renewed.
When flared joints are reused indoors, the flare
part shall be re-fabricated.
2. Tight connection (between pipes and unit)
3. Evacuate the air in the connecting pipes by using
VACUUM PUMP.
4. Check the gas leakage. (Connected points)
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
UP009
UP015
UP024
Model MMU-
to
to
to
UP012
UP018
UP056
Gas side
9.5
12.7
15.9
Pipe size
(Dia. : mm)
Liquid side
6.4
6.4
9.5
– 7 –
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 R32 or R410A refrigerant. The flaring
dimensions for R32 or R410A are different from the
ones used for the conventional R22 refrigerant.
A new flare tool manufactured for use with the
R32 or 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 (Unit: mm)
Outer dia. of
Tool used
copper pipe
6.4, 9.5
0 to 0.5
12.7, 15.9
Flaring diameter size: A (Unit: mm)
Outer dia. of copper pipe
6.4
9.5
12.7
15.9
CAUTION
Do not scratch the inner surface of the flared part
when removing burrs.
Flare processing under the condition of scratches
on the inner surface of flare processing part will
cause refrigerant gas leak.
Check that the flared part is not scratched,
deformed, stepped, or flattened, and that there
are no chips adhered or other problems, after flare
processing.
Do not apply refrigerating machine oil to the flare
surface.
* In case of flaring for R32 or R410A with the
conventional flare tool, pull it out approx. 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 no "whooshing" sound: This is normal and is not
Conventional
tool used
indicative of trouble.
Use two wrenches to connect the indoor unit pipe.
1.0 to 1.5
Work using double spanner
Use the tightening torque levels as listed in the
following table.
+0
A
Outer dia. of connecting
–0.4
9.1
pipe (mm)
13.2
6.4
16.6
9.5
19.7
12.7
15.9
Tightening torque of flare pipe connections.
Pressure of R32 or R410A is higher than that of
R22. (Approx. 1.6 times) Therefore, using a torque
wrench, tighten the flare pipe connecting sections
which connect the indoor and outdoor units of the
specified tightening torque.
Incorrect connections may cause not only a gas
leak, but also a trouble of the refrigeration cycle.
Tightening torque (N•m)
14 to 18 (1.4 to 1.8 kgf•m)
34 to 42 (3.4 to 4.2 kgf•m)
49 to 61 (4.9 to 6.1 kgf•m)
63 to 77 (6.3 to 7.7 kgf•m)
14-EN
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