EN
– 8 –
• After the electric work has finished, pour water
during COOL mode operation.
• If the electric work has not yet finished, pull out the
float switch connector (CN34: Red) from the
electrical control box, and check draining by plugging
the single phase 208/230 V power to the terminal
blocks L
1
and L
2
.
If doing so, the drain pump motor operates.
• 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.)
Perform 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
to be procured locally so that it overlaps with the
attached heat insulator of the drain connecting
section.
* Direct the slits and seams of the heat insulator
upward to avoid water leakage.
Heat
exchanger
Drain pan
Float switch
connector (3P)
(CN34: red)
Insert the hose end between the
heat exchanger and the drain pan,
and then bend the hose downward.
Tool for
pouring
water
Bottle
Water (0.4 - 0.5 gal (1500 - 2000 cc))
L
1
L
2
Pull out connector CN34 (Red)
from P.C. board.
CN34
(RED)
Black
Black
Red
White
208/230-1-60
Power
terminals
Wrap the attached heat insulator seamlessly from
the surface of the indoor unit.
Heat insulator of the
drain connecting
section (Accessory)
In
doo
r un
it
Heat insulator
(locally procured)
6
Refrigerant piping and evacuation
Refrigerant piping
1.
Use copper pipe with 0.03" (0.8 mm) or more
thickness.
(In case pipe size is Ø5/8" (15.9 mm),
with 0.04" (1.0 mm) or more.)
2. Flare nut and flare works are also different from
those of the conventional refrigerant.
Take out the flare nut attached to the main unit of the
air conditioner, and use it.
REQUIREMENT
When the refrigerant pipe is long, provide support
brackets at intervals of 8’2” - 9’10” (2.5 - 3 m) to clamp
the refrigerant pipe. Otherwise, abnormal sound may be
generated.
CAUTION
IMPORTANT 4 POINTS FOR PIPING WORK
1. Remove dust and moisture from the inside of the
connecting pipes.
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)
Pipe size
Permissible piping length and
height difference
They vary according to the outdoor unit.
For details, refer to the Installation Manual attached to
the outdoor unit.
Flaring
• Cut the pipe with a pipe cutter.
Remove burrs completely.
Remaining burrs may cause gas leakage.
• Insert a flare nut into the pipe, and flare the pipe.
As the flaring sizes of R410A differ from those of
refrigerant R22, the flare tools newly manufactured
for R410A are recommended.
However, the conventional
tools can be used by adjusting
projection margin of the
copper pipe.
▼
Projection margin in
flaring: B (Unit: in (mm))
Rigid (Clutch type)
▼
Flaring dia. meter size: A (Unit: in (mm))
* 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.
Model
name
MMU-
AP007,
AP009,
AP012
type
AP015,
AP018
type
AP021,
AP024,
AP030,
AP036,
AP042
type
Pipe size
Gas side
3/8"
(9.5 mm)
1/2"
(12.7 mm)
5/8"
(15.9 mm)
Liquid side
1/4"
(6.4 mm)
1/4"
(6.4 mm)
3/8"
(9.5 mm)
Outer dia. of copper pipe
R410A tool
used
Conventional
tool used
R410A
R410A
1/4” (6.4), 3/8” (9.5)
0 - 0.02”
(0 - 0.5)
0.04” - 0.06”
(1.0 - 1.5)
1/2” (12.7), 5/8” (15.9)
Outer dia. of copper pipe
A
+0
–0.02” (–0.4)
R410A
1/4” (6.4)
0.36” (9.1)
3/8” (9.5)
0.52” (13.2)
1/2” (12.7)
0.65” (16.6)
5/8” (15.9)
0.78” (19.7)
B
A
15-EN
16-EN
+00EH99876001-3.book Page 8 Wednesday, May 27, 2015 10:08 AM
