Refrigerant Piping - Toshiba Carrier MMU-AP0071YHPUL Manuel D'installation

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
208/230V
Power
terminals
(L1) (L2)
CN34
(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.
23-EN
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6

Refrigerant piping

CAUTION
When the refrigerant pipe is long, provide support
brackets at intervals of 8'2.4" to 9'10.1" (2.5 m
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
Pipe size (inch (mm))
Gas side Liquid side
3/8" (9.5) 1/4" (6.4)
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.
– 12 –
Projection margin in flaring: B (Unit: inch
(mm))
Outer dia. of R410A tool Conventional
copper pipe used tool used
0 to 0.02" 0.04" to 0.06"
1/4" (6.4), 3/8" (9.5)
(0 to 0.5) (1.0 to 1.5)
Flaring diameter size: A (Unit: inch (mm))
Outer dia. of copper pipe A +0
–0.02 (–0.4)
1/4" (6.4) 0.35" (9.1)
3/8" (9.5) 0.52" (13.2)
* 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 no "whooshing" sound: This is normal and is not
indicative of trouble.
Use two wrenches to connect the indoor unit pipe.
Work using double spanner
EN
FR
ES
24-EN