Refrigerant Piping - Toshiba MMU-AP0094HP-E Manuel D'installation

+001114119501.book Page 37 Wednesday, October 17, 2012 8:23 PM
• 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
220-240 V
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.
73-EN
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6

Refrigerant piping

CAUTION
When the refrigerant pipe is long, provide support
brackets at intervals of 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
AP009 AP015
Model MMU- to to
AP012 AP018
Gas
9.5 12.7
side
Pipe size
(Dia. : mm)
Liquid
6.4 6.4
side
 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 (Unit: mm)
Outer dia. of Conventional
R410A tool used
copper pipe tool used
6.4, 9.5
0 to 0.5 1.0 to 1.5
12.7, 15.9
Flaring diameter size: A (Unit: mm)
+0
Outer dia. of copper pipe A
–0.4
6.4 9.1
9.5 13.2
AP024
12.7 16.6
to
AP056
15.9 19.7
15.9
9.5
* In case of flaring for 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
indicative of trouble.
• Use two wrenches to connect the indoor unit pipe.
Work using double spanner
74-EN