Toshiba RAS-4M23SAV-E Service Manual page 74

1. Piping connections to the outdoor unit should be
arranged in the sequence A, B, C, D starting
from the bottom.
(For each piping connection, the gas pipe is on
the bottom and the liquid pipe is on the top.)
2. When multiple indoor units are to be connected
to the outdoor unit, make the ends of the pipes
and wires from each indoor unit to ensure that
they will be connected to the outdoor unit
correctly.
(Problems caused by indoor units being con-
nected to the outdoor unit incorrectly are very
common in multiple-unit installations.)
3. The length and height difference of the connect-
ing pipes between the indoor and outdoor units
must be within the ranges indicated below.
• Total piping length :
4 units (A + B + C + D) Multi.
* There is no need to add refrigerant as long
as the length of the connection piping is 40m
or less.
* You will need to add 20 g of refrigerant per
meter of added connection piping for installa-
tions requiring connection piping to be
between 41m to 60m.
• Minimum piping length :
A or B or C or D = 2 m or more
• Maximum indoor piping length :
A or B or C or D = 25 m or less
• Maximum piping height difference :
A or B or C or D = 15 m or less
• Maximum piping/height difference between
2 units = 15 m or less
A
Outdoor
B
Fig. 10-4-7
4. Connect 2 or more indoor units for heat pump.
5. If the outdoor units is to be mounted on a wall,
make sure that the platform supporting it is
sufficiently strong. The platform should be
designed and manufactured to maintain its
strength over a long period of time, and sufficient
consideration should be given to ensuring that
the outdoor unit will not fall.
6. When the outdoor unit is to be mounted high on
a wall, take particular care to ensure that parts
do not fall installer is protected.
C
unit
D
7. When doing installation work on level ground, it
is usual to wiring and piping connections to the
indoor units. And/then make to the outdoor unit.
However if outdoor work is difficult it is possible
instead to make changes to the procedure.
For example by making adjustments to the wiring
and piping length on the inside (rather than the
outside).
How to remove the side panel
1. Remove 3 screws of the side panel.
2. Pull the side panel downward.
Tightening connection
Align the centers of the connecting pipes and
tighten the flare nut as far as possible with your
fingers. Then tighten the nut with a spanner and
torque wrench as shown in the figure.
• Do not apply excess torque.
Otherwise, the nut may break.
Outer dia. of copper pipe
Ø6.35 mm
Ø9.52 mm
Ø12.7 mm
– 74 –
Side panel
Fig. 10-4-8
CAUTION
(Unit : N·m)
Tightening torque
14 to 18 (1.4 to 1.8 kgf•m)
33 to 42 (3.3 to 4.2 kgf•m)
50 to 62 (5.0 to 6.2 kgf•m)