7
3. Installation Process
3-1.
Embedding the Tubing and Wiring
●
Do not connect tubes to locations that are embedded.
●
Be sure to bind refrigerant tubing and inter-unit cables
together with vinyl tape.
●
The power cable must be obtained on-site.
(
φ
2.0: Less than 15 m /
φ
2.6: Less than 20 m /
φ
3.5: Less than 26 m)
●
Be sure to apply the provided labels to both ends of
the inter-unit cables to prevent miswiring.
●
Securely seal the end of embedded tubing with vinyl
tape in order to prevent dirt or moisture entry.
●
In order to prevent insulation breakdown and ground
faults, do not allow the wire ends to contact rainwater,
or be subject to dew condensation.
3-2.
Installing Outdoor Unit
(1) Select a location for installing the outdoor unit.
(Refer to 2-2. Outdoor Unit.)
(2) The connection valves are stored inside the unit.
Remove the inspection panel and remove the cable
fasteners. (To remove the inspection panel, remove
the 3 screws, then push the panel down and pull it
toward you.)
(Refer to 2-4. Diagram of Outdoor Unit Installation.)
(3) Remove the tubing panel in order to attach covers as
needed, according to the number of indoor units.
(Refer to 2-4. Diagram of Outdoor Unit Installation.)
Be sure to prepare special R410A-type tubes (wall thick-
ness 0.8 mm except
φ
12.7 tube. For
φ
12.7 tube, wall thick-
ness should be 1.0 mm) as shown in the table at right.
3-3. Use of the Flaring Method
Many conventional split system air conditioners employ
the flaring method to connect refrigerant tubes which run
between indoor and outdoor units. In this method, the cop-
per tubes are flared at each end and connected with flare
nuts.
3-4. Flaring Procedure with a Flare Tool
●
For creating the flare, use the special R410 flare tool.
The previous (R22) flare tool may also be used. (Fig. 9)
(1) Cut the copper tube to the required length with a
tube cutter. It is recommended to cut approx. 30 –
50 cm longer than the tubing length you estimate.
(2) Remove burrs at the end of the copper tube with a
tube reamer or file. This process is important and
should be done carefully to make a good flare. (Fig. 7)
Model
Narrow Tube
Wide Tube
28– 50
φ
6.35 mm (1/4")
φ
9.52 mm (3/8")
70
φ
6.35 mm (1/4")
φ
12.7 mm (1/2")
Deburring
Before
After
Fig. 7
Table 4
