Cassette Type Air Conditioner Unit
20
Note:
For the large-sized unit, it has the service port for both the gas valve and the liquid valve. During
evacuation, it is available to connect two hoses of the manifold valve assembly to two service ports to
quicken the evacuating speed.
4.4.2 Additional Charge
Refrigerant suitable for a piping length of 5m is charged in the 18~42k outdoor unit
at the factory, and for 48~60k outdoor unit refrigerant is charged for a piping length of
7.5m.
When the piping of 18~42k unit is longer than 7.0m or the piping of 48~60k unit is
longer than 9.5m, additional charging is necessary.
For the additional amount, see Table 4.5.
Table 4.5
Item
Model
Standard Pipe
Length
Unnecessary Charge
Pipe Length
Additional Refrigerant
Amount for Extra Pipe
18k
5.0m
≤
7.0m
22 g/m
24~36k
5.0m
≤
7.0m
54 g/m
42~48k
5.0m
≤
7.0m
110 g/m
60k
7.5m
≤
9.5m
110 g/m
When the height difference between the indoor unit and outdoor unit is larger than
10 meters, an oil bend should be employed for every 6 meters.
Oil bend
Indoor
Outdoor
6m
(19
-2/
3f
ee
t)
Oil bend
Fig. 4.19
4.5 Installation of the Drain Hose
4.5.1 Installation of Drain Piping
(1).
Keep piping as short as possible and slope it downwards at a gradient of at least
