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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 18~36K outdoor unit at the
factory.
When the piping of 18~36k unit is longer than 7.5m, additional charging is necessary .
For the additional amount, see Table 8.
Model
Item
18K
24~36K
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.
4.5 Installation of the Drain Hose
4.5.1 Installation of Drain Piping
Install the drain hose in accordance with the instructions in this installation manual and keep the
area warm enough to prevent condensation. Problems with the piping may lead to water leaks.
(1). Install the drain hose with downward gradient (1/50 to 1/100) and no risers or traps are
used for the hose.(Fig.23)
(2). Be sure there is no crack or leak on the drain hose to avoid the formation of air pocket.
(Fig.23)
(3). When the hose is long, install supporters.(Fig.24)
(4). Always use the drain hose which has been insulated properly.
Standard Pipe Length
5m
5m
Oil bend
Indoor
Table 8
Unnecessary Charge
Pipe Length
≤ 7.5m
≤ 7.5m
Oil bend
CAUTION!
17
DC Inverter Duct Type Unit
Additional Refrigerant Amount
for Extra Pipe
30 g/m
60 g/m
Outdoor
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