Nortek GKU18USV4DH, Инструкция по установке и руководство пользователя

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DC Inverter U-match Series Cassette Type Unit
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can not be larger than 0.005MPa (0.72psig).
(7). Slightly open the liquid valve and let some refrigerant into the connection
pipe to balance the pressure inside and outside of the connection pipe, so
that air will not come into the connection pipe when removing the hose.
Note that the gas and liquid valve can be opened fully only after the
manifold valve assembly is removed.
(8). Replace the caps of the liquid valve, gas valve and service port.
Fig. 4.17
Note: For the large-sized unit, it has the service port for both the gas valve and the liquid valve.
During evacuation, it is possible 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 7.6m (25feet) is charged in the outdoor
unit at the factory. When the piping is longer than 7.6m (25feet), additional charging
is necessary.
For the additional amount, see Table 4.6.
Table 4.6
Item
Model
Additional Refrigerant Amount for Extra Pipe
18k 45g per 1.5m (1.6 ounce per 5 feet )
24k~48k 90g per 1.5m (3.2 ounce per 5 feet )