DC Inverter U-match Series Duct Type Unit
18
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). Place back the caps of the liquid valve, gas valve and also the service port.
Hose with the valve pin
gauge manifold
Pressure gauge (Low-pressure)
Pressur
e gauge (Hi-pressure)
Switch (Low-pressure)
Switch (Hi-pressure)
Connection pipe (to indoor unit)
Liquid valve
Gas valve
Service port
Cap
Hose
Vacuum pump
Cap
Service pipe
Cap
Connection pipe
Fig. 4.19
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 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 4.4.
Table 4.4
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 )
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