DC Inverter U-match Series Floor Ceiling Type Unit
17
During this time, the reading of the pressure gauge at the low pressure side
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 4.4.
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 )
