R410A 50Hz Tropical Split AC
5.3 Expelling Air
5.3.1. From the following table, select a method of expelling air.
Table 4:
Length of connective pipe
(single pass)
Less than 5m
5~15m
If the air conditioner is relocated, be sure to use a vacuum pump or refrigerant tank to expel air.
5.3.1.2. Use the refrigerant in the outdoor unit to expel air (see Fig-31 and Fig-32)
Outdoor unit
Stop valve
Screw up the pipe nuts at A, B, C and D completely.
Loosen and remove the square-head cover of valves A and B, rotate the square-head spool of valve B
counterclockwise for 45 degrees and stay for about 10 seconds, and then close the spool of valve B tightly.
Detect leak for all adapters at A, B, C and D. After making sure that no leak exists, open the maintenance
orifice nut of valve A. After all air is expelled, tighten the maintenance orifice nut of valve A.
Open the spools of valves A and B completely.
Tighten the square-head cover of valves A and B completely.
5.3.1.3. Use refrigerant tank to expel air (see Fig.6-8 and Fig.6-9)
Screw up the pipe nuts at A, B, C and D completely.
Loosen and remove the square-head cover and the maintenance orifice nut of valves A and B.
Connect the filler hose of the refrigerant tank with the maintenance orifice of valve A.
Loosen the valve of the refrigerant tank, continue filling refrigerant for 6 seconds to expel the air, and tighten
the nut of valve B quickly.
Loosen the valve of the refrigerant tank again, and fill the refrigerant for 6 seconds. Detect leak for all
adapters at A, B, C and D. After making sure that no leak exists, screw off the filler hose. After all the filled
refrigerant is expelled, screw up the maintenance orifice nut of valve A quickly.
Open the square-head spools of valves A and B completely.
Tighten the square-head cover of valves A and B.
5.3.1.4. Use a vacuum pump to expel the air (Fig-32) (For method of using the manifold valve, see the
operation manual of manifold valve):
138
Use vacuum pump or refrigerant tank.
Air side
A
B
Liquid side
Fig-31
Procedure of expelling air
Use refrigerant in the outdoor unit
Intdoor unit
C
D
pipe adapter
MCAC-UTSM-2012-12