7B-21 Air Conditioning System:
b) Replace empty container with a refrigerant 8) After the system has been charged with specified
container which has been charged with amount (370 ± 20 g) of refrigerant or when low
refrigerant. When using refrigerant container tap pressure gauge (1) and high pressure gauge (2)
valve (2), use the following procedure for have indicated the following specified value, close
replacement. low pressure side valve (3) on manifold gauge set
i) Retract needle (3) and remove refrigerant
(4).
container tap valve by loosening its plate nut
Low side and high side pressure example
(4).
Gauges should read as follows when ambient
ii) Install the refrigerant container tap valve to a
temperature is 30 °C (86 °F).
new refrigerant container.
Pressure 1240 – 1520 kPa
on high pressure gauge 12.4 – 15.2 kg/cm
2
176 – 216 psi
Pressure 250 – 360 kPa
on low pressure gauge 2.5 – 3.5 kg/cm
2
35.6 – 51 psi
4
2
1
3
I2RH01720018-
c) Purge any air existing in center charging hose.
When using refrigerant container tap valve, use
the following procedure to purge air.
i) Once fully tighten refrigerant container tap
valve (1), and then loosen (open) plate nut
(2) slightly.
ii) Open low pressure side valve (3) of manifold
gauge set (4) a little.
iii) As soon as refrigerant comes out with a
“hiss” through a clearance between
refrigerant container and tap valve, tighten
plate nut as well as low pressure side valve. I4RS0A720016-
iv) Turn handle of tap valve clockwise so that its
needle is screwed into the new container to
Removal of Manifold Gauge Set
make a hole for refrigerant flow.
WARNING:
High pressure side is under high pressure.
Therefore, be careful not to get injured
especially on your eyes and skin.