19
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Installation (Cont.)
Proceed as illustrated in Fig. 19 and Fig. 20 below:
• Unscrew and remove the caps from the 2-way and 3-way valves.
• Unscrew and remove the cap from the service port.
• Connect the vacuum pump hose to the service port.
• Operate the vacuum pump for 10 - 15 minutes until an absolute vacuum
of 10mm Hg has been reached.
• With the vacuum pump still in
operation, close the low-pressure
knob on the vacuum pump
coupling. Stop the vacuum pump.
• Open the 2-way valve by ¼ turn
and then close it after 10 seconds.
Check all the joints for leaks using
liquid soap or an electronic leak
device.
• Turn the body of the 2-way and
3-way valves. Disconnect the
vacuum pump hose.
• Replace and tighten
all the caps on the
valves.
Fig. 19
3-Way valve diagram
Connect to indoor unit
Open position
Spindle
Needle
Service port cap
Fig. 20
Refrigerant flow direction
3-Way valve
2-Way valve
Valve cap
Refrigerant pressure inspection
The low pressure range of refrigerant R32 is 0.8–1.2MPa and the high
pressure range is 3.2–3.7MPa. This means that the refrigerating system or
refrigerant of an air conditioner is abnormal if the low or high pressure ranges
of the detected compressor exceed the normal ranges.
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