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13-2. Refrigerant Recovery
13-2-1. Open service valve to recover refrigerant into refrigerant
recovery unit.
13-3. Service on Outdoor Unit
13-3-1. After making sure that the refrigerant in the circuit has
been completely discharged, perform required servicing,
such as replacing the compressor or repairing refrigerant
leaks.
13-3-2. Before going on to the next step, leak test all joints where
welding has been done.
Nitrogen gas is best when pressurizing the system for a
leak test. However, if it is necessary to instead test with
refrigerant gas, be sure to recover all gas into the refriger-
ant recovery unit after completing the leak test.
13-4. Evacuation Using Vacuum Pump
13-4-1. Using a hex wrench, set the valve stems of the narrow
and wide tube service valves as indicated in the table
below.
Refer to Service Valve
Construction shown in Fig. 3.
NOTE
NOTE
Refrigerant released into the air contributes to
destruction of our planet’s ozone layer. You should
always use the refrigerant recovery unit to help
protect the environment.
CAUTION
HiLo
Outdoor unit
Manifold valve
Pressure
gauge
Vacuum pump
Service Valve Valve Position
Narrow
Position – a –
Wide
Action
Narrow Tube Service
Valve (2-Way)
Wide Tube Service
Valve (3-way)
Fully OPEN
Position – a –
Position – b –
*
Hose
CLOSED
*
*
Fig. 2
Fig. 3
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