Sanyo CHDXR09663* Service Manual page 49

5. Recovering Refrigerant
5-2. Refrigerant Recovery Procedures (Indoor Unit)
The flowchart below shows the refrigerant recovery procedures you must follow when replacing or repairing the
indoor unit due to trouble in the refrigerant circuit.
5-2-1. Cooling operation (for all units)
Ball valve is provided in the indoor unit
5-2-2. Refrigerant recovery
procedures (1)
Turn off all equipment in system
When replacing or repairing a faulty
unit, let other normal indoor units run
(excluding indoor unit where refrigerant
2
is recovered)
Power can independently be turned off
for indoor unit where refrigerant is
Change controllable number of indoor
units (including changes in group
control and integrated-control settings)
Other indoor units can operate normally
Replace or repair faulty unit
Check for leakage in repaired unit H
Evacuate air from repaired unit H
Charge refrigerant in repaired unit H
(Amount of charge should equal that
recovered by refrigerant recovery unit)
Change controllable number of indoor
units (including changes in group
control and integrated-control settings)
Open ball valve
Ready for normal operation
Service work performed on indoor units is done simultaneously using the service ports at the liquid (narrow tube) side
and the gas (wide tube) side ball valves. Refer to each section in the "Installation Instructions" on refrigerant charging,
leak checking, and evacuation procedures.
5-2-1. Cooling operation (for all units)
(1) If the remote controller (RCS-TM80BG) is used for maintenance of the outdoor unit
1 Connect the outdoor unit maintenance remote controller to the RC connector (CN006) (3P) (BLU) on any
one of the outdoor unit control PCBs. Then start a test run of all units. (Press and hold the
button for 4 seconds or longer.)
Press the
2
Refer to the test run service manual for the detail of the outdoor maintenance remote controller operation.
It may be possible to determine whether operation is cooling or heating by touching the gas tubing.
Cooling : low temperature (68 °F or lower)
Heating : high temperature (140 °F or higher)
CAUTION
START
NO
YES
NO
YES
Modify power to permit turning off
NO
recovered
YES
END
(MODE) button and change to cooling operation and ensure that the cooling is performed.
The gas tubing becomes hot (140 °F or higher) in heating mode. Be careful so as
not to be burnt when touching the tubing.
5-2-3. Refrigerant recovery
procedures (2)
Fig.8
power to refrigerant-recovered
indoor units independently
2 - 10
W-2WAY ECO-i SYSTEM
Outdoor Unit Repair Procedures
Turn off all equipment in system
Replace or repair faulty unit
Check for leakage in repaired unit
Evacuate air from repaired unit
Charge refrigerant in repaired unit
(Amount of charge should equal that
recovered by refrigerant recovery unit)
Ready for operation
END
Replace or repair faulty unit
Check for leakage in repaired unit H
Evacuate air in repaired unit H
Charge refrigerant in repaired unit H
(Amount of charge should equal that
recovered by refrigerant recovery unit)
Open the ball valve
Ready for normal operation
END
(CHECK)