Sanyo ECO-i 3-WAY MULTI SYSTEM Service Manual page 53

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
Turn off all equipment in system
When replacing or repairing a faulty
unit, let other normal indoor units run
2
(excluding indoor unit where refrigerant
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 ★
Evacuate air from repaired unit ★
Charge refrigerant in repaired unit ★
(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)
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
➀
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.)
➁
Press the
CAUTION
➂
Use the remote controller (RCS-TM80BG) to check the operating status of the indoor units. Check that all
units are operating in Cooling mode.
CAUTION
START
NO
YES
procedures (1)
NO
is recovered)
YES
recovered
NO
YES
Open ball valve
END
(MODE) button and change to cooling operation.
Even if the mode that is originally displayed is "Cool," be sure to press the
(MODE) button once or more to change to cooling operation. (Pressing the
(MODE) button ensures that heating/cooling operation is not mixed and that all
units are operating in either Heating or Cooling mode.)
With the 3-way valve, it is difficult to determine whether operation is heating or
cooling by touching the tubing.
5-2-3. Refrigerant recovery
procedures (2)
Modify power to permit turning off
power to refrigerant-recovered
indoor units independently
2 - 10
3-WAY 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 ★
Evacuate air in repaired unit ★
Charge refrigerant in repaired unit ★
(Amount of charge should equal that
recovered by refrigerant recovery unit)
Open the ball valve
Ready for normal operation
END
(CHECK)