Panasonic CU-YL28HBE5, Service Manual

Page: 39 / 125

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• Pump down operation
• Operate the pump down according to the following procedures.
10.1.9. Electrical Wiring
• Connect the power supply wiring and indoor/outdoor unit
connection wiring according to the electrical circuit diagram
instructions.
• Clamp the wires securely to the terminal connections using
cord clamps so that no undue force is placed on the wires.
1. Connect the power supply line to a single-phase 220 –
240V power supply.
2. The equipment shall be connected to a suitable mains
network with a main impedance less than the valve
indicated in the table of power supply specifications.
3. Be sure to connect the wires correctly to terminal board
with connecting the crimp type ring terminal to the wires.
4. The binding screws inside the power supply box may
become loosened due to vibration during transportation,
so check that they are tightened securely.
5. Tighten the binding screws to the specified torque while
referring to the table below.
6. If connecting two separate wires to a single crimped
terminal, place the two crimped terminal wires together as
shown in Fig. A. (If the arrangement shown in Fig. B is
used, poor contacts or contact damage may result.)
7. If momentarily turning on the power supply for both the
indoor and outdoor units, do not turn the power off again
until at least 1 minute has passed (except when a
reversed phase has been detected).
Procedure Notes
1. Confirm the valve on the liquid side and the gas side is surely open.
2. Press the PUMP DOWN switch on outdoor printed board for 1 sec-
ond or more.
Perform the cooling operation for five minutes or more.
3. Shut the valve on the liquid side surely. When the valve is shut halfway, the compressor is occasionally
damaged.
The units must be connected to the supply cables for fixed wiring by qualified technician.
Feed the power source to the unit via a distribution switch board designed for this purpose, the switch should
disconnected all poles with a contact separation of at least 3mm.
When the supply cable is damaged, it must be replaced by qualified technician.
Be sure to install a current leakage breaker, main switch and fuse to the main power supply, otherwise electric shocks
may result.
Be sure to connect the unit to secure earth connection.
If the earthing work is not carried out properly, electric shocks may result.
Wiring shall be connected securely by using specified cables and fix them securely so that external force of the cables
may not transfer to the terminal connection section.
Imperfect connection and fixing leads to fire, etc.
Use only the specified cables for wiring connections. Connect the cable securely, and secure them properly so that
no undue force will be applied to the terminal connections.
If the terminals are loose or if the wires are not connected securely, fire may result.
Terminal screw Tightening torque N•cm {kgf•cm}
M3 69~98 {7~10}
M4 157~196 {16~20}