Panasonic U-4LE1E5, Service Manual, Page: 44 / 133

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Mini VRF SYSTEM
Outdoor Unit Repair Procedures
7. Compressor
(18)
(19)
(20)
(21)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
Remove dry cores. Connect the tube that runs
from the liquid tube valve to the ball valve.
At the outdoor unit where dry cores were removed,
pressurize with 3.80 MPa of nitrogen from the liquid
tube service port and check for leaks.
After draining all nitrogen from the tubing, apply
vacuum to the outdoor unit where dry cores were
removed until the pressure is –101 kPa (–755 mm
Hg, 5 Torr) or less using the liquid tube service
port.
7-4. Replacing the Compressor
When removing and installing compressors, use
sufficient caution to ensure that water or other
substances do not enter the refrigerant tubing system.
7-4-1. Replacing the compressor
(A) Replacing the inverter compressor
(Compressor 1 on remote controller alarm display)
Removal
Connect a manifold gauge to the high- and low-
pressure outlet ports at the outdoor unit where the
compressor will be replaced. Connect the manifold
gauge to a nitrogen cylinder and perform nitrogen
replacement.
Follow the procedure for removing panels, and
remove the front panel, the right lower panel, and
the electrical component box cover. (Fig. 2-10)
Follow the refrigerant work procedure and recover
the refrigerant.
Remove the acoustic material that surrounds the
compressor (3 layers).
Remove the cap from the compressor terminal
plate. Disconnect the power terminal and internal
terminal.
Remove the crankcase heater.
Remove the 3 flange washers that are attached to
the compressor legs as shown in Fig. 2-11.
Prepare to disconnect the 2 welded locations shown
in Fig. 2-11. Protect the sensors and the surrounding
plates, rubber, lead wires, clamps, and other items.
Disconnect the 2 welded locations shown in Fig. 2-11.
Tilt the compressor toward you slightly. Lift it off of
the bolt at the rear of the compressor, then pull the
compressor toward you.
Refer to the “Charging additional refrigerant” items.
Charge with an amount of refrigerant equal to the
amount that was recovered.
Liquid tube
valve
Liquid tube
Outdoor unit
service port
Dry core
Ball valve
Fig. 2-9
Fig. 2-10
Fig. 2-11
Front panel
Cover A
Acoustic material
Crankcase heater
Washer-with-collar (3 locations)
Cushioning rubber
(3 locations)
Welding locations to disconnect (2)
SM830195-01̲Mini VRF SYS.indb 16 SM830195-01̲Mini VRF SYS.indb 16 2011/12/20 16:31:17 2011/12/20 16:31:17