131
OCH634C
OPERATING PROCEDURE
PHOTOS/FIGURES
9. Removing bypass valve coil (SV1) and bypass valve
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove 2 front cover panel fixing screws (5 × 12) and
remove the front cover panel. (See Photo 4)
(4) Remove 4 back cover panel fixing screws (5 × 12) and
remove the back cover panel.
(5) Remove 3 right side panel fixing screws (5 × 12) in the rear
of the unit and remove the right side panel.
(6) Remove the bypass valve coil fixing screw (M4 × 6).
(7) Remove the bypass valve coil by sliding the coil upward.
(8) Disconnect the connector SV1 (gray) on the outdoor multi
controller circuit board in the electrical parts box.
(9) Remove the electrical parts box. (See Photo 5)
(10) Recover refrigerant.
(11) Remove the welded part of bypass valve.
Photo 11 & 12
10. Removing the high pressure switch (63H) and high pres-
sure sensor (63HS)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove 2 front cover panel fixing screws (5 × 12) and
remove the front cover panel. (See Photo 4)
(4) Remove 4 back cover panel fixing screws (5 × 12) and
remove the back cover panel.
(5) Remove 3 right side panel fixing screws (5
o
12) in the rear
of the unit and remove the right side panel.
(6) Pull out the lead wire of high pressure switch and high pres-
sure sensor.
(7) Remove the electrical parts box. (See Photo 5)
(8) Recover refrigerant.
(9) Remove the welded part of high pressure switch and high
pressure sensor.
11. Removing the low pressure sensor (63LS)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove 2 front cover panel fixing screws (5 × 12) and
remove the front cover panel. (See Photo 4)
(4) Remove 4 back cover panel fixing screws (5 × 12) and
remove the back cover panel.
(5) Remove 3 right side panel fixing screws (5
o
12) in the rear
of the unit and remove the right side panel.
(6) Disconnect the connector 63LS (blue) on the outdoor multi
controller circuit board in the electrical parts box.
(7) Remove the electrical parts box. (See Photo 5)
(8) Recover refrigerant.
(9) Remove the welded part of low pressure sensor.
12. Removing linear expansion valve (LEV-A, LEV-B)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove 2 front cover panel fixing screws (5 × 12) and
remove the front cover panel. (See Photo 4)
(4) Remove 4 back cover panel fixing screws (5 × 12) and
remove the back cover panel.
(5) Remove 3 right side panel fixing screws (5
o
12) in the rear
of the unit and remove the right side panel.
(6) Remove the electrical expansion valve coil. (See Photo 12)
(7) Remove the electrical parts box. (See Photo 5)
(8) Recover refrigerant.
(9) Remove the welded part of electrical expansion valve.
High pressure
sensor (63HS)
High pressure
switch (63H)
Low pressure
sensor (63LS)
Bypass valve
coil fixing screw
Bypass valve
coil (SV1)
Bypass valve
Notes:
1. Recover refrigerant without spreading it in the air.
2. The welded part can be removed easily by removing
the right side panel.
3. When installing the following parts, cover it with a
wet cloth to prevent it from heating as the tempera-
ture below, then braze the pipes so that the inside of
pipes are not oxidized;
• Bypass valve (procedure 9), 120°C or more
• High pressure switch and high pressure sensor
(procedure 10), 100°C or more
• Low pressure sensor (procedure 11), 100°C or more
• Linear expansion valve (procedure 12), 100°C or
more
Refer to the notes below.
Refer to the notes below.
Refer to the notes below.
Low pressure
sensor (63LS)
Linear expansion
valve coil (LEV-A)
Linear
expansion valve
Linear expansion
valve coil (LEV-B)
Linear
expansion valve
Note:
When single refrigeration system consists of several independent refrigeration circuit, figure out the total refrigerant
amount by each independent refrigerant circuit.
Follow (1) to (3) to confirm the R410A concentration and take appropriate treatment, if necessary.
(1) Calculate total refrigerant amount by each refrigerant system.
Total refrigerant amount is precharged refrigerant at ex-factory plus additional charged amount at field installation.
(3) Use the results of calculations (1) and (2) to calculate the refrigerant concentration:
If the calculation results do not exceed the maximum concentration, perform the same calculations for the larger second and
third room, etc., until it has been determined that nowhere the maximum concentration will be exceed.
10-2-2. Confirming procedure of R410A concentration
(c) If the smallest room has mechanical ventilation apparatus
that is linked to a household gas detection and alarm device,
the calculations should be performed for the second smallest
room.
2. Removing the fan motor (MF1, MF2)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove 4 fan grille fixing screws (5 × 12) to detach the
fan grille. (See Photo 1)
(4) Remove a nut (for right handed screw of M6) to detach
the propeller. (See Photo 2.)
(5) Disconnect the connectors, CNF1 and CNF2 on multi con-
troller board in electrical parts box.
(6) Remove 4 fan motor fixing screws (5 × 20) to detach the
fan motor. (See Photo 3)
Photo 4
3. Removing the electrical parts box
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Disconnect the connecting wire from terminal block.(See
Photo 5)
(4) Remove all the following connectors from multi controller board;
<Diagram symbol in the connector housing>
• Fan motor (CNF1, CNF2)
• Thermistor <HIC pipe> (TH2)
• Thermistor <Outdoor liquid pipe> (TH3)
• Thermistor <Compressor> (TH4)
• Thermistor <Suction pipe/Ambient, Outdoor>
(TH6/7)
• High pressure switch (63H)
• High pressure sensor (63HS)
• Low pressure sensor (63LS)
• 4-way valve (21S4)
• Bypass valve (SV1)
Pull out the disconnected wire from the electrical parts box.
(5) Remove the terminal cover and disconnect the compres-
sor lead wire.
Electrical parts box
Cover panel
fixing screws
