Mitsubishi Electric HP120TNU-A Service Handbook page 340

[8-14 BC Controller Maintenance Instructions ]
5. Pressure sensor
Work procedure
(1) Remove the service panel.
1) See the right figure and the section [3-5 External Ap-
pearance and Refrigerant Circuit Components of BC
Controller] for information on pressure sensors PS1 and
PS3.
(2) Remove the pressure sensor connector in
trouble from the control board, and insu-
late the connector.
1) Liquid-side pressure sensor (CNP1)
2) Intermediate-part pressure sensor (CNP3)
(3) Attach a new pressure sensor to the place
which is shown in the figure, and insert the
connector to the control board.
When gas leaks from the pressure sensor, repair the
leak, and follow the instructions above if required.
6. LEV
Work procedure
(1) Remove the service panel.
(2) Replace the LEV in trouble.
Secure enough service space in the ceiling for welding
operation, and conduct the work carefully.If required,
dismount the unit from the ceiling, and conduct the work.
7. Solenoid valve
Work procedure
(1) Remove the service panel.
(2) Remove the connector of the solenoid
valve in trouble.
(3) Remove the solenoid valve coil.
1) The coils on the solenoid valves SVA, SVB, SVC,
SVM1, and SVM1b can be serviced through the inspec-
tion door. SVC is accessible for replacement by remov-
ing the drain pan.
HWE18220_GB
Explanatory figure
PS1
PS3
CMB-P1016NU-KA1
Explanatory figure
LEV4
LEV1
CMB-P1016NU-KA1
*Special care must be taken when replacing heavy parts.
Explanatory figure
Solenoid valve
CMB-P1016NU-KA1
SVM1
SVM1b
LEV3
99
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