(4)Troubleshooting the major components of the BC controller

1)Pressure sensor

Pressure sensor troubleshooting flow

START

Note 1

Check pressure sensor, PS1, PS3, connectors for discon- nection, looseness, or incor- rect attachment.

 

OK?

No

 

 

 

Yes

Take corrective action.

No

Unit running?

 

 

Note 2

 

Yes

 

Check on the LED monitor dis-

 

play.

 

•TH2 or LPS of outdoor unit.

•HPS of outdoor unit

•PS1, PS3 of BC controller and

confirm the following relationship

HPS > PS1 PS3 > TH2 or LPS (puressure calculated value)

OK?

No

 

 

 

Yes

 

Check that refrigerant pip-

 

ing and transmission line

 

 

Stop the unit (compres-

connections are in agree-

ment between outdoor

sor OFF).

 

 

unit and BC controller.

 

 

No

At least

 

OK?

10 minutes passed since

No

 

stopping?

Yes

Yes

Note 2

 

Check PS1, PS3 on LED

 

monitor display and confirm

 

that none of the detected

 

pressure values is below

 

1kg/cm2G (0.098MPa).

 

 

Correct refrigerant piping and trans- mission line.

No

OK?

Note 3

Yes

HPS PS1 PS3 TH2 or LPS (pressure calcu- lated value) (The differ- ence is less than 1kg/ cm2G (0.098MPa)

OK?

No

 

 

No

 

Confirm the

Yes

 

following relationship PS1

 

No board or pressure

PS3?

 

Yes

 

sensor abnormality.

 

Check that refrigerant piping and transmission line connections are in agreement between outdoor unit and BC controller.

No

OK?

Correct refrigerant piping and the trans- mission line.

Yes

Check for faulty connector on

 

applicable pressure sensor.

 

No

 

OK?

 

Yes Note 4

Repair faulty connection.

Remove the pressure sensor

 

connector from the board, and check the pressure.

Pressure

No

range within 0 to 1kg/cm2G

 

(0.098MPa)

 

Short connectors 2 and 3 on the board and check the pressure.

Pressure

No

of at least 32kg/cm2G

 

(3.14MPa) indicated?

 

Yes

 

Replace the wrong puressure sensor with the correct pressure sensor, and confirm It’s detected pres- sure is indicated correctly.

OK?

No

 

Yes

 

Change pres-

Change board.

sure sensor.

 

–90–

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Mitsubishi Electronics P500YMF-C, PURY-P400 Troubleshooting the major components of the BC controller, Start, Ok?
Page 91 Page 93

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