[2] Control of BC Controller

(1)Control of SVA, SVB and SVC

SVA, SVB and SVC are turned on and off depending on connection mode.

 

Mode

Heating

Stop

Defrost

Connection

Cooling

 

 

 

 

SVA

ON

OFF

OFF

OFF

SVB

OFF

ON

OFF

OFF

SVC

ON

OFF

OFF

OFF

 

 

 

 

 

(2)Control of SVM1 (only FA type)

SVM1 is turned on and off corresponding to operation mode.

 

Operation mode

 

Cooling-only

 

Cooling-main

 

Heating-only

 

Heating-main

 

Stop

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SVM1

 

 

 

ON

 

 

OFF

 

 

OFF

 

 

OFF

 

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(3) Control of LEV

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LEV opening (sj) is controlled corresponding to operation mode as follows:

 

 

(Number of pulse)

 

 

 

 

 

 

 

 

 

 

 

 

Operation mode

Cooling-only

Heating-only

Cooling-main

Heating-main

Stop

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LEV1

 

 

2000

 

60

 

 

• Liquid level

 

60

 

2000

 

 

 

 

 

 

 

Superheat

 

Differential

control *3

 

Differential

60

 

FA

 

LEV3

 

 

 

• Differential

 

 

 

 

 

control *1

 

Pressure control

 

Pressure control

 

 

 

 

 

 

 

 

pressure control

 

 

 

 

 

 

 

 

 

 

 

*2

 

 

 

 

*2

*2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FB

 

LEV3a

 

 

Superheat

 

60

 

 

Superheat

 

Superheat

60

 

 

 

 

control *1

 

 

 

control *1

 

control *1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Superheat

 

Control every minute so that superheat amount detected by bypass inlet and oulet

 

*1

 

temperatures TH12, TH15 stay in the specified range.

 

 

 

 

 

control

 

 

 

 

 

 

 

 

(FA: TH12, TH15, FB: TH22, TH25)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*2

Differential

 

Control every minute so that detected differential pressure (PS1, PS3) stay in the

 

pressure control

specified range.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*3

 

–

 

60 or more pulses are sometimes detected because of rise in liquid side pressure (PS1).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*Please confirm that the above parts of BC controllers are being color-corded and shown with the name plate inside the BC controller unit.

–49–

Page 50 Page 52
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Image 51
Mitsubishi Electronics PURY-P400 Control of BC Controller, Control of SVA, SVB and SVC, Control of SVM1 only FA type
Page 50 Page 52

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