Mitsubishi Electric PUHY-200YMF-B Service Handbook page 70

[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
Connection
SVA
SVB
SVC
(2) Control of SVM
SVM is turned on and off corresponding to operation mode.
Operation mode Cooling-only
SVM
(3) Control of LEV
LEV opening (sj) is controlled corresponding to operation mode as follows:
Operation mode
LEV1
4
LEV2*
LEV3
LEV4* 4
Superheat
*1
control
Differential
*2
pressure control
*3
–
*4
–
* Please confirm that the above parts of BC controllers are being color-corded and shown with the name plate inside
the BC controller unit.
Cooling
ON
OFF
ON
Cooling-main
ON OFF
Cooling-only Heating-only
2000 60 *4
Superheat Differential
control *1 Pressure control
60
Control every minute so that superheat amount detected by bypass inlet and oulet
temperatures (TH12, TH15) stay in the specified range.
Control every minute so that detected differential pressure (PS1, PS3) stay in the
specified range.
60 or more pulses are sometimes detected because of rise in liquid side pressure (PS1).
There are not LEV2 and LEV4 on CMB-P-V-E.
Heating
OFF
ON
OFF
Heating-only
OFF
Cooling-main
• Liquid level
control
• Differential
pressure control
*2
60
–68–
Stop Defrost
OFF
OFF
OFF
Heating-main Defrost
OFF ON
(Number of pulse)
Heating-main Defrost
60 *3 2000
Differential
2000
Pressure control
*2
*2
OFF
OFF
OFF
Stop
OFF
Stop
1000
60
60