Mitsubishi Electric PURY-100TMU, Service Handbook

Page: 38 / 121

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Mode
Connection
2000
Superheat
control *1
60
Differential
Pressure control
*2
2000
60
LEV1
LEV3
*1
*2
*3
Superheat
control
Differential
pressure control
–
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).
• Liquid level
control *3
• Differential
pressure control
*2
60
Differential
Pressure control
*2
[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.
Cooling Heating Stop Defrost
SVA ON OFF OFF OFF
SVB OFF ON OFF OFF
SVC ON OFF OFF OFF
(2) 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
* The above parts of BC controllers are color-corded and shown with the name plate inside the BC controller unit.