Sanyo MDF-U55V - Compressor Control Operational Chart; Cycle Diagram for Compressor H;L Operation

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11. Compressor control (differential) value
Compressor H:
Turns on when a chamber temperature is set temperature -0.4䉝.
Compressor L
:
1) Turns on when compressor H turns on and a cascade sensor temperature is -34䉝.
2) Turns on after 3 minutes elapse since compressor H turned on
Compressor H, L
:
Turns off when a chamber temperature is set temperature -1.6䉝
Interval:
1 minute *
* ‘Interval’ means that a period one of compressor either H or L turns on after another one was
turned on.
Note) Compressor L does not turn on until 1 minute elapses since compressor H turned on,
if a temperature in cascade sensor is lower than -34䉝.
Protection for compressor H:
Compressor H turns off to prevent it from being warmed up that is caused by fan motor lock.
Filter sensor temperature:
Compressor H turns off when a filter sensor temperature is higher than 60䉝. It will turn on again
when the filter sensor temperature is lower than ambient temperature +10䉝.
<Operational chart of compressor H/L during cycle>
SV
Chamber
temp.
(䠬䠲)
1min or over
PV=SV-1.4
SV-0.4䉝
SV-1.4䉝
Comp. H&L OFF
PV=SV-0.4
PV=SV-1.4
PV=SV-0.4
CT=-34䉝
Comp. H ON
Comp. L ON
Cascade
temp.
(CT)
Comp. H
CT=-34䉝
3min. or over
䠄Comp. delay䠅
1min or over
3min. or over
䠄Comp. delay䠅
CT=-34䉝
Comp. L
Comp. H ON
Comp. H&L OFF
Comp. L ON