Sanyo MDF-U500VX - Page 36

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(2) ECO mode ( Compressor overlapping run/alternate run)
㽲㩷 Frequency: Both compressor A and B are forced off (pull-up) once per day prior to diagnosis.
Diagnosis is performed for once per day (2:00a.m. or later) on either compressor A or B.
Diagnosis of compressor A is performed prior to compressor B.
(Ex.) After the power is supplied, diagnosis of compressor A is performed at 2:00a.m. or later.
Diagnosis of compressor B is performed the next day.
㽳 Calculation of period for diagnosing of cooling circuit: (ǻT1)x1.1 (ԙ indicated in the picture below)
Diagnosis pattern
a. When unit reaches set temp -2.0㷄 beyond the OFF point (set temp -0.6㷄) during a single
compressor cycle, it is diagnosed as 㵰Normal㵱 in that the unit can maintain cooling performance.
(Line-a indicated in the picture below)
b. When unit keeps temperature almost near set temp and diagnosis period expires, it is diagnosed as
㵰Normal㵱 in that the unit can maintain cooling performance. (Line-b indicates in the picture below)
c. When unit reaches the ON point (set temp +0.6㷄) during diagnosis, it is diagnosed as 㵰Abnormal㵱 in
that the unit cannot keep cooling performance because temperature increases is the same as pull-up
temperature except in cycle operation. (Line-c indicated in the picture below)
ĺ Diagnosis will be performed after 48 hours later and it will be determined as a failure in cooling circuit
if the results are the same.
ON
(Set temp+0.6㷄)
Set temp +0.4㷄
Chamber temp
Set temp+0.4㷄
OFF
Set temp-0.6㷄
Diagnosis OFF
(Set temp-2.0㷄)
Comp 䌁
Comp 䌂
of
f
of
f
on
on
of
f
of
f
on
on
㽲 Pull-up time
㰱䌔㪈
of
f
on
㽳Diagnosis period
㩿Ʀ㪫㪈㪀×㪈㪅㪈
a
b
c
on
on
Comp. Overlapping
㽲Pre-diagnosis
Diagnosis
ON
(Set temp+0.6㷄)
Set temp+0.4㷄
Chamer temp
Set temp+0.4㷄
㪦㪝㪝
(Set temp-0.6㷄)
Diagnosis OFF
(Set temp-2.0㷄)
Comp 䌁
Comp 䌂
of
f
of
f
on
on
of
f
of
f
on
on
㽲Pull-up time
ǻ
䌔1
of
f
on
㽳Diagnosis period
(ǻT1)×1.1
a
b
c
o䌦
䌦
on
Comp. alternate
of
f
of
f
㽲Pre-diagnosis
Diagnosis
Diagnosis of cooling circuit
(Compressor overlapping run)
Diagnosis of cooling circuit
(Compressor alternate run)