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8. Diagnosis of abnormal cooling circuit
(1) Normal mode
Frequency: Diagnosis is performed for once per day (2:00a.m. or later) on either compressor A and B.
Diagnosis of compressor A is done first.
(Ex.) After the power is supplied, diagnosis of compressor A is performed at 2:00a.m. or later.
2 portions of pull-up time just before diagnosis (
Calculation of period for diagnosing cooling circuit: ( T1+ T2)/2x1.1 (
Diagnosis pattern
a. When unit reaches set temp -2.0
cycle, the diagnosis is considered Normal that the unit can keep cooling performance.
(Line-a indicates in the picture below)
b.
When unit keeps temperature almost near set temp and diagnosis period expires, the diagnosis is
considered Normal that the unit can keep cooling performance.
(Line-b indicates in the picture below)
c.
When unit reaches the ON point (set temp +0.6 ) during diagnosis, the diagnosis is considered
Abnormal that the unit cannot keep cooling performance because temperature increases is the same
as pull-up temperature except in cycle operation. (Line-c indicates in the picture below)
Diagnosis will be performed again 48 hours later and it will be determaind as a failure in cooling
circuit if the results are the same.
Pull-up time
ON
Set temp+0.6
Chamber temp
OFF
(Set temp-0.6 )
Diagnosis OFF
(Set temp-2.0 )
Comp
Comp
Diagnosis of compressor B is performed the next day.
beyond the OFF point (set temp -0.6 ) during a single compressor
Pull-up time
off
on
off
on
indicated in the picture below) are stored.
Diagnosis point
off
on
off
on
- 32 -
indicated in the picture below)
Diagnosis period
×
on
off
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