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2. Discharge temperature release control
1) This function controls the operation frequency, that
is, lowers the operation frequency when the
discharge temperature has not lower or the
discharge temperature has rapidly risen during
PMV control. It subdivides the frequency control
up to a unit of 0.6 Hz to stabilize the cycle.
2) When the discharge temperature is detected in an
abnormal stop zone, the unit stops the compres-
sor and restarts after 2 minutes 30 seconds. The
error counter is cleared when it has continued the
operation for 10 minutes.
If the abnormal stop zone has been detected by 4
times without clearing of counter, an error “P03” is
displayed.
∗ The cause is considered as excessively little
amount of refrigerant, defective PMV, or clogging
of cycle.
[°C]
3. Current release control
The output frequency and the output voltage are
controlled by AC current value detected by T02 on the
outdoor P.C. board so that input current of the inverter
does not exceed the specified value.
Objective model
I1 value [A]
SM160
COOL HEAT
24.69 28.80
SM160
abcde
111 106 100 95 90
a
b
c
d
e
TD [˚C]
Error stop ("P03" display with 4 times of error counts)
As command is
Frequency down
Frequency holding
Frequency slow-up
(Up to command)
I1
I1–0.5
Current [A]
Frequency down
Normal operation
Hold
Hold
8. CIRCUIT CONFIGURATION AND CONTROL SPECIFICATIONS
8-1. Outdoor Controls
8-1-1. Outline of Main Controls
1. Pulse Motor Valve (PMV) control
1) For PMV with 45 to 500 pulses during operation, respectively.
2) In cooling operation, PMV is controlled with the temperature difference between TS sensor and TC sensor.
3) In heating operation, PMV is controlled with the temperature difference between TS sensor and TE sensor.
4) For the temperature difference in items 2) and 3), 1 to 5K is aimed as the target in both cooling and
heating operations.
5) When the cycle excessively rose in both cooling and heating operations, PMV is controlled by TD sensor.
The aimed value is usually 92°C for SM160 in both cooling and heating operations.
REQUIREMENT
A sensor trouble may cause a liquid back-flow or abnormal overheat resulting in excessive shortening of the
compressor life. In a case of trouble on the compressor, be sure to check there is no error in the resistance
value an the refrigerating cycle of each sensor after repair and then start the operation.