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8. CIRCUIT CONFIGURATION AND CONTROL SPECIFICATIONS
8-1. Indoor Control Circuit
8-1-1. Outline of Main Controls
1. Pulse Motor Valve (P.M.V.) control
1) PMV is controlled with 50 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 106°C for SP404, SP454, SM562, SM563, 100°C for SP562 in both cooling and
heating operations.
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.
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
P .M.V. control.
It subdivides the frequency control up to a unit
of 0.6Hz to stabilize the cycle.
2) When the discharge temperature is detected in
an abnormal stop zone, the unit stops the
compressor 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
8 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.
SM562, SM563,
117
SP404, SP454
SP562
111
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
SM562, SM563
SP404, SP454
SP562
a
b
c
d
107
103
100
106
100
95
11 value [A]
COOL
HEAT
10.13
12.00
10.13
10.50
11.55
13.43
CAUTION
TD [˚C]
Error stop ("P03" display with 8 times of error counts)
a
b
c
d
e
[A]
[°C]
I1
e
93
1–0.5
90
* For the cooling only models, only COOL is objective.
– 47 –
Frequency down
Frequency holding
Frequency slow-up
(Up to command)
As command is
Frequency down
Hold
Normal operation
Hold
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Troubleshooting
