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9. OUTDOOR CONTROL
9-1. Outline of Main Controls
1. Pulse Modulating Valve (PMV) 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 105°C for SM560 and 100°C for SM800, SM1100, SM1400 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.
2. Discharge temperature release control
1) This function controls the operation frequency, that
is, lowers the operation frequency when the dis-
charge temperature has not lower or the discharge
temperature has rapidly risen during PMV control. It
subdivides the frequency control up to a unit of
0.6Hz 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 opera-
tion 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]
SM560
SM800, 1100, 1400
abcde
117 112 108 105 98
111 106 100 95 90
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]
SM560
COOL HEAT
9.22 11.93
SM800
COOL HEAT
12.00 13.43
* For the cooling only models, only COOL is objective.
SM1100
COOL HEAT
18.90 19.65
SM1400
COOL HEAT
19.65 19.65
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
1–0.5
[A]
Frequency down
Normal operation
Hold
Hold