Toshiba RAV-SM562BT-E Service Manual/Integration page 75

9-2-2. Outline of Main Controls
1. Pulse Modulating Valve (PMV) control
1) For PMV 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 103°C for SM562, SM802 and 92°C for SM1102, SM1402 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
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 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 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.
a
SM562, SM802 117
SM1102, SM1402 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
COOL HEAT COOL HEAT COOL HEAT COOL HEAT
11 value [A]
10.1
REQUIREMENT
b c d
107 103 100
106 100 95
SM562 SM802
12.0 12.2 14.0
TD [˚C]
Error stop ("P03" display with 4 times of error counts)
a
b
c
d
e
[°C]
e
Current [A]
93
90
I1
I1–0.5
SM1102 SM1402
18.9 19.7 19.7 19.7
– 75 –
Frequency down
Frequency holding
Frequency slow-up
(Up to command)
As command is
Frequency down
Hold
Normal operation
Hold