Outdoor Control - Toshiba RAV-SM1100UT-E Service Manual

7-1. Outline of Main Controls
1. Pulse Modulating Valve (PMV) control
1) For PMV, SM1100 is controlled with 45 to 500 pulses and SM1400 with 50 to 500 pulses during opera-
tion, 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 SM1100 and 100°C for SM1400 in both cooling and heating opera-
tions.
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 discharge
temperature has not lower or the discharge temperature has rapidly risen during PMV control. It subdi-
vides 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 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
SM1100
111
SM1400
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.
SM1100
Objective
model
COOL
I1 value [A] 18.90

7. OUTDOOR CONTROL

b c d
106 100 95
SM1400
HEAT COOL HEAT
19.65 19.65 19.65
TD [˚C]
Error stop ("P03" display with 4 times of error counts)
a
b
c
d
[°C]
e
e
90
I1
1–0.5
– 24 –
Frequency down
Frequency holding
Frequency slow-up
(Up to command)
As command is
[A]
Frequency down
Hold
Normal operation
Hold