Capacity Control - Toshiba RAS-07PKVP-E Service Manual

High Wall, Heat Pump Type
Outdoor fan speed (rpm)
07PAVP-E 10PAVP-E
Tap
07PAVP-ND 10PAVP-ND
f0 0 0
f1 230 230
f2 300 300
f3 350 350
f4 400 400
f5 450 450
f6 500 500
f7 550 550
f8 600 600
f9 650 650
fA 700 700
fB 750 750
fC 750 750
fD 750 800
fE 800 850
fF 800 850
1) The operation command sent from the remote
controller is processed by the indoor unit
controller and transferred to the controller of
the outdoor unit.
2) When strong wind blows at outdoor side, the
operation of air conditioner continues with the
fan motor stopped.
3) Whether the fan is locked or not is detected,
and the operation of air conditioner stops and
an alarm is displayed if the fan is locked.
4) According to each operation mode, by the
conditions of outdoor temperature (TO) and
compressor revolution, the speed of the
outdoor fan shown in the table is selected.
13PAVP-E 16PAVP-E 18PAVP-E
13PAVP-ND 16PAVP-ND 18PAVP-ND
0 0 0
230 230 230
300 300 300
350 350 350
400 400 400
450 450 450
500 500 500
550 550 550
600 600 600
650 650 650
700 700 700
800 800 800
800 800 800
850 850 900
900 900 950
900 900 950

8-5. Capacity Control

The cooling or heating capacity depending on the load
is adjusted.
According to difference between the setup value of
temperature and the room temperature, the capacity is
adjusted by the compressor revolution.
Remote controller
Set temperature (Ts)
Correction of Hz signal
Detection of electromotive force
of compressor motor winding
Detection of motor speed and rotor position
Correction value of Hz signal Operating Hz
Inverter output change
Commutation timing change
Change of compressor speed
1) The difference between set temperature on
remote controller (Ts) and room temperature
(TA) is calculated.
2) According to the temperature difference, the
correction value of Hz signal which determines
the compressor speed is set up.
3) The rotating position and speed of the motor
are detected by the electromotive force
occurred on the motor winding with operation
of the compressor.
4) According to the difference resulted from
comparison of the correction value of Hz signal
with the present operation Hz, the inverter
output and the commutation timing are varied.
5) Change the compressor motor speed by
outputting power to the compressor.
*The contents of control operation are same
in cooling operation and heating operation
38
Service Manual
Indoor unit
Room temperature (TA)
Ts –TA