-
45
-
(iii) Current safe control
1) If the inverter inflow current (CT current) becomes higher than the following set value, the compressor’s speed is
lowered. If the current is still above the set value after the speed is lowered, the speed is lowered still further.
2) If the current value drops to or below the cancellation value continuously for 3 minutes, this control is ended and the
speed protection cancel operation is started.
(iv) High pressure control
1) Compressor speed control during heating
If the compressor’s speed exceeds the speed in the following table, the compressor’s speed is controlled at the upper
limit value in accordance with the indoor heat exchanger temperature (ThI-R1) during operation.
2) Compressor speed control during cooling
If the compressor’s speed exceeds the speed in the following table, the compressor’s speed is controlled at the upper
limit value in accordance with the outdoor heat exchanger temperature (Tho-R1) during operation.
3) Operation stop control according to indoor heat exchanger temperature
If an indoor heat exchanger temperature (sensed by ThI-R1) of 65
°
C or higher is detected continuously for 2 seconds
during compressor operation in the heating mode, the compressor’s speed is controlled. If the indoor heat exchanger’s
temperature drops to 47
°
C or lower, this control ends and the speed protection cancellation operation starts.
4) Control according to the outdoor heat exchanger temperature
a) If an outdoor heat exchanger temperature (sensed by Tho-R1) that is higher than the set value is detected,
during compressor operation in the cooling mode, the compressor is stopped. When the temperature drops to or
below the set value, compressor operation resumes automatically.
b) If the outdoor heat exchanger temperature exceeds the set value 5 times within a period of 60 minutes or
continuously for 60 minutes even when the compressor is stopped, the unit is subjected to an abnormal stop.
(E35).
Note (1) If an outdoor heat exchanger temperature abnormal stop occurs and the temperature does not drop to 51ºC or lower for 3 minutes
continuously, operation cannot be resumed.
5) Abnormality detected by the high pressure switch (63H1)
If the pressure rises and the high pressure switch (4.15 open/3.15 closed MPa) operates (opens) 5 times within 60
minutes or operates (remains open) continuously for 60 minutes even when the compressor is stopped, the compres-
sor performs an abnormal stop (E40).
(v) Low pressure control (LPT)
1) Compressor speed protective control
a) If all the following conditions are satisfied 5 minutes or more after the compressor starts or after a defrost reset,
the compressor’s speed is lowered.
1
If the low pressure is 0.15 MPa or lower continuously for 10 seconds.
2
If the compressor speed is 20 rps or higher.
b) The low pressure is detected again 30 seconds later, and if it is lower than 0.15 MPa, the compressor speed is
lowered again.
c) If the low pressure becomes 0.189 MPa or higher, this control ends and the speed protection cancel operation
begins.
15(16)
Model
Set valve (A)
302 series
20
52 ~ 58
Model
Item
302 series
Indoor heat exchanger temp (
°
C)
Compressor rotational speed (rps)
20
52 ~ 58
Model
Item
302 series
Outdoor heat exchanger temp (
°
C)
Compressor rotational speed (rps)
51
65
Compressor operation
Compressor stops
Outdoor heat exchanger temperature (˚C)
Note (1) Values in ( ) show the values during heating.
