-
-
'15 • SR-T-185
(b) Cooling overload protective control
(i) Operating conditions:
When the outdoor air temperature (TH) has become continuously for 0 seconds
at ºC or more, or ºC or more with the compressor running, the lower limit
speed of compressor is brought up.
(ii) Detail of operation
) The outdoor fan is stepped up by speed step. (Upper limit th speed.)
) The lower limit of compressor command speed is set to 0 or 0 rps and even if the calculated result be-
comes lower than that after fuzzy calculation, the speed is kept to 0 or 0 rps. However, when the thermo
OFF, the speed is reduced to 0 rps.
(iii) Reset conditions:
When either of the following condition is satisfied.
)
The outdoor air temperature is lower than 0ºC.
)
The compressor command speed is 0 rps.
Model
Item
SRR25, 35ZM-S
Outdoor air temperature
°C or more
°C or more
Lower limit speed
0 rps
0 rps
(c) Cooling high pressure control
(i) Purpose:
Prevents anomalous high pressure operation during cooling.
(ii) Detector:
Outdoor heat exchanger sensor (TH)
(iii) Detail of operation:
53
58
63
Outdoor unit heat exchanger temperature (°C)
6rps
(1)
6rps
(1)
0rps
After lapse of 30 sec. or over
(3)
After lapse of 30 sec. or over
(3)
After lapse of 30 sec. or over
(3)
lower limit
speed 30 rps
(Example) Fuzzy
Notes () When the outdoor heat exchanger temperature is in the range of - ºC, the speed is reduced by rps at each 0 seconds.
() When the temperature is ºC or higher, the compressor is stopped.
() When the outdoor heat exchanger temperature is in the range of - ºC, if the compressor command speed is been maintained and
the operation has continued for more than 0 seconds at the same speed, it returns to the normal cooling operation.
(c) Cooling overload protective control
(i) Operating conditions:
(ii) Detail of operation
(iii) Reset conditions:
Item
SRF25
㨪
50ZJX-S
Outdoor air temperature
Lower limit speed
Model
40
41
46
47
1((
10
10
Outdoor air temperature ( )
C
º
1)
2)
1)
2)
The outdoor fan is stepped up by 3 speed step. (Upper limit 7th speed.)
=
model SRF25, 35 only
?
(d) Cooling low outdoor temperature protective control
(i) Operating conditions:
When the outdoor air temperature (TH) is ºC or lower continues for 0 seconds
while the compressor command speed is other than 0 rps.
(ii) Detail of operation:
)
The lower limit of the compressor command speed is set to 0
〈44〉
(0) rps and even if the speed becomes
lower than 0
〈44〉
(0) rps, the speed is kept to 0
〈44〉
(0) rps. However, when the thermo OFF, the
speed is reduced to 0 rps.
)
The upper limit of the compressor command speed is set to 0
〈
0
〉
(0) rps and even if the calculated result
becomes higher than that after fuzzy calculation, the speed is kept to 0
〈
0
〉
(0) rps.
Note () Values in
〈
〉
are for outdoor air temperature is A or BºC
() Values in ( ) are for outdoor air temperature is C or DºC
First time
After the
second times
2XWGRRUDLUWHPSHUDWXUHÛ&
A
&
E
D
B
F
0
22
-8
25
3
-5
5
25
-2
28
8
1
Ɣ9DOXHVRI$%&'()
Outdoor air temperature
&
Upper limit 50 rp
s
Lower limit 44 rp
s
ON
ON
Upper limit 50 rps
Lower limit 50 rps
ON
Upper limit 60 rps
Lower limit 30 rps
C
A
OFF
E
D
B
F
