(c) Cooling overload protective control
(i) Operating conditions:
When the outdoor air temperature (TH2) has become continuously for 30 seconds at 41ºC or
more, or 47ºC or more (Model SRK45: 41ºC or more) with the compressor running, the lower
limit speed of compressor is brought up.
(ii) Detail of operation
1) The outdoor fan is stepped up by 3 speed step. (Upper limit 8th speed.)
2) The lower limit of compressor command speed is set to 30 or 40 (model SRK45 : 30) rps and even if the calculated result
becomes lower than that after fuzzy calculation, the speed is kept to 30 or 40 (model SRK45 : 30) rps. However, when the
thermo OFF, the speed is reduced to 0 rps.
(iii)
Reset conditions:
When either of the following condition is satisfied.
1) The outdoor air temperature is lower than 40ºC.
2) The compressor command speed is 0 rps.
Item
SRK25, 35ZMP-S SRK45ZMP-S
Outdoor air temperature
41°C or more 47°C or more 41°C or more
Lower limit speed
30 rps 40 rps 30 rps
Model
(d) Cooling high pressure control
(i) Purpose:
Prevents anomalous high pressure operation during cooling.
(ii) Detector:
Outdoor heat exchanger sensor (TH1)
(iii) Detail of operation:
A
B C
Outdoor heat exchanger temperature(°C)
8rps
(1)
8rps
(1)
0rps
After lapse of 20 sec. or over
(3)
After lapse of 20 sec. or over
(3)
After lapse of 20 sec. or over
(3)
(Example) Fuzzy
Notes (1) When the outdoor heat exchanger temperature is in the range of B~C ºC, the speed is reduced by 8 rps at each 20 seconds.
(2) When the temperature is C ºC or higher, the compressor is stopped.
(3) When the outdoor heat exchanger temperature is in the range of A~B ºC, if the compressor command speed is been maintained and the operation has
continued for more than 20 seconds at the same speed, it returns to the normal cooling operation.
¡
Temperature list
A B C
Outdoor air temperature
>
=
32 ºC
50 52 56
Outdoor air temperature <
32 ºC
42 44 50
'09•SRK-DB-087D
(i) Operating conditions:
(ii) Detail of operation:
C DA B
OFF
E F
Upper limit 50 rps
Lower limit 44 rps
ON
ON
Upper limit 50 rps
Lower limit 50ާ44ި rps
ON
Upper limit 60 rps
Lower limit 30 rps
Outdoor air temperature.(°C )
(iii) Reset conditions:
(f)
Heating high pressure control
(i) Purpose:
(ii) Detector:
(iii) Detail of operation:
A
B
C D
Indoor heat exchanger temperature(°C)
4rps
(1)
8rps
(2)
8rps
(2)
4rps
(1)
0rps
After lapse of 10 sec. or over
(3)
After lapse of 10 sec. or over
(3)
After lapse of 10 sec. or over
(3)
lower limit
speed 30 rps
(Example) Fuzzy
Temperature list
Models SRK25, 35
A B C D
RPSmin < 50
50
<
=
RPSmin < 91
91
<
=
RPSmin < 97
97
<
=
RPSmin < 100
100
<
=
RPSmin < 115
115
<
=
RPSmin
First time
After the
second times
Outdoor air temperature (˚C)
A B C DE F
1)
2)
1)
2)
than 50〔44〕<44> (30) rps, the speed is kept to 50〔44〕<44> (30) rps. However, when the thermo OFF, the
speed is
(Models SRK25, 35)
First time
After the
second times
Outdoor air temperature (˚C)
E F A B C D
, E, F (Model SRK45)
(3) Values in
〔 〕
are for the model SRK45.
0
5 7
2
16
9
19
11
25
22
28
25
〔44〕
10
52
54.5
54 55
51.554.5
51.5 50
50
A
C
B
D
(e) Cooling low outdoor air temperature protective control
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