-
107
-
'17 • PAC-T-256
'09•SRK-DB-087D
(b) Frost prevention control
(i) Operating conditions
(ii) Detail of anti-frost operation
(iii) Reset conditions
Indoor heat exchanger
temperature (°C)
2.5
5
8
0 rps
Lower
limit
speed
(2) Cooling overload protective control
(a) Operating conditions
(b) Detail of operation
Indoor heat exchanger
temperature
Item
5°C or lower
2.5°C or lower
Lower limit of compressor command speed
Indoor fan
Outdoor fan
4-way valve
Outdoor air temperature
Lower limit speed
1)
2)
1)
2)
1)
2)
1)
2)
(c) Reset conditions
(models SRK50, 60 : 25 rps)
Depends on compressor speed
The lower limit of compressor speed is set to 30 or 40 rps.
However, when the thermo OFF, the speed is reduced to 0 rps.
The outdoor fan is stepped up by 3 speed step. [Upper limit 8 th speed.]
compressor
speed
Keep the fan speed before
frost prevention control
2.5–5
5–8
When the outdoor air temperature (TH2) has become continuously for 30 seconds at 41°C or more, or
47ºC or more with the compressor running, the lower limit speed of compressor is brought up.
40°C.
'09•SRK-DB-087D
(4) Cooling low outdoor air temperature protective control
(a) Operating conditions
(b) Detail of operation
22
25
9
11
OFF
Upper 2
Lower 2
ON
ON
Upper 1
Lower 1
(C) Reset conditions
(5 ) Heating high pressure control
(a) Purpose
(b) Detector
(c) Detail of operation
A
B
C
D
Indoor heat exchanger temperature(°C)
4rps
(1)
8rps
(2)
8rps
(2)
4rps
(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)
lower limit
speed 35 rps
(Example)
Compressor
speed
Temperature list
Models SRK20, 25, 35
A
B
C
D
RPSmin < 50
50 <= RPSmin < 91
91 <= RPSmin < 97
97 <= RPSmin < 100
100 <= RPSmin < 115
115 <= RPSmin
When the outdoor air temperature (TH2) is 22°C or lower continues for 20 seconds while the compressor speed is other than 0 rps.
Compressor speed: Upper/lower limit (rps)
Upper 2
Lower 2
Lower 1
Upper 1
Range A
Range B
26
24
Outdoor air temperature (
Υ
Range A
Range B
60
45
75
35
Release
1) It controls the upper and lower limit values for the compressor speed according to the following table.
2) It checks the outdoor temperature (TH2) once every hour to judge the operation range.
When either of the following condition is satisfied.
1) The outdoor air temperature (TH2) is D°C or higher.
2) The compressor speed is 0 rps.
fan
speed
fan
When the indoor heat exchanger temperature is in the range of A-B °C, if the compressor speed is been maintained and the operation has continued for more
than 20 seconds at the same speed, it returns to the normal heating operation.
B-C
C-D
48
48.5
48.5
48.5
48.5 - 40.1
40.1
53
56
56 - 52.5
52.5 - 50.8
50.8 - 42
42
55
58
58
58 - 56.2
56.2 - 47.3
47.3
58
61
61
61
61
61
10
10
THi-R
'09•SRK-DB-087D
(b) Frost prevention control
(i) Operating conditions
(ii) Detail of anti-frost operation
(iii) Reset conditions
Indoor heat exchanger
temperature (°C)
2.5
5
8
0 rps
Lower
limit
speed
(2) Cooling overload protective control
(a) Operating conditions
(b) Detail of operation
Indoor heat exchanger
temperature
Item
5°C or lower
2.5°C or lower
Lower limit of compressor command speed
Indoor fan
Outdoor fan
4-way valve
Outdoor air temperature
Lower limit speed
1)
2)
1)
2)
1)
2)
1)
2)
(c) Reset conditions
(models SRK50, 60 : 25 rps)
Depends on compressor speed
The lower limit of compressor speed is set to 30 or 40 rps.
However, when the thermo OFF, the speed is reduced to 0 rps.
The outdoor fan is stepped up by 3 speed step. [Upper limit 8 th speed.]
compressor
speed
Keep the fan speed before
frost prevention control
2.5–5
5–8
When the outdoor air temperature (TH2) has become continuously for 30 seconds at 41°C or more, or
47ºC or more with the compressor running, the lower limit speed of compressor is brought up.
40°C.
'09•SRK-DB-087D
(4) Cooling low outdoor air temperature protective control
(a) Operating conditions
(b) Detail of operation
22
25
9
11
OFF
Upper 2
Lower 2
ON
ON
Upper 1
Lower 1
(C) Reset conditions
(5 ) Heating high pressure control
(a) Purpose
(b) Detector
(c) Detail of operation
A
B
C
D
Indoor heat exchanger temperature(°C)
4rps
(1)
8rps
(2)
8rps
(2)
4rps
(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)
lower limit
speed 35 rps
(Example)
Compressor
speed
Temperature list
Models SRK20, 25, 35
A
B
C
D
RPSmin < 50
50 <= RPSmin < 91
91 <= RPSmin < 97
97 <= RPSmin < 100
100 <= RPSmin < 115
115 <= RPSmin
When the outdoor air temperature (TH2) is 22°C or lower continues for 20 seconds while the compressor speed is other than 0 rps.
Compressor speed: Upper/lower limit (rps)
Upper 2
Lower 2
Lower 1
Upper 1
Range A
Range B
26
24
Outdoor air temperature (
Υ
Range A
Range B
60
45
75
35
Release
1) It controls the upper and lower limit values for the compressor speed according to the following table.
2) It checks the outdoor temperature (TH2) once every hour to judge the operation range.
When either of the following condition is satisfied.
1) The outdoor air temperature (TH2) is D°C or higher.
2) The compressor speed is 0 rps.
fan
speed
fan
When the indoor heat exchanger temperature is in the range of A-B °C, if the compressor speed is been maintained and the operation has continued for more
than 20 seconds at the same speed, it returns to the normal heating operation.
B-C
C-D
48
48.5
48.5
48.5
48.5 - 40.1
40.1
53
56
56 - 52.5
52.5 - 50.8
50.8 - 42
42
55
58
58
58 - 56.2
56.2 - 47.3
47.3
58
61
61
61
61
61
10
10
THi-R
'09•SRK-DB-087D
(4) Cooling low outdoor air temperature protective control
(a) Operating conditions
(b) Detail of operation
22
25
9
11
OFF
Upper 2
Lower 2
ON
ON
Upper 1
Lower 1
(C) Reset conditions
(5 ) Heating high pressure control
(a) Purpose
(b) Detector
(c) Detail of operation
A
B
C
D
Indoor heat exchanger temperature(°C)
4rps
(1)
8rps
(2)
8rps
(2)
4rps
(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)
lower limit
speed 35 rps
(Example)
Compressor
speed
Temperature list
Models SRK20, 25, 35
A
B
C
D
RPSmin < 50
50 <= RPSmin < 91
91 <= RPSmin < 97
97 <= RPSmin < 100
100 <= RPSmin < 115
115 <= RPSmin
When the outdoor air temperature (TH2) is 22°C or lower continues for 20 seconds while the compressor speed is other than 0 rps.
Compressor speed: Upper/lower limit (rps)
Upper 2
Lower 2
Lower 1
Upper 1
Range A
Range B
26
24
Outdoor air temperature (
Υ
Range A
Range B
60
45
75
35
Release
1) It controls the upper and lower limit values for the compressor speed according to the following table.
2) It checks the outdoor temperature (TH2) once every hour to judge the operation range.
When either of the following condition is satisfied.
1) The outdoor air temperature (TH2) is D°C or higher.
2) The compressor speed is 0 rps.
fan
speed
fan
When the indoor heat exchanger temperature is in the range of A-B °C, if the compressor speed is been maintained and the operation has continued for more
than 20 seconds at the same speed, it returns to the normal heating operation.
B-C
C-D
48
48.5
48.5
48.5
48.5 - 40.1
40.1
53
56
56 - 52.5
52.5 - 50.8
50.8 - 42
42
55
58
58
58 - 56.2
56.2 - 47.3
47.3
58
61
61
61
61
61
10
10
THi-R
(5) Heating high pressure control
(a) Starting condition
When the indoor heart exchanger temperature (Thi-R) has risen to a specified temperature while the compressor is turned on.
(b)
Compressor speed is controlled according to the zones of indoor heat exchanger temperature as shown by the following table.
(6) Heating overload protective control
(a)
Operating condition
(b) Detail of operation
H
13
90(75) rps
30(40) rps
40 rps.
fuzzy calulation, the speed is kept to 30(40) rps. However, when the thermostat OFF, the speed is reduced to
The outdoor fan speed is stepped down by 3 speed step.(Low limit 2nd speed)
(i)
(ii)
(iv)
Reset condition
11
H
11
13
16
17
OFF
Upper 75 rps
Lower 40 rps
Upper 90 rps
Lower 30 rps
Outdoor air temperature(ºC)
(c)
than that after
speed is
(iii)
0 rps.
Thi-R<P1
P1
≦
Thi-R<P2 P2
≦
Thi-R<P3
P3
≦
Thi-R
Protection control speed (NP)
Normal
Retention
NP-4rps
NP-8rps
Sampling time (s)
Normal
10
10
10
Thi-R
NP
P1
P2
P3
NP<50
45
52
54.5
50
≦
NP<115
45
52
57
115
≦
NP<120
45-43
52-50
57-55
120
≦
NP
43
50
55
Unit:°C
