-
75
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'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)
2.55 8
0 rps
Lower
limit
speed
(c) Cooling overload protective control
(i) Operating conditions
(ii) 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
Item
SRK20, 25, 35
Outdoor air temperature
Lower limit speed
Model
1)
2)
1)
2)
1)
2)
1)
2)
(iii) Reset conditions
Depends on compressor speed
The lower limit of compressor speed is set to 25 or 30 or 40rps.
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 (models SRK20, 25, 35 : TH3 ; models SRK50, 60 : TH2) has become continuously
for 30 seconds at 38°C or more, or 41°C or more, or 47ºC or more with the compressor running, the lower limit speed
of compressor is brought up.
(d) Cooling high pressure control
(i) Purpose
Prevents anomalous high pressure operation during cooling.
(ii) Detector
Outdoor heat exchanger sensor (models SRK20, 25, 35 : TH2 ; models SRK50, 60 : TH1).
(iii) Detail of operation
P1
P2
P3
Outdoor heat exchanger temperature (°C)
8rps
(1)
8rps
(1)
0rps
After lapse of 30 sec. or over
(3)
After lapse of 30 sec. or over
(3)
After lapse of 30 sec. or ove
Notes (1) When the outdoor heat exchanger temperature is in the range of P2-P3䉝, the speed is reduced by 8 rps at each 20 seconds.
(2) When the temperature is P3䉝㻌or higher, the compressor is stopped.
(3) When the outdoor heat exchanger temperature is in the range of P1-P2䉝, 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 cooling operation.
r
(3)
lower limit
speed 30rps
(Example) Compressor speed
㻾㼍㼚㼓㼑㻌㻭
㻿㻾㻷㻞㻜㻘㻌㻞㻡㻘㻌㻟㻡
㻾㼍㼚㼓㼑㻌㻮
Range A
31 32
Range B
㻡㻜
㻡㻟
㻡㻞
㻡㻤
㻡㻠
㻼㻝 㻼㻞
㼀㻴㻞㻌㻔㼙㼛㼐㼑㼘㼟㻌㻿㻾㻷㻞㻜㻘㻌㻞㻡㻘㻌㻟㻡㻕㻌㻔
䉝
㻕
㼀㻴㻝㻌㻔㼙㼛㼐㼑㼘㼟㻌㻿㻾㻷㻡㻜㻘㻌㻢㻡㻕㻌㻔
䉝
㻕
Outdoor air tamperature(
䉝
) Outdoor air tamperature(
䉝
)
㻼㻟
㻢㻟
Range A
25 26 31 32
Range B
Range C
㻾㼍㼚㼓㼑㻌㻭
㻿㻾㻷㻡㻜㻘㻌㻢㻜
㻾㼍㼚㼓㼑㻌㻮
㻡㻟
㻡㻝
㻡㻤
㻡㻟
㻢㻟
㻡㻢
㻾㼍㼚㼓㼑㻌㻯 㻠㻣 㻠㻥 㻡㻝
37°C (models SRK50, 60 : 40°C).
38°C or more
25 rps
SRK50, 60
41°C or more
30 rps
47°C or more
40 rps
SRK20, 25, 35 SRK50, 60
Outdoor air temperature (°C)
37 38 40 41
OFF
ON1
ON2
46 47
ON3
Outdoor air temperature (°C)
40 41 46 47
OFF
ON1
ON2
'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)
2.55 8
0 rps
Lower
limit
speed
(c) Cooling overload protective control
(i) Operating conditions
(ii) 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
Item
SRK20, 25, 35
Outdoor air temperature
Lower limit speed
Model
1)
2)
1)
2)
1)
2)
1)
2)
(iii) Reset conditions
Depends on compressor speed
The lower limit of compressor speed is set to 25 or 30 or 40rps.
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 (models SRK20, 25, 35 : TH3 ; models SRK50, 60 : TH2) has become continuously
for 30 seconds at 38°C or more, or 41°C or more, or 47ºC or more with the compressor running, the lower limit speed
of compressor is brought up.
(d) Cooling high pressure control
(i) Purpose
Prevents anomalous high pressure operation during cooling.
(ii) Detector
Outdoor heat exchanger sensor (models SRK20, 25, 35 : TH2 ; models SRK50, 60 : TH1).
(iii) Detail of operation
P1
P2
P3
Outdoor heat exchanger temperature (°C)
8rps
(1)
8rps
(1)
0rps
After lapse of 30 sec. or over
(3)
After lapse of 30 sec. or over
(3)
After lapse of 30 sec. or ove
Notes (1) When the outdoor heat exchanger temperature is in the range of P2-P3䉝, the speed is reduced by 8 rps at each 20 seconds.
(2) When the temperature is P3䉝㻌or higher, the compressor is stopped.
(3) When the outdoor heat exchanger temperature is in the range of P1-P2䉝, 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 cooling operation.
r
(3)
lower limit
speed 30rps
(Example) Compressor speed
㻾㼍㼚㼓㼑㻌㻭
㻿㻾㻷㻞㻜㻘㻌㻞㻡㻘㻌㻟㻡
㻾㼍㼚㼓㼑㻌㻮
Range A
31 32
Range B
㻡㻜
㻡㻟
㻡㻞
㻡㻤
㻡㻠
㻼㻝 㻼㻞
㼀㻴㻞㻌㻔㼙㼛㼐㼑㼘㼟㻌㻿㻾㻷㻞㻜㻘㻌㻞㻡㻘㻌㻟㻡㻕㻌㻔
䉝
㻕
㼀㻴㻝㻌㻔㼙㼛㼐㼑㼘㼟㻌㻿㻾㻷㻡㻜㻘㻌㻢㻡㻕㻌㻔
䉝
㻕
Outdoor air tamperature(
䉝
) Outdoor air tamperature(
䉝
)
㻼㻟
㻢㻟
Range A
25 26 31 32
Range B
Range C
㻾㼍㼚㼓㼑㻌㻭
㻿㻾㻷㻡㻜㻘㻌㻢㻜
㻾㼍㼚㼓㼑㻌㻮
㻡㻟
㻡㻝
㻡㻤
㻡㻟
㻢㻟
㻡㻢
㻾㼍㼚㼓㼑㻌㻯 㻠㻣 㻠㻥 㻡㻝
37°C (models SRK50, 60 : 40°C).
38°C or more
25 rps
SRK50, 60
41°C or more
30 rps
47°C or more
40 rps
SRK20, 25, 35 SRK50, 60
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