Mitsubishi SRK Series User Manual

-
73
-
'18 • SRK-T-250
'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
SRK20-35 SRK50
Outdoor air temperature
Lower limit speed
Model
1)
2)
1)
2)
1)
2)
1)
2)
(iii) Reset conditions
(model SRK50 : 23 rps)
Depends on compressor speed
47°C or more
35 rps
The lower limit of compressor speed is set to 30 or 45 (model SRK50 : 27 or 35) 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 (model SRK50 : 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.
Outdoor air temperature (°C)
40 41 46 47
OFF
ON1
ON2
41°C or more
27 rps45 rps
(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
P1
P2
P3
Outdoor 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 ove
Notes (1) When the outdoor heat exchanger temperature is in the range of P2-P3䉝, the speed is reduced by 6 rps at each 30 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 30 seconds at the same speed, it returns to the normal cooling operation.
r
(3)
lower limit
speed 30 (model SRK50 : 29) rps
(Example) Compressor speed
㻾㼍㼚㼓㼑㻌㻭
㻿㻾㻷㻞㻜㻘㻌㻞㻡
㻿㻾㻷㻟㻡㻘㻌㻡㻜
㻾㼍㼚㼓㼑㻌㻮
㻾㼍㼚㼓㼑㻌㻭
㻾㼍㼚㼓㼑㻌㻮
Range A
31 32
Range B
㻠㻣
㻡㻟
㻠㻤
㻡㻟
㻡㻜
㻡㻤
㻡㻟
㻡㻤
㻡㻟
㻼㻝 㻼㻞
㼀㻴㻝㻔
䉝
㻕
TH1(
䉝
)
㻼㻟
㻢㻟
㻡㻡
㻢㻟
'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
SRK20-35 SRK50
Outdoor air temperature
Lower limit speed
Model
1)
2)
1)
2)
1)
2)
1)
2)
(iii) Reset conditions
(model SRK50 : 23 rps)
Depends on compressor speed
47°C or more
35 rps
The lower limit of compressor speed is set to 30 or 45 (model SRK50 : 27 or 35) 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 (model SRK50 : 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.
Outdoor air temperature (°C)
40 41 46 47
OFF
ON1
ON2
41°C or more
27 rps45 rps
(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
P1
P2
P3
Outdoor 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 ove
Notes (1) When the outdoor heat exchanger temperature is in the range of P2-P3䉝, the speed is reduced by 6 rps at each 30 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 30 seconds at the same speed, it returns to the normal cooling operation.
r
(3)
lower limit
speed 30 (model SRK50 : 29) rps
(Example) Compressor speed
㻾㼍㼚㼓㼑㻌㻭
㻿㻾㻷㻞㻜㻘㻌㻞㻡
㻿㻾㻷㻟㻡㻘㻌㻡㻜
㻾㼍㼚㼓㼑㻌㻮
㻾㼍㼚㼓㼑㻌㻭
㻾㼍㼚㼓㼑㻌㻮
Range A
31 32
Range B
㻠㻣
㻡㻟
㻠㻤
㻡㻟
㻡㻜
㻡㻤
㻡㻟
㻡㻤
㻡㻟
㻼㻝 㻼㻞
㼀㻴㻝㻔
䉝
㻕
TH1(
䉝
)
㻼㻟
㻢㻟
㻡㻡
㻢㻟
'09•SRK-DB-087D
(e) Cooling low outdoor air temperature protective control
(i) Operating conditions
(ii) Detail of operation
CDAB
OFF
EF
Upper 2
Lower 2
ON
ON
Upper 3
Lower 3
ON
Upper 1
Lower 1
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 20 sec. or over
(3)
After lapse of 20 sec. or over
(3)
After lapse of 20 sec. or over
(3)
lower limit
speed 30(27) rps
(Example)
Compressor
speed
Temperature list
Models SRK20, 25, 35
ABCD
RPSmin < 50
50
<
=
RPSmin < 92
92
<
=
<
=
RPSmin 115
First time
After the
second times
Outdoor air temperature (˚C)
ABCDEF
(Models SRK20-35)
First time
After the
second times
Outdoor air temperature (˚C)
ABCD
(Model SRK50)
9
16 19
11
Note (1) Value in ( ) are for the model SRK50.
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)
Lower 3Upper 2Lower 2
Lower 1
Upper 1
Range ARange B
Upper 3
2624
Outdoor air temperature (Υ
)
50504430 50
Range A
Range B
−5044
60
6027
Release
Release −
SRK20, 25, 35
SRK50
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.
fanspeed 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
47
47.5
47.5 - 39
52
55
55 - 40
54
57
57 - 42
58
61
61

Mitsubishi SRK Series Specifications

General

Brand	Mitsubishi
Model	SRK Series
Category	Air Conditioner
Language	English