Mitsubishi Heavy Industries SRC25ZS-S User Manual

'17 • SRK-T-203
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44
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(21) Protective control function
(a) Dew prevention control [Cooling]
Prevents dewing on the indoor unit.
(i) Operating conditions
When the following conditions have been satisfied for more than 30 minutes after starting operation
1) Compressor’s speed is 22 rps or higher.
2) Detected value of humidity is 68% or higher.
(ii) Contents of operation
1) Air capacity control
Model
Item
SRK20, 25ZSX-S SRK35ZSX-S SRK50, 60ZSX-S
ULO
Upper limit of compressor's speed RangeA: 40rps, RangeB: 24rps RangeA: 45rps, RangeB: 24rps RangeA: 50rps, RangeB: 24rps
Indoor fan 4th speed
LO
Upper limit of compressor's speed RangeA: 40rps, RangeB: 24rps RangeA: 45rps, RangeB: 24rps RangeA: 50rps, RangeB: 24rps
Indoor fan Adaptable to compressor speed
AUTO,HI,MED
Upper limit of compressor’s speed RangeA: 40rps, RangeB: 30rps RangeA: 45rps, RangeB: 30rps RangeA: 50rps, RangeB: 30rps
Indoor fan
Adaptable to compressor speed
Note (1) Ranges A and B are as shown below.
Humidity(%)
68
73
Range A
Range B
'09•SRK-DB-087D
(18)

Outline of cooling operation
(a)
ࠉ
Operation of major functional components in cooling mode
(d) Countermeasure for excessive temperature rise
If it feels excessive temperature rise in heating operation, setting temperature can be lower.
ON OFFOFF
OFFOFF OFF
ON
OFF
(few minutes ON)
OFF
(few minutes ON)
ON ON OFF
Thermostat ON Thermostat OFF Failure
Cooling
Compressor
Indoor fan
Outdoor fan
4-way valve
(b) Detail of control in each mode (Pattern)
(i) Fuzzy operation
12-74rps
12-74rps
12-54rps
12-42rps
SRK35ZSX-S
12-86rps
12-86rps
12-70rps
12-50rps
SRK50ZSX-S
12-58rps
12-58rps
12-38rps
12-34rps
SRK25ZSX-S
12-50rps
12-50rps
12-34rps
12-30rps
SRK20ZSX-S
Model
Fan speed
Auto
MED
HI
LO
12-30rps 12-30rps12-30rps12-30rps
ULO
(b)
(i)
(ii)
(iii)
(c)
(d)
27.5
25.5
18.0
18
30
(20)
ࠉ
Outline of automatic operation
(a)
Determination of operation mode
Heating
Dehumidifying
Cooling
Indoor air temperature (˚C)
Outdoor air temperature (˚C)
Signals of wireless remote control (Display)
–6 –5 –4 –3 –2 –1
±
0+1+2+3+4+5+6
Setting
temperature
Cooling
Dehumidifying
Heating
A
When both the indoor and the outdoor air temperatures are in the range “A”, cooling or heating is switched depending on
the difference between the setting temperature and the indoor air temperature.
When the operation mode has been judged following the change of setting temperature with the remote control, the hourly j-
udgment of operation mode is cancelled.
12-54rps 12-70rps
12-110rps
12-110rps
12-90rps
12-66rps
SRK60ZSX-S
12-30rps
12-90rps12-38rps12-34rps
ECO
Heating
Cooling
SP: Setting temperature
SP
Indoor air
temperature (˚C)
28
Outdoor air temperature (˚C)
(b) Operation mode is changes when keep cooling and heating thermostat off 20 minutes and be satisfied following conditions.
If the setting temperature is changed with the remote control, the operation mode is judged immediately.
(c) When the unit is started again within one hour after the stop of automatic operation or when the automatic operation is
selected during heating, cooling or dehumidifying operation, the unit is operated in the previous operation mode.
(d) Setting temperature can be adjusted within the following range. There is the relationship as shown below between the signals
of the wireless remote control and the setting temperature.
※It can not be changed to heating mode if outdoor air temperature is 28℃ or higher.
Heating
SP: Setting temperature
Indoor air temperature－Setting temperature (˚C)
Keep operation
mode
Cooling
Signals of wireless remote control (Display)
18 19 20 21 22 23
24
25 26 27 28 29 30
18 19 20 21 22 23
24
25 26 27 28 29 30
18 19 20 21 22 23
24
25 26 27 28 29 30
Setting
temperature
Cooling
Heating
SP
＋
1
SP
－
1
Unit : ℃
Operation mode is determined by indoor air temperature and outdoor air temperature as following.
(a) Determination of operation mode
'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, 35ZSX-S
Outdoor air temperature
Lower limit speed
Model
1)
2)
1)
2)
1)
2)
1)
2)
(iii) Reset conditions
(models SRK50, 60 : 25 rps)
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 (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 (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
㻿㻾㻷㻡㻜㻘㻌㻢㻜
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
㻡㻝
㻡㻟
㻡㻝
㻡㻟
㻡㻟
㻡㻤
㻡㻟
㻡㻤
㻡㻢
㻼㻝 㻼㻞
㼀㻴㻝㻔
䉝
㻕
Outdoor air tamperature(
䉝
)
㻼㻟
㻢㻟
㻡㻢
㻢㻟
37°C (models SRK50, 60 : 40°C).
SRK50, 60ZSX-S
47°C or more
40 rps
41°C or more
30 rps
38°C or more
25 rps
'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, 35ZSX-S
Outdoor air temperature
Lower limit speed
Model
1)
2)
1)
2)
1)
2)
1)
2)
(iii) Reset conditions
(models SRK50, 60 : 25 rps)
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 (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 (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
㻿㻾㻷㻡㻜㻘㻌㻢㻜
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
㻡㻝
㻡㻟
㻡㻝
㻡㻟
㻡㻟
㻡㻤
㻡㻟
㻡㻤
㻡㻢
㻼㻝 㻼㻞
㼀㻴㻝㻔
䉝
㻕
Outdoor air tamperature(
䉝
)
㻼㻟
㻢㻟
㻡㻢
㻢㻟
37°C (models SRK50, 60 : 40°C).
SRK50, 60ZSX-S
47°C or more
40 rps
41°C or more
30 rps
38°C or more
25 rps

Mitsubishi Heavy Industries SRC25ZS-S Specifications

General

Brand	Mitsubishi Heavy Industries
Model	SRC25ZS-S
Category	Air Conditioner
Language	English