'20 • SR-SM-285
-
10
-
Outdoor air temperature (°C)
37 38
40 41
OFF
ON1
ON2
Outdoor air temperature (°C)
40 41
46 47
OFF
ON1
ON2
46 47
ON3
'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
(b) Cooling overload protective control
( i ) 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)
(i)
(ii)
(i)
(ii)
(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 (TH3) 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.
45
(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 45 rps and even if the calculated result becomes
lower than that after fuzzy calculation, the speed is kept to 30 or 45 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.
'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)
(i)
(ii)
(i)
(ii)
(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.
(c)
( i )
( ii )
(iii)
6
6
㻞㻡
㻠㻤
㻡㻟
㻡㻡
㻡㻟
㻡㻤
㻢㻟
㻠㻣
㻡㻜
㻡㻟
6
30
temperature
(d) Cooling low outdoor temperature protective control
( i ) Operating conditions
When the outdoor air temperature (TH3) is 22ºC or lower continues for 20 seconds while the compressor com-
mand speed is other than 0 rps.
( ii ) Detail of operation
1)
The lower limit of the compressor command speed is set to 50
〈44〉
(30) rps and even if the speed becomes
lower than 50
〈44〉
(30) rps, the speed is kept to 50
〈44〉
(30) rps. However, when the thermo OFF, the speed
is reduced to 0 rps.
2)
The upper limit of the compressor command speed is set to 50
〈
50
〉
(60) rps and even if the calculated result
becomes higher than that after fuzzy calculation, the speed is kept to 50
〈
50
〉
(60) rps.
Notes (1) Values in
〈
〉
are for outdoor air temperature is A or BºC
(2) Values in ( ) are for outdoor air temperature is C or DºC
'09•SRK-DB-087D
( f ) Heating overload protective control
( i ) Indoor unit side
1)
2)
3)
( ii) Outdoor unit side
b) Detail of operation
Model 50
A
B
C
D
RPSmin < 40
40 <= RPSmin < 80
80 <= RPSmin < 90
90 <= RPSmin < 102
102 <= RPSmin
49
53
41
53 ~ 47
47 ~ 41
53
57
45
57 ~ 51
51 ~ 45
55
59
47
59 ~ 53
53 ~ 47
58
62
51
58
51
1) Operating conditions
When the outdoor air temperature (TH3) is 22ºC or higher continues for 30
seconds while the compressor command speed other than 0 rps.
i)
ii)
iii)
iv)
Taking the upper limit of compressor command speed range at 60 rps, if the output speed obtained with the fuzzy
calculation exceeds the upper limit, the upper limit value is maintained.
The lower limit of compressor command speed is set to 40 rps and even if the calculated result becomes lower than
that after fuzzy calculation, the speed is kept to 40 rps. However, when the
thermo becomes OFF, the speed is
reduced to 0 prs.
rps.
Operating conditions
Detail of operation
Reset conditions
9
3
3
Summary of Contents for SRR25ZS-W
Page 79: ... 20 SR SM 285 78 ...
