-
73
-
'17 • SRK-T-206
'09•SRK-DB-087D
(g) Heating overload protective control
(i) Indoor unit side
1) Operating conditions :
2) Detail of operation :
3) Reset conditions :
(ii) Outdoor unit side
b) Detail of operation
c) Reset conditions:
1)
Operating conditions:
2)
Detail of operation:
(h) Heating low outdoor temperature protective control
3) Reset conditions:
-10 (-2)
-8 (0) 2 (4)
4 (6)
Outdoor air temperature(°C )
10
11
19
20
Normal operation
Protective control ON1
Protective control ON2
Outdoor air temperature(°C)
21
22
Normal operation
Protective
control
Outdoor air temperature(°C)
• Model 50
• Model 50
1)
ࠉ
Operating conditions:
When the outdoor air temperature (TH2) is lower than 4ºC or higher continues for 30 seconds
while the compressor command speed is other than 0 rps.
2)
ࠉ
Detail of operation:
The lower limit compressor command speed is change as shown in the figure belo.
Lower limit 29 rps
Normal operation
4
6
Outdoor air temperature(°C)
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 (TH2) is 17 or 22 (14 or 20)ºC 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.
a) Operating conditions :
b) Detail of operation
When the outdoor air temperature (TH2) is 11ºC 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 78 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 30 rps and even if the calculated result becomes lower than
that after fuzzy calculation, the speed is kept to 30 rps. However, when the
thermo becomes OFF, the speed is
reduced to 0 prs.
rps.
.
c) Reset conditions:
.
a)
b)
30
Protective
control
NO1
NO2
Item
Compressor command speed
Low limit
30 rps
30 rps
Upper limit
78 rps
51 rps
It depends on compressor command speed
Outdoor fan speed
2nd
10
(i) Protective control
I
changed as shown in the figure below.
When the outdoor air temperature (TH2) is lower than 2 (4)ºC or higher continues for 30
becomes 4 (6)ºC.
Lower limit 60 (50) rps
Lower limit 40 (30) rps
Normal operation
Note (1) Values in ( ) are for the model SRK45.
(ii) Protective control
II
(Models SRK20, 25, 35 only)
1) Operating conditions:
When the outdoor heat exchanger sensor (TH1) is -10ºC or lower continuously for 10 min-
utes while the compressor command speed is other than 0 rps.
2) Detail of operation:
Upper limit of compressor command speek is 115rps.
3) Reset conditions:
When the either of the following condition is satisfied.
a) When the outdoor heat exchanger sensor (TH1) becomes -8ºC or higher.
b) When the compressor command speed is 0 rps.
(Example) Fuzzy
Discharge pipe temperature (˚C)
Lower limit
(4)
After lapse of 60 seconds. or over
(3)
After lapse of 60 seconds. or over
(3)
After lapse of 60 seconds. or over
(3)
4 rps
4 rps
(1)
0 rps
90
100
110
(i) Compressor overheat protection
(i) Purpose:
It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting from the
compressor overheat.
(ii) Detail of operation
1) Speeds are controlled with temperature detected by the sensor mounted on the discharge pipe.
Notes (1) When the discharge pipe temperature is in the range of 100 to 110 ºC, the speed is reduced by 4 rps.
(2) When the discharge pipe temperature is raised and continues operation for 20 seconds without changing, then the speed is reduced again by 4
rps.
(3) If the discharge pipe temperature is in the range of 90-100ºC even when the compressor command speed is maintained for 60 seconds when
the temperature is in the range of 90-100ºC, the speed is raised by 1 rps and kept at that speed for 60 second. This process is repeateds until
the command speed is reached.
(4) Lower limit speed
Cooling
Heating
All models
20 rps
30 rps
2) If the temperature of 110ºC is detected by the sensor on the discharge pipe, then the compressor will stop immediately.
When the discharge pipe temperature drops and the time delay of 3 minutes is over, the unit starts again within 1
hour but there is no start at the third time.
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