'20 • SRF-SM-311
-
13
-
(f) Heating high pressure control
(i) Starting condition
When the indoor heart exchanger temperature (Th2) has risen to a specified temperature while the compressor is turned on.
(ii)
Compressor speed is controlled according to the zones of indoor heat exchanger temperature as shown by the following
table.
(g) Heating overload protective control
(i) Indoor unit side
1) Operating conditions
When the outdoor air temperature (TH2) is l7ºC or higher continues for 30 seconds while the compressor command
speed other than 0 rps
2) Detail of operation
The indoor fan is stepped up by I speed step. (Upper limit 9th speed)
3) Reset conditions
The outdoor air temperature (TH2) is lower than 16ºC.
(ii) Outdoor unit side
• Models SRF25, 35
1) Operating conditions
When the outdoor air temperature (TH2) is 22°C or higher continues for 30 seconds while the compressor command
speed other than 0 rps
2) Detail of operation
Upper and lower limits of compressor speed and the outdoor unit fan speed are restricted.
3)
Reset condition
When the outdoor air temperature drops below 21ºC
• Model SRF50
1) Operating condition
When the outdoor air temperature (TH2) is 13°C or higher continues for 30 seconds while the compressor speed is
other than 0 rps
2) Detail of operation
a) Taking the upper limit of compressor speed range at 90(75) rps, if the output speed obtained with the fuzzy
calculation exceeds the upper limit, the upper limit value is maintained.
b) The lower limit of compressor speed is set to 30(40) rps and even if the calculated result lower than that after fuzzy
calulation, the speed is kept to 30(40) rps. However, when the thermostat OFF, the speed is reduced to 0 rps.
c) Inching prevention control is activated and inching prevention control is carried out with the minimum speed set at
40 rps.
d) The outdoor fan speed is stepped down by 3 speed step.(Low limit 2nd speed)
Th2<P1
P1
≦
Th2<P2
P2
≦
Th2<P3
P3
≦
Th2
Protection control speed (NP)
Normal
Retention
NP-4rps
NP-8rps
Sampling time (s)
Normal
20 (10)
20 (10)
20 (10)
Note Value in ( ) are for the model SRF50.
SRF25, 35
Unit:°C
Th2
NP
P1
P2
P3
NP<50
47
52
54
50
≦
NP<92
47.5
55
57
92
≦
NP<115
47.5-39
55-40
57-42
115
≦
NP
39
40
42
SRF50
Unit:°C
Th2
NP
P1
P2
P3
NP<50
45
52
54.5
50
≦
NP<115
45
52
57
115
≦
NP<120
45-43
52-50
57-55
120
≦
NP
43
50
55
Compressor command speed (rps) Outdoor fan
speed
Lower limit
Upper limit
Range A Range B
60
2nd speed
40
Release
)
'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
1) Operating conditions :
2) Detail of operation
3) Reset conditions:
(i)
Operating conditions:
(ii)
Detail of operation:
(h) Heating low outdoor temperature protective control
(iii) Reset conditions:
-10
-8
-2
2
Lower limit 45 rps
Lower limit 40 rps
Normal operation
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 SRK50
• Model SRK50
• Models SRK20 ~ 35
• Models SRK20 ~ 35
(i)
ޓ
Operating conditions:
When the outdoor air temperature (TH2) is lower than 4ºC or 13ºC or higher continues for 30
seconds while the compressor command speed is other than 0 rps.
(ii)
ޓ
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 SRK50
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
When the outdoor air temperature (TH2) is 22ºC or higher continues for 30 seconds while
the compressor command speed other than 0 rps.
a)
b)
c)
d)
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 OFF, the speed is reduced to
0 prs.
rps.
1) Operating conditions :
2) 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.
a)
b)
c)
d)
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 OFF, the speed is reduced
to 0 prs.
rps.
.
3) Reset conditions:
.
1)
2)
30
Protective
control
ON1
ON2
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
23
21
Indoor air temperature (
Υ
Range A
Range B
