Basic Control
SiUS331708EA
43
Functions and Control
∗
Depending on the operating conditions of the compressor, the compressor can be run in an operating mode
different from the modes listed in the table above.
2.3
Electronic Expansion Valve PI Control
Main Electronic Expansion Valve Control
Carries out main electronic expansion valve PI control to maintain evaporator outlet superheated degree (SH) at
constant during heating operation thus making maximum use of the outdoor heat exchanger (evaporator).
The optimum initial value of the evaporator outlet superheated degree is 3°C (5.4°F), but varies depending on the
inverter compressor discharge pipe superheated degree.
Subcooling Electronic Expansion Valve Control
Carries out PI control of subcooling electronic expansion valve to keep the superheated degree (SH) of the outlet
gas pipe on the evaporator side for the full use of the subcooling heat exchanger.
RXSQ24TAVJU
RXSQ36TAVJU
RXSQ48TAVJU
RXSQ60TAVJU
Step
rps
Step
rps
Step
rps
Step
rps
Cooling
Heating
Cooling
Heating
Cooling
Heating
Cooling Heating
1
16
16
1
16
16
1
15
15
1
15
15
2
17.5
17.5
2
17.5
17.5
2
17.5
17.5
2
17.5
17.5
3
19
19
3
19
19
3
19
19
3
19
19
4
20.5
20.5
4
20.5
20.5
4
20.5
20.5
4
20.5
20.5
5
22
22
5
22
22
5
22
22
5
22
22
6
24.5
24
6
24
24
6
24
24
6
24
24
7
27
26
7
26
26
7
26
26
7
26
26
8
28
28.5
8
28.5
28.5
8
28.5
28.5
8
28.5
28.5
9
30
30
9
31
31
9
32
31
9
31
31
10
33
33.5
10
33.5
34.5
10
33.5
33.5
10
33.5
33.5
11
36.5
36.5
11
37
38
11
35
36
11
36.5
37.5
12
40
39.5
12
39.5
39.5
12
37
37
12
38.5
40.5
13
42.5
42.5
13
42.5
42.5
13
40.5
40.5
13
41.5
42.5
14
44.5
45.5
14
45.5
45.5
14
44.5
45.5
14
45.5
45.5
15
47
48.5
15
48.5
48.5
15
48.5
48.5
15
48.5
48.5
16
51
51
16
51.5
51.5
16
51.5
51.5
16
51.5
51.5
17
54.5
54.5
17
54.5
54.5
17
54.5
54.5
17
54.5
54.5
18
58
58
18
58
58
18
58
58
18
58
58
19
61
61
19
60.5
61
19
61
61
19
61
61
20
64
64
20
64
64
20
65.5
64
20
64
64
21
67
67
21
67
67
21
67.5
67.5
21
67.5
67.5
22
70.5
70.5
22
70.5
70.5
22
72
71
22
71
71
23
74
74
23
72
74
23
75
77.5
23
75
75
24
77.5
77.5
24
76
76
24
79
79
24
79
81.5
25
81
81
25
81
77.5
25
83.5
81.5
25
84.5
84.5
26
84.5
84.5
26
84.5
81
26
88
85
26
85
88
27
88.5
88.5
27
88.5
88.5
27
93
93
27
91.5
93
28
92.5
92.5
28
92.5
92.5
28
98
98
28
98
98
29
96.5
96.5
29
96.5
96.5
29
103
103
29
103
103
30
100.5
100.5
30
100.5
100.5
30
109
109
30
109
109
SH = Ts1 – Te
SH: Evaporator outlet superheated degree
Ts1: Suction pipe temperature detected by thermistor R3T
Te: Low pressure equivalent saturation temperature
SH = Tsh
– Te
SH: Evaporator outlet superheated degree
Tsh: Subcooling heat exchanger gas pipe temperature detected
with the thermistor R6T
Te: Low pressure equivalent saturation temperature
Summary of Contents for RXSQ24TAVJU
Page 1: ...Service Manual SiUS331708EA RXSQ24 36 48 60TAVJU Heat Pump 60 Hz...
Page 290: ...Wiring Diagrams SiUS331708EA 277 Appendix RXSQ48TAVJU 3D109546A...
Page 291: ...SiUS331708EA Wiring Diagrams Appendix 278 RXSQ60TAVJU 3D109547A...
Page 295: ...SiUS331708EA Wiring Diagrams Appendix 282 FXZQ05 07 09 12 15 18TAVJU 3D110443A...
Page 298: ...Wiring Diagrams SiUS331708EA 285 Appendix FXEQ07 09 12 15 18 24PVJU 3D098557A...
Page 300: ...Wiring Diagrams SiUS331708EA 287 Appendix FXSQ05 07 09 12 15 18 24 30 36 48 54TAVJU 3D110467B...
Page 301: ...SiUS331708EA Wiring Diagrams Appendix 288 FXMQ07 09 12 15 18 24 30 36 48 54PBVJU 3D093209B...
Page 302: ...Wiring Diagrams SiUS331708EA 289 Appendix FXHQ12 24 36MVJU 3D048116C...
Page 303: ...SiUS331708EA Wiring Diagrams Appendix 290 FXAQ07 09 12 18 24PVJU 3D075354C...
Page 309: ...SiUS331708EA Wiring Diagrams Appendix 296 VAM1200GVJU 3D073270D...