Daikin RXSQ24TAVJU, Руководство по обслуживанию, Страница: 56 / 311

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