5.3.2 Indoor electronic expansion valve control
1
After supplying power, the electronic expansion valve closes
fully before starting to open.
2
When the compressor stops, the electronic expansion valve
closes fully to set its opening.
3
When it starts (the compressor is activated), the electronic
expansion valve opens to a specific degree during cooling
operation, 1 minute.
4
During heating operation, the electronic expansion valve opens
to a specific degree.
5
During defrost, the electronic expansion valve opens to a
specific degree, as indicated in the graph.
6
Normal opening of the electronic expansion valve.
Cooling operation
1
Superheat temperature setting required:
a
Heat exchanger SH:
•
3 HP => SH = 0 °C
•
4 HP=> SH = -4 °C
b
Heat exchanger SH = Tg - TL
Tg: Indoor gas pipe temperature.
TL: Indoor liquid pipe temperature.
SH: Superheat.
2
Simulated PI control for the electronic expansion valve. the opening of this valve is controlled so that the SH temperature
of the heat exchanger can reach the set temperature.
Heating operation
1
Definition of the set temperature:
a
Heat exchanger SH:
Ti < TL < 45 + 0.5 x Ta
TL: Indoor liquid pipe temperature.
Ti: Indoor air inlet temperature.
Ta: Outdoor temperature.
2
Simulated PI control for the electronic expansion valve. the opening of the electronic expansion valve is controlled so
that the temperature of the indoor liquid pipe can reach the set temperature.
5 Control system
177
SMGB0063 rev. 1 - 10/2010
5
Summary of Contents for Econofresh
Page 2: ......
Page 4: ...Index ii SMGB0063 rev 1 10 2010 ...
Page 12: ...Index x SMGB0063 rev 1 10 2010 ...
Page 24: ...1 General information 12 SMGB0063 rev 1 10 2010 ...
Page 88: ...2 Unit installation 76 SMGB0063 rev 1 10 2010 ...
Page 169: ... KPI 3002H2E heat recovery unit 4 Electrical wiring 157 SMGB0063 rev 1 10 2010 4 ...
Page 170: ...4 Electrical wiring 158 SMGB0063 rev 1 10 2010 ...
Page 192: ...5 Control system 180 SMGB0063 rev 1 10 2010 ...
Page 234: ...6 Optional functions 222 SMGB0063 rev 1 10 2010 ...
Page 252: ...9 1 RCD 1 0 3 0 FSN2 9 Spare parts 240 SMGB0063 rev 1 10 2010 ...
Page 254: ...9 2 RCD 4 0 5 0 FSN2 9 Spare parts 242 SMGB0063 rev 1 10 2010 ...
Page 256: ...9 3 RPC 4 0 6 0 FSN2E 9 Spare parts 244 SMGB0063 rev 1 10 2010 ...
Page 258: ...9 4 RPI 0 8 1 5 FSNE 9 Spare parts 246 SMGB0063 rev 1 10 2010 ...
Page 260: ...9 5 RPI 8 0 10 0 FSN2E 9 Spare parts 248 SMGB0063 rev 1 10 2010 ...
Page 262: ...9 6 RPIM 0 8 1 5 FSNE DU 9 Spare parts 250 SMGB0063 rev 1 10 2010 ...
Page 264: ...9 7 RPK 1 0 1 5 FSN2E 9 Spare parts 252 SMGB0063 rev 1 10 2010 ...
Page 268: ...9 9 RPK 2 0 FSN2E 9 Spare parts 256 SMGB0063 rev 1 10 2010 ...
Page 270: ...9 10 RPK 2 5 4 0 FSN2E 9 Spare parts 258 SMGB0063 rev 1 10 2010 ...
Page 272: ...9 11 RPF 1 0 2 5 FSN2E 9 Spare parts 260 SMGB0063 rev 1 10 2010 ...
Page 274: ...9 12 RPFI 1 0 2 5 FSN2E 9 Spare parts 262 SMGB0063 rev 1 10 2010 ...
Page 276: ...9 Spare parts 264 SMGB0063 rev 1 10 2010 ...
Page 407: ......
