Sinclair SCV-EB Series Service Manual page 17

During heating operation, the four-way valve is on; during cooling and defrosting operations, the four-way valve is off.
4.6 Electronic expansion valve control
The position of the electronic expansion valve (EXV) is controlled in steps from 0 (fully closed) to 480 (fully open/standby
position).
 At power-on:
 The EXV first closes fully, then moves to the standby position.
 After the compressor runs, the EXV is controlled according to suction superheat, discharge temperature,
pressure and compressor speed.
 When the outdoor unit is in standby:
 The EXV is at standby position.
 When the outdoor unit stops:
 The EXV first opens fully and remains for 30 seconds, then closes fully, then moves to the standby position.
4.7 Outdoor fan control
The speed of the outdoor unit fan is adjusted in steps, as shown below
Fan speed index
5kW
W1 200
W2 250
W3 300
W4 350
W5 400
W6 450
W7 470
W8 530
W9 550
W10
W11
W12
7kW
200
250
300
350
400
450
470
530
550
/ 590
/ 650
/ /
Fan speed (rpm)
9kW 12kW
200 200
250 250
300 300
350 350
400 400
450 450
470 530
530 600
550 650
590 730
650 780
/ /
14kW 16kW
200 200
250 250
300 300
350 350
400 400
450 450
530 530
600 600
650 650
730 730
780 780
820 820
15