Outdoor System Control Function - Haier MRV5-H Service Manual

6.4 Outdoor System Control Function

6.4.1 Compressor Control
Generally, the compressor frequency is controlled according to the target Ps during cooling.
During the control process, Pd, Td/TOIL, PS, etc. are given priority.
Generally, the compressor frequency is controlled according to the target Pd during heating.
During the control process, Pd, Td/TOIL, PS, etc. are given priority.
Single and double compressor switching based on system load and compressor frequency during dual compressor
operation.
6.4.2 Electronic Expansion Valve Control
Cooling:
when startup, the electronic expansion valve is maintained at 100 pls and the electronic expansion valve is fully
open after startup.
Heating:
When heating, the electronic expansion valve is usually superheated to 39 Fahrenheit. SH = Toci1-ET=39 (°F)
6.4.3 Fan Motor Control
① Control of MRV 5-H series DC motor
The air supply speed of outdoor unit can be set from speed 0 to 22 in accordance with the operating mode.
The operating is commonly at speed 1 - 22, and it is CVT (Continuously Variable Transmission) control between
speed 1 and 22.
② Air supply motor: range of number and rotating speed (unit: rpm)
< Outdoor fan motor control (usually control / high static pressure control) >
Level
24 (high static pressure)
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Double Fan
1100+1100
1020+1020
1000+1000
970+970
910+910
860+860
800+800
770+770
650+650
560+560
520+520
460+460
410+410
360+360
330+330
300+300
280+280
210+210
190+190
280
230
200
160
0
61
Single Fan
1000
1000
940
920
880
845
820
760
710
680
640
610
560
520
475
440
415
370
320
280
230
200
160
0