Haier MRV5-H - 6.4 Outdoor System Control Function; 6.4.1 Compressor Control

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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
6.4.3 Fan Motor 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)
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 Double Fan Single Fan
24 (high static pressure) 1100+1100 1000
22 1020+1020 1000
21 1000+1000 940
20 970+970 920
19 910+910 880
18 860+860 845
17 800+800 820
16 770+770 760
15 650+650 710
14 560+560 680
13 520+520 640
12 460+460 610
11 410+410 560
10 360+360 520
9 330+330 475
8 300+300 440
7 280+280 415
6 210+210 370
5 190+190 320
4 280 280
3 230 230
2 200 200
1 160 160
0 0 0