Midea M-Thermal A Series - Protection Control

M thermal Split
202004 23
Part 3
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Control
4.6 Outdoor Fan Control
The speed of the outdoor unit fan is adjusted in steps, as shown in Table 3-4.1.
Table 3-4.3: Component control during cooling operation
Fan speed index
Fan speed (rpm)
4/6/8/10kW 12/14kW
16kW
W1 200 200 200
W2 250 250 250
W3 300 300 300
W4 350 350 350
W5 400 400 400
W6 450 450 450
W7 500 500 500
W8 530 550 550
W9 550 580 600
W10 580 610 650
W11 600 630 700
W12 600 650 730
5 Protection Control
5.1 High Pressure Protection Control
This control protects the refrigerant system from abnormally high pressure and protects the compressor from transient
spikes in pressure.
Figure 3-5.1: High pressure protection control
Notes:
1.
P
c
:
Discharge
pressure
When the discharge pressure rises above 4.3MPa the system displays P1 protection and the unit stops running. When the
discharge pressure drops below 3.6MPa, the compressor enters re-start control.
5.2 Low Pressure Protection Control
This control protects the refrigerant system from abnormally low pressure and protects the compressor from transient
drops in pressure.
Figure 3-5.2: Low pressure protection control
Notes:
1.
P
e
:
Suction
pressure
P
c
> 4.3MPa P
c
< 3.6MPa
Normal operation
High pressure protection, error code P1 is displayed
P
e
< 0.14MPa
P
e
> 0.30MPa
Normal operation
Low pressure protection, error code P0 is displayed
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