M thermal Mono
16 202008
Midea M thermal Mono
4.7 Spray liquid cooling control
If the discharge temperature exceeds 105 , the solenoid valve opens. While the spray liquid cooling control is in progress,
the discharge temperature is judged every 20s and the frequency of compressor drops 2Hz until the minimum frequency
which differs from every model. When the discharge temperature is below 95 , the compressor runs at the current
frequency and solenoid valve closes.
If the discharge temperature exceeds 108 , the solenoid valve opens. While the spray liquid cooling control is in progress,
the discharge temperature is judged every 20s and the frequency of compressor drops 4Hz until the minimum frequency
which differs from every model. When the discharge temperature is below 95 , the compressor runs at the current
frequency and solenoid valve closes.
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
: Discharge pressure
When the discharge pressure rises above 4.2MPa the system displays P1 protection and the unit stops running. When the
discharge pressure drops below 3.2MPa, 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:
When the suction pressure drops below 0.14MPa the system displays P0 protection and the unit stops running. When the
suction pressure rises above 0.3MPa, the compressor enters re-start control.
P
c
> 4.2MPa
P
c
< 3.2MPa
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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