Advertisement
6 Protec on Control
6.1 High Pressure Protec on Control
This control protects the system from abnormally high pressure and protects the compressors from transient spikes in
pressure.
When the discharge pressure rises above 4.4MPa the system displays P1 protec on and the unit stops running. When the
discharge pressure drops below 3.2MPa, the compressor enters re-start control.
6.2 Low Pressure Protec on Control
This control protects the system from abnormally low pressure and protects the compressors from transient drops in
pressure.
When suc on pipe pressure drops below 0.05MPa the system displays P2 protec on and the unit stops running. When the
suc on pipe pressure rises above 0.14MPa, the compressor enters re-start control.
6.3 Discharge Temperature Protec on Control
This control protects the compressors from abnormally high temperatures and transient spikes in temperature. It is
performed for each compressor.
Figure 3-6.3: High discharge temperature protec on control
Discharge temperature ≥ 115°C
When the discharge temperature rises above or equal to 115°C the system displays P4 protec on and the unit stops running.
When the discharge temperature drops below 90°C, the compressor enters re-start control.
Figure 3-6.1: High pressure protec on control
Normal opera on
P
> 4.4MPa
c
High pressure protec on, error code P1 is displayed
Notes:
1. P
: Discharge pressure
c
Figure 3-6.2: Low pressure protec on control
Normal opera on
P
< 0.05MPa
e
Low pressure protec on, error code P2 is displayed
Notes:
P
: Suc on pressure
1.
e
Normal opera on
High discharge temperature protec on, error code P4 is displayed
P
< 3.2MPa
c
P
> 0.14MPa
e
Discharge temperature < 90°C
23
Advertisement
