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给个老外的高压控制逻辑供参考, R410a的机器.
High head pressure protection
The condenser fans modulate from 30% to 100% to control the compressor discharge pressure, targeting a nominal value of 425 psi (2930 kPa)目标压力2.93Mpa. However, it is possible that the discharge pressure could continue to rise above this value even with the condenser fans running at 100%. Thus, additional safeguards are built-in to the control algorithm.
In Spot Cooling configuration with discrete capacity control, if the discharge pressure exceeds 520 psi (3585 kPa)如果排气压力高于3.58MPa, the HGBV will be opened up to 50% in an attempt to reduce the pressure热气旁通阀打开50%. In all other configurations, if the refrigerant discharge pressure exceeds 535 psi (3690 kPa)如果排气压力高于3.69Mpa, the HGBV will be opened up an additional 35% from its current position热气旁通阀打开当前位置增加35%. This safeguard will reduce the unit’s cooling capacity, which is preferable to a total loss of cooling.
If the discharge pressure reaches approximately 550 psi (3790 kPa), the compressor will automatically shutdown当压力超过3.79MPa, 压缩机自动关闭, and a High Discharge Pressure alarm will be generated. The compressor will re-start automatically after its normal minimum off time of two minutes, if a cooling demand is present. The High Discharge Pressure alarm will automatically be cleared at this time. If three high discharge pressure alarms occur within a 30 minute window, then unit requires that the user to manually clear the alarm condition before the unit will attempt to restart.
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