Warnings - York YGWH 115 Installation, Commissioning & Operation

Form 6S6I-B01C-EOMA-EN (0318)

Warnings

Code 501: Warning-Evaporator Low Pressure Force Unload
This warning is set after the compressor is running, whenever the Evaporator Pressure is less than the 'Low Press.
Force Unload Setpoint', the unit will force unload and the message will be displayed. This warning releases and
capacity is recovered to automatic control after the Evaporator Pressure is larger than the 'Low Press. Force Unload
Setpoint'.
The default value of 'Low Press. Force Unload Setpoint' is as below:
Air-conditioner/Heat Pump: 175kPa;
Ice-Storage: 101kpa.
Code 502: Warning-Condenser High Pressure Stop Load
This warning is set after the compressor is running, whenever the Condenser Pressure is more than the 'High
Press. Stop Load Setpoint', the unit will stop load and the message will be displayed. This warning releases and
capacity is recovered to automatic control after the Condenser Pressure is less than the 'High Press. Stop Load
Setpoint - 100kPa' and lasts for 5 minutes.
The default value of 'High Press. Stop Load Setpoint' is as below:
Air-conditioner/Ice-Storage: 1030kPa;
Heat Pump: 1286kPa; High Temperature Heat Pump: 1660kPa.
Code 503: Warning-Condenser High Pressure Force Unload
This warning is set after the compressor is running, whenever the Condenser Pressure is more than the 'High
Press. Unload Setpoint', the unit will stop load and the message will be displayed. This warning releases and
capacity is recovered to automatic control after the Condenser Pressure is less than the 'High Press. Stop Load
Setpoint - 100kPa' and lasts for 5 minutes.
The default value of 'High Press. Unload Setpoint' is as below:
Air-conditioner/Ice-Storage: 1060kPa;
Heat Pump: 1303kPa; High Temperature Heat Pump: 1685kPa.
Code 504: Warning-Standby Freeze Protection Pump On
This warning is set when the system is stopped, and for Air Conditioner, Heat Pump or High Temperature Heat
Pump mode: Leaving Condenser Temperature, Return Condenser Temperature, Leaving Chilled Temperature, or
Return Chilled Temperature is lower than 2.0 °C; and for Ice Storage: Leaving Condenser Temperature or Return
Condenser Temperature is lower than 2.0 °C, or Leaving Chilled Temperature or Return Chilled Temperature is lower
than 'Low Temp. Stop Setpoint', and the liquid pump is turned on. This warning is released if Leaving Condenser
Temperature and Return Condenser Temperature are higher than 8.0 °C and Leaving Chilled Temperature and
Return Chilled Temperature are higher than 'Low Temp. Stop Setpoint' + 6.0 °C, and the liquid pump is turned off.
This fault is not applied if 'Standby Anti-Freezing' is disabled.
Code 505: Info-System No Load
When the unit is stopped and ready to start, only the leaving temperature is not in the Load section, this message will
be displayed and the unit can not start. This message is released if the leaving temperature is in the Load section.
Code 506: Warning-Evaporator Low Pressure Stop Load
This warning is set after the compressor is running, whenever the Evaporator Pressure is less than the 'Low Press.
Force Unload Setpoint + 25kPa', the unit will stop load and the message will be displayed. This warning releases
and capacity is recovered to automatic control after the Evaporator Pressure is larger than the 'Low Press. Force
Unload Setpoint + 25kPa'.
Code 511: Warning-SYS1 Discharge High Temperature Force Unload
This warning is set after the 1# compressor is running, whenever the 1# compressor discharge temperature is larger
than the 'LICO Open Dischar. Temp. Setpoint + 5°C', and the motor current is higher than the MLA multiplied by
80%, the unit will force unload and the message will be displayed. This warning releases and capacity is recovered
to automatic control after the 1# compressor discharge temperature is lower than the 'LICO Open Dischar. Temp.
Setpoint'.
The default value of 'LICO Open Dischar. Temp. Setpoint' is : 80°C.
Code 512: Warning-SYS1 Discharge High Temperature Force Load
This warning is set after the 1# compressor is running, whenever the 1# compressor discharge temperature is
larger than the 'LICO Open Dischar. Temp. Setpoint + 5°C', and the motor current is lower than the MLA multiplied
by 65%, the unit will force load and the message will be displayed. This warning releases and capacity is recovered
to automatic control after the 1# compressor discharge temperature is lower than the 'LICO Open Dischar. Temp.
Setpoint'.
8-6 EN