Main screen
The Main Screen displays the equipment status (chiller start or stop, operating, pumps ON or OFF,
purge pump ON or OFF, and chilled and cooling water pumps ON or OFF). Also, the operating
status of the various modes of chiller operation.
Operating status
On the upper left of the screen, underneath the LOCAL and REMOTE buttons, is a list of options.
Each has a lamp to indicate on or off for the following:
• Startup: Lights if the chiller is ready to start. Light is off if the chiller is stopping or if it is not
ready to start.
• Steam V Lo Hold: The steam condensate control valve low limit light is on if the steam
condensate control valve low limit is operating. The steam condensate control valve stays in the
low position before the automatic temperature control process runs.
• Temp. Control: Light is lit if the temperature control of the microcomputer panel changes to RUN
status. Turns off if the chiller stops.
• Thermo OFF: Lights if the chilled water temperature falls to the automatic stop temperature.
Turns off when the temperature rises enough to support an automatic restart.
• Load Limit: Light is lit if the load restriction activates due to the cooling water temperature,
refrigerant temperature, or generator temperature or pressure is higher than the set point. Light
turns off when the load restriction is removed.
• Dilution: Light is lit during the dilution operation after the chiller stops. It turns off when the
dilution operation is complete.
Set Point: The set point of chilled water leaving temperature is shown on the left of the screen.
The system illustration lights (lines fill in) when the system is operating.
An illustration of the system shows the following information:
• Steam condensate control output
• Chilled water entering / leaving temperature
• Cooling water entering / leaving temperature
• Refrigerant temperature
• Absorber temperature
• Generator temperature
• Purge tank pressure
• Generator pressure
• Generator concentration
This screen shows the status of the equipment in the chiller process diagram.
Items in the chiller process diagram are:
117YHAU-C Single Effect Steam-Fired Absorption Chiller
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