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User Setup – Discharge Control Setup
Discharge Control Setup Screen
An electric condenser water-regulating valve is
standard on chillers with a water-cooled condenser.
The valve is a butterfly type valve with a modulating
actuator and is located in the condenser water
piping at the outlet of the condenser. The valve
regulates the flow of cooling water through the
condenser in order to maintain the discharge
refrigerant pressure set point.
On remote air-cooled chillers with EC fan control, the
analog output will ramp all fans up and down
simultaneously in order to achieve discharge
pressure setpoint.
Figure 53 - User Setup – Discharge Control Setup
Screen
Table 15 – Discharge Control Setup Parameters
Menu Item
Description
Default Value
Mode
In Auto Mode, the fans adjusts to
maintain optimum performance.
In manual mode, it holds to the
Manual Mode Position input
valve.
AUTO
Kp
Proportional PID value
0.015
Ti
Integral PID value
150.000
Td
Derivative PID value
0.000
Discharge
Setpoint
Discharge Setpoint Value
350 PSIG
Low Temp
Setpoint
Low temp setpoint relating to low
percent setpoint – (During the
start sequence)
45°F (7°C)
On remote air-cooled chillers with fixed fan stages
and a variable header fan, the analog output will
ramp the variable header fan up and down and
activate the fixed fan stages in order to achieve
discharge pressure setpoint.
Figure 54 - User Setup – Discharge Control Setup
Screen (Remote Air Cooled)
Table 16 – Discharge Control Setup Parameters
Menu Item
Description
Default Value
Kp
Proportional PID value
0.005
Ti
Integral PID value
250.000
Td
Derivative PID value
0.000
