Table of Contents
Advertisement
Operating Procedures
Figure 22. Flash tank level
a. The chiller includes a second modulating valve to
control Flash Tank Level.
b. Negative Gain indicates reverse-acting. It can be
used for either inlet or outlet level control.
c. If level hits max level, solenoids close to prevent
introduction of liquid at the interstage port of the
compressor.
3. Brazed-Plate Suction Superheat with or without
solenoid control.
Figure 23. Brazed-plate suction superheat
a. Works with independent temperature and pressure
sensor on the brazed-plate heat-exchanger.
b. Suction superheat setpoint maintained on the
compressor interstage line.
c. Negative Gain indicates reverse-acting PI loop.
Barrel Isolation
Common Features:
•
User-Settable time delay on valve close, helps keep
from dead-heading pumps.
•
Up to 4 fluid circuits available.
38
•
HOA works on all isolation valves – setting control in
had opens all valves.
Control Algorithms:
•
Disabled – No barrel isolation control.
•
Compressor
–
System configures each compressor to a fluid
circuit.
–
When a compressor is called to start, the
associated barrel isolation valve opens.
–
When all compressors on a fluid circuit are off, and
circuit is not lead, then barrel isolation valve is
closed.
•
Cooling EN
Figure 24. Barrel isolation control screen
Tonnage and Power Calculations
When a user clicks the graphic display of demand,
capacity, and speed, the tonnage and power data pop-up
page is displayed.
Figure 25. Power and Capacity control screen
Power and Consumption
The power calculations start from the physical value,
Power, from the compressors – a totalized instantaneous
ARTC-SVX007A-EN
Advertisement
Table of Contents
