CleaverBrooks ADAC 1000, Руководство по эксплуатации

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Chapter 2 — System Components
Part No. 750-386 2-9
2.3-Optional Accessories
2.3.1 - Sensors
• Water Level, 4-20mA signal, one per tank (Fig. 2-10).
•Header Pressure Transmitter, 4-20 mA signal (used for pump lead/
lag and alternation), one per tank for common headers (Fig. 2-11).
Required on common headers; required for transfer header.
2.3.2 - Variable Frequency Drives for Pumps
An optional Variable Frequency Drive (VFD) controls the speed of
the pump motor for enhanced pressure/flow control and reduced
electrical energy consumption.
Drives are NEMA 1 and are supplied with line reactors.
2.3.3 - Recirculation Valve Control
This option (standard on single tank systems) allows the ADAC
system to close off the recirculation piping, sending all of the pump
flow out to the boiler. When the system detects sufficient flow to
protect the pump, the valve closes. When demand drops, the valve
opens, allowing flow back to the tank and protecting the pump.
2.3.4 - Magnetic Level Transmitter
The level transmitter is made up of four components:
• Stainless steel chamber with 2 process connections
• Level indicator consisting of magnetically interlocked flags in a
plastic housing strapped to the chamber.
• Transmitter junction box containing the circuit board and sensor
tube.
• Magnetic float (shipped loose).
Sensor resolution is 3/8”.
Figure 2-10
Figure 2-11
Figure 2-12 Variable Frequency
Drives