Design Flexibility -
The FC and PC Series are available with a complete line of options that
let the design engineer customize a control package to meet the
requirements of even the most complex system. Options include:
- Electronic to Pneumatic Transducer that
converts the 0-10 volt controller output signal into a 3 to 15 psig
control signal, to accommodate fan or damper control by pneumatic
actuators. An instrument air source (18-30 psig) at the center is
necessary for such an installation.
- Low System Static Selection for use where
multiple pressure sensing points are specified - typically, large variable
air volume (VAV) systems. Includes additional transmitters and circuitry
to select the lowest sensed signal and process it for indication and
control.
- Summing of Multiple Flow Rates for use where
multiple airflow measuring elements are located in branch ducts of a
single fan system or individual ducts of a multiple fan system. Includes
additional transmitters, square root extractors, scaling relays, and
circuitry to produce a total air volume signal for indication and control.
- Auxiliary Setpoints for providing morning
warm-up, night setback, or programmed reduction or increases in the flow,
static, or space pressure levels. Setpoints can be activated by dry
contacts or electrical or pneumatic signals. Each auxiliary setpoint has
an operational status LED indicator.
- High Duct Pressure Override circuitry to
reposition or shut down the fan system in the event of a sudden rise in
fan intake or discharge static (caused by closure of a main fire damper,
etc.)
- Independent Readout of Process Signal on Magnehelic
Gauges instead of LED readouts. Control centers can be furnished with
diaphragm-actuated, differential pressure gauges mounted on the enclosure
door. Meters are scaled in cfm (air volume) and feet per minute (air
velocity), or inches of water column (system static or space pressure
level).
- Additional LED Readouts for non-controlled
ducts or systems or where individual indication is specified on a system
with summing or low signal selection. This option includes additional
transmitters, square root extractors, scaling circuitry, and LED displays.
- Multiple Control Functions in a Single Center
can be grouped and inter connected for multiple and complex airflow and
pressure applications.
