Honeywell Design and Application Technical Reference Manual page 215

Non-Integrated Economizer— An
economizer control that does not connect
to the thermostat for call for cooling and/
or turns off the economizer cycle after a
set time to turn on the mechanical
cooling.
Proportional Band— In a modulating
controller, the control point range through
which the controller output varies through
a predefined range (3 to 15 PSI - 21 to
103 kPa, 2 to 10 volts, 1 to 100%).
Sometimes expressed in percent of
primary sensor span. Commonly used
equivalents are "throttling range" and
"modulating range", usually expressed in
degrees of temperature.
Sensing Element— A device or component
that measures the value of a variable
such as temperature or humidity.
Setpoint— The value at which the controller is
set such as the desired room temperature
on a commercial thermostat, the
changeover point for dry bulb economizer
changeover or a changeover ppm level of
CO2 in a room for demand control
ventilation.
Throttling Range— In a modulation controller,
the control point range through which the
controlled variable must pass to move the
final control element through its full
operating range. Expressed in values of
the controlled variable such as degrees,
percent relative humidity, or pressure in
pounds per square inch or kPa. Also
referred to as "proportional band". For a
modulating commercial thermostat, the
temperature change required to drive the
manipulated variable from full off to full
on.
Total Heat— Same as enthalpy.
Two-Position— A basic on-off control circuit in
which the device being controlled is either
full on or full off with no intermediate
operating positions available. Also
referred to as "on-off" control.
Volatile Organic Compound (VOC)— One of
a class of chemical components that
contain one or more carbon atoms and
are volatile at room temperature and
normal atmospheric pressure. In indoor
air, VOCs are generated by such sources
as tobacco smoke, building products,
furnishings, cleaning materials, solvents,
polishes, cosmetics, deodorizers and
office supplies.
'Wild Economizer'— A mixed air control
circuit in which outside air is used virtually
on a continuous basis whether or not
there is a call for cooling or occupancy
from the controlled area. This can be very
inefficient in some applications and raise
heating costs.
Zoning— The practice of dividing a building
into sections for heating and cooling
control so that one controller is sufficient
to control the heating and cooling
requirements for the section.
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APPENDIX
63-8594-02 Honeywell Economizers