Glossary
Aire-Seal: A feature that allows the fan to run slowly to stop backdraft, like a damper.
BMS: Acronym for Building Maintenance System otherwise known as a Building
Automation System (or BAS). It is a computer-based control system installed in buildings
that controls and monitors the building’s electrical equipment such as climate control,
lighting, security etc. It uses communication protocols such as Internet protocols (IP),
BACnet (Building Automation Control network), LON and Modbus.
Control Temp: The temperature (Return or Discharge) that is selected to control.
CRAC: Computer Room Air Conditioning unit that is used primarily to keep electronic
equipment cool and can also be used to control the humidity.
CW: Chilled water cooling. It can also be used to supplement DX cooling.
Default: A starting value of a selection that is set by the factory.
DX: Direct Expansion or cooling supplied by use of a compressor.
Enthalpy: The quantity of energy used to heat or cool the air between two temperatures.
Envelope: An area defined by the evaporator and condenser temperatures that the
compressor is designed to run.
EVD: Electronic Valve Driver that is used to control an electrical expansion valve.
gPOD Is a model that is specifically suited for agricultural applications. It has additional
features of lighting control, CO
2
level control, CO
2
level alarms and Night time
temperature and humidity offsets.
I/O: Inputs and Outputs are broken into two types: digital and analog. Analog inputs are
typically wired to sensors that have variable resistance, voltage or current values. Digital
inputs are normally wired to switches, which are either open (off) or closed (on).
Minidap4: A smaller version of the regular dap4 controller. It has the same processing
power, but is limited in I/O.
NTC: Negative Temperature Coefficient sensor that uses a thermistor to sense
temperature. It is a two-wire device that has a unique non-linear resistance curve.
Therefore, the dap4 must be used with NTC sensors supplied only by Data Aire.
PPM: Parts Per Million. A ratio often used to measure air quality.
VFD: Variable Frequency Drive is used to control the speed of a variable compressor.
“WC: Inches of Water Column is used to measure static or differential air pressure.
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