Control Type - Contemporary Controls BASstat BAST-421C-B2 User Manual

User Mode Flow Chart

Control Type

4.2
Control Type, System Mode and Algorithm Configuration
System modes available to the user are dependent on control type.
4-Pipe Cooling or Heating with Auto Changeover – This the default control type in this
thermostat. Mostly used for standalone operation. The thermostat will switch between Cool and
Heat modes automatically. In this control type, the user will be presented with a choice of Heat
or Ventilation@Heat when the thermostat is in Heat mode (automatic), and Cool or
Ventilation@Cool when the thermostat is in Cool mode (automatic).
4-Pipe Cooling or Heating with Manual Changeover – In this control type the thermostat will
wait for a command from user or BACnet supervisor to switch between Cool and Heat modes.
The user will be presented with a choice of Heat or Ventilation@Heat when the thermostat is in
Heat mode, and Cool or Ventilation@Cool when the thermostat is in Cool mode. The user can
choose to switch between Cool and Heat modes using the MODE button.
BACnet controlled – In this control type the built-in thermostat algorithm can be bypassed, and
the thermostat can be controlled over the BACnet network with commands from the supervisor
device. The logic executing in the supervisor (such as Niagara or Sedona logic) can control the
thermostat over the BACnet network. To put the thermostat in BACnet network control mode,
use the Lock [AV18] object bit 9: Control DOs by thermostat algorithm "0" (default) or BACnet
UM-15093000-AA1
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