Control Type - Contemporary Controls BASstat BAST-421C-BW2 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 scheme, 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
UM-15093500-AA1
Page 13