Contemporary Controls BAST-221C User Manual page 18

System Mode
• The default control type is 2-stage cooling and heating with automatic changeover.
This makes the thermostat operate fully stand-alone. Control Type can be selected
in (tyPe) or [MSV7] or [MSV8]. Manual Changeover control type allows restriction of
mode selection to Cool only or Heat only in applications where necessary.
Occupied Cooling [AV0] and Heating [AV3] set points and Unoccupied Cooling
•
[AV8] and Heating [AV9] setpoints can be set individually for cooling and heating
modes, with either manual or automatic changeover control. Minimum deadband
[AV7] can be programmed as well.
For cooling/ heating with manual changeover control, cooling or heating can be
•
selected by pressing the MODE button or using a BACnet command to object [
MSV1]. In application where user control needs to be limited, the lock button
function can be used to disable MODE button.
Fan Control Output
Fan Output for Heating - the fan output for Heat mode is disabled "0" in [BV15] by
•
default. The thermostat lets the RTU circuity control the fan during Heat mode. Fan
output can be enabled "1" for Heat mode if desired [BV15].
Lowest Fan Speed is the speed the fan will default to after a control action (Heating
•
or Cooling). If the lowest fan speed [MSV4] is set as "Stop (1)", the fan will be
automatically shut off after the control action (Heating or Cooling) and a 2-minute
fan-off time delay. During this delay time, the AUTO icon will be flashing, and the fan
will shut off after the 2-minute time delay expires. If lowest fan speed is set to "Low
UM-15090000-AA4 Page 18