UM-15094500-AA0
Page 16
Floating Deadband
The Heat and Cool temperature setpoints could be “attached” together. This means
that as one setpoint is adjusted and “hits” against the deadband region, it will “push” the
deadband region and the other setpoint along the temperature setpoint axis to allow for
adjustment while maintaining the configured deadband. If the setpoint is adjusted back
the other way, it will “pull” the deadband region and the other setpoint along the
temperature setpoint axis.
Minimum Cooling Setpoint and Maximum Heating Setpoint
•
Minimum Cooling Setpoint will be confined by set point low limit plus dead band
and Minimum cooling setpoint [AV-39] default: 18
℃
/ 65
℉
•
Maximum Heating Setpoint will be confined by set point high limit minus dead
band and Maximum heating setpoint [AV-40] default: 25
℃
/ 77
℉
Assigned Current Temperature
A current temperature value can be assigned thru BACnet AV-1 to take place of the
onboard temperature sensor value. The assigned value is valid if BACnet
communication is driving a flip-flop signal to (BV-16: heartbeat signal) within the (AV-
29: Heartbeat Rate time) period (in seconds). Otherwise, the assigned temperature will
revert back to the onboard sensor reading.
Fan Control Output
•
Lowest Fan Speed
is the speed the fan will default to after a control action
(Heating or Cooling) with fan in AUTO mode. If the lowest fan speed [
MSV4
] is
set as “Stop (1)”, the fan will automatically shut off after the control action plus a
2-minute fan-off time delay. During this delay, the AUTO icon will flash. If lowest
fan speed is set to “Low (2)” the fan will run continuously after a control action
•
Fan Mode
can be toggled between AUTO or ON by using the FAN button on the
thermostat or BACnet object [
MSV0
]
Fan Mode
(BACnet supervisor). By
default, this value is set to “Auto(1)”, the AUTO icon is displayed and fan
operation will be controlled automatically. To put the fan in ON mode set
[
MSV0
] to “Low(2)”. This will cause the fan to run continuously (no AUTO icon is
displayed). Fan icon spins when fan is active. The FAN button can be locked to
limit user access to this feature or the BACnet supervisor can be programmed
to default the thermostat to certain state at the end of an occupancy cycle.
•
During heating operations, the supply fan is controlled by the BASstat. This is
enabled by default. (BV15 =1)