Contemporary Controls BASstat BAST-221C-BW2, Руководство пользователя, Страница: 19 / 42

UM-15090500-AA1 Page 18
This feature is useful for thermostat models with multiple fan speeds.
• Fan Mode can be toggled between AUTO or CONTINUOUS by using the FAN
button on the thermostat (user) or BACnet object [MSV0] Fan Mode (BACnet
supervisor). By default, this value is set to “Auto(1)”, the AUTO icon is displayed,
and the fan will be controlled automatically. To put the fan in CONTINUOUS
mode set to “Low(2)” this will cause the fan to run continuously (no AUTO icon is
displayed). Fan icon spinning when fan is active. Optionally, 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.
Short Cycle and Maximum Cycles per Hour
• There are short cycle and maximum cycles per hour protection for both cooling
and heating modes [AV23 – 26] Cooling Short Cycle Delay, Cooling Maximum
Cycles per Hour and Heating Short Cycle Delay, Heating Maximum Cycles per
Hour.
•
The short cycle time (in minutes) will determine the minimum on time and
minimum off time of each stage before changing its state. The default setting is
3 minutes.
• Maximum cycles per hour will count the number of cycles in an hour. When the
cycle count reaches the maximum cycles in an hour, it won’t allow additional
cycles until the next hour.
•
When a stage change is pending due to a Short Cycle Delay or a Maximum
Cycle count, the Clock icon ) will appear on the LCD.
•
To disable short cycle checking, set the short cycle to 0 minutes. NOTE: Do not
use this value unless the heating and cooling equipment is equipped with an
internal timer. Damage to equipment may occur.
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°C/65°F
•
Maximum Heating Setpoint will be confined by set point high limit minus dead
band and Maximum heating setpoint [AV-40] default: 25°/77°F
Assigned Current Temperature