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USER
INTERFACE
4.5.1.2 Setpoints
There are four occupied heating and cooling setpoint pairs and one unoccupied setpoint pair. The pair is in effect when
the corresponding schedule is active. A minimum dead band of one degree between heat and cool setpoints is enforced,
however, a dead band of at least two degrees is recommended.
4.5.1.3 Date and Time
Set the date and time to ensure correct scheduling.
4.5.1.4 System Mode
There are six system modes:
•
Off: All relays and analog outputs are set to their inactive state; no control is performed.
•
Auto:
Controls both heating and cooling.
•
Heat:
Controls only heating.
•
Cool:
Controls only cooling.
•
Off+Recirc:
Same as Off but with fan recirc enabled.
•
Emergency Heat: Controls only auxiliary heating (heat pump only)
The system mode setting screen edits the BACnet object System Mode (MSV-1000). This value is automatically reflected
by the control in the BACnet object Active System Mode (MSV-1005) at priority 16. If the Active System Mode is currently
commanded from the network (at a priority higher than 16), a warning is shown when entering the screen and any chang
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es made will cancel the network override.
4.5.1.5 Schedule
There are four occupied weekly setpoint pairs (A,B,C,D), one unoccupied setpoint pair, and holidays that may be sched
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uled. Weekly schedules are created using setpoint pairs and start times. Each setpoint pair can be used multiple times to
create up to eight schedule changes per day. At midnight each day the system automatically transitions to unoccupied,
which uses the unoccupied heating and cooling setpoints. If no schedule changes are set for a particular day, the Ubiqu
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iSTAT will be unoccupied for that entire day. If a schedule requires an occupied setpoint at midnight a schedule change
must be created for midnight (12:00 AM) in order to defeat the default behavior. Holiday schedules are available with
thirty (30) entries. Select new and choose month, day and year for a single occurrence where the system will revet to the
unoccupied mode.
Different from SZ Series Thermostats: Schedules no longer start and stop as they did on TCS SZ thermostats.
Schedules now only transition from schedule to schedule.
The examples below assume the following setpoints:
•
Occupied A: heat=70, cool=75 (best suited for customer comfort in a store)
•
Occupied B: heat=65, cool=80 (best suited for after-hours employee work in store)
•
Unoccupied: heat=60, cool=80 (most economical when building is unoccupied)
Normal Schedule Example:
This schedule represents a business that opens at 8:00AM and closes at 5:00 PM weekdays.
By default each day begins as Unoccupied at 12:00 AM.
Figure 9
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Occupied A @
8:00 AM
Occupied A @
8:00 AM
Occupied A @
8:00 AM
Occupied A @
8:00 AM
Occupied A @
8:00 AM
Unoccupied @
5:00 PM
Unoccupied @
5:00 PM
Unoccupied @
5:00 PM
Unoccupied @
5:00 PM
Unoccupied @
5:00 PM
12:00 AM Monday (midnight)
: The automatic transition to Unoccupied has no effect because the system was already
Unoccupied.
