20
Monitor Mode
When used only to monitor a system, the Control Mode
is set to Wall T-Stat and the interface operates in a monitor
only mode. All control for the zone is provided by the local
unit control and the wall mounted user interface. The only
additional features supported in this mode are:
1.
A monitored Network FSD (ANI) input so that a fire or
smoke detector can override the local unit’s control and stop
the unit’s operation during this alarm condition. This control
overrides any local control by setting the Local Unit ON/OFF
Control to Prohibit to prevent the user from operating the
equipment.
2.
The Zone Temp Sensor Location can be set to appropriately
show the correct position on the graphic.
3.
Provide a zone temperature alarm for annunciating high or low
zone temperature conditions.
4.
Provide the ability to Allow or Prohibit three functions at the
Toshiba User interface; Local Unit ON/OFF Control, Local Op
Mode Control, and Local Setpoint Control.
5.
Provide alarming indication for a dirty filter condition and a
reset function to clear the alarm condition after the filter has
been serviced.
6.
Provide the ability to detect and annunciate communication
errors and failure conditions.
7.
Provide the ability to annunciate alarm conditions present at the
zone control.
Building Automation System (BAS) Control
Mode
When the Control Mode is set to Wall T-Stat, the
interface operates in a control mode. It is used as a BAS
level control and in addition to the features listed above (in
Monitor Mode), it also provides the ability to schedule
occupancy and operate each zone to a setpoint schedule to
adjust the zone’s temperature setpoints based on the
occupancy schedule configured.
A setpoint and occupancy schedule is provided for each
zone that is used to determine when the zone is occupied or
unoccupied. During the occupied period, the zone uses the
heating and cooling setpoints configured for the occupied
period. When the schedule has determined the zone is
unoccupied, the zone utilizes the unoccupied heating and
cooling setpoints.
To allow for setback recovery and provide a smooth
transition from unoccupied to occupied operation, the
Optimal Start algorithm slowly transitions the setpoints
from the unoccupied values to the occupied values over a
period of time prior to the start of the occupied period. The
amount of time is user adjustable, up to 6 hours.
Manual controls provide the ability to disable any zone
by setting the Unit Commanded State to OFF. This
parameter must be set to ON for any operation to occur.
The Mode Control parameter provides the ability to
choose between heating, cooling or allows the unit to
automatically switch modes as required if the Auto mode is
selected. Additionally, the Manual Op Mode Control
provides the ability to lock the unit in a specific mode (must
be set to Inactive for normal operation). Additional manual
overrides are provided for fan speed (Manual Fan Speed
Control) and Louver positioning (Louver Setting) if
applicable.
During the occupied period, the control compares the
current zone temperature to the occupied heating and
cooling setpoints. A cooling mode is required if the zone
temp is above the cooling setpoint while a heat mode is
required if the zone temperature is below the heating
setpoint. It also compares the Mode Control input to any
required mode that may be necessary to determine what
operating modes are permitted.
The mode control can be set to allow for heating only,
cooling only or both heating and cooling. Finally, if a mode
is required and permitted, then if an Outdoor Air
Temperature sensor value is available (provided from the
Network) then a final check is done to determine if the
mode should be disabled due to an OA temp lockout.
If a mode is required and is allowed, the control sends
the appropriate occupied setpoint (heating or cooling) as
required and sends the AUTO fan control mode to allow the
unit to operate the indoor fan at the appropriate speed
required by the local zone control. The mode continues until
after the zone temperature achieves setpoint plus 1 deg
F
for heating or minus 1 deg
F for cooling.
If at any time during the occupied period the local user
initiates a manual change of the setpoint, mode or fan speed
from the wall mounted user interface, the BAS level control
will no longer update those functions until the start of the
next unoccupied period.
During the unoccupied period, the control performs the
same checks as was done during the occupied period above
but utilizes the configured unoccupied setpoints to
determine the zone heating or cooling requirements. During
the unoccupied periods, the zone is determined to require
heat if the zone temperature is greater than 1
F below the
unoccupied heating setpoint and is determined to require
cooling if the zone temperature is greater than 1
F above the
unoccupied cooling setpoint. A 1
F hysteresis is still used
so each mode is satisfied when the zone temperature
reaches the appropriate unoccupied setpoint. When the
unoccupied setpoints are reached, the fan operates at a low
speed to maintain air circulation in the zone.
To transition smoothly from the unoccupied setpoints to
the occupied setpoints, optimal start will begin to ramp the
setpoints starting at the user configured time (4 hours
default) prior to the start of the next occupied period. This
allows the zone to reach the occupied temperature setpoints
at the start of the occupied period.
Summary of Contents for OPN-MTCC
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