CNT-SVX04A-EN
Sequence of operation
72
Use Rover service tool to edit the maintenance required setpoint time. Once the
setpoint limit is exceeded, the controller generates a Maintenance Required
informational diagnostic. When the maintenance required setpoint time is set
to zero, the controller disables the diagnostic feature.
You can use Rover service tool to clear the Maintenance Required informational
diagnostic. Once the diagnostic is cleared, the controller resets the fan run time
to zero and begins accumulating fan run hours again.
Data sharing
Because this controller utilizes LonWorks
®
technology, the controller can send
or receive data (setpoint, heat/cool mode, fan request, space temperature, etc.)
to and from other controllers on the communication link, with or without the
existence of a building automation system. This applies to applications where
multiple zone controllers share a single space temperature sensor (for rooms
with multiple units but only one zone sensor) for both stand-alone (with
communication wiring between units) and building automation system
applications.
Additional information on the setup and application of this feature can be found
in “Stand-alone peer-to-peer” on page 84.
Other modes
Dehumidification
Dehumidification is possible when mechanical cooling is available, the heating
capacity is located in the reheat position, and the space relative humidity
setpoint is valid. The controller starts dehumidifying the space when the space
humidity exceeds the humidity setpoint. The controller continues to dehumidify
until the sensed humidity falls below the setpoint minus the relative humidity
offset. This sequence is not available for face and bypass units.
The controller uses the cooling and reheat capacities simultaneously to
dehumidify the space. While dehumidifying, the discharge air temperature is
controlled to maintain the space temperature at the current setpoint.
A typical scenario involves high humidity and high temperature load of the
space. The controller sets the cooling capacity to 100% and uses the reheat
capacity to warm the discharge air to maintain space temperature control.
If the unit is in the unoccupied mode, the
dehumidification routine will not operate.
Economizing is disabled during dehumidification. Dehumidification may be
disabled via configuration.
