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VAV-SVP01A-EN
VAV VV550 Controller Device Home Tabs: Instructions
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Heating Setpoint Low Limit
These setpoint limits apply only to the occupied and occupied standby, heating and cooling
setpoints. They do not apply to the unoccupied heating and cooling setpoints. When the controller
is in the unoccupied mode, it always uses the unoccupied heating and cooling setpoints. Unit
configuration enables or disables the local (hardwired) setpoint. This parameter provides
additional flexibility to allow you to apply communicated, hardwired, or default setpoints without
making physical changes to the unit. Similar to hardwired setpoints, the effective setpoint value for
a communicated setpoint is determined based on the stored default setpoints, configuration
values, and the controller occupancy mode.
Freeze Avoidance
Outdoor Air Low Limit:
Units with hot water coils installed are susceptible to freezing. Measures
must be taken to prevent the water coils from freezing. Freeze protection occurs only when the
controller is in the Off state or during the unoccupied period when the primary air valve is closed
and the reheat is disabled. During occupied operation, the control algorithm indirectly provides
freeze protection.
Note:
On Ventilation Flow control mode with hot water only
Additional Fields
Enable Thumbwheel Setpoints:
Unit configuration enables or disables the local (hardwired)
setpoint. This parameter provides additional flexibility to allow you to apply communicated,
hardwired, or default setpoints without making physical changes to the unit. If the thumbwheel is
not enabled, locally generated overrides (maximum flow or minimum flow) are not possible.
Enable Thumbwheel Star and Double Star Function:
Single star and double star airflow
override capability can be disabled through configuration, while leaving the thumbwheel local
setpoint enabled. Positioning the thumbwheel at the single star (*) generates an override to cooling
minimum flow. The override is enabled when the setpoint is greater than 88°F (31.11°C) and
disabled when the setpoint is less than 87.7°F (30.94°C).
Positioning the thumbwheel at the double star (**) generates an override to cooling maximum
flow. The double star function is enabled when the setpoint is less than 48.5°F (9.17°C) and disabled
when the setpoint is greater than 50°F (10°C).
There is no effect on the fan and the reheat operation during the single star and double star
thumbwheel airflow overrides. When the single star and double star thumbwheel airflow overrides
are active, the default space setpoints are used, the reported local setpoint reports the invalid value.
Setpoint values outside of the valid setpoint range (50°F to 85°F [10.0°C to 29.44°C]) are not used.
Enable Auto calibration:
Calibration takes place if this auto calibration feature is enabled and
either a power cycle or a transition from occupied to unoccupied has occurred. The building
automation system is responsible for the staggering of the calibration sequence that is needed
between units. When auto-calibration is enabled and a transition from occupied to unoccupied
occurs, the calibration sequence starts after a fixed delay of three minutes. The controller effective
occupancy mode is unoccupied, but runs like it is occupied during this three-minute period. The
mode field of reported unit status reports shows when the controller is in the calibration sequence.
Содержание VAV VV550 LonTalk
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