Data Sheet for Application

Application sheet VAV285
A6V12189441_en--_a 3 | 11
Function description
Basic functions
● PID control for volume flow control of supply and
exhaust air, room pressurization with room air
pressure sensor, temperature and air quality
● The following priority prevails if functions conflict:
1. Room pressure control, 2. Air change rate, 3.
Temperature control.
● Alarms for room pressurization and ventilation
● Room pressurization with door contact to freeze
room pressure control loop
● The room operator unit measures temperature,
humidity, and air quality (CO2).
● The application allows customers to adjust the
room temperature setpoints and rapid ventilation
via the room operator unit
● Display of room air quality on room operator unit
● The operating modes are Comfort, Pre-Comfort,
Economy and Protection
● The air flow for heating and cooling is operated in
sequence to the valves. Parallel operation can be
configured
● Supports VAV damper actuators for supply and
exhaust air 0…10 V.
● Regular automatic pressure sensor calibration
(DXA.S04P…)
Options
● Exhaust VAV actuator 0…10 V
● PID control LTHW radiator heating
● Heating and cooling coils with 3-position valves
controlled via triac outputs
● Control for supply air humidification
● Downdraft compensation
● Outside temperature (for downdraft compensation)
distributed over BACnet
● Optimal energy efficiency by including the option
for room/supply air cascade control, presence
detector or window contact
● Optional system alarms displayed on the
management station notify building operators of
possible faults
● Optional trends can be activated for room sensors
Auxiliary functions
● Rapid ventilation
● Air volume flow tracking for positive and negative
room air pressure
● Supply air functions to coordinate demand signals
for pressure optimized fan control
● Green Leaf function (energy saving indication)
● Multisegment use of DXR2 automation stations
with VAV application
● Control via central commands (e.g. scheduler for
room operating mode)
● Central optimum start control provides best room
comfort at the start of occupancy
● Central operation or reset of setpoints, timed valve
kick function or outside temperature dependent
heating limit
● Central override functions for valves
● Emergency function with maximum air change rate
at a constant pressure
● Seasonal compensation of room temperature
setpoints
● Configurable, generic universal control functions
for free I/Os
Variants
● PWM constant (including spring return) or PWM
thermal control can be selected for valves
● Room operator unit and sensor variants:
KNX PL-Link wall-mount sensor
KNX PL-Link flush-mount room operator unit
KNX PL-Link flush-mount sensors
Analog exhaust air temperature sensor
● KNX PL-Link sensor or binary sensor detects
presence