Assortment / System Description

VAV application
Water register 2-pipe system, heating only
18
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18.17 Water register 2-pipe system, heating only
Figure: 2-pipe system VAV applications, heating only
Key:
DXR2… Room automation station R1 Room operator unit
YS Supply air VAV D1 Presence
YH Hot water heating coils D2 Window contact
Y Output signal TR Room temperature
SpH Effective heating setpoint SpC Effective cooling setpoint
YH Heating valve
Figure: Modulating heating sequence
18.18 Actuators
The DRX2 automation station controls heating/cooling valves via Triac and
analog outputs, regardless of available I/Os. 3-position actuators, thermal pulse
width modulation (PWM) actuators, PWM actuators with return spring can be
connected to the Triac outputs.
A maximum of 1 thermal valve can be connected to each Triac on the DXR2
automation station with AC 230 V power.
Conventional 0…10V actuators as well as 6-port valves can be connected to
analog outputs.
Plant diagram
Sequences