User Manual

Siemens Building Technologies Application : 30 RWD82/30 – 04.2001

HVAC Products WD82 1

RWD82/30

RWD82 Universal Controller

Application 30

Room temperature control

Hot water control valve - 3 pos

24Vac control system

Control ( P or PI )

Room temperature control

Proportional control ( 3 position ) of the hot water valve.

Optional day / night set point adjustment.

........RWD82.......

HCV

RWD82/30

HCV

Room temperature sensor

Time clock or switch

Opening output for HCV

Closing output for HCV

3 - position hot water control valve.

Personal computer

Universal analogue input - main sensor

Auxiliary analogue input

Digital input

Digital output

Communication port

• Room temperature sensor can be selected as Ni1000, Pt1000, or active sensor.

• Adjustable proportional band of 3-position output Q1, Q2.

• Integral action function selection and adjustment.

• Timing of 3-position valve actuator

• 24Vac controller supply voltage

• 24Vac three position control valve

• Day / night set points can be selected via time clock or switch.

Supplemental features

Control

Operating modes

PAGE 1
RWD82/30 RWD82 Universal Controller Application 30 Room temperature control Hot water control valve - 3 pos 24Vac control system Control ( P or PI ) Room temperature control Proportional control ( 3 position ) of the hot water valve. X1 S1 Q1 Q2 HCV PC Room temperature sensor Time clock or switch Opening output for HCV Closing output for HCV 3 - position hot water control valve. Personal computer RWD82/30 Optional day / night set point adjustment.
PAGE 2
The temperature sensor senses the room conditions and on a fall in temperature the RWD82 via Q2, Q2 digital outputs modulates the three position heating valve as determined by the heating set point and proportional band settings. Description of operation Three position control has no feedback from the valve actuator to determine it’s position, so the timing of the actuator must be known to the controller. During commissioning the actuator timing must be entered.
PAGE 3
Main Display The main display shows , a) Whether Q1 is On or Off ( = off, = on ) b) Whether Q2 is On or Off ( = off, = on ) c) Whether day or night set point is selected. (¤ = day, d) X1 value ( room temperature) in ° C. = night) Other displays are available by pressing the + button, and the various displays are listed below in sequence from the main display.