User Manual

Siemens Building Technologies Application : 35 RWD82/35 – 04.2001

HVAC Products RWD82 1

RWD82/35

RWD82 Universal Controller

Application 35

Cascade control

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.

Cascade control .

Optional day / night set point adjustment .

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

HCV

RWD82/35

HCV

Room temperature sensor

Supply air temperature sensor

Time clock or switch

Opening output for HCV

Closing output for HCV

3 - position hot water valve.

Personal computer

Universal analogue input - main sensor

Auxiliary analogue input

Digital input

Digital output

Communication port

TX2

• 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

• Duct temperature sensor can be selected as Ni1000, Pt1000, or active sensor.(X2)

• Cascade control of the supply air by the room temperature sensor.

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

Supplemental features

Control

Operating modes

PAGE 1
RWD82/35 RWD82 Universal Controller Application 35 Cascade control 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. Cascade control . X1 X2 S1 Q1 Q2 HCV PC RWD82/35 Optional day / night set point adjustment . Room temperature sensor Supply air temperature sensor Time clock or switch Opening output for HCV Closing output for HCV 3 - position hot water valve.
PAGE 2
The temperature sensor senses the room conditions and on a fall in temperature the RWD82 via Q1, Q2 digital outputs modulates the three position heating valve as determined by the heating set point and proportional band settings. Description of operation Cascade control is where deviation of room temperature from set point adjusts the control point of the leaving air temperature controlling heating .
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.