User Manual

Siemens Building Technologies Application :41 RWD82/41 - 02.2001

HVAC Products RWD82 1

RWD82/41

RWD82 Universal Controller

Application 41

Remote set point

Room temperature control

Hot water control valve

Chilled water control valve

Control 2 stage on / off ( 2 position )

Room temperature control

2 position control of the hot water control valve

2 position control of the chilled water control valve

Remote set point adjustment

Optional day / night set point adjustment .

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

RWD82/41

Room temperature sensor

Remote setpoint adjuster

Time clock or switch

2-position hot water valve

2-position chilled water 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 dead zone with separate heating and cooling set points.

• Adjustable differential of digital output Q1.

• Adjustable differential of digital output Q2.

• 24Vac controller supply voltage

• 24Vac two position control valves

• Remote set point adjustment via auxiliary analogue input X2.

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

Supplemental features

Control

Operating modes

PAGE 1
RWD82/41 RWD82 Universal Controller Application 41 Remote set point Room temperature control Hot water control valve Chilled water control valve Control 2 stage on / off ( 2 position ) Room temperature control 2 position control of the hot water control valve 2 position control of the chilled water control valve Remote set point adjustment X1 X2 S1 Q1 Q2 PC RWD82/41 Optional day / night set point adjustment .
PAGE 2
Description of operation The temperature sensor senses the room conditions and on a fall in temperature the RWD82 via Q1 digital output opens and closes the two position heating valve as determined by the heating set point and differential settings. The temperature sensor senses the room conditions and on a rise in temperature the RWD82 via Q2 digital output opens and closes the two position chilled water valve as determined by the cooling set point and differential settings.
PAGE 3
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, = night) d) X1 value ( room temperature) in ° C. e) Auxiliary application selected ( REM for remote set point adjustment ) Other displays are available by pressing the + button, and the various displays are listed below in sequence from the main display.