User Manual

Siemens Building Technologies Application :51 RWD82/51 - 05.2001

HVAC Products RWD82 1

RWD82/51

RWD82 Universal Controller

Application 51

Remote set point

Room temperature control

Chilled water control valve

Chilled water pump output

Control two stage( 2 position )

Room temperature control

2 position control of the chilled water control valve

Digital output to energise chilled water pump ( dependent )

Remote set point adjustment

Optional day / night set point adjustment .

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

RWD82/51

Room temperature sensor

Remote set point adjuster

Time clock or switch

Chilled water pump

2-port two 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.

• Combined adjustable differential of digital outputs Q1 and Q2.

• Adjustable ON position of Q1.

• 24Vac controller supply voltage

• 24Vac two position control valve

• Remote set point adjustment via auxiliary analogue input X2.

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

• Dependent mode for the two cooling outputs, meaning that there is one set point only,

one differential adjustment across combined Q1 and Q2, with the ON position of

Q1adjustable.

Supplemental features

Control

Operating modes

PAGE 1
RWD82/51 RWD82 Universal Controller Application 51 Remote set point Room temperature control Chilled water control valve Chilled water pump output Control two stage( 2 position ) Room temperature control 2 position control of the chilled water control valve Digital output to energise chilled water pump ( dependent ) Remote set point adjustment X1 X2 S1 Q1 Q2 PC Room temperature sensor Remote set point adjuster Time clock or switch Chilled water pump 2-port two position chilled water valve Personal compu
PAGE 2
Description of operation The temperature sensor senses the room conditions and on a rise in temperature the RWD82 via Q1 digital output energises the chilled water pump. A further rise in temperature Q2 opens the two position chilled water valve. In this application the Q1 – ON position should be set to 5 – 10% of the SD differential setting. The remote set point adjuster is connected X2 and adjusts the day set point for Q1, Q2 outputs. The night set point is set on the controller.
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.