User Manual

Siemens Building Technologies Application :40 RWD82/40 - 02.2001

HVAC Products RWD82 1

RWD82/40

RWD82 Universal Controller

Application 40

Room temperature control

Hot water control valve

Chilled water control valve

Control ( 2 position )

Room temperature control

2 position control of the hot water control valve

2 position control of the chilled water control valve

Optional day / night set point adjustment .

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

RWD82/40

Room temperature sensor

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

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

Supplemental features

Control

Operating modes

PAGE 1
RWD82/40 RWD82 Universal Controller Application 40 Room temperature control Hot water control valve Chilled water control valve Control ( 2 position ) Room temperature control 2 position control of the hot water control valve 2 position control of the chilled water control valve X1 S1 Q1 Q2 PC RWD82/40 Optional day / night set point adjustment . Room temperature sensor Time clock or switch 2-position hot water valve 2-position chilled water valve.
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, 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.