User Manual

Siemens Building Technologies Application :46 RWD82/46 - 02.2001

HVAC Products RWD82 1

RWD82/46

RWD82 Universal Controller

Application 46

W / S mode selection - digital

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

Winter / Summer selection of heating or cooling operation of Q1 output by X2

Optional day / night set point adjustment .

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

RWD32/46

Room temperature sensor

Outside air thermostat

Time clock or switch

2-position hot / chilled 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

• Outdoor air temperature sensor can be selected as Ni1000, Pt1000, or active

sensor.(X2)

• Winter / summer selection of heating or cooling mode of the Q1 output as selected by

digital input into auxiliary input X2 sensing outside air temperature.

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

Supplemental features

Control

Operating modes

PAGE 1
RWD82/46 RWD82 Universal Controller Application 46 W / S mode selection - digital 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 Winter / Summer selection of heating or cooling operation of Q1 output by X2 X1 X2 S1 Q1 Q2 PC RWD32/46 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
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.