User Manual

Siemens Building Technologies Application : 78 RWD32/78 – 04.2001

HVAC Products RWD32 1

RWD32/78

RWD32 Universal Controller

Application 78

Maximum priority

Room temperature control

Chilled water control valve- 3

230Vac control system

Control ( P or PI )

Room temperature control

Proportional control of the 3 position chilled water valve.

Maximum priority function to control the cooling valve.

Optional day / night set point adjustment .

........RWD32.......

CCV

RWD82/75

CCV

N1-3

Room temperature sensor

Input from other controllers

Time clock or switch

Opening output for CCV

Closing output for CCV

3 - position chilled water control valve

Temperature controllers.

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 proportional band of 3-position output Q1, Q2.

• Integral action function selection and adjustment.

• Timing of 3-position valve actuator

• 230Vac controller supply voltage

• 230Vac three position control valves

• The cooling coil control valve is controlled by the highest call for cooling from a

number of zones via the priority function in the temperature controller

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

Supplemental features

Control

Operating modes

PAGE 1
RWD32/78 RWD32 Universal Controller Application 78 Maximum priority Room temperature control Chilled water control valve- 3pos 230Vac control system Control ( P or PI ) Room temperature control Proportional control of the 3 position chilled water valve. Maximum priority function to control the cooling valve.
PAGE 2
Description of operation The temperature sensor senses the room conditions and on a rise in temperature the RWD32 via Q1, Q2 digital outputs modulates the three position cooling valve as determined by cooling set point and proportional band 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, b = night) d) X1 value ( room temperature) in ° C. Other displays are available by pressing the + button, and the various displays are listed below in sequence from the main display.