User Manual

Siemens Building Technologies Application :53 RWD82/53 - 05.2001

HVAC Products RWD82 1

RWD82/53

RWD82 Universal Controller

Application 53

Relative limit control

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 )

Relative maximum and / or minimum limit control of the supply air.

Optional day / night set point adjustment .

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

RWD82/53

Room temperature sensor

Limit temperature sensor

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

• Relative maximum and / or minimum supply air temperature control.

• 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
RWD82/53 RWD82 Universal Controller Application 53 Relative limit control 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 ) Relative maximum and / or minimum limit control of the supply air.
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.
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.