User Manual

Siemens Building Technologies Application :60 RWD82/60 - 02.2001

HVAC Products RWD82 1

RWD82/60

RWD82 Universal Controller

Application 60

Room temperature control

Refrigeration solenoid valves

Control 2 stage digital

Room temperature control

Two stage ON / OFF refrigeration cooling

Optional day / night set point adjustment .

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

RWD82/60

Room temperature sensor

Time clock or switch

Refrigeration solenoid valve

Refrigeration solenoid 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.

• Two stage on / off cooling

• Adjustable differential of digital output Q1.

• Adjustable set point of Q1.

• Adjustable differential of digital output Q2.

• Adjustable set point of Q2.

• 24Vac controller supply voltage

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

• Independent mode for the two cooling outputs.

Supplemental features

Control

Operating modes

PAGE 1
RWD82/60 RWD82 Universal Controller Application 60 Room temperature control Refrigeration solenoid valves Control 2 stage digital Room temperature control Two stage ON / OFF refrigeration cooling X1 S1 Q1 Q2 PC RWD82/60 Optional day / night set point adjustment . Room temperature sensor Time clock or switch Refrigeration solenoid valve Refrigeration solenoid valve.
PAGE 2
Description of operation The temperature sensor senses the room conditions and on a rise in temperature the RWD82 via Q1 digital output opens and closes the stage 1 refrigeration solenoid valve as determined by the cooling set point and differential setting. On a further rise in temperature the RWD82 via Q2 digital output opens and closes the stage 2 refrigeration solenoid 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.