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Siemens Building Technologies Application :22 RWD82/22 - 05.2001

HVAC Products RWD82 1

RWD82/22

RWD82 Universal Controller

Application 22

Absolute limit control

Room temperature control

Two stage electric heating

Control 2 stage digital

Room temperature control

Two stage ON / OFF electrical heating

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

Optional day / night set point adjustment .

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

RWD82/22

HLT

Room temperature sensor

Limit temperature sensor

Time clock or switch

First stage electric air heater

Second stage electric air heater

Personal computer

High limit thermostat

Pressure switch

Heater relay

Universal analogue input - main sensor

Auxiliary analogue input

Digital input

Digital output

Communication port

HLT

Digital output

• Room temperature sensor can be selected as Ni1000, Pt1000, or active sensor.

• 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

• Duct temperature sensor can be selected as Ni1000, Pt1000, or active sensor.

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

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

• Independent mode for the two heating outputs.

•

A high limit manual reset thermostat is mounted downstream of the air electric heater,

and de-energises the heater on excessive duct temperatures. This thermostat has to

be manually reset following detection of overheating. It is often supplied by the

supplier of the electric heater.

• A pressure switch is also specified to detect loss of static pressure in the duct,

indicating loss of fan. This also de-energises the electric heater but it is auto reset and

allows electric heater function following the detection of fan operation.

• These safety units can be connected directly in series with small electric heaters, but

for larger electric heaters they are connected to a heater contactor switching the

electric heater.

Supplemental features

Control

Operating modes

Safety functions

Summary of content (3 pages)

PAGE 1
RWD82/22 RWD82 Universal Controller Application 22 Absolute limit control Room temperature control Two stage electric heating Control 2 stage digital Room temperature control Two stage ON / OFF electrical heating Absolute maximum and / or minimum limit control of the supply air. S1 X1 X2 S1 Q1 Q2 PC HLT PS HR RWD82/22 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 energises stage 1 of the electric heater. On a further fall in temperature, Q2 digital output energises stage 2 of the electric heater. The limit duct sensor senses the supply air temperature, and maintains the absolute (actual) maximum and / or minimum supply air temperatures.
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.