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Siemens Building Technologies Application :27 RWD82/27 - 02.2001

HVAC Products RWD82 1

RWD82/27

RWD82 Universal Controller

Application 27

W / S mode selection - analogue

Room temperature control

One stage electric heating

Package unit – 1 heat, 1 cool

Control 2 stage digital

Room temperature control

One stage ON / OFF electrical heating

One stage heat – one stage cool - package unit

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

Optional day / night set point adjustment .

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

RWD32/24

HLT

Room temperature sensor

Outside air temperature sensor

Time clock or switch

First stage package unit heat / cool

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

• O / A 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.

• 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
RWD82/27 RWD82 Universal Controller Room temperature control One stage electric heating Application 27 W / S mode selection - analogue Package unit – 1 heat, 1 cool Control 2 stage digital Room temperature control One stage ON / OFF electrical heating One stage heat – one stage cool - package unit Winter / Summer selection of heating or cooling operation of Q1 output by X2 S1 X1 X2 S1 Q1 Q2 PC HLT PS HR RWD32/24 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 controlling the heating output of the reverse cycle package unit. On a further fall in temperature, Q2 digital output energises stage 2 switching the electric heater.
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.