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L:\Bedienanleitungen\SOREL\DR3\DR3_2003english_040203_mb.p65
Differential Controller DR 3
Subject to technical changes. Illustrations do not claim completeness.
SOREL GmbH Mikroelektronik, Jahnstraße 36, D-45549 Sprockhövel, Tel.: 0 23 39/68 41, Fax: 0 23 39 /60 25
Tmax
R2
Temperatur-Differenzregler
DR
3
Tmax
0III
Storage temp. 54°C
temperature difference controller DR3 for 14 selectable solar heating systems / rotational speed regulation of the solar pump
with adjustable minimal and maximal pump speed / running hours counter, sensor monitor and function control /
various collector protection, storage protection and freeze protection functions / special start logic for vacuum tube collectors
/ priority settings for 2-storage tank and swimming pool systems / menu guiding in German, English, French, Spanish /
easy to operate with 3 input keys and one 1x16-digit LCD display with energy-saving mode /
the adjustments of the controller can be protected against unintentional adjustment by a menu locking device.
Installation and Operating Instructions
edition 2003
The LEDs on the front panel of the DR 3 controller indicate the
current operational status of the system:
LED 0 (red):
- lights in automatic operation when there is no other switching-
on condition for the solar pump(s) or valves than the standby
function
- flashes slowly and continuously as a sign until the operating
mode „manual“ or „off“ is chosen
- flashes quickly to warn when there is a fault like a defect
collector sensor, for example
LED I (green):
lights when the solar pump at relay R1 is switched on
LED II (green):
lights when the pump / the valve at relay R2 is switched on
LED Tmax (yellow):
- lights in automatic operation when the desired max. storage
or swimming pool temperature is reached.
- flashes slowly as a sign for the activated solar protection at
present
- flashes quickly as a sign for the activated freeze protection
Description of the DR 3 Controller
The DR 3 controller is a microprocessor-controlled temperature
difference controller with 3 Pt1000 sensor inputs and 2 relay
outputs, of which the (R1) relay output is provided for the speed
regulator of standard pumps.
The controller has the ability to implement 14 different controller
variations for thermal solar systems, which are illustrated and
described on the following pages.
On a 16 digit display and with 3 keys, the menu will be guided in
the languages German, English, French or Spanish.
Using the three input keys Plus, Minus und Enter,
settings are carried out in the selected menu as well as selected
values like current temperatures,operating hours or operating
state can be displayed.
PT1000 sensors - with guaranteed degree-accuracy according
to DIN EN60751 - provide for precise detection of the temperature
difference, which guarantees the controlled switching
characteristics within the entire operative range.
1


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