1592031000 Univ-R4 GB - r1.0 - 08.04.2011.doc Universal-R 4/19
2. GENERAL WARNING
WARNING: The Universal-R should always be installed by a suitable qualified person, in accordance with best
electrical and refrigeration practice. Take time to read the instructions. Do not exceed the relay ratings. The
Universal-R should not be considered a safety device, use suitable safety cutout devices when appropriate.
This manual is part of the product and should be kept near the instrument for easy and quick reference.
The instrument shall not be used for purposes different from those described hereunder. It cannot be used as a safety device.
Check the application limits before proceeding.
2.1 SAFETY PRECAUTIONS
Check the supply voltage is correct before connecting the instrument.
Do not expose to water or moisture: use the controller only within the operating limits avoiding sudden temperature changes with high
atmospheric humidity to prevent formation of condensation
Warning: Disconnect all electrical connections before any kind of maintenance.
The instrument must not be opened.
Fit the probes where they are not accessible by the End User.
In case of failure or faulty operation send the instrument back to the distributor with a detailed description of the fault.
Do not exceed the maximum current that can be applied to each relay (see Technical Data).
Ensure that the wires for probes, electrical loads and the power supply are separated and far enough away to each other, without
crossing or intertwining.
In case of applications in industrial environments, the use of mains filters (our mod. DIXL930) in parallel with inductive loads could be
useful.
Heating applications – Do not exceed 105°C with the NTC probes supplied. For higher temperatures (up to a maximum of 150°C)
use special PTC probes (e.g. our Part No. DIXL957).
3. GENERAL DESCRIPTION
Model Universal-R is a 71x29 mm format microprocessor based controller, suitable for applications on high, medium or low temperature
refrigeration units. It is provided with three relay outputs to control compressor, defrost - which can be both electrical or hot gas - and
evaporator fans. It can work with PTC or NTC probes. Where defrost is being terminated by time, it can operate with just one thermostat
probe. Where defrost is being terminated by temperature, it has an input for an evaporator probe(s).
The Universal-R is equipped with an internal alarm buzzer, a flashing visual alarm as well as a 4th relay (volt free) that can be configured
as Auxiliary or Alarm, to control a heater in Dead Band control (see parameter oAC) or to control the defrosting of a second evaporator
(when “tC” parameter is set to 6).
Double evaporator defrost: When tC=6, the controller is set up to defrost twin evaporators. Defrost of both evaporators will start
simultaneously but each evaporator will terminate defrost individually on temperature. Only when both evaporators have terminated defrost,
will the controller revert to refrigeration.
Each instrument is fully configurable through special parameters that can be easily programmed through the keypad.
(28 pages)
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