General Description; General Warning - Elcold UNI User Instructions

INSTALLING AND OPERATING INSTRUCTIONS
Digital controller with off cycle
defrost
XR30C

GENERAL WARNING

Please read before using this
manual
• 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 de
scribed hereunder. It cannot be used
as a safety device.
• Check the application limits before
proceeding.
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 at-
mospheric humidity to prevent forma-
tion of condensation
• Warning: disconnect all electrical con-
nections before any kind of mainte-
nance
• Fit the probe where it is not accessible
by the End User. The instrument must
not be opened.
• In case of failure or faulty operation
send the instrument back to the dis-
tributor with a detailed description of
the fault.
• Consider the maximum current which
can be applied to each relay (see
Technical Data).
• Ensure that the wires for probes, loads
and the power supply are separated
and far enough from each other,
without crossing or intertwining.
• In case of applications in industrial
environments, the use of mains filters
(our mod. FT1) in parallel with
inductive loads could be useful.

GENERAL DESCRIPTION

Model XR30C, format 32 x 74 mm, is a digital
termostat with off cycle defrost designed for
refrigeration applications at normal temper-
ature. It provides two relay outputs, one for
the compressor, the other one can be used
for alarm signalling or as auxiliary output. The
probe input can be selected between PTC
or NTC. The instrument has a digital input, for
alarm signalling, for switching the auxiliary
output or for start a defrost cycle. The instru-
ment is fully configurable through special
parameters that can be easily programmed
through the keyboard.
CONTROLLER LOADS
COMPRESSOR
The regulation is performed according to
the temperature measured by the thermo-
stat probe with a positive differential from
the set point: if the temperature increases
and reaches set point plus differential the
compressor is started and then turned off
when the temperature reaches the set point
value again.
In case of fault in the thermostat probe the
start and stop of the compressor are timed
through parameters "COn" and "COF".
DEFROST
Defrost is performed through a simple stop
of the compressor. Parameter "IdF" controls
the interval between defrost cycles, while its
length is controlled by parameter "MdF".
5 User Instructions Low Temperature Freezers Model UNI/LT