General Features; Models Available - Carel IR32M Manual

Models available

The electronic controllers of the Infrared series have been specifically designed for the control and regulation
of refrigeration units. These new instruments are microprocessor based and come complete with a LED
display. Carel offers a wide range of models to ensure that the exact instrument is available for your
application at the most competitive price. In brief, here is a list of the main models available:
IR32M An electronic digital thermometer, capable of displaying the temperature from one or two
sensors. It is the ideal solution for applications requiring temperature display. It is possible to
display the temperature of either the first sensor or the second one alternatively by simply
connecting a switch to the thermometer. Additionally, the modification of a specific parameter
will allow you to get the weighted average of the two sensors. For further information see the
parameter '/4' (virtual sensor).
The ideal solution for regulation of 'static' refrigeration units (without evaporator fans) working
IR32S
at normal temperature ranges (above 0ºC). IR32S works both as a thermometer − it displays
the temperature −
IRDRSE
solenoid valve in piped systems) to keep the temperature at the set value. You can select the
IRDRS0
time-interval between successive defrosting cycles as well as their duration. IR32S can be
used simply as a thermostat. In this case it proves to be extremely useful in cooling or
heating applications where it activates compressors, heaters, etc. IR32S, in fact, can work
either in the 'Direct' (Cooling) or 'Reverse' (Heating) functioning mode, by simply selecting the
dedicated parameter (see 'r3' below) or acting on the digital input. The operating temperature
range is 40/90ºC (-40 /130 ºC with PTC sensor).
IR32Y Specifically designed for the control and regulation of 'static' refrigeration units working at low
temperature ranges (below 0ºC), requiring 'active' defrost (that is, electrical or hot gas
defrost). IR32Y, in fact, works not only as a thermometer and a thermostat at the same time,
but it also controls defrost. You can select the time-interval between successive defrost cycles
as well as their duration. Defrosting will be stopped when the defrost end temperature is
reached (it is necessary to connect a defrost sensor to the evaporator). A timed fail safe is
included as standard in the event that the defrost end temperature is not reached. A parameter will
allow you to select the defrost end mode most suitable to your application, i.e.
time/temperature or time/time.
Specifically designed for the control and regulation of ventilated refrigeration units (with
IR32P
evaporator fan) working at low temperatures. It features the same functions described above
for IR32Y plus control of the evaporator fans, thus optimizing their ON/OFF routines in
relation to the specific characteristics of your unit. IR32P has no relays; therefore it is
necessary to add a power card, either the S90RDPW200 or the S90OEM4PWR. The first card
has 3 relays for the control of compressor, fan and defrosting. The compressor relay can
control units up to 1 Hp at 240Vac. The second card has 4 relays; it allows you to enjoy the
benefits of the 'Multifunction output' to operate an auxiliary output (cold room light, de-misting
fan, etc.) or to send a remote alarm signal. Both cards can be powered with either 24 Vac or
240Vac.
IR32C It is a complete solution for the control and the management of ventilated units working at low
temperatures. It performs all the functions of the IR32P model complete with the
IRDRC
S90OEM4PWR card, with everything packed into one case. Thanks to the very latest
technology, we have achieved a unique product that integrates the 4 relays (2000 VA) into a
case just 74mm wide, 72mm deep and 33mm height, without sacrificing performance and
reliability.
Ir96 is a microprocessor based controller designed for the management of freezer with gravity
IR96
or forced-air evaporators. It has 5 relay outputs available to control all the main actuators:
compressor (directly up to 1Hp single-phase), evaporator fans and defrosting. The fourth relay
allows remote signalling of any malfunctioning (high temperature, faulty sensors,...). The fifth
relay can be used to control the unit lights or other auxiliary functions. Two programmable
digital inputs allow innovative performances: automatic alarm management, real time
defrosting, management of lights subjected to the door switch.

GENERAL FEATURES

and as an electronic thermostat: it activates the compressor (or the
1 Cod. +030220151 - Rel. 2.1 - 04/09/98