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Fig. 1.b - ir33DIN
Fig. 1.c - powercompact - powercompact small
Fig. 1.a - ir33, ir33 power
Fig. 1.d - MasterCella
ENGLISH
ir33 +030220441 - rel. 2.0 - 01.05.2006
1. INTRODUCTION
The ir33 platform for refrigeration is a complete range of products made up of integrated electronic
microprocessor controllers with LED display, designed especially for the control of stand-alone refrigeration
units: These controllers are especially suitable in applications that require high load switching power, a
considerable number of outputs, functions and control with direct access from the keypad, high front
panel IP and, at the same time, a compact shape that signifi cantly reduces the overall dimensions.
The irr33 range is easy to install and ensures optimisation of production times for the manufacturer in
mass production.
Numerous models are available, providing the best solution for each application at the most competitive
price.
1.1 Main features
Power supply
Models are available with power supply in the following versions: 12Vac, 12 to 24 Vac/dc (switching),
230Vac or 115 to 230 Vac (switching).
All the models, furthermore, feature a low power mode to increase immunity to voltage drops.
When the voltage inside the instrument falls below a certain threshold, the unit switches off the display
so as to reduce power consumption, while still continuing to operate normally: the main relays remain
energised and, as soon as the voltage returns to the normal level, the display comes on again.
LED display
The controller is fitted with a very powerful and aesthetically pleasant display, with 3 digits and decimal
point, minus sign and icons to simplify the reading of the values and the operating status.
Alarm buzzer
All models are fitted with a buzzer to signal the alarms
Keypad
Keypad with 4 or 8 buttons, depending on the product, with clear indications and direct functions.
Remote control
To simplify the setting and display of the parameters, depending on the model, the instrument can be fi tted
with an infrared receiver to allow the use of the new compact remote control: this device can be used on
a series of ir33 controllers in the same room, without problems of interference. In fact, each controller is
identifi ed by a different access code.
Duty setting
This function ensures the operation of the compressor even when the control probe (room probe) is
faulty. If the probe is disconnected or short-circuited, the compressor is activated at set intervals, with a
running time (in minutes) equal to the value assigned to the duty setting parameter (parameter C4), and
a fi xed OFF time of 15 minutes.
Smart defrost
All ir33 series controllers can, as standard, manage the defrost functions in new modes with much more
effi cient algorithms for optimising the times (see the paragraph on smart defrosts).
Multifunction input
All the instruments have two digital inputs that can be used in different modes, depending on the
value set for the “digital input confi guration” parameters (parameters A4 and A5 for ir33, ir33power,
powercompact small, + parameter A9 for ir33DIN, powercompact, MasterCella). These inputs can be
used to enable/disable the defrost, to manage serious alarms that require the immediate shut-down of
the unit (e.g. high pressure) or delayed shut-down of the unit (e.g. low pressure), or alternatively can be
confi gured to read NTC probes, with parameters /3 and /4 for ir33, ir33power, powercompact small,
+ parameter /A5 for ir33DIN, powercompact, MasterCella.
Multifunction output
According to the model, the ir33 family can be provided with an additional multi-function output for
remote control of the alarm signal for controlling additional units with ON/OFF activation.
Real time clock
The wide range also includes models fi tted with built-in real time clock.
Pump down
This function ensures the compressor is stopped only when the evaporator is discharged (see the
paragraph “Pump down and low pressure”).
Condenser
One of the new characteristics offered by these controllers is the possibility to manage, via an NTC probe
input, the condensing temperature for both the alarms and control functions, using the auxiliary output
confi gured by parameters H1 and H5.
Double evaporator
Two independent evaporators can be managed, connected to the same circuit. The end of defrost
temperatures are independent and can be set by parameters dt1/dt2.
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