User manual

7
Fig. 1.b - ir33DIN
Fig. 1.c - powercompact - powercompact small
Fig. 1.a - ir33, ir33 power
Fig. 1.d - MasterCella
ENGLISH
ir33 +030220441 - rel. 2.5 - 16.06.10
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 signi 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), 115 Vac, 230 Vac or 11 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 o 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  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 identi ed by a di erent 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 discon-
nected 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  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 e 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 di erent modes, depending on the value set for the “digital input
con guration” parameters (parameters A4 and A5 for ir33, ir33power, powercompact, 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 alterna-
tively can be con gured to read NTC probes, with parameters /3 and /4 for ir33, ir33power, powercompact, 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 so as to manage a second compressor, a second evaporator, the
condenser fans, and so on.
Real time clock
The wide range also includes models  tted with built-in real time clock.
Pump down
This function ensures the compressor is stopped only when the evaporator is discharged (see paragraph 6.8 “Pump down and low
pressure”).
Condenser
One of the new characteristics o ered 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 con 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.