User manual

19
ENGLISH
ir33 +030220441 - rel. 2.5 - 16.06.10
6. DESCRIPTION OF THE FUNCTIONS
6.1 Models
Below is a list of the functions relating to the various models of controller.
Function M (*) SYFCH (**) A (***) D (***)
temperature display
    
display second probe with external contact
    
temperature alarm monitoring
    
compressor control
   
defrost with compressor stop
   
defrost with heater or hot gas
  
continuous cycle
   
duty setting
   
evaporator fans
 
auxiliary output 1

auxiliary output 2

Tab. 6.a
The controllers can be  tted with a maximum of two auxiliary relays. The associated functions are:
• alarm output, normally open or closed;
• auxiliary output;
• light output;
• second evaporator output;
• control output for pump down valve;
• control output for condenser fans;
• second delayed compressor output,
• auxiliary output, with deactivation when OFF;
• light output, with deactivation when OFF;
• no function associated with the output;
• reverse output in control with dead band;
• second compressor step output;
• second compressor step output with rotation.
The controllers can be  tted with a maximum of three digital inputs (or three probe inputs).
The associated functions are:
• immediate alarm;
• delayed alarm;
• select probe displayed (model M);
• enable defrost;
• start defrost;
• door switch with compressor and fan shutdown and light management;
• remote ON/OFF;
• curtain switch with set point variation and light management;
• low pressure alarm;
• door switch with fan shutdown and light management;
• direct/reverse selection;
• light sensor and light management;
• door switch with compressor and fans o , without light management;
• door switch with fans o , without light management.
The controllers can be  tted with a maximum of  ve probes (three of which as alternatives to the digital inputs). The associated
functions are:
• ambient probe (used to calculate the virtual control probe);
• product probe (if necessary, used to calculate the virtual control probe);
• defrost probe (main or secondary evaporator, end defrost on 3 evaporator temperature probes);
• condenser probe (used, if necessary, for condenser fan control).
Other functions that enhance the range of the refrigeration controllers include:
• real time clock, for management of real time defrosts;
• real time clock for HACCP alarms management;
• real time clock for the activation/deactivation of the AUX and LIGHT outputs;
• real time clock for the automatic variation of the set point
6.2 Testing the display and keypad on start-up
When the controller is switched on, a special procedure tests the display and the keypad:
Phase Display Keypad Note
First Display completely OFF for 2 seconds Press PRG for 2 seconds to set the default
values
Second Display completely ON for 2 seconds No e ect
Third Three segments (‘---’) on Pressing each button lights up a speci c
segment
In this phase,
appears to indicate
the presence of the RTC
Fourth Normal operation Normal operation
Tab. 6.b
(*) = ir33 only
(**) = powercompact and ir33 DIN only
(***) = mastercella only