m - Isobar

1. FRONT PANEL COMMANDS
SET : By pressing and releasing the set key, the SET is displayed, which can be immediately changed by the and keys.
In order to exit wait the time-out or press the set key again.
UP : In the programming mode it browses the parameter codes or increases the value of the variable displayed.
Keep pressed for a faster increase.
Manual defrost: By holding it pressed for 5 seconds, a defrost cycle starts.
DOWN : In programming mode it browses the parameter codes or decreases the value of the variable displayed. Keep pressed
for a faster decrease.
PRG : By instrument ON pressing the PRG key for some seconds (hidden key, placed between the display and the lightened
leds) the User parameter programming is entered. During the programming, by pressing again the key for some
seconds, the menu of the hidden parameters (Pr2) is entered, which is protected by a password. The programming exit
occurs due to time-out or by pressing PRG again when a parameter is displayed. As concerns the programming of the
hidden parameters, in order to change the parameter accessibility, press the PRG key for some seconds. If a parameter
is present only in the Pr2 menu, its code blinks.
ON/OFF : Sbd parameter=0: Connect and disconnect the device.
Sbd>0 parameter: By instrument OFF, pressing the ON/OFF key the unit enters the preheating mode (STAN-BY). During
this mode, pressing the ON-OFF key for 3 seconds, the unit starts and the regulation begins.
By instrument ON, pressing the ON-OFF key and the unit will stall.
LIGHT : Pressing the LIGHT key, the light is switched on or off.
KEY COMBINATIONS
+ Press both keys at the same time to see the probes and digital output values:
Display sequence: Pb1: Value of the probe 1Pb2: Value of the probe 2Pb3: Value of the probe 3Estate of digital input 1 (open or closed), etc.
FUNCTIONS OF LEDS
On the keyboard there is a series of lightening leds, which monitor the loads controlled by the instrument. Each LED function is described
in the following table:
LED MODE FUNCTION
2. LOAD CONTROL
COMPRESSOR
ON The alarm is activated
BLINKING The alarm is activated but it has been silenced
ON The fans run
BLINKING During fan delay
ON The compressor works
BLINKING The counting of the compressor protection time is in progress
ON Heating mode on
BLINKING Defrosting or drain process on
ON Enabled when the instrument is ON
BLINKING When the instrument is in preheating mode
ON LIGHT selection
ON The Set point is displayed
BLINKING During parameters programming
The compressor can be controlled in 2 ways: through probe (parameter Lrr=Prb) or through digital input (parameter Lrr=di).
CONTROL THROUGH PROBE (Lrr=Prb)
The control depends on the temperature measured by the thermostat probe with positive differential compared to the set point: if the tem-
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