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Service Manual
Ne
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lectronic Cold Platform 2005
Edition
2005.03.25
Language
E
nglish
Refrigerator Compartment Adjustment:
Refrigerator temperature control is managed by the
PCB according to the temperature measured by the
refrigerator air sensor in relation to the user settings
on the interface.
I
f the temperature measured by the
refrigerator air sensor is above the On threshold, a
cooling demand is activated thereby starting the
compressor and the refrigerator fan and opening the
damper; on the contrary, if the refrigerator air sen-
sor detects a temperature lower than the Off tem-
perature, the cooling demand is deactivated.
Special Conditions
Optimisation of power consumption: Temperature adjustment follows different rules if the following condi-
tions occur:
·
Only ECO ON
·
Temperature detected by PCB sensor (on the PCB) between two values parameterised in the EEPROM
memory.
·
Time since the last time the door was opened greater than the parameters stored in the EEPROM
memory.
·
Duration of last compressor On cycle less than a parameter stored in the EEPROM memory.
I
f these conditions are all met, with every cooling demand from the refrigerator compartment, because of
the rise in the relative temperature above the set On threshold, also the freezer compartment is forced to
transmit a cooling demand.
Cancellation of this situation can occur if at least one of the previous conditions is no longer detected, or
because the condition persists for a time greater than the relative parameter set in the EEPROM memory.
LOADS MANAG
E
M
E
NT:
Compressor Operation:
The compressor serves to compress the gas in the thermodynamic circuit in order to generate the neces-
sary cooling capacity to chill the appliance compartments.
The compressor is managed by the Main PCB with the aid of a relay and a triac that trips, in parallel with the
relay, only at the time of compressor power-on and power-off to protect the relay from electrical arcing when
the contact is opened and closed, otherwise the compressor is powered exclusively via the relay when it is
running.
The compressor is started whenever a cooling demand is received from either of the two compartments.
When both compartments no longer require cooling, the compressor will be switched off.
I
n certain conditions the compressor will remain stopped despite the presence cooling demands; these
situations are as follows:
Compressor protection
: the compressor switches on once a minimum safety time interval (parameterised
in the EEPROM) has elapsed since the last power off, thereby allowing the pressure of gas to reach a point
of equilibrium in the refrigerant circuit. The same minimum safety time is observed in the event of a mains
power interruption (voluntary or involuntary). This compressor protection strategy is observed only after the
product has been operating continuously for a number of hours defined in the memory. This facilitates the
execution of factory tests.
Summary of Contents for New electronic cold platform 2005
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