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VI. a INFORMATION MENU (cont'd)
Selection of Second Parameter Group:
It's possible to select control parameters between
two different pre-programmed groups, in order for the
fundamental control parameters to be adapted quickly to
changing needs. Changeover from Group I to Group II (and
vice versa) may take place MANUALLY by pressing button
for 2 seconds (with IISM = MAN), or AUTOMATICALLY when
ECO conditions are detected (with ISM = ECO), or when
IISM = DI, DxO = IISM and the digital input is activated (the
activation of DIx selects Group II, x = 1,2,3). If IISM = NON,
switchover to Group II is inhibited. The activation of Group
II is signaled by the lighting up of the relevant LED on the
controller display.
VI. b - ADJUSTING CABINET SETPOINT
Setpoint display and modification:
• Press button
for atleast a half second to display the
setpoint value.
• While keeping the
button pressed, use button
or
to set the desired value (adjustment is within
the minimum SPL and the maximum SPH limit).
• When button
is released, the new value is stored.
VI. c - INITIATING A DEFROST
Automatic defrost:
Defrost starts automatically as soon as the time set with
parameter DFT has elapsed.
• Timed defrost: With DFM = TIM defrosts take place at
regular intervals when the timer reaches the value of
DFT. For example, with DFM = TIM and DFT = 06, a
defrost will take place every 6 hours.
• Optimized defrost: With DFM = FRO the timer is only
increased when the conditions occur for frost to form
on the evaporator, until the time set with parameter
DFT is matched. If the evaporator works at 0°C, defrost
frequency depends on the thermal load and climatic
conditions. With setpoints much lower than 0°C, defrost
frequency mainly depends on the refrigerator operating
time.
• Synchronized defrost: With D3O = DSY and when more
units are linked to each other, synchronized defrosts of
all linked controllers will take place. The first controller
which will start defrost, will also get all other controllers
synchronized.
• Defrost time count backup: At the power-up, if DFB =
YES, the defrost timer resumes the time count from
where it was left off before the power interruption. Vice
versa, with DFB = NO, the time count re-starts from 0.
In stand-by, the accumulated time count is frozen.
VI. CONTROL BASICS
VI. c - INITIATING A DEFROST (cont'd)
Manual or remote defrost start:
It's possible to manually start a defrost, by pressing button
for 2 seconds.
Defrost type:
Once defrost has started, Compressor and Defrost outputs
are controlled according to parameter DTY. If FID = YES,
the evaporator fans are active during defrost.
Defrost termination:
The actual defrost duration is influenced by a series of
parameters.
• Time termination: T2 = NO and T3 different from 2EU:
the evaporator temperature is not monitored and defrost
will last as long as time DTO.
• Temperature monitoring of one evaporator: T2 = YES
and T3 different from 2EU. In this case, if the sensor
T2 measures the temperature DLI before the time DTO
elapses, defrost will be terminated in advance.
• Temperature monitoring of two evaporators: T2 = YES,
T3 = 2EU, AOx = 2EU. This function is for the control
of two independent evaporators and it switches off
the individual heating of the evaporator which gets to
temperature DLI first, waiting for the second evaporator
to get to that temperature before the time DTO elapses.
Resuming thermostatic cycle:
When defrost is over, if DRN is greater than 0, all outputs
will remain off for DRN minutes, in order for the ice to melt
completely and the resulting water to drain. Moreover, if
probe T2 is active (T2 = YES), the fans will re-start when
the evaporator gets to a temperature lower than FDD; Vice
versa, if probe T2 is not active (T2 = NO) or after defrost
has come to an end, such condition does not occur by end
of the time FTO, after FTO minutes have elapsed the fans
will be switched on anyway.
Caution: if DFM = NON or C-H = HEA all defrost functions
are inhibited; if DFT = 0, automatic defrost functions are
excluded.
-6-
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