Vitrifrigo ND35H2O Manuel D'installation page 23

12/24 V DC and 100-240 V AC Control unit
The electronic unit is a multi voltage device. It can be used with 12V/24 V DC and 100-240
V AC 50/ 60Hz systems. The maximum voltage for 12V DC systems is 17 V DC, while for 24
V DC systems it is 31.5 V DC. In case of AC power, the maximum voltage is 265 V AC, while
EN
the minimum is 85 V AC. The maximum ambient temperature is 55°C. The electronic unit
has an incorporated thermal insulation to start and stop the compressor if the temperature
of the electronic unit becomes too high (100°C / 212°F on the printed circuit). Power
consumption is limited to 100 W. See the data sheet BD50F for details.
Installation (fig. 6)
Connect the terminal plug from the electronic unit to the compressor terminal. Fit the
electronic unit on the compressor by snapping the cover over the screw head (1).
Power supply (fig. 6)
DC: The electronic unit must always be connected directly to the battery poles (2). Connect
the plus to + and the minus to -, otherwise the electronic unit will not work. The electronic
unit is protected against reverse battery connection. For protection of the installation, a fuse
(3) must be fitted to the + cable as close to the battery as possible. It is recommended to
use 15 A fuses for 12 V and 7.5 A fuses for 24 V circuits. If a main switch (4) is used, it
should be rated to a current of min. 20 A. The wire dimensions in fig. 7 must be observed.
Avoid extra junctions in the power supply system to prevent voltage drops from affecting the
battery protection setting.
AC: The wires must be connected to the terminals marked L and N on the electronic unit.
Rated voltages from 100 to 240 V AC 50/60 Hz. Safety breaker: Upper safety cut-out limit
= 270 V AC and lower limit 80 V AC. A 4A fuse (11) must be fitted on the live (L) cable to
protect the installation. If a main switch (12) is used, it should be rated to a current of min.
6A. The wire dimensions must be min. 0.75 mm2 or AWG 18. NB: An earth connection can
be used if required.
General: Both the AC and the DC power supply can be connected to the electronic unit at
the same time. In this case, AC will be the preferred power supply source. If the AC power
supply is disconnected or drops below 85 V AC on a 12 V DC supply system, a time delay of 1
min. will be activated before the compressor continues on DC power supply. If the AC power
supply is re-established there will be no delay in compressor operation.
Battery protection (fig. 6)
The compressor is stopped and re-started again according to pre-established voltage limits
measured on the + and - terminals of the electronic unit. The standard settings for 12 V and
24 V power supply systems appear in fig. 8. Other settings are optional if a connection which
includes a resistor (9) is established between terminals C and P.
Thermostat (fig. 6)
The thermostat (7) is connected between the terminals C and T. Without any resistor in the
control circuit, the compressor will run with a fixed speed of 2,000 rpm when the thermostat
is switched on. Other fixed compressor speeds in the range between 2,000 and 3,500 rpm
can be obtained when a resistor (8) is installed to adjust the current (mA) of the control
circuit. Resistor values for various motor speeds appear in fig. 10.
Fan (optional, fig. 6)
A fan (5) can be connected between the terminals + and F. Connect the plus to + and the
minus to F. Since the output voltage between the terminals + and F is always regulated to
12 V, a 12 V fan must be used for both 12 V and 24 V power supply systems. The fan
output can supply a continuous current of 0.5 Aavg. A higher current draw is allowed for 2
seconds during start.
Lamp (optional, fig. 6)
A 12 V DC 5 Watt lamp (10) can be connected between the terminals A and C. The output
voltage between the terminals A and C is always regulated to 12 V DC. A 12 V DC lamp can
be used with both the 12 V and 24 V power supply. The lamp output is a continuous output
current of 0.5 A on average.
LED (optional, fig. 6)
A 10mA light emitting diode (LED) (6) can be connected between the terminals + and D. If
the electronic unit records an operational error, the diode will flash a number of times. The
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