Vitrifrigo ND35H2O Manuel D'installation page 21

Power supply (fig. 1)
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. 2 must be observed. Avoid extra junctions in the power supply system to prevent
voltage drops from affecting the battery protection setting.
Battery protection (fig. 1)
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. 3. Other settings (fig. 4) are
optional if a connection which includes a resistor (9) is established between terminals
C and P. In solar applications without a battery a 220 kW resistor is recommended. In
AEO (Adaptive Energy Optimizing) speed mode the BD compressor will always adapt
its speed to the actual cooling demand within a random operation voltage of 9.6 to
31.5 V.
Thermostat (fig. 1)
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. With the thermostat directly connected to terminal C the
electronic unit 101N0300 will adjust its speed to the actual cooling demand. 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. 5.
Fan (optional, fig. 1)
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.
LED (optional, fig. 1)
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 number of flashes depends on what kind of operational error was recorded.
Each flash will last ¼ second. After the actual number of flashes there will be a delay
with no flashes, so that the sequence for each error recording is repeated every 4
seconds.
No. Error type
flashes
5 Electronic unit thermal stop. If the cooling system has been overloaded or
the ambient temperature is too high, the control unit will overheat.
4 Insufficient motor speed. If the cooling system is overloaded, the motor is
no longer able to maintain a minimum speed of 1,850 rpm
3 Motor start error. The motor is blocked or the differential pressure of the
cooling system is too high (> 5bar).
2 Fan stop due to overcurrent. The fan is drawing more than 1 A from the
electronic control unit
1 Battery protection stop. The power voltage is outside the set disconnect
value.
pp
EN
21