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5.5 - DANFOSS bD35/bD50F 12-24 V Dc INSTRUcTIONS
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
the minimum is 85 v AC.
The maximum ambient temperature is 55°C. The electronic unit has
incorporated thermal insulation to stop and start the compressor if the unit temperature gets
too high (100°C / 212°F on the printed circuit). Power input is limited to 100 W (see bD50F
technical data sheet for details).
Installation (fig. 5.5.1)
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. 5.5.1)
DC: The electronic control 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 circuits 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. 5.5.2 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 limit =
270 v AC, lower limit = 80 v AC. A 4 A fuse must be fitted to the live (L) cable to protect the
installation. If a main switch is used, it should be rated to a current of min. 6 A. The wire
EN
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, the 12 v DC supply system will enter into operation after a
time delay of 1 min. If the AC power supply is re-established there will be no delay in compressor
operation.
battery protection (fig. 5.5.1)
The stopping and re-starting of the compressor depend on the settings for the voltage limits
measured on the + and – terminals of the electronic control unit.
The standard settings for 12 v
and 24 v power supply systems appear in fig. 5.5.3. Other settings are optional if a connection
which includes a resistor (9) is established between terminals C and P.
Thermostat (fig. 5.5.1)
The thermostat (7) must be connected as described in chapter 10.
Fan (optional, fig. 5.5.1)
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.
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