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Portable Units - Special Considerations
Since Portable units can be used in a variety of applications, and connected to a variety of
power sources, the following must be considered:
• Cigarette lighters may not provide sufficient voltage and power to start and
operate a portable unit. The unit may need to be wired separately from the lighter
receptacle.
• Many DC outlets in vehicles (i.e. cigarette lighters, power outlets, etc.), are not
powered when the ignition switch is turned to “Off”. Check available outlets for this
condition before leaving the unit unattended.
• Some DC outlets or receptacles remain powered when the ignition switch is
turned OFF, but do not have enough voltage to restart the compressor when
required. Check for this condition before leaving the unit unattended.
• Power outlets or receptacles that are connected directly to the battery, and have a
higher amp fused circuit (40 amps vs. 15-20 amps) will generally restart the
compressor with the ignition switch turned OFF.
Caution must be taken when the unit is left unattended under these
circumstances, as the battery will continue to drain down as the
compressor cycles and runs. This can cause the battery voltage to
drop too low to restart the vehicle’s engine. The cut-out voltage
that protects the compressor is 10.4 volts. Therefore, if the unit is
to be operated for long periods of time without replenishing the
battery, another power source may need to be provided or the unit
should be shut off, and the contents removed.
• Ambient conditions, wire sizes and battery quality can affect operation.
DANFOSS Compressor Data
Voltage Range
12V systems: From 10.4V to 17V
24V systems: From 22.8V to 31.5V
The electronic unit will calibrate automatically to the applied voltage. This means that if the
battery voltage is less than 17V, the electronic unit assumes that it is working in a 12V
system. If the voltage is higher than 17V, the electronic unit assumes that it is working in a
24V system. Consequently, the compressor does not run at power supply voltages between
17V and the desired battery protection cut-out voltage of 22.8V, for 24V systems.
Protection Systems
The Danfoss compressor protection system facilitates protection against compressor
overload and start failure, fan overload and electronic unit overheating as well as destruc-
tive battery discharge. When an overload protection is activated, the compressor enters a
cycle in which it makes start attempts at approximately 60 second intervals until a success-
ful start is achieved.