Wiring and Connections
GLT80TDC must always be powered through
the dedicated electronic driver FDC3, which
is supplied with the compressor as a separate
device.
NEVER CONNECT THE COMPRESSOR HERMETIC
PINS (FUSITE) TO THE TERMINALS OF A BATTERY
OR ANY OTHER DC OR AC SOURCE DIRECTLY.
DO NOT TRY TO FIT AN ELECTRONIC DRIVER
OTHER THAN THE FDC3. THE COMPRESSOR WILL
NOT OPERATE AND IRREVERSIBLE DAMAGE MAY
OCCUR.
The FDC3 driver is directly connected to the
battery poles as well as to the compressor pins.
It checks battery voltage and adjusts itself to the
voltage value for proper compressor operation,
or switches itself off if the battery voltage is not
adequate. The driver also controls the compressor
speed.
ALWAYS RESPECT THE POLARITY OF THE BATTERY
WITH THE POWER INPUT TERMINALS OF THE
ELECTRONIC DRIVER
The unit is protected against damage caused by
wrong polarity of the supply. The compressor will
not run correctly if it’s wrongly connected.
“-“ NEGATIVE POWER INPUT TERMINAL OF THE
ELECTRONIC DRIVER SHOULD BE EARTHED, TO
THE CHASSIS OF THE VEHICLE AS WELL AS THE
APPLIANCE FRAME*
A FUSE MUST BE PLACED BETWEEN THE “+” POLE
OF THE BATTERY OR DC POWER SUPPLY AND THE
“+” POWER INPUT TERMINAL OF THE ELECTRONIC
DRIVER*
12V SYSTEMS: 30A FUSE
24V SYSTEMS: 30A FUSE
42V SYSTEMS: 20A FUSE
* In some special vehicles chassis is connected to
“+” terminal of the battery instead of “-“ terminal
(positive reference systems). In such cases “+”
should be understood as “-“ and vice-versa. In
systems powered by a variable DC source, the
fuse should be selected following the rules above
mentioned, considering the maximum voltage at
the variable DC Source.
General rules
Voltage drop in the
power leads
To avoid excessive voltage drop in the leads, their
length and cross section must be related to the
voltage supply as indicated in Table 1.
Table 1: Maximum length
of leads (m)
Cross section
mm2
Rated Operating Range
12 - 14 V
24 - 28 V
36 - 42 V
4
2.5
2.5
3
6
4
4
6
10
6
6
9
If any kind of connector or switch is placed
between the battery poles and the power
terminals of the electronic driver, its resistance
should be less than 10mΩ. If the resistance is
higher than 5mΩ, the maximum length of the
wires indicated in Table 1 should be halved or the
cross section doubled.
In case of using a long cable to connect battery
and electronic driver, it is recommended using a
cable with low inductance.
6
FRCC.PC.041.A1.02
