Application guidelines
Danfoss Light Commercial
Refrigeration Compressors
GLT80TDC
Direct Current, 24-42V, Mobile Applications
http://cc.danfoss.com
Content
About the product ................................................................................................................4
Installation and application ................................................................................................ 5
Wiring and Connections ......................................................................................................6
The serial port interface ...................................................................................................... 8
Operating voltage ................................................................................................................ 9
Battery protection system ................................................................................................10
Setting up the speed .......................................................................................................... 12
Programming the electronic driver .................................................................................. 13
Protections and alarms ...................................................................................................... 14
Compressor cooling ........................................................................................................... 14
Technical Data ....................................................................................................................15
Supply .................................................................................................................................17
3FRCC.PC.041.A1.02
About the product
Many vehicles for transportation of goods or
recreation, such as trucks, caravans, boats, cars,
etc. are often equipped with cooling appliances
and air conditioners. The compressors for
such mobile applications must be designed to
operate from a low voltage DC power supply.
These compressors must also be compact in
their dimensions, highly reliable and yield high
performances.
GLT80TDC is an answer to the needs of users
requiring comfort and reliability in their
travelling, either on holidays, at work or in any
other circumstance where a DC powered air
conditioner is utilised. The GLT80TDC is designed
to operate silently, eciently and reliably even
up to angles of tilt of 20º, and works with the
environmentally friendly refrigerant R134a. Its
design is based on the “L” series, which has been
successfully present in the market since 1964,
and has had sales of more than 200 million units.
GLT80TDC is designed for capillary tube
expansion and can be powered at 24 and 42V
DC, and also at 12V with some restriction. Each
unit is supplied with a dedicated electronic driver
(FDC3), which features all the protections for
both the battery and the driver itself, including
the compressor motor. The driver automatically
adjusts itself to the voltage of the power supply.
Evaporating temperature range: -25ºC to +10ºC.
Condensing temperature range: up to 65ºC. Pulldown peak: 70ºC.
Ambient temperature range: -10 to 55ºC (65ºC at
starting).
In case of ambient temperature lower than 0ºC,
an oil heater will be needed.
The electronic control unit FDC3 is supplied with
the exclusive Serial Port Interface (SPI), featuring
a RJ45 telephone type connector. SPI allows the
electronic driver to be connected to a computer
for programming purposes using the FxC
programming package (hardware and software,
provided by the manufacturer upon request),
and allows the communication with an Electronic
Integral Manager of the appliance (EIM), and
making the compressor work in slave mode.
FDC3 electronic driver includes Smart Speed® as
programming option, which is a plug-in system
for automatically self adapting compressor
speed to current thermal load in refrigerating
appliances.
Smart Speed® reduces number of thermostat
cycles by minimizing compressor speed,
enlarging on-time at every thermostat cycle,
so that start/stop energy loses are substantially
reduced. Lowest speed yields also highest
evaporating temperature, and so highest C.O.P.
and lowest energy consumption. Pull-down is
done at maximum programmed speed, so pulldown time is very short with respect to xed
speed systems. No design parameters neither of
the compressor nor the appliance are required to
be programmed, so Smart Speed® can be easily
used in all appliances with no design eorts.
FDC3 electronic driver includes Sleep and Sleep
Energy Saving as programming option, which are
plug-in systems specially conceived for mobile
air conditioners avoiding any other electronic
device. Sleep and Sleep Energy Saving make the
air conditioner work for four hours since startup. Sleep Energy Saving makes the compressor
run at maximum programmed speed during
the rst hour, when highest cooling capacity is
needed, and lowers progressively the compressor
speed up to minimum velocity three hours
later. Maximum comfort and minimum energy
consumption are thus achieved.
GLT80TDC starting capability is as low as 10 V
under any balanced pressure; it also admits a
certain remaining dierential pressure when
thermostat o-time is abnormally short. For
improving even more the starting capability,
FDC3 electronic driver can be programmed with
a 3 minutes minimum thermostat o-time. The
delay is a programming option which can be
easily enabled by means of the FxC programming
kit.
FDC3 also includes a 1 second lter at the
thermostat input to prevent the appliance from
wrong operation due to typical micro switching
produced by vibrations in those appliances that
t tilt switches at the thermostat circuit. So,
analogical ltering is not needed.
4 FRCC.PC.041.A1.02
Installation and application
Maximum tilt angle
Fig 1. Maximum tilt angle
The maximum tilt angle allowed in GLT80TDC
compressor (stopped or running) in any of the
2 below mentioned recommended positions
is 20º, and maximum tilt angle in the 2 below
not recommended position is 15º. Apart
from this specication, below diagrams show
the recommended and not recommended
positions while the compressor is running in the
application.
RECOMMENDED POSITIONS
If compressor has been stopped during a certain
period of time with an inclination higher than
15º, it is strongly recommended to not start
up the compressor immediately after coming
back to the correct position. We recommend
waiting at least 30 minutes before starting up the
compressor.
β max=20º
O-road applications
NOT RECOMMENDED POSITIONS
GLT80TDC compressor is not designed for oroad mobile applications. If you are interested
α max=15º
in this type of mobile applications, it has to be
specically approved by the manufacturer.
5FRCC.PC.041.A1.02
Wiring and Connections
General rules
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 o 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.
Voltage drop in the
power leads
Table 1: Maximum length
of leads (m)
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.
Cross section
mm2
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.
12 - 14 V 24 - 28 V 36 - 42 V
Rated Operating Range
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
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