Frigomatic Milano Manual v1 PAGE 16
CHAPTER 9
ELECTRICAL CONNECTIONS
9.1 - POLARITY
Use color-coded cable to avoid reverse polarity. Reverse polarity doesn’t damage the
electronic controller but will not run the compressor. The main panel switch must be new
and of good quality, with minimum power capacity of 20A (10 A for 24V supply). If you use
a circuit breaker make sure that it doesn’t cause too much voltage drop at start.
9.2 - WIRE SIZE
Measure the length the lead will have between the service control board and the electronic
controller. Lead size should be no less than 0,0005 sq.in for each foot length (1 sq.mm for
each mt length). We suggest installing a cable having a wire gauge as shown in the
following table.
DISTANCE FROM SERVICE BATTERY WIRE GAUGE WIRE SIZEWIRE SIZE
TO ELECTRONIC CONTROL BOARD
feet * mt AWG mm2 mm2
up to 6 * 2 14 2
7 to10 * 2.1 - 3 12 3
11 to17 * 3.25 - 5 10 5
18 to 27 * 5.50 - 8 8 8
28 to 42 * 8.50 - 13 6 13
43 to 64 * 13.50 - 19 4 19
9.3 - CONNECTIONS TO THE ELECTRONIC CONTROLLER
The electronic unit must be connected only to the battery through a good 15A circuit
breaker or a quick acting 15a fuse. Positive (red wire) must be connected to terminal +
and negative (black wire) at terminal -.
9.4 - WHAT SHOULDN’ T HAPPEN
Bear in mind that the voltage drop occurs across dirty and corroded connectors; never
twist wires together but only screw or solder them. A high voltage drop will prevent a
compressor starting, will cause erratic running and would also damage the condensing unit
if you don't eliminate the voltage drop very soon.
9.5 - THERMOSTAT CONNECTION AND COMPRESSOR SPEED CHOICE
These Milano is supplied with the speed regulator E51045 which allows you to set the
compressor speed from 2,000 and 3,500 RPM.
Simply connect the thermostat at C & T connections (there is no polarity) then set voltage
12V or 24V and then the desired speed using the rheostat dial.
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