Frigomatic Milano Manual v1 PAGE 11
CHAPTER 5
ELECTRONIC CONTROLLER FOR FRIGOMATIC MILANO
5.1 - The electronic controller can operate from either 12V or 24V D.C
a) It automatically selects 12V or 24V supply (it chooses 24V automatically if the voltage
exceeds 17V)
b) It also allows the compressor to run at 4 different speeds according to the capacity of
the fridge or freezer and corresponding size of the evaporator plate.2,000 RPM up to
3,500 RPM set by the Speed regulator board fitted to the bottom three terminals of the
controller.
(see wiring diagram for details)
The electronic controller has also the following safety features:
5.1.1.-Protection of the battery:
if the supply voltage drops below 10.6 V (23.4) it stops the compressor till the voltage rises
back to 11.7 V (24 V). See note 2.
5.1.2 - Protection of the compressor: It stops the compressor, any time it doesn't start
when powered; it trys again every 60 seconds. - It will also stop the compressor if its
speed is too low (below 1,900 RPM).
5.1.3.- Fan motor and pump protection: if they draw more than 0.7 A, the compressor will
be stopped. It tries again every 60 seconds.
5.1.4 - Protection against too high voltage
The electronic controller, if the voltage exceeds 17V, assumes that it is connected to a 24V
environment but, in this case (between 17 and 23V) the voltage is too low and the
compressor will not run. For this reason with this model of electronic controller (marked as
BD 35F ) it must be used a stabilized mains adaptor E51305 which gives always 24V even
if the battery supplies 12V.
NOTICE 1: After the electronic unit is powered you could have a waiting time up to 30
seconds, before the compressor starts.
NOTICE 2: The electronic controller, even if designed for marine installation, must be
protected against drops of water and from the bilge splashing. Take care that
even a single water drop can follow a wire and reach the controller. For this
reason we suggest that wires are reaching the controller from a lower position.
5.2 - ALARM SIGNALS
To the electronic controller it is possible to connect a LED (terminals + and D) which emits
up to 5 blinks every 5 seconds with the following meanings:
1 blink: Supply too low (below 10.4 or 22.8) Check wire size (12.2)
2 blinks: Fan (terminals C and F) draws too much (more than .7 A)
3 blinks: Compressor failed start attempt (retries every 60 s.)
4 blinks: Compressor too low RPM (below 1,900 RPM).
5 blinks: Too high temperature of the electronic controller (heat sink) It restarts
when it cools down.
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