PENGUIN REFRIGERATION LTD
Unit 2b
Alexandria Park
Penner Road
Havant
Hants
PO9 1QY
T: 02392 453293 F: 02392 453293 E: [email protected]
Page 2
Suppliers of
Registered in England No: 4310267 VAT No: GB 785 5650 85
a) Confirm the wire dimension is correct
If this is a new installation check the wire sizing:
Electrical Cables Table
Size
Max Distance
12V
24V
mm
2
Awg
M
ft
M
ft
2.5
14
2.5
8.2
5
16.4
4
12
4
13.1
8
26.2
6
10
6
19.6
12
39.4
10
8
10
32.8
20
65.6
b) Test the Power supply
To properly test the power supply to a Danfoss powered 12v or 24v system, the
following testing procedure must be carried out. This will establish whether the
power supply feeding the system is free of bad, loose and/or high-resistance
connections.
Reading the voltage on the panel or at the batteries is meaningless, as is the fact
of a new installation or new batteries.
Size and the capacity of the battery bank is irrelevant.
1.
Turn off the breaker (or remove the fuse) supplying DC power to the system.
2.
Unplug one of the thermostat leads at the controller.
3.
Using a multi-meter, read the DC voltage at the battery terminal(s).
4.
Connect the multi-meter reading DC voltage to the power terminals (+ and -)
on the controller so that it can be left connected and monitored.
5.
Turn on the breaker (or install the fuse) to the system.
6.
Check that the voltage is the same as the voltage seen at the battery
terminals.
7.
Whilst watching the multi-meter, reconnect the thermostat lead and monitor
the voltage continuously before, during, and after the compressor starts or
attempts to start.
Interpreting power supply results
If the power supply is free of loose, bad, and/or high resistance connections,
the voltage reading at 5 above will stay very stable and only drop slightly
when the compressor starts. As a general rule, on a 12v system the reading
should not drop below 12v.
