AWG
Max cable length
in ft 12 volt
Max cable length
in ft 24 volt
12
8
16
10
19
38
The wire dimensions are valid for each compressor.
4.4 Cable area selection chart
5 Technical data
Voltage:
DC type 12/24 VDC
AC/DC type 100-240VAC - 12/24VDC
Current consumption:
~ 10 A on 12V (when the compressors are running)
Average current consumption:
4.6 - 8.0 A on 12V (depending on ambient temperature 70 - 95°F)
Current consumption in ”off”-pos.: 14 mA on 12 V
Humidity:
Max 90%
Ambient temperature:
Max 110°F
Compressor:
Danfoss BD50F
Refrigerant:
R134a (fi lled amount written on type sticker inside the fridge compartment)
Fuse:
12 volt - 15 A, 24 volt - 7.5 A for each compressor
Battery protection:
Cut-out at 9.6 volt (21.3), cut-in at 10.9 volt (22.7)
Isotherm refrigerators and freezers fulfi lls EMC directives, CE-marked
Fault
Possible cause
Action
Fridge not cold.
Compressor will not start.
No power supply.
Battery in poor condition.
Faulty thermostat.
Faulty electronic unit.
Check that power is present at terminal box. check fuse.
Internal light works?
Check all terminal connections and cables.
Inspect battery charging system.
Check thermostat. Bridge T-C, if compressor starts, thermo-
stat is faulty, replace. If compressor does not start, probably
electronic unit is faulty.
Exchange electronic unit.
Compressor makes only short start
attempts.
Bad power supply, too low voltage or a volt-
age drop at start attempts.
Discharged batteries.
Check cables and connections, possible corrosion, clean.
Charge batteries, run the engine or connect battery charger.
Voltage shall be above 11.0 volt at start attempts.
Compressor runs but no refrigera-
tion generated.
Loss of refrigerant. Leakage in pipes or
evaporator.
Pipes blocked.
Mount service nipple on the compressor (refrigerators). Leak
test, repair possible leak, evacuate and re-fi ll refrigerant.
(All this to be made by refrigeration specialist)
Compressor runs long time but not
generating enough cold.
Bad ventilation. Condenser too warm.
Fan not working.
To much frost on evaporator.
Door not closing well.
Condenser blocked by dust.
Improve ventilation for compressor.
Replace fan.
Defrost.
Check door position and door seal.
Clean condenser.
Fuse blows.
Wrong fuse size.
Faulty electronic unit.
Check fuse 15A/12V or 7.5A-24V.
Replace electronic.
6 Fault fi nding chart
4.5 Inner light
The refrigerator compartment has inner light mounted in the top
of the cabinet.
Be sure the right type of bulb, 12 or 24 volt, is mounted before
the refrigerator is powered. Both 12 and 24 volt bulb are included
in the delivery. Max 3W bulb is to be used.
When replacing the bulb, push the light glass assembly down-
wards with the on-off push pin. Replace the bulb and push back
the light assembly into the plastic housing.
See fi g. 3 and 4.
4
