Dometic CoolMatic CD30 Drawer Fridge wiring diagram

The CoolMatic CD30 is a 30 L compressor drawer refrigerator with 12/24 V DC supply. The technical table, page 14, lists 3 A at 12 V and 1.5 A at 24 V. The catalog uses the 12 V rating; it is not a claim that the compressor runs continuously or that 24 V operation draws 3 A. Cooling demand changes with ambient temperature, ventilation and drawer use.

Use the refrigerator's marked positive and negative supply connection as described on page 6. Verify polarity and keep the electrical supply separate from any improvised mains connection. The catalog terminals represent the complete refrigerator input, not the compressor motor winding or internal controller pins.

The connection instructions, page 7, specify supply protection of at least 15 A for 12 V, or 7.5 A for 24 V. These are protection requirements, not consumption or connector ratings. The same page has separate 12 V and 24 V cable cross-section curves versus battery-to-fridge distance. Follow the appropriate curve for the actual route. The page's short 12 V example uses 6 mm² conductors with 1 m per leg; it does not establish a universal maximum cable length.

Keep the ventilation route unobstructed and mount the refrigerator as instructed. The technical table states an ambient range of 16–43 °C and a cabinet adjustment range of approximately −2 to +12 °C. Avoid directing nearby equipment's waste heat into the compressor space, because poor cooling airflow changes both performance and duty cycle.

Measure voltage at the refrigerator while the compressor starts and runs, then confirm cooling and secure drawer movement. The stated low-voltage cutout/restart values are 10.4/11.7 V on a 12 V supply and 22.8/24.2 V on 24 V. A cutout can therefore indicate cable loss as well as battery condition. Inspect the fuse, terminals, return path and ventilation before treating repeated shutdown as a refrigerator fault.