Isotherm ASU systems are designed for installations in existing cool boxes and mainly for use in sailing yachts where battery power is at a premium. The ASU system dramatically reduces power consumption while supplying refrigeration in abundance. It senses when surplus power is available from the engine alternator and speeds up the compressor to rapidly freeze the holding plate. When surplus power is no longer available it reduces its energy-use accordingly. The stainless-steel holding plate can be fitted at any suitable angel high up in the box before being connected to the compressor unit by the three meter long six mm diameter flexible copper piping fitted with quick-couplings. The compressor unit is small enough to be fitted in a stowage within connecting distance from the holding plate. Extremely quiet when running, it can even be fitted under a bunk if needed. After connecting the leads to the battery, the pre-filled system is ready to go.

Product name	Max box volume, fridge	Dimensions compressor LxWxH mm	Weight (kg)	Power consumption Avg/Max (12V)	Danfoss compressor type	Temperature range
ASU 3201	125	160x270x155 mm	14	0.4/5.0 A	BD35F	Fridge
ASU 3251	125	135x210x155 mm	15	0.35/4.8 A	BD35F	Fridge
ASU 3701	200	160x315x155 mm	16	0.65/6.2 A	BD50F	Fridge
ASU 3751	200	135x210x155 mm	17	0.55/6.0 A	BD50F	Fridge
ASU 4201	200	200x390x175 mm	19	0.9/7.1 A	BD50F	Fridge
ASU 4701	240	200x390x175 mm	23	1.0/7.1 A	BD50F	Fridge
ASU 4901	400	220x440x175 mm	32	1,6/10,5 A	BD80F	Fridge
ASU 5301	260	225x475x175 mm	27	1.3/10.3 A	BD50Fx2	Fridge
ASU 5801	325	225x475x175 mm	30	1.4/10.3 A	BD50Fx2	Fridge