Lofty60
New Member
Isotherm ASU fridge. Type 5702, anyone know where to get electronic control unit, have tried but it’s to old and not available, Anyone any ideas, have pictures!!!!!
Isotherm ASU fridge
- Thread starter Lofty60
- Start date
pvb
Well-Known Member
I can't see why a more modern control unit shouldn't work; the Danfoss compressor has been used for ages. Why not email Indel and ask them?
https://www.indelwebastomarine.com/int/contact-dealer-list/
https://www.indelwebastomarine.com/int/contact-dealer-list/
john_q
Well-Known Member
I have been running my water cooled Isotherm ASU fridge without the Blue Electronics unit fine for about 4 years, It only runs at low speed and uses about 3 amp. you will need to fit a new thermostat which are cheap enough
Lofty60
New Member
Thanks John, ours is before the blue, it’s just one box with power transistors, and voltage converters, and there is no out put . I can see putting a thermostat in to switch the compressor, bypassing the control box.
How did you get The 5 volts to power the water pump,
How did you get The 5 volts to power the water pump,
john_q
Well-Known Member
Extract from an Isotherm document on how to test the Danfoss electronic unit
When you remove the Isotherm ASU unit you will find the Danfoss electronic unit underneath.
To test the Danfoss electronic unit
Move the battery power cables from the ASU unit to the (BIG) +ve and -ve on the black Electronic unit, the two upper tabs.
Then also move over the fan cables (air cooled units) to the black unit,
+ red to the small + and the black – to F.
NOTE
If you are water cooled, attach the connections +ve & -ve connections described above to your the existing Voltage reducer which will then run the water pump at reduced voltage
Bridge C and T with a separate cable made for the test
If the compressor runs, the black Danfoss electronic unit is OK. If not, it has to be replaced.
If the Danfoss electronic unit is OK, buy a thermistor and attach it to the C & T terminals and off you go, the compress will only run at low speed but there are solutions to this involving resistors if required on the internet
Hope this helps
This wiring solution is used on the non ASU Isotherm units but I cannot find the relevant manual
When you remove the Isotherm ASU unit you will find the Danfoss electronic unit underneath.
To test the Danfoss electronic unit
Move the battery power cables from the ASU unit to the (BIG) +ve and -ve on the black Electronic unit, the two upper tabs.
Then also move over the fan cables (air cooled units) to the black unit,
+ red to the small + and the black – to F.
NOTE
If you are water cooled, attach the connections +ve & -ve connections described above to your the existing Voltage reducer which will then run the water pump at reduced voltage
Bridge C and T with a separate cable made for the test
If the compressor runs, the black Danfoss electronic unit is OK. If not, it has to be replaced.
If the Danfoss electronic unit is OK, buy a thermistor and attach it to the C & T terminals and off you go, the compress will only run at low speed but there are solutions to this involving resistors if required on the internet
Hope this helps
This wiring solution is used on the non ASU Isotherm units but I cannot find the relevant manual
