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I have a Zanotti Un0 80 that once the evaporator reaches…

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I have a Zanotti Un0...
I have a Zanotti Un0 80 that once the evaporator reaches 40-43 degrees it'll begin to defrost, run for a minute then stop, then run normally for a minute then it will begin defrosting again. It'll keep defrosting and the temperature won't go down past 50. The evaporator won't go down past 40.
The unit has been properly evacuated and recharged with the proper amount of refrigerant. We disconnected one of the thermostats that's bolted on the evaporator and the unit will work great and the temperature will go down to 0, but by doing that the defrost does not work nor can it be manually initiated. We already replaced that same thermostat, but it did the defrost loop once it was installed.
Thank you
Submitted: 4 months ago.Category: Medium and Heavy Trucks
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Answered in 3 days by:
12/7/2017
Technician: Jeremy, Certified Truck/Bus Technician replied 4 months ago
Jeremy
Jeremy, Certified Truck/Bus Technician
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Experience: ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician
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