Type III: Maintenance of low pressure equipment. Proper maintenance and disposal of low pressure appliances requires type III certification. This test is different from type II in that low pressure systems operate under vacuum. Therefore, watertightness tests and adequate pressurization are crucial components of low air conditioning services.
pressure. EPA type 3 covers low-pressure appliances. Technicians working on a Type 3 appliance must be certified as Type 3 or universal technicians. The tests for each of these types of certification cover different topics.
