Who must give written approval if it's necessary to change, modify, or alter a manufacturer's instructions?

The requirement for written approval from the manufacturer when changing, modifying, or altering their instructions is based on the need to maintain safety, compliance, and manufacturer specifications. Manufacturers design their products with specific guidelines for installation and operation to ensure optimal performance and safety standards. Any changes to these instructions could potentially lead to unsafe conditions, equipment failure, or even invalidation of warranties.

Obtaining written approval from the manufacturer serves several purposes: it ensures that the modifications comply with safety standards, protects both the contractor and the customer by having the manufacturer's endorsement on the change, and it helps maintain the integrity and reliability of the equipment. This is particularly important in industries governed by regulations and safety standards, such as oil fuel systems, where adherence to proper procedures is crucial for both legal compliance and public safety.

Other parties, such as the contractor or customer, may have roles in the process, but only the manufacturer has the authority and expertise to validate alterations to their own instructions.