What document must be provided when altering manufacturer's installation instructions?

When altering manufacturer's installation instructions, it is essential to provide a written approval. This requirement is in place to ensure that any changes made to the original instructions are documented and formally acknowledged by the manufacturer. Written approval serves as a legal record that verifies the alterations have been authorized, mitigating potential disputes or issues that may arise from modifications. This documentation also ensures safety and compliance with relevant regulations, which can be crucial for both the installer and the end-user of the equipment.

A verbal agreement lacks the formality and clarity that written approval provides. A waiver form does not typically apply in this context, as it generally pertains to relinquishing rights or claims rather than approving changes. Similarly, a compliance certificate is a document confirming adherence to regulatory standards, but it does not serve as a method to approve alterations to installation instructions. Therefore, the necessity of obtaining a written approval ensures that all parties involved are protected and informed regarding the changes made to the installation process.