The lowest cost method to reduce utility bills is almost always to improve the operation of existing equipment. After the first five years nearly all HVAC systems slip in efficiency, resulting in the need to measure and analyze performance, and then to make necessary adjustments and retrofits. This manual is designed to provide guidelines for engineers and technicians for correctly interpreting their readings of field measurements in order to accurately pinpoint system deficiencies, and then to perscribe the most effective strategies for correction. It is a frequent scenerio that properly evaluated feild test results lead to the conclusion that purchase of new equipment is not necessary and not the most economical solution in terms of payback. This manual goes beyond the information presented in the usual manufactuere's operation and maintenance manual, showing you solutions for making parts of different makes work effectively together. Case studies are presented to illustrate both the concepts presented and the actual savings achieved. A variety of useful test data sheet are also included.
