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By Pete Jacobs

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However, economizers show a high rate of failure in the study. Of the 215 units tested, 123 units were equipped with economizers. Of these, 30 units (24%) would not move at all, and 36 units (29%) did not respond when subjected to simulated economizer operating conditions. Short-term Overall, 63% of the monitoring revealed that an additional 13 (10%) economizers tested did not did not respond correctly over a range of operating work properly. conditions. Overall, 63% of the economizers tested did not work properly.

Direct Drive and Linkage Driven Economizer Dampers Examples of linkage driven (left) and direct drive (right) economizer dampers are shown below. Direct drive systems are inherently more reliable than linkage driven systems due to fewer moving parts and adjustments (PG&E, 2000). Selection of the changeover setpoint has a major influence on the energy savings potential of the economizer. , 2002). Single point changeover setpoints are selected on the economizer controller according to an A, B, C or D setting.

00 per system $600 PG&E, 2003 High efficiency HVAC 13 SEER $270 per ton $1,350 20% markup per DEER database * Analysis for 2000 ft2 building. 23 Small HVAC System Design Guide Integrated Design The load avoidance measures in this example reduce the size of the HVAC system and provide annual energy savings, as shown in Figure 7. Note, improving the roof insulation system had the largest effect on HVAC system size, due to reduced roof loads and duct leakage interactions. The first cost of the HVAC unit is estimated at $1,350 per installed ton.

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