自1972年以来，技术委员会1.7“耐久性、可靠性和可维护性”一直试图在供暖、通风和空调设备的可靠性/可维护性领域建立一些标准和指南。我们能够定义几个术语，这些术语现在或将出现在ASHRAE手册和产品总监第42章“操作和维护”中。然而，我们试图确定一些在维护领域可以预期的确切数字，但却遇到了挫折。我们发现，制造商和用户不一定知道或跟踪预防性维护成本、纠正性维护成本、平均维修时间（MTTR）设备，也不知道设备的平均无故障时间（MTBF）。 本文将展示一个用户组织现在是如何收集维护成本的，并有望推动其他用户组织进一步参与制定维护成本、可维护性/可靠性标准，以及制造商和业主指南。引文:ASHRAE交易，第82卷，第2部分，华盛顿州西雅图

Technical Committee 1.7, Durability, Reliability and Serviceability, has been attempting since 1972, to establish some criteria and guidelines in the reliability/maintainability area for heating, ventilating and air-conditioning equipment. We were able to define several terms which now appear or will appear in Chapter 42, Operation and Maintenance, of ASHRAE Handbook & Product Director. However, our attempts to establish some definitive numbers which can be expected in the maintenance area have met with frustration.We found that manufacturers and users do not necessarily know or keep track of things like preventive maintenance costs, corrective maintenance costs, mean time to repair (MTTR) equipment, nor mean time between failures (MTBF) of equipment. This paper will show how one user organization is now collecting maintenance costs and hopefully will be the impetus for further involvement of others in establishing maintenance costs, maintainability/reliability criteria, and guidelines for manufacturers and owners.