调节离开热水或冷却水盘管的空气温度的控制器的节流范围是在ENZERO和满容量之间操作水阀所需的空气温度变化。节流范围是控制器的正常特性，与控制器的“增益”成反比。在同时进行加热和冷却的空调系统中，由于节流范围，加热和冷却都需要额外的能量。在节流范围惩罚最严重的运行模式下（部分负载运行），加热和冷却所需的能量可以减少约10%，例如，通过将节流范围从6°C减小到2°C。在大多数商用控制器上减小节流范围的过程是一个简单的现场调整。 引文:阿什雷学报，第84卷，第一部分，佐治亚州亚特兰大

The throttling range of a controller that regulates the air temperature leaving a hot orchilled water coil is the change in air temperature needed to operate the water valve betweenzero and full capacity. The throttling range is a normal characteristic of controllers and isinversely proportional to the "gain" of the controller. In those types of air-conditioningsystems experiencing simultaneous heating and cooling, extra energy is required for both heatingand cooling because of the throttling range. During operating modes when the penalty ofthe throttling range is most severe (part-load operation), the energy required for both heatingand cooling could be reduced by approximately 10 percent, for example, by reducing the throttlingrange from 6°C to 2°C. The process of reducing the throttling range on most commercialcontrollers is a simple field adjustment.