Chapter 7 System Operation And Maintenance 79
Liebert.PEX Chilled Water Series Air Conditioner User Manual
7.6 Water Flow Control Valve
The water flow control valve adjusts the valve position by collecting the refrigeration requirement signal, so
as to control the water flow through the heat exchanger coil. The heavier the load is, the more water flow is
allowed to flow through the heat exchanger coil. The water flow control valve is composed of a regulator body,
connector
（
Small actuator without connectors, such as Figure 7-6 left; large actuator is equipped with
connectors, such as Figure 7-6 right and actuator.
Actuator
Regulator body
Actuator
Connector
Regulator body
Figure 7-6 Water flow control valve
Adjusting method
The water flow control valve automatically adjusts the valve position according to the refrigeration
requirement, so as to make sure the temperature and humidity of the AC room are within the control range.
When the refrigeration requirement is big, the valve would open wider and the water flow would increase.
When the refrigeration requirement is small, the valve would open narrower and the water flow would
decrease.
Test function
When there is refrigeration and dehumidification requirement, the valve would open and have water flow.
When there is no refrigeration or dehumidification requirement, the valve would close and have no water flow.
