Patent ID: 8424550

Claim:
A method for operating a fluid drainage control system to drain a fluid from a fluid dispensation system comprising: determining a first ambient air temperature; determining if the first ambient air temperature is less than a predetermined drain set point temperature; isolating the fluid dispensation system from a fluid supply source by closing a supply valve located inside a temperature controlled area in response to the first ambient air temperature being less than the predetermined drain set point temperature; draining the fluid from the fluid dispensation system by opening a plurality of drain valves subsequent to closing the supply valve, wherein at least one valve of the plurality of drain valves corresponds to each of a plurality of sections of the fluid dispensation system, wherein each of the plurality of sections is located at a different elevation; determining a second ambient air temperature; determining if the second ambient air temperature is greater than a predetermined operation set point temperature; closing the drain valve in response to the second ambient air temperature being greater than the predetermined operation set point temperature; and opening the supply valve subsequent to closing the plurality of drain valves.