Appendix III, continued
98
Using a Decoder With a Normally Closed (NC) Master Valve
In this installation, a decoder controls a Normally closed master valve with a pressure switch controlling the
operation of the pump. Please see the illustration below. When setting up the controller, enter the decoder
Address. If the master valve is Normally open, please see Using the Municipal Water Supply With a Master Valve
(NC or NO) on page 100.
With the above setup, both the master valve and flow sensor monitor the flow rate. Once the flow exceeds the
maximum rate, the controller sends a signal to the pump decoder shutting off the master valve and all other
decoders and valves in the system. When the water pressure builds up inside the pump, due to the pressure
switch, the pump also stops. There cannot be a leak in the system because when no Programs or decoders are
active, the Normally closed master valve is closed.
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