Munro Complete PRO II CP150B220AYFT Installation Manual

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HOW ON DEMAND CONTROLS WORK
On Demand Controls are used to start the pump in response to system demand, without the need for a
signal from an external device like an irrigation controller.
Any drop in the line pressure is detected by a pressure switch which activates the pump. When the system
pressure rebuilds and is high enough to cut-out the pressure switch, a flow switch takes over monitoring the
system. If flow is present, the pump will continue to run. When flow stops, a time delay is activated to reduce
short-cycling of the pump. After the delay times out, the pump shuts down.
If a line leak drops the pressure low enough, the pump will come on for the amount of time set on the time delay;
and then shut off. To ensure the pump doesn't short-cycle, the time delay is set to approximately 1 minute.
PIPEWORK REQUIREMENTS FOR PROPER OPERATION
1. Install a spring check valve before the pressure and flow switches – this keeps the pressure in the line
upstream of the valve so the switches can operate properly.
2. Maintain 5x pipe diameter from each switch to avoid turbulence in the line.
3. Pressure switch can be plumbed into a 1/4" tee or cross right at the pump case.
4. Flow switch fits best into a 1" PVC slip bushing with a female thread, galvanized pipe or tee. Trim blade if necessary.
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On Demand Installation Guide
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