48ES and 51ES NXT Stager Controller - Pentair Residential Filtration
48ES and 51ES NXT Stager Controller - Pentair Residential Filtration
48ES and 51ES NXT Stager Controller - Pentair Residential Filtration
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SYSTEM OPERATION IN SERVICE(SYSTEM 14-DEMAND)The system operates as part of a multi-tank regenerationsystem. This example applies to either a 2, 3 or 4 tank system.Each tank in the system will have an active flow meter input,even in St<strong>and</strong>by.The number of tanks In Service depends on the flow rate.Examples of a Four-Unit System:1. One Tank is In Service at all times (the "primary tank").5. The third tank returns to St<strong>and</strong>by as dem<strong>and</strong> decreasespast the second trip point.1 2 3 41 2 3 4In Service(Primary Tank)St<strong>and</strong>by2. The total flow rate to the primary tank increased past thefirst trip point programmed rate. The flow stayed pastthe trip point delayed time. The next tank (least volumeremaining) changes from St<strong>and</strong>by to In Service. This thensplits the total flow between two meters.First Trip Point(Primary Valve)1 2 3 4In ServiceTotal Flow SplitBetween Two MetersSt<strong>and</strong>by3. The flow rate dem<strong>and</strong> decreased below the first trip point.The tank returns to St<strong>and</strong>by.Flow Split BetweenTwo MetersSt<strong>and</strong>by6. Tanks return to St<strong>and</strong>by due to decreased total flow rate<strong>and</strong> trip points programmed. The tank with the mostremaining volume will be the first to go into St<strong>and</strong>by.1 2 3 4Full Capacity4th in St<strong>and</strong>by(Primary Valve)3/4 Capacity3rd in St<strong>and</strong>by1/2 Capacity2nd in St<strong>and</strong>by1/4 Capacity1st in St<strong>and</strong>by7. The primary tank regenerates. The next tank with the leastremaining volume becomes the new primary tank. The tankwith the next least volume remaining will be the first trippoint programmed rate. Tanks continue operating in thisorder.System Operation in Regeneration:1 2 3 4Flow Rate Dem<strong>and</strong>Below First Trip Point(Primary Valve)1 2 3 4St<strong>and</strong>by4. Total flow rate dem<strong>and</strong> increased past a second trip pointprogrammed rate. The second <strong>and</strong> third tank (least volumeremaining) changes from St<strong>and</strong>by to In Service. The totalflow is split between the three meters.Full Capacity4th in St<strong>and</strong>by3/4 Capacity3rd in St<strong>and</strong>by1/2 CapacityFirst Trip PointProgrammed Rate1/4 CapacityNew Primary TankIf two tanks are In Service <strong>and</strong> both reachVolume Remaining = 0, the other two tanks will shift fromSt<strong>and</strong>by to In Service. The lead tank withVolume Remaining = 0 will start Regeneration. The secondtank with Volume Remaining = 0 will enter St<strong>and</strong>by. If flowincreases past the trip point a third tank needs to enter InService. The tank in St<strong>and</strong>by with Volume Remaining = 0 willshift into In Service to maintain a steady flow. Operating forextended periods in this mode may degrade the water quality.1 2 3 4Flow Split BetweenThree MetersSt<strong>and</strong>by4 • <strong>NXT</strong> <strong>Stager</strong> <strong>Controller</strong> AU11
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