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5.1
Understanding requirements for the fresh-water system
10
1" Pump
Inlet Strainer
(40 mesh)
Lower Bowl Water
Supply Line
Freshwater
Holding Tank
General guidelines
•
Follow all applicable local and national regulations, codes, and standards
•
All water supply system plumbing should be 1" ID with a recommended 100 PSI minimum
working pressure rating
•
Water inlet strainer: 1" ID, 40 mesh
•
Pressure gauge: 0 – 100 PSI
Water pump guidelines
•
Grundfos MQ3-35 or equivalent is recommended
•
1" NPT connections
•
Internal pressure switch: 50 PSI cut-out, 30 PSI cut-in
•
MQ3 Pump draw: 8 A @110 V, 4 A @ 220 V (pumps vary by manufacturer)
•
15 gpm required (MQ3 pump rated at 22 GPM max flow with no restrictions)
•
Choose a pump with adequate suction lift capability for pump installation parameters (MQ3
pump has 25' of suction life capability, but varies depending on horizontal run)
Potable water pressure (accumulator) tank guidelines
•
Amtrol Well-X-Trol WX-105-PS or equivalent is recommended
•
3/4" NPT, or larger connections
•
5 gallon total volume, 1.8 gallon drawdown @ 30/50 PSI
•
Air pressure charge: 2-4 PSI below pump cut-in pressure
•
Recommended to use one five-gallon accumulator tank for up to six heads
Pressure relief valve guidelines
I
Installation of a pressure relief valve is recommended by the accumulator tank
manufacturer in order to protect the fresh water system in case of pressure switch
malfunction.
•
Install near accumulator tank and pump
•
Set to open at excessive water system pressures
9
Pressure
Gauge
(0–100 PSI)
Check
High-flow
Valve
Water Pump
Fresh Water To
Other Fixtures
5-Gallon
Switch/Status Panel
Potable Water
Pressure Tank
Rim Water
(30/50 PSI)
Supply Line
Maintenance
Ball Valve
Blackwater
Holding Tank
Toilets
Toilet
Electric High-flow
Water Jet Valve
Check
Valve
EN
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