5
Flow & Pressure Requirements
Rain Bird C+ Series filters have a minimum pressure requirement of 15 PSI. This
includes any pressure loss incurred during the backwash cycle. Therefore the
pump performance is a crucial component in determining whether the filter will
perform correctly.
Pump manufacturers will provide the performance data in the form of a pump
curve. This is a graph that plots pressure vs. flow rate. A pump is considered
adequate for an application if it can maintain a minimum of 15 PSI while pumping
the normal system flow AND the additional flow required during backwash. The
additional flow depends on the filter model and what valve is used.
C+ SERIES FILTERS
VALVE FLOW RATES
Valve Flow Rate
1" 40 gpm
1.5" 100 gpm
2" 220 gpm
Maintenance & Spare Parts
STARTUP
When pumping water through the Rain Bird C+ Series for the first time or after it
has been emptied, it is important to follow a correct sequence of valve actuation
in order to prevent damage to the filter components.
With both isolation valves closed and the bypass valve open, the correct
sequence is:
1. Slowly open the inlet isolation valve letting water flow into the filter. If
installed, bleed the air through a valve on the top of the filter body. Let the
entire filter fill with water before moving to the next step.
2. Close the bypass valve.
3. Open the outlet isolation valve.
If it is not possible to close the bypass valve momentarily before opening the
outlet valve, then both may be actuated simultaneously.
