Adjusting Performance - Franklin Electric INLINE 400 Installation And Operation Manual

4. When the air bleed valve stops sputtering and only a fine stream of water is being expelled, close the
air bleed valve.
5. Once the air has been evacuated from the pump, slightly open a system outlet valve. If necessary, start
the pump by pressing the pushbutton. This will put the pump into automatic mode.
6. Open a discharge valve to half open. If, after a few minutes of running, you do not get pressurized
water, repeat the priming process as detailed above.
NOTE: If the unit does not prime in 10 seconds, the pump will stop and the red LED light will flash, in a
one blink pattern on the display. This is due to an UNDERLOAD error condition in which the pump is not
yet incurring a load indicating water is being pumped. Simply press the pushbutton again to allow the
pump to run for an additional 10 seconds in order to attempt prime. REPEAT this as necessary.
7. Once the pump is operating, fully open the discharge valve and a system outlet, letting the pump oper-
ate until the water is running without any air sputtering.
No further priming should be needed unless the pump is drained, or a leak develops in the suction plumbing.
IMPORTANT: NEVER OPEN THE AIR BLEED WITH THE PUMP ON as this may allow air to ENTER the pump
rather than expel it from the system.

Adjusting Performance

When installed properly with an external pressure tank, it is possible to adjust the pump CUT-IN pressure of
the Inline 400 unit.
High voltages capable of causing severe injury or death by electrical
shock are present in this unit.
• Disconnect power to the system before attempting to remove the control cap and adjust the dis-
charge pressure switch.
The Inline 400 pump is factory-set to start boosting (turn pump ON) when the discharge pressure drops
below 40 psi (2.8 bar). In certain applications, it may be desirable to adjust this setting to be higher or
lower. See the example below:
In this example, a home is supplied with pressurized water from the local municipality that fluctuates
between 30 psi (2.1 bar) MAX and 25 psi (1.7 bar) MIN. The Inline 400 adds 55 psi (3.8 bar) to the incoming
water pressure.
MAX Total Downstream Pressure is 30 psi + 55 psi = 85 psi (2.1 bar + 3.8 bar = 5.9 bar)
MIN Total Downstream Pressure is 25 psi + 55 psi = 80 psi (1.7 bar + 3.8 bar = 5.5 bar)
This condition will result in a pressure drop from 80 or 85 psi down to 40 psi before the pump initially turns
ON (this DROP is due to the stored water being discharged from the pressure tank).
OPERATION
Priming the System
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