The Inline 400 is equipped with a flow sensor and dual pressure switches. It turns on when the:

• discharge pressure drops below 40 psi or
• discharge pressure becomes equal to the inlet pressure and
• flow through the Inline 400 is 0.5 gpm (1.9 lpm) or greater.

This starting logic allows for the pressure tank to fully discharge before turning the Inline 400 system unit ON. This will minimize power consumption and increase product life by accommodating small intermittent water usage or leakage.

The pressure tank serves two purposes.

• It allows for small volumes of water to be used without starting the Inline 400.
• It adds a pressure buffer to the system to absorb undesired pressure spikes or fluctuations.

It is recommended to charge the tank to 38 psi when installed.

• The maximum internal pressure rating of the Inline 400 is 100 psi.
• The maximum inlet pressure when added to the maximum Inline 400 pump pressure (see performance chart) must not exceed 100 psi.
• The Inline 400 unit incorporates an internal pressure switch that will not allow the unit to turn ON if the inlet pressure exceeds 40 psi either before or during desired operation.

Example

To use this booster in an application with 45 psi incoming, it is recommended to install a Pressure Reducing Valve (PRV) on the inlet side of the unit. The PRV would be used to maintain a constant pressure below the cut-in pressure and to limit the maximum pressure created.

The Inline 400 will maintain a "NO-FLOW" system pressure equal to the incoming pressure (psi) plus the shutoff pressure from the pump operating curve.

Example

If the input pressure is 38 psi, at shutoff the system will boost an additional 55 psi. This means ALL plumbing downstream of the Inline 400 would be subject to maintaining 93 psi (38 + 55). If this high pressure is undesirable due to the condition and/or configuration of the existing plumbing or appliances, it is recommended to install a PRV on the discharge of the Inline 400 to limit the maximum distributed pressure.

The Inline 400 can be installed horizontally if the discharge port is directed upwards. This orientation places the air bleed valve in the upward position allowing it to function properly during the initial priming of the pump.

Leaking from the weep holes suggests that there is a leaking connection or part inside the Inline 400 control head. Investigate the source of the water. Sources of water leakage include:

• Cracked housing
• Compromised pressure sensors
• Lack of Teflon tape around the pressure sensors
• Leaking flow control O-ring

The tank housing is screwed into the control head and sealed with a large O-ring. If the O-ring is misaligned or broken, a leak may occur. It is recommended to inspect the O-ring and replace as necessary.