Franklin Electric Inline 400 User manual

franklinwater.com
INLINE 400 PRESSURE BOOSTING SYSTEM
Installation and Operation Manual

2
COPYRIGHT INFORMATION
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proprietary notices from them.
The information in this publication is provided for reference only and is subject to change without notice. While every effort has been
made to ensure the accuracy of this manual at the time of release, ongoing product improvements and updates can render copies obso-
lete. Refer to 35T35TUwww.franklinwater.comU35T for the current version.
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applicable law, Franklin Electric disclaims all warranties, express or implied, including but not limited to, implied warranties of merchant-
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does not warrant or make any representations regarding the use, validity, accuracy, or reliability of the material in this publication.
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tal, consequential, or other damages, including, but not limited to, loss of data, property damage, or expense arising from, or in any way
connected with, installation, operation, use, or maintenance of the product based on the material in this manual.
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logo displayed on this site, without the express written permission of Franklin Electric.
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Franklin Electric
Technical Publications
9255 Coverdale Road
Fort Wayne, IN 46809

TABLE OF CONTENTS
3
TABLE OF CONTENTS
SAFETY INSTRUCTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4
PRODUCT INFORMATION- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5
Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5
Features- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5
Models - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5
Pump Components - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6
What’s in the Box - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6
INSTALLATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7
Environmental Requirements- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7
Special Considerations for Outdoor Use- - - - - - - - - - - - - - - - - - - - - - - - - - - 7
Location - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7
Pressure Tank - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7
Inline 400 Mounting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8
Orientation of the Inline 400 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8
Flow Direction- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9
Plumbing Considerations for Priming Purposes - - - - - - - - - - - - - - - - - - - - - - - 9
Typical Installation Diagram - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10
Plumbing Installation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 11
Electrical Installation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12
OPERATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12
Priming the System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12
Adjusting Performance - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13
Effect of System Leaks- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 14
Status Display - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15
Protection Features - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16
Maximum Inlet Pressure - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16
Maximum Output Pressure- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16
Maximum Operating Temperature - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16
MAINTENANCE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17
Draining the System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17
Cleaning the Flow Piston - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17
Re-calibration of Control Head - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 18
Troubleshooting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19
STANDARD LIMITED WARRANTY - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 20

SAFETY INSTRUCTIONS
Hazard Messages
4
SAFETY INSTRUCTIONS
Hazard Messages
This manual includes safety precautions and other important
information in the following formats:
IMPORTANT: Identifies information that controls correct assem-
bly and operation of the product.
NOTE: Identifies helpful or clarifying information.
This symbol alerts the user to the presence of dangerous
voltage inside the product that might cause harm or elec-
trical shock.
This symbol alerts the user to the presence of hot sur-
faces that might cause fire or personal injury.
Before Getting Started
This equipment should be installed and serviced by technically
qualified personnel who are familiar with the correct selection
and use of appropriate tools, equipment, and procedures. Failure
to comply with national and local electrical and plumbing codes
and within Franklin Electric recommendations may result in elec-
trical shock or fire hazard, unsatisfactory performance, or equip-
ment failure.
Read and follow instructions carefully to avoid injury and prop-
erty damage. Do not disassemble or repair unit unless described
in this manual.
Refer to product data plate(s) for additional operating instruc-
tions and specifications.
Failure to follow installation or operation procedures and all
applicable codes may result in the following hazards:
Indicates an imminently hazardous situation
which, if not avoided, will result in death or
serious injury.
Indicates a potentially hazardous situation
which, if not avoided, could result in death or
serious injury.
Indicates a potentially hazardous situation
which, if not avoided, could result in minor or
moderate personal injury.
Indicates a potentially hazardous situation
which, if not avoided could result in damage to
equipment or other property.
High voltages capable of causing severe
injury or death by electrical shock are
present in this unit.
• To reduce risk of electrical shock, disconnect power before
working on or around the system. More than one discon-
nect switch may be required to de-energize the equipment
before servicing.
• Be certain that this pump is connected to a circuit
equipped with a ground fault circuit interrupter (GFCI)
device if required by code.
• Check electrical outlets with a circuit analyzer to ensure
power, neutral, and ground wires are properly connected.
If not, a qualified, licensed electrician should correct the
problem.
• Wire pump system for correct voltages.
Risk of bodily injury, electric shock,
or property damage.
• This equipment must not be used by children or persons
with reduced physical, sensory or mental abilities, or lack-
ing in experience and expertise, unless supervised or
instructed. Children may not use the equipment, nor may
they play with the unit or in the immediate vicinity.
• Equipment can start automatically. Lockout-Tagout before
servicing equipment.
• Operation of this equipment requires detailed installation
and operation instructions provided in this manual for use
with this product. Read entire manual before starting
installation and operation. End User should receive and
retain manual for future use.
• Keep safety labels clean and in good condition.
• Keep work area clean, well-lit, and uncluttered.

PRODUCT INFORMATION
Description
5
PRODUCT INFORMATION
Description
The Franklin Electric Inline 400 Pressure Boosting System provides consistent water pressure boosting in
residential and small commercial applications that suffer from low water pressure or demand-based fluctu-
ating water pressure. When added to the existing water supply, the Inline 400 senses fluctuating water
pressure, and automatically increases pressure throughout the system.
The Inline 400 is equipped with a flow sensor and dual pressure switches. It will turn on when the:
• Discharge pressure drops below 40 psi (2.8 bar), or
• Flow through the Inline 400 is ½ gpm (1.9 lpm) or greater
The Inline 400 system stops boosting pressure when the demand for water drops below the ½ gal-
lon-per-minute (1.9 lpm) flow rate (pump will turn off around 15 seconds after the flow stops). The
unit can also be manually shut down during normal operation by pressing the pushbutton on the cap.
The Inline 400 is easy to install (mounting either vertically or horizontally) while working with vir-
tually any existing plumbing configuration.
NOTE: Horizontal installations are approved for INDOOR use only. Vertical installations are
approved for OUTDOOR use when the clear protective cover is installed.
Features
Configuration
• Plug-in electrical cord connected unit (60 Hz models only)
• Installs vertically or horizontally
• 1 ¼" NPT (BSPT for 50 Hz model) Inlet and Outlet
• Includes pressure tank if ordered as accessory
• Maximum Inlet Water Temperature: 120 °F / 49 °C
Operation
• Two LED indicators for system status and troubleshooting
• Simple flow-based controls boost pressure on demand
• Single phase operation
• Maximum suction lift of 5 feet (1.5 m)
Protection
• Overvoltage (+10% of rated)
• Undervoltage (-10% of rated)
• Dry Run (i.e. motor is running but no pressure or flow is being developed)
• Overheat (greater than 120 °F internal water temperature)
Models
Model Input
Voltage Hz HP Current Power Phase Maximum Boost Maximum System Maximum Flow Enclosure Type Weight
Inline 400 115 VAC 60 ⅓6.6 A 710 W 1 55 psi
3.79 bar
95 psi
6.55 bar
20 gpm
75 lpm
CSA
Type 3
35 lbs.
16 kg
Inline 400 230 VAC 60 ⅓3.3 A 710 W 1 55 psi
3.79 bar
95 psi
6.55 bar
20 gpm
75 lpm
CSA
Type 3
Inline 400 50 Hz 220-230
VAC 50 ½2.7 A 630 W 1 50 psi
3.45 bar
90 psi
6.21 bar
16 gpm
60 lpm IP24

PRODUCT INFORMATION
Pump Components
6
Pump Components
What’s in the Box
1. Inline 400 Pressure Boosting System
2. Owner’s Manual
3. Pressure Tank (if ordered as part of the system)
All Franklin Electric Inline 400 Pressure Boosting Systems are carefully tested, inspected, and
packaged to ensure their arrival in perfect condition. When the unit is received, examine it closely
to make sure there is no damage that may have occurred in shipping.
If damage is evident, report this immediately to your shipping carrier and product dealer. The ship-
ping carrier assumes full responsibility for the shipment’s safe arrival. Any claim for damage to the
shipment, either visible or concealed, must be made through the shipping carrier first.
1
2
3
4
5
6
7
8
9
10
11
1. Head Cover Screws (6 total) 2. Power Cord (No plug end on 50 Hz models)
3. Pump Inlet 4. Mounting Bracket
5. Pump Housing 6. 1/4” NPT Drain Plug
7. Mounting Bolts (2 total) 8. Air Bleed Valve
9. Pump Outlet 10. Protective Weather Cover
11. Status Display

INSTALLATION
Environmental Requirements
7
INSTALLATION
Environmental Requirements
Special Considerations for Outdoor Use
For outdoor vertical installations of the Inline 400, the enclosed protective weather cover should be used for
maximum protection of the unit. It is not recommended that the Inline 400 be installed horizontally for out-
door applications where the unit would be directly subjected to inclement weather. Failure to use this pro-
tective cover in outdoor installations will void the warranty of the Inline 400 unit.
To attach the protective weather cover, after the Inline 400 unit has been
installed, simply attach the cover over the top of the unit using the reusable fas-
tener. The cover allows viewing of the operation lights of the unit, but does not
allow access to the user interface pushbutton. The cover must be removed to
press the user interface pushbutton. After the required pushbutton activation is
completed, the protective weather cover must be reassembled to the unit.
1. Vertically Mounted Inline 400
2. Protective Weather Cover
3. Reusable Fastener
Location
Decide on a location for the pump installation that is suitable for the Inline 400.
Choose a clean, well-ventilated location that provides protection from freezing,
flooding, and excessive heat. In addition, it should provide access for servicing
and allow convenient draining of the pump housing, tank, and service pipes.
NOTE: Install the Inline 400 away from items that could be damaged by water
leaks. Priming and bleeding air from the system can produce wet conditions.
Pressure Tank
Consider using a pressure tank. The pressure tank serves two purposes:
1. It allows for small volumes of water to be used without starting the Inline
400.
2. It adds a pressure buffer to the system in order to absorb undesired pres-
sure spikes (water hammer) or pressure fluctuations.
Risk of malfunction can occur due to improper handling, installation, or
environment.
• Handle with care to prevent damage to the plastic components.
• Do not mount on equipment with excessive vibration.
• Install in a location where temperature is within the range of product rating.
• Do not install in corrosive environments.

INSTALLATION
Inline 400 Mounting
8
Inline 400 Mounting
Orientation of the Inline 400
It is preferred (for ease of priming) to install the Inline 400
unit in a VERTICAL orientation.
However, the unit can be installed in the HORIZONTAL
position as long as the air-bleed valve is facing upwards
(arrow) and the pump is laying horizontally. Never allow
the pump to hang unsupported from a horizontal surface;
never use the plumbing for pump support. Always use the
mounting bracket for pump support.

INSTALLATION
Inline 400 Mounting
9
Flow Direction
In VERTICAL installations, the Inline 400 comes standard with the flow direction being from LEFT to RIGHT
when mounted vertically on a wall. In this orientation, you can view the status display and the label (1) is in
front.
The flow direction can be easily changed to RIGHT to LEFT by removing two pump
mounting bolts (2), rotating the pump 180 degrees, and re-installing the two
mounting bolts. There are four mounting lugs on the unit, so you can rotate the
pump in 90° increments (in relation to the mounting bracket) if desired.
It is possible to rotate the control cap. Remove six control cap screws (3) and rotate
the cap in 60 degree increments to place the status display in a viewable orienta-
tion.
NOTE: Be careful when rotating the control cap as there is an electrical cable
attached to it.
Plumbing Considerations for Priming Purposes
The Inline 400 needs to be primed with water before it can function properly. There is an internal check
valve built into the unit that needs to open during priming. This requires that the priming water has an
incoming pressure of 1.5 psi (0.1 bar) minimum. This is especially important if the application involves boost-
ing water out of a shallow cistern. There are two ways to accomplish this in the suction plumbing:
PRIMING DIAGRAM: 1.5 psi (0.1 bar) can be
achieved on the inlet by pouring water through a 3
feet (91 cm) vertical water column. Be sure to keep
the inlet valve closed and open the air-bleed valve
until all air is purged from unit. Close the air bleed
valve.
INSET PRIMING DIAGRAM: Adequate inlet pres-
sure/flow can be achieved on the inlet by connect-
ing a working garden hose to a fitting on the inlet
side of the pump and running water into the pump.
Be sure to keep the inlet valve closed, turn on the
garden hose water supply, and open the air-bleed
valve until all air is purged from unit. Close the air
bleed valve.
1. Shut off valve for priming
2. Priming Inlet line
3. Outlet line
4. Outlet valve
5. Air Bleed Valve (Vent)
6. Add water or connect garden hose (inset
image) here
7. Three feet (91 cm) minimum
1
3
4
5
6
7
6
1
2
2
1
2
3

INSTALLATION
Typical Installation Diagram
10
Typical Installation Diagram
1. Water from source
2. Inline 400
3. Power Cord (No plug end on 50 Hz models)
4. Ball Valve
5. Pressure Tank (no further away than 5’ / 1.5 m from the pump)
6. Pressure Gauge
7. Inlet Pressure Reducing Valve (optional)
8. Outlet Pressure Reducing Valve (optional)
9. Pressure Relief Valve
10. Union Coupling
11. Pipe Tee
12. Check Valve
1
2
3 5
6
7
9
6
8
4
4
4
10
10
11 12 11
11

INSTALLATION
Plumbing Installation
11
Plumbing Installation
1. Close all water supply valves necessary to turn off the incoming water supply. Carefully drain the exist-
ing plumbing system of all water. Make adjustments to existing plumbing to accommodate the addition
of the Inline 400 plumbing.
2. Install the Inline 400 in the desired location using mounting bracket and mounting screws, refer to
“Inline 400 Mounting” on page 8. Screws for mounting the bracket are not included with the product.
• For ease of service, leave a clearance of 20 inches (51 cm) below the pump for housing removal.
This can be reduced if the unit is installed with two plumbing unions shown as (10) in the “Typical
Installation Diagram” on page 10. This makes it easy to remove the entire pump from the system
for servicing.
3. Install inlet and outlet plumbing to the unit. The inlet and outlet of the Inline 400 are labeled with
“INLET” and “OUTLET” respectively. Using ball valves (4) in the system allows for a “service bypass” so
the typical household can still have incoming water if unit maintenance is required.
• Unions (10) should be installed on the suction and discharge ends of the Inline 400.
• Use of PTFE thread sealant tape is recommended over paste; do not over tighten.
• An internal check valve is provided on the discharge of the pump. This valve prevents back flow.
• If the optional bypass loop is used, a check valve (12) should also be installed in the bypass.
• Be sure to check all local plumbing codes to ensure that all requirements pertaining to back flow
prevention are met.
4. Install the bladder-type pressure tank (5) (maximum recommended size: 2 gallon/8 liter) downstream
from the pump. The tank should be located within 5 feet (1.5 m) of the pump discharge.
• There should be no control/check valve between the pressure tank and the Inline 400.
• The tank should be charged no greater than 2 psi (0.1 bar) below the outlet pressure switch set-
ting. Factory outlet pressure switch setting is 40 psi (2.8 bar), therefore maximum tank pre-charge
is 38 psi (2.6 bar) for factory settings.
• The tank pre-charge pressure shall never exceed 80 psi (5.5 bar).
5. Install a pressure gauge (6) on both the inlet and outlet pipes. These will be required in order to prop-
erly adjust the system, as well as aid in potential system troubleshooting.
6. If the incoming supply is above 40 psi (2.8 bar), a pressure reducing valve (7) may be installed on the
inlet.
7. The Inline 400 will boost a downstream pressure equal to 55 psi (3.8 bar) + incoming psi. If the discharge plumb-
ing, fixtures, and appliances are not rated for these higher pressures, it is recommended to install a pressure
reducing valve (8) after the pressure tank to limit the max downstream pressure.
8. Install a pressure relief valve (9) downstream of the Inline 400. This discharge must be plumbed to a
drain rated for maximum pump output at relief pressure settings.

OPERATION
Electrical Installation
12
Electrical Installation
Employ a licensed electrician to perform all wiring. All wiring must be done in accordance with applicable
national and local electrical codes.
1. Disconnect electrical power at the main breaker.
2. The pump should be wired to its own circuit, with no other outlets or equipment in the circuit.
3. Verify that the dedicated branch circuit for the Inline 400 is equipped with a 15 amp circuit breaker.
4. Check that the power supply corresponds with the electrical rating of the Inline 400 being installed.
Supply voltage must be ± 10% of the nameplate voltage.
5. Every installation must be grounded. There must be a reliable ground connection between the pump
and the main electric panel.
6. Unit should be plugged into an outlet that matches the voltage of the unit purchased, or wired directly
to a dedicated circuit junction box (for 50 Hz models, as they have no plug on the power cord).
OPERATION
Priming the System
Refer to “Plumbing Considerations for Priming Purposes” on page 9 for additional information.
Prior to system start up, all air must be removed from the entire system. The Inline 400 comes with an air
bleed valve to assist with eliminating the air.
1. Close all system water outlets.
2. Using a small flathead screwdriver, slowly open the air bleed valve (located directly under the pump outlet).
3. Open inlet valves to allow water supply to enter the pump. Be prepared for air mixed with some water to
be discharged through the air bleed valve. It may be handy to have a small bucket to catch the water.
Risk of severe injury or death by electrical shock.
• Always disconnect the electrical power before working on or around the system.
• Check local electrical and building codes before installation. The installation must be in accordance
with their regulations as well as the most recent National Electrical Code (NEC).
• Some pumps are supplied with lead wires and are intended to be hardwired using a junction box or
other approved enclosure. The pumps include a grounding connector. To reduce risk of electric
shock, be certain that it is properly connected to ground.
• Some pumps are supplied with a grounding conductor and grounding-type attachment plug. To
reduce risk of electric shock, be certain that it is connected only to a properly grounded grounding-
type receptacle. Do not remove the third prong from the plug. The third prong is to ground the pump
to help prevent possible electric shock hazard.
Risk of bodily injury or property damage.
• The Inline 400 Pressure Boosting System can develop very high pressure in some situations.
• Always install a pressure relief valve able to pass full pump flow at 120 psi (6.9 bar). Install the pres-
sure relief valve near the pressure tank.
• It might be necessary to install a pressure reducing valve to limit the potential boost. Install the
pressure reducing valve after the pressure tank.

OPERATION
Priming the System
13
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.
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).
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.

OPERATION
Priming the System
14
If the installer desires to change this from a 80 psi–40 psi drop to a 80 psi–50 psi drop, the discharge pres-
sure switch can be adjusted to turn the pump ON when the discharge pressure reaches 50 psi.
Follow these steps:
1. Disconnect the unit from incoming power.
2. Remove the six control cap screws and remove the cap.
NOTE: Be careful when removing the control cap, as there is an electrical cable attached to the cap.
3. Using a 7/32" hex wrench, turn the internal discharge pressure switch screw (2) clockwise one full turn.
This should raise the switch cutoff by 10–12 psi (0.7 - 0.8 bar).
4. Replace the control cap and re-install six control cap
screws.
5. If desired (not required), adjust the pressure tank pre-
charge pressure to a maximum of 2 psi (0.1 bar) below
the new outlet pressure switch setting (48 psi (3.3 bar)
in this example).
NOTE: NEVER adjust the discharge pressure switch to a
setting HIGHER than the SUM of your minimum incom-
ing pressure + 40 psi, as doing so may result in a system
fault (flashing red LED).
Effect of System Leaks
Leaking water systems may cause the system to cycle more than expected. This is due to the unit turning on
when the outlet pressure drops below the preset discharge pressure (factory-set at 40 psi/2.8 bar). Contin-
uous running or a high number of starts and stops will not hurt the controller, pump, or motor. The issue
should still be fixed, if possible, to eliminate an increase in power usage of the system.
1. Water Source INLET
2. Pressure Switch adjustment screw
3. Water OUTLET
1
2
3

OPERATION
Status Display
15
Status Display
The Inline 400 is designed to provide basic feedback regarding the systems current operational state. This
communication is transmitted via the products LED light, integrated into the control head module. The LED
can be seen flashing in a repetitive pattern representing operational state.
If the Inline 400 has detected a fault condition, the repetitive flashes can be counted to determine which
fault the unit is reporting as the cause. “Troubleshooting” on page 19 provides more information on the pos-
sible faults being reported via LED light flashes.
The Inline 400 is equipped with two LED lights to provide system status and diagnostic information.
1. Solid Green Light: Indicates system is powered and is turned ON, but not currently running. The green
solid light will only be present when no faults are active.
2. Flashing Green Light: Indicates the pump is powered, turned ON, and running. A rapid blinking green
light (two blinks per second, followed by one second off) indicates inlet water supply pressure is above
40 PSI. The unit remains on stand-by until the inlet pressure switch detects incoming water pressure
below the 40 PSI limit.
3. Solid Red Light: Indicates the control is powered but currently in the OFF mode. Pressing the button
will toggle the unit into the ON mode.
4. Flashing Red Light: Indicates a FAULT has occurred. The unit will automatically attempt to restart. If an
immediate restart is needed, the button can be pressed to force a reset if the fault is no longer present.
If the problem persists, a qualified water professional should be contacted. See Troubleshooting Guide
for further detail on various fault code LED flash indications.
5. Pushbutton: The pushbutton can be used to turn the unit on or off. When the unit is powered but in the
OFF mode (solid red light), a press of this button will turn the unit ON. If the unit is powered and in the
ON mode (solid green light), a press of the button will shut the unit OFF. The pushbutton can also be
used to force a reset after a fault.

OPERATION
Protection Features
16
Protection Features
Maximum Inlet Pressure
The maximum internal pressure rating of the Inline 400 is 100 psi (6.9 bar). Therefore, the maximum inlet
pressure when added to the maximum Inline 400 pump pressure must not exceed 100 psi (6.9 bar). The
unit incorporates an internal pressure switch that will not allow the unit to turn ON if the inlet pressure
exceeds 40 psi (2.8 bar) either before or during desired operation. The LED display will show rapid green
flash, 2 blinks per second, followed by a 1 second pause.
Example: If you wish to use this booster in an application with 45 psi (3.1 bar) 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 could be used to limit the maximum pressure created.
Maximum Output Pressure
The Inline 400 will maintain a “NO-FLOW” system pressure equal to the incoming pressure (psi/bar) plus
the shut-off pressure from the pump operating curve. For example, if the input pressure is 38 psi (2.6 bar),
at shut off the system will boost an additional 55 psi (3.8 bar). This means ALL plumbing downstream of the
Inline 400 would be subject to maintaining 93 psi (38 psi + 55 psi) or 6.4 bar (2.6 bar + 3.8 bar). If this high
pressure is undesirable due to the condition and/or configuration of the existing plumbing or appliances,
installing a PRV on the discharge of the Inline 400 is recommended to limit the maximum distributed pres-
sure.
Maximum Operating Temperature
The Inline 400 is equipped with two temperature sensors. One is installed integral to the motor to protect
the motor windings. The other is installed in the control head and senses the internal temperature of the
water. In both cases, the unit will fault at a maximum temperature of 120 °F (49 °C) and turn back on when
the temperature drops below 95 °F (35 °C). A control head sensor trip is indicated by a 5 flash pattern, fol-
lowed by a 1 second pause. The Inline 400 Control Head cannot detect a trip of the internal pump’s motor
faulting from an overload.

MAINTENANCE
Draining the System
17
MAINTENANCE
Draining the System
Disconnecting the pump will not necessarily drain all other parts of the piping system. If there are any con-
cerns with the proper procedure or necessity of draining the suction plumbing, contact a water systems pro-
fessional. All Inline 400 systems, piping, and water tanks exposed to freezing weather should be drained
when freezing conditions are expected. There is a drain plug on the bottom of the unit that may be used to
drain the disabled (powered off) system. If there are any concerns with the proper procedure to drain the
system’s pressure tank, contact the tank manufacturer for assistance.
Cleaning the Flow Piston
1. Control Head
2. Phillips Head Screws
3. Flow Cap
4. O-ring
5. Flow Piston
The flow piston may
become clogged with
mineral deposits or
debris.
To clean the Flow Pis-
ton:
1. Disconnect the unit from incoming power.
2. The system may be under pressure. As such, close both the inlet and outlet valves and drain all pressur-
ized water from the system prior to performing maintenance on the flow switch (described above).
3. Remove the six Inline 400 cap screws and remove the cap.
NOTE: Be careful when removing the control cap, as there is an electrical cable attached to the head.
4. Remove the three Phillips screws that hold the flow cap in place.
5. Remove the Flow Cap. The O-ring may come off with the cap or may remain in the head. Remove the
O-ring and make sure it is free of debris. Place it back on the bottom of the Flow Cap.
6. Use a small metal object, such as a screwdriver or nut driver, to retrieve the magnetic Flow Piston from
the cavity (it is magnetic and will stick to the metal object).
7. Clean the Flow Piston with a clean cloth.
8. Clean any debris or residue from the head where the Flow Piston is inserted.
9. Replace the Flow Piston into the Control Head. Press the Flow Cap with the O-ring firmly into the head.
Tighten the three screws to 15 in-lbs (1.7 N-m). Do not over tighten.
10. Replace the Inline 400 cap and tighten six screws to 15 in-lbs (1.7 N-m).
11. Re-calibrate control head (see “Re-calibration of Control Head” on page 18).
Risk of bodily injury, electric shock, or property damage.
• Disconnect power to the unit before attempting to perform maintenance functions.
• All maintenance functions should be performed by a qualified service professional.

MAINTENANCE
Cleaning the Flow Piston
18
Re-calibration of Control Head
There are times, especially after servicing, that the Inline 400 needs to be re-calibrated. This is necessary in
order to re-establish a reference point for the indication of flow.
Follow these procedures for Field Flow Calibration:
1. Remove power from the unit by unplugging it or turning off the circuit breaker (if a 50 Hz direct wired
model).
2. Verify there is no water flowing in the system. This will ensure that the flow piston is in the fully seated
(zero flow) position.
3. While holding down the push button (3) on the status display, plug the
unit’s power cord into the power receptacle (or switch on the breaker, if a
50 Hz direct wired model). Continue holding down the button for five sec-
onds until both the green and red LEDs blink, indicating calibration is com-
plete. Release the button and the red LED should come on solid, indicating
calibration was successful.
4. Open valves/taps to begin water flow and confirm unit is operating properly.
3

MAINTENANCE
Troubleshooting
19
Troubleshooting
The Inline 400 provides basic feedback regarding the system’s current operational state. The product’s LED
lights are integrated into the control head. Refer to “Status Display” on page 17. The LED flashes in a repeti-
tive pattern representing operational state. The repetitive flashes can be counted to determine which fault
the unit is reporting.
Observed Condition Indicator Lights Possible Cause Corrective Action
Unit will not turn on - No green or
red LED illuminated on control cap None Circuit breaker tripped or turned off
• Turn on the circuit breaker.
• Consult a licensed electrician to properly wire the
Outlet/Junction Box.
Unit runs briefly, won’t develop
pressure, then turns off
Flashing Green 10 sec-
onds, then flashing Red
1 flash,
1 second pause
Insufficient water or prime
• Check water supply, valving, and priming sections
of this manual for additional information.
Unit won’t start with demand for
water
Rapid Green flash, 2
blinks per second,
1 second pause
Inlet water pressure above
40 psi (2.8 bar)
• Install a pressure reducing valve on inlet to reduce
inlet pressure, or wait for the inlet pressure to fall
below 40 psi (2.8 bar).
Unit continuously cycles ON/OFF
(Rapid Cycle) Flashing Green
Improper charge pressure
in tank
• Set the pressure in pressure tank to 2 psi lower than
cut-in pressure.
Check valve between tank
and unit
• Place check valve after pressure tank.
Unit won’t turn on
Solid Red Unit is turned OFF • Press the push button on the user interface.
Flashing Red, 1 Flash,
1 Second Pause Dry Run Fault
• Check inlet water supply and valving.
• Make sure outlet pressure switch setting is not
adjusted too high.
Flashing Red,
2 Flashes,
1 Second Pause
Overvoltage (input voltage
higher than +10%)
• Consult a licensed electrician to check the supply
voltage and correct.
Undervoltage (input volt-
age lower than -10%)
• Consult a licensed electrician to check the supply
voltage and correct.
Flashing Red,
3 Flashes,
1 Second Pause
Flow Sensor Component
Failure
• Consult professional for replacement parts or unit.
Flashing Red,
4 Flashes,
1 Second Pause Temperature sensor fault • Consult professional for replacement parts or unit.
Flashing Red,
5 Flashes,
1 Second Pause
Overheating due to exces-
sive water temperature
• Supply cold water to the pump.
Flashing Red,
6 Flashes,
1 Second Pause
Continuous hot water
detected above thermal
limit when unit is not run-
ning
• Improper hot water application of unit. Supply cold
water to the pump.
Unit runs or cycles continuously Flashing Green
Leak or usage exceeds
½ gpm(1.9 lpm) in system
plumbing
• Repair all plumbing leaks.
Internal non-return (check)
valve is blocked or dam-
aged
• Place a new non-return (check) valve before Inline
400 unit in INLET plumbing.
Internal flow piston is stuck
open
• Clean the flow piston (see “Cleaning the Flow
Piston” on page 17)
NOTE: The motor in this Inline 400 unit contains thermal protection that responds to motor current and heat from the motor winding and ambient
temperature. When the combination of current and heat exceeds a pre-determined point, the thermal protector opens and interrupts the circuit.
When the winding temperature returns to a more normal level, the thermal protector will automatically reset.

800.348.2420 | franklinwater.com
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Form 106935101 Rev. 10 06/19
STANDARD LIMITED WARRANTY
Except as set forth in an Extended Warranty, for one (1) year from the date of installation, but in no event more than two (2) years from the
date of manufacture, Franklin hereby warrants to the purchaser (“Purchaser”) of Franklin’s products that, for the applicable warranty period,
the products purchased will (i) be free from defects in workmanship and material at the time of shipment, (ii) perform consistently with sam-
ples previously supplied and (iii) conform to the specifications published or agreed to in writing between the purchaser and Franklin. This lim-
ited warranty extends only to products purchased directly from Franklin. If a product is purchased other than from a distributor or directly
from Franklin, such product must be installed by a Franklin Certified Installer for this limited warranty to apply. This limited warranty is not
assignable or transferable to any subsequent purchaser or user.
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itations and exclusions relating to the products may not apply.
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FAILURE TO WARN.
c. Franklin’s liability arising out of the sale or delivery of its products, or their use, whether based upon warranty contract, negligence, or
otherwise, shall not in any case exceed the cost of repair or replacement of the product and, upon expiration of any applicable warranty
period, any and all such liability shall terminate.
d. Without limiting the generality of the exclusions of this limited warranty, Franklin does not warrant the adequacy of any specifications
provided directly or indirectly by a purchaser or that Franklin’s products will perform in accordance with such specifications. This limited
warranty does not apply to any products that have been subject to misuse (including use in a manner inconsistent with the design of the
product), abuse, neglect, accident or improper installation or maintenance, or to products that have been altered or repaired by any per-
son or entity other than Franklin or its authorized representatives.
e. Unless otherwise specified in an Extended Warranty authorized by Franklin for a specific product or product line, this limited warranty
does not apply to performance caused by abrasive materials, corrosion due to aggressive conditions, or improper voltage supply.
f. With respect to motors and pumps, the following conditions automatically void this limited warranty:
1. Mud or sand deposits which indicate that the motor has been submerged in mud or sand.
2. Physical damage as evidenced by bent shaft, broken or chipped castings, or broken or bent thrust parts.
3. Sand damage as indicated by abrasive wear of motor seals or splines.
4. Lightning damage (often referred to as high voltage surge damage).
5. Electrical failures due to the use of non-approved overload protection.
6. Unauthorized disassembly.