Xylem Bell & Gossett Autocirc e3-4 Series User manual

Installation, Operation
and Maintenance Manual
Series e
3-4 / e3-6
Instant hot water recirculating systems

en – Original Instructions
2 Installation, Operation and Maintenance Manual
Table of Contents
1Introduction and Safety ............................................................................................................................................ 4
1.1 Introduction ...................................................................................................................................................... 4
1.2 Safety ................................................................................................................................................................ 4
1.2.1 Danger levels and safety symbols ............................................................................................................... 4
1.2.2 User Safety.................................................................................................................................................... 6
2Handling and Storage............................................................................................................................................... 9
2.1 Handling of the packed unit ............................................................................................................................ 9
2.2 Unit inspection upon delivery.......................................................................................................................... 9
2.2.1 Inspect the package ..................................................................................................................................... 9
2.2.2 Unpacking and inspection of the unit ......................................................................................................... 9
2.3 Unit handling .................................................................................................................................................. 10
2.4 Storage ........................................................................................................................................................... 10
3Technical Description............................................................................................................................................. 11
3.1 Designation .................................................................................................................................................... 11
3.2 Integrated features and functions .................................................................................................................11
3.3 Data plate ....................................................................................................................................................... 12
3.4 Model description ..........................................................................................................................................12
3.5 Names of the main components and accessories ........................................................................................13
3.6 Intended use...................................................................................................................................................14
3.7 Improper use ..................................................................................................................................................16
4Installation ............................................................................................................................................................... 17
4.1 Precautions ..................................................................................................................................................... 17
4.2 Installation area .............................................................................................................................................. 17
4.3 Hydraulic connection ..................................................................................................................................... 18
4.3.1 Guidelines for the hydraulic system ..........................................................................................................18
4.3.2 Installation ..................................................................................................................................................22
4.3.3 Rotation of the pump motor ......................................................................................................................25
4.4 Electrical connection...................................................................................................................................... 27
4.4.1 Ground........................................................................................................................................................ 27
4.4.2 Guidelines for electrical connection..........................................................................................................28
4.4.3 Guidelines for timer connection ................................................................................................................ 29
5Use and Operation..................................................................................................................................................30
5.1 Precautions ..................................................................................................................................................... 30
5.2 Before starting................................................................................................................................................30
5.3 First starting .................................................................................................................................................... 30
5.4 Air purge.........................................................................................................................................................31
5.5 Setting the timer.............................................................................................................................................31
5.6 Operation modes ........................................................................................................................................... 33

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Installation, Operation and Maintenance Manual 3
5.6.1 Fix speed models ....................................................................................................................................... 33
5.6.2 Variable speed models ..............................................................................................................................33
5.6.3 Fix speed models with fix value temperature control ..............................................................................33
5.6.4 Fix speed models with variable value temperature control..................................................................... 33
5.6.5 Autocirc pumps ..........................................................................................................................................34
5.6.6 LED light ..................................................................................................................................................... 34
5.6.7 Motor protection from overtemperature ..................................................................................................34
5.6.8 Dry run protection ......................................................................................................................................35
5.6.9 Power Down Reset (PDR)...........................................................................................................................35
5.6.10 Temperature sensor error mode ...........................................................................................................35
6Maintenance............................................................................................................................................................36
6.1 Precautions ..................................................................................................................................................... 36
6.2 Maintenance ...................................................................................................................................................36
6.3 Autocirc pumps .............................................................................................................................................. 37
6.4 Disassembly....................................................................................................................................................37
7Troubleshooting......................................................................................................................................................38
7.1 Precautions ..................................................................................................................................................... 38
7.2 Error signals....................................................................................................................................................38
7.3 Pump not running .......................................................................................................................................... 38
7.4 Pump running for 1 minute periods only (temperature controlled models only).......................................38
7.5 Noise in the system ........................................................................................................................................39
7.6 Water taking too long to get to faucet/tap ...................................................................................................39
7.7 Signs of dry run .............................................................................................................................................. 39
8Technical Information .............................................................................................................................................40
8.1 Certifications................................................................................................................................................... 40
8.2 Operating environment .................................................................................................................................40
8.3 Pumped liquid ................................................................................................................................................40
8.4 Electrical characteristics................................................................................................................................. 40
8.5 Mechanical characteristics ............................................................................................................................. 41
8.6 Dimensions and weights................................................................................................................................41
8.7 Hydraulic curves ............................................................................................................................................. 43
8.8 OEM models................................................................................................................................................... 45
9Disposal...................................................................................................................................................................46
9.1 Precautions ..................................................................................................................................................... 46
10 Warranty .............................................................................................................................................................47

en – Original Instructions
4 Installation, Operation and Maintenance Manual
1Introduction and Safety
1.1 Introduction
Purpose of this manual
This manual provides information on how to do the following in the correct manner:
•Installation
•Operation
•Maintenance
CAUTION:
This manual is an integral part of the unit. Make sure to have read and
understood the manual before installing the unit and putting it to use.
Failure to follow these instructions can cause
personal injury and damage to
property, and may void the warranty and
result in
the loss of all entitlement to
claim damages.
NOTICE:
The manual must always be made available to the user
either as a printout or a
s
a downloaded and offline stored electronic file.
Supplementary instructions
The instructions and warnings of this manual apply to the standard unit as described in the sale
documentation. Special version pumps may be supplied with supplementary instruction
manuals. For situations not considered in the manual or in the sales document, contact Xylem
or the Authorized Distributor.
1.2 Safety
WARNING:
•
The operator must be aware of safety precautions to prevent physical injury.
•
Operating, installing, or maintaining the unit in any way that is not covered in
this manual could cause death,
serious personal injury, or damage to the
equipment. This includes any modification to the equipment or use of parts
not provided by Xylem. If there is a question regarding the intended use of
the equipment, please contact a Xylem representative before proceeding.
•
Do not change the service application without the approval of an authorized
Xylem representative.
1.2.1 Danger levels and safety symbols
Before using the unit, the user must read, understand and comply with the indications of the
danger warnings in order to avoid the following risks:
•Injuries and health hazards
•Damage to the product and its surroundings
•Unit malfunction

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Installation, Operation and Maintenance Manual 5
Danger levels
Hazard level
Indication
DANGER:
It identifies a dangerous situation which, if not
avoided, causes serious injury, or even death.
WARNING:
It identifies a dangerous situation which, if not
avoided, may cause serious injury, or even
death.
CAUTION:
It identifies a dangerous situation which, if not
avoided, may cause small or medium level
injuries.
NOTICE:
It identifies a situation which, if not avoided,
may cause damage to property but not to
people.
Complementary symbols
Symbol
Description
Electrical hazard
Hot surface hazard
Danger, system pressurized
Do not use flammable liquids
Do not use corrosive liquids
For indoor use only
Protect the unit against freezing
For indoor use only
Protect the unit against water dripping
For indoor use only
Protect the unit against direct sunlight

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6 Installation, Operation and Maintenance Manual
1.2.2 User Safety
IMPORTANT SAFETY INSTRUCTIONS
CAUTION:
When installing and using this equipment, basic safety precautions should
always be followed. Read, follow and save all these instructions!
WARNING:
To reduce the risk of injury, do not permit children to use this product unless
they are closely supervised at all times.
The pump models covered by this manual are certified generally under the safety standard UL
778, but in case of some special OEM models (usually with plastic pump housing for spa
application) the UL 1081 certification is also available. This reference is indicated on the data
plate, see item 1in Figure 1 on page 12.
These pumps are also certified as a Drinking Water System Component according to
NSF/ANSI 61.
SAFETY INSTRUCTIONS according to UL 778
CAUTION:
Acceptable for indoor use only. This pump has been evaluated for use with water
only. Use with maximum 203 °F (95 °C) water.
WARNING: Risk of electric shock
This pump has not been investigated for use in swimming pool or marine areas.
This pump is not submersible.
WARNING: Risk of electric shock
T
his pump is supplied with a grounding conductor and grounding-
type
attachment plug. To reduce risk of electric shock, connect only to a properly
grounded, grounding-type receptacle.
WARNING:
To reduce
the risk of electric shock, replace damaged cord immediately.
For supply connection, use wires acceptable for at least 194 °F (90 °C).
Use copper conductors only.
SAFETY INSTRUCTIONS according to UL 1081
WARNING:
To reduce the risk of electric shock, replace damaged cord immediately.
WARNING: Risk of electric shock
Do not install within an outer enclosure or beneath the skirt of a hot tub or spa.
This pump is not submersible.

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Installation, Operation and Maintenance Manual 7
WARNING: Risk of electric shock
Connect only to a branch circuit protected by a ground
-fault circuit-
interrupter
(GFCI). Contact a qualified electrician if you cannot verify
that the circuit is
protected by a GFCI.
The unit must be connected only to a supply circuit that is
protected by
a
ground
-fault circuit-interrupter (GFCI). Such
a GFCI should be provided by the
installer and should be
tested on a routine basis. To test the GFCI, push the test
button. The GFCI should interrupt power. Push the reset
button. Power should
be restored. I
f the GFCI fails to
operate in this manner, the GFCI is defective. If
the GFCI
interrupts power to the pump without the test button being
pushed, a
ground current is flowing, indicating the possibility
of an electric shock. Do not
use this pump. Disconnect
the
pump and have the problem corrected by a
qualified service
representative before using.
NSF/ANSI 61 limitation
CAUTION:
Do not allow the temperature above 140 °F (60 °C) in systems circulating drinking
water.
California Proposition 65
WARNING: California Proposition 65 warning
This product contains chemicals known to the state of California to cause cancer
and birth defects or other reproductive harm.
Qualified personnel
WARNING:
This unit must be used only by qualified users. Qualified users are people able
to
recognize
the risks and avoid hazards during installation, use and
maintenance of the unit.
General safety rules
•Always keep the work area clean.
•Pay attention to the risks presented by gas and vapors in the work area.
•Avoid all electrical dangers. Pay attention to the risks of electric shock or arc flash hazards.
•Always bear in mind the risk of electrical accidents and burn injuries.
Safety equipment
It is recommended to use the proper safety equipment within the work area:
•Hard hat
•Safety goggles
•Protective shoes
•Protective gloves
•Hearing protection

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8 Installation, Operation and Maintenance Manual
Electrical connections
Electrical connections must be made by certified electricians in compliance with all international,
national, state, and local regulations.
Precautions before work
Observe these safety precautions before you work with the product:
•Make sure that you have a clear path of retreat.
•Allow all system and pump components to cool before you handle them.
•Make sure that the product has been thoroughly cleaned.
•Disconnect and lock out power before you service the pump.
Precautions during work
Observe these safety precautions when you work with the product:
•Rinse the components in water after you disassemble the pump.
•Do not exceed the maximum working pressure of the pump.
•Do not open any vent or drain valve or remove any plugs while the system is pressurized.
Make sure that the pump is isolated from the system and that pressure is relieved before you
disassemble the pump, remove plugs, or disconnect piping.

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Installation, Operation and Maintenance Manual 9
2Handling and Storage
2.1 Handling of the packed unit
WARNING:
Take appropriate measures during transport, installation and storage to prevent contamination
from external
substances.
The Manufacturer delivers the unit and its components in a cardboard box.
2.2 Unit inspection upon delivery
2.2.1 Inspect the package
1. Check that quantity, descriptions and product codes match the order.
2. Check the packaging for any damage or missing components.
3. In case of immediately detectable damage or missing parts:
- accept the goods with reserve, indicating any findings on the transport document, or
- reject the goods, indicating the reason on the transport document.
In both cases, promptly contact Xylem or the Authorized Distributor from whom the product was
purchased.
2.2.2 Unpacking and inspection of the unit
CAUTION: Cut and abrasion hazard
Always wear personal protective equipment.
1. Remove packing materials from the product. Dispose of all packing materials in accordance
with local regulations.
2. Check the unit for integrity and to make sure that there are no missing components.
3. In case of damage or missing components, promptly contact Xylem or the Authorized
Distributor.
Content of the package
•Pump unit
•Union fitting for 1/2” copper pipe — 1-18 UNSx1/2” — 2 pcs.
(for models: e3-
__
/BU
___
only)
•Fixing bracket
(for models: e3-4V/BAP
_
C only)
•Fixing screw — 5/32”x1 9/16” (4x40 mm) — 2 pcs.
(for models: e3-4V/BAP
_
C only)
•Plastic anchor for wall mount — 1/4”x1 3/16” (6x30 mm) — 2 pcs.
(for models: e3-4V/BAP
_
C only)
•Safety Instructions and Quick Startup Guide

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10 Installation, Operation and Maintenance Manual
2.3 Unit handling
WARNING: Electrical hazard
Holding the unit by the
supply cord is strictly forbidden.
WARNING:
During
handling, make sure to avoid injury to people and animals, and/or damage to property.
2.4 Storage
Storage of the packed unit
The unit must be stored:
•In a covered and dry place
•Away from heat sources
•Protected from dirt
•Protected from vibrations
•At an ambient temperature between -40 °F and 185 °F (-40 °C and 85 °C), and relative
humidity between 5 % and 95 %.
NOTICE:
Do not place heavy loads on top of the unit.
NOTICE:
Protect the unit from collisions.

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Installation, Operation and Maintenance Manual 11
3Technical Description
3.1 Designation
Domestic hot water circulating pump.
OEM applications
For special OEM applications the pump has customized versions, which differ from the standard
versions in one or more features of the followings:
•Special software functions
•Customized power supply cable (special connectors or terminals)
•Alternative circulating fluid
•Built-in applications (water pumps for use in water heaters, spas, etc.)
3.2 Integrated features and functions
Identification based on part number:
60A
_ _
0
… 60A
_ _
1
… 60A
_ _
2
…
60A
_ _
3 …
60A
_ _
4
… 60A
_ _
5
… 60A
_ _
6
…
Fix speed
•
•
Variable speed
•
•
PWM control
○**
Temperature control
•
•
Timer control
•
•
•
Standby mode
•
○*
•
○*
Air purge function
•
○*
•
○*
Error code flashing LED light
•
○*
•
○*
Dry run protection
○**
○**
Power Down Reset
○**
○**
*The function is available only in models with control knob
** The function is available only in special OEM models
Identification based on model description:
e3-
_ _
/
BT
_ _ _
e3-
_ _
/
BS
_ _ _
e3-
_ _
/
BU
_ _ _
e3-4V/
BA
P
_
C
Brass pump housing
•
•
•
•
Integrated shut-off valve
•
Integrated check valve
•
Integrated air vent
•
Internal 1/2-14 NPT thread connections
•
Sweat connections for 1/2” copper pipes
•
External 1-18 UNS thread connections
•
External 1/2-14 NPT thread
connections for water inlet
•
External 9/16-24 UNEF thread
connections for water outlet
•

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12 Installation, Operation and Maintenance Manual
3.3 Data plate
Figure 1
No.
Description
No.
Description
1
Applied UL standard
7
Technical code
2
Rated voltage
8
Nominal system pressure
3
Frequency
9
Maximum water temperature
4
Input power
10
Maximum water temperature for using
with drinking water (NSF 61 classified)
5
Serial number incl. manufacturing date
6
Part number
11
Model description
3.4 Model description
Figure 2
No.
Description
Notes
1 Series model name
e
3
2
Maximum flow
4 = 4 gpm (15 l/min)
6 = 6 gpm (23 l/min)
3
Motor control*
V = Variable speed
P = PWM control (only for OEM applications)
F = Fix speed
4
Pump housing material*
B = Brass
D = Plastic for drinking water (NSF 61 compliant)
S = Stainless steel
P = Plastic, not approved for drinking water
5
Pump housing connection*
H = Hose
T = Threaded
S = Sweat
U = Union
A = Autocirc
X = Drive unit (without pump housing)
6
Power cord
P = With cord
X = Without cord
7
Temperature control
Q = Temperature control, fix value
R = Temperature control, adjustable
Y = Without temperature control
8
Timer control
C = With built-in timer
Z = Without timer
9
Constructional variations*
01-49 = Not potted models
50-99 = Potted models (only for OEM applications)
*Not all the listed options are covered by this manual

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Installation, Operation and Maintenance Manual 13
3.5 Names of the main components and accessories
Figure 3
No.
Description
No.
Description
1 End cap 12 Pump housing Autocirc (code:
BA
)
2 Control knob 13 Fixing bracket
3 Stator (pump motor) 14 Screw 5/32”x1 9/16” (4x40 mm); 2 pcs.
4 Cable gland 15 Plastic anchor 1/4”x1 3/16” (6x30 mm);
2 pcs.
5 Screw ring
6 Ceramic bearing ball 16 Pump housing Sweat (code:
BS
)
7 O-ring 17 Union fitting for 1/2” copper pipe; 2 pcs.
8 Rotor with closed impeller 18 Integrated check valve
9 Pump housing 1/2-14 NPT (code:
BT
) 19 Integrated air vent
10 Timer 20 Pump housing 1-18 UNS (code:
BU
)
11 Rotor with open impeller 21 Integrated ball shut-off valve

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14 Installation, Operation and Maintenance Manual
3.6 Intended use
Circulating pump for domestic hot water systems.
If hot water is not used for longer periods of time, the water in the hot water pipe cools off.
Domestic hot water pumps (also called sanitary or drinking water circulating pumps) pump this
cold water back into the water heater via a separate recirculation pipe, or directly into the cold
water supply line (see Figure 5 and Figure 6on page 19 and 20). At the same time fresh hot
water is flowing out of the water heater and provides a constant supply of hot water at the tap.
WARNING: Risk of electric shock
This pump has not been investigated for use in swimming pool or marine areas.
Do not install within an outer enclosure or beneath the skirt of a hot tub
or spa.
This pump is not submersible.
CAUTION:
Acceptable for indoor use only.
This pump has been evaluated for use with water only. Use with
maximum 203 °F (95 °C) water.
Pump selection
The e3-4 series models are designed to handle the recirculation requirements of residences with
a pipe loop (the total length of hot water supply line plus the recirculation line) up to 250 ft (76 m).
The e3-6 series pumps are designed to handle the recirculation requirements of residences and
small apartment complexes with pipe loop runs to 700-1000 ft (213-305 m).
Because the system is pressurized, the number of floors in a home is not taken into consideration
in sizing the circulating pump. The pump has only to produce continuous flow at a pressure
sufficient to overcome the friction losses created by the piping in the house water supply line
and the return line.
NOTICE: Water pressure
A recirculating system is a pressurized system operating at the city water pressure, as
determined by the pressure regulator on your line, or by a well pump, if you are on a well system.
In most residential plumbing systems, water p
ressure is set at 35 psi (241 kPa) and above.
Below 35 psi (241 kPa), water pressure may not be sufficient to fill the pipe diameter, leaving
space for air to accumulate in the lines.
If your system pres
sure is less than 35 psi (241 kP
a), use the next larger pump on the Pump
Selection Guide.
NOTICE: Oversized pumps
Pumps should not be so large as to produce flow rates that may eventually erode holes in the
pipes. According to the Copper Development Association, excessive erosion occurs at a velocity
of about 5
ft (1.5 m) per second and higher; or about 4 gpm (15 l/min) in 1/2" Ty
pe M copper
pipe
.
Use the recommended recirculation line size shown in the Pump Selection Guide.
The
e3series
pumps are sized so that flow velocities are below these limits.
Autocirc pumps
In case using an Autocirc pump, there is no need to build a separate recirculation line, the unit
should be installed under the sink farthest from the water heater, where hot water takes longest
to arrive. The pump then moves the cool water in the hot water supply line into the cold water
supply line, ensuring instant availability of shower warm water with maximum temperature hot
water only seconds behind. When the pump is off, a built-in auto closure device prevents hot
and cold water mixing. Hot water will also be instantly available at all other faucets/taps between
the water heater and the sink under which the Autocirc pump is installed. See the operating
principle in Figure 4on page 15.

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Installation, Operation and Maintenance Manual 15
Figure 4
No.
Description
No.
Description
1 Pump inlet from hot water supply line 3 Pump outlet to faucet/tap for cold water
2 Pump outlet to faucet/tap for hot water 4 Pump inlet from cold water supply line
Pumped liquids
CAUTION:
This pump has been designed and tested for use with water only.
Its suitability for use with liquids
other than water is the end user's responsibility.
WARNING:
In domestic hot water systems, the water is recommended to be pumped at a temperature
above 122 °F (50 °C) to prevent the risk of legionella.
NOTICE:
Keep the hot water temperature below 140 °F (60 °C). Higher temperatures can cause calcium
and magnesium elements to come out of solution and create solids which could not only cause
damage to the pump, but also reduce water heater efficiency and premature failure of the water
heater.
Hard Water Conditions
Use a water conditioner if you have hard water. Hard water can cause scale build-up and
eventually reduce the life of the pump and other system components.
OEM applications
For use with alternative circulating fluids contact Xylem or the Authorized Distributor.
The liquids must be:
•Clean
•Free of solid – especially metallic - particles or fibers
•Free of mineral oils
•Chemically and mechanically non aggressive
•Non-flammable
•Non-explosive
Observe the operating limits in section 8 Technical Information on page 40.

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16 Installation, Operation and Maintenance Manual
3.7 Improper use
WARNING:
The unit was designed and built for the use described in
section
3.6 Intended use
on page
14.
Any other uses are prohibited, as they could compromise the safety of the user and the efficiency
of the unit itself.
DANGER:
It is prohibited to use this unit to pump flammable and/or explosive liquids.
CAUTION:
It is
prohibited to use the unit to pump aggressive liquids, acids and seawater.
DANGER: Potentially explosive atmosphere hazard
It is prohibited to start the unit in environments with potentially explosive atmospheres or with
combustible dusts
.
WARNING:
It is prohibited to pump drinking water after use with other fluids.
Examples of improper use
•Pumping liquids not compatible with the construction materials of the unit.
•Pumping liquids with temperatures higher than what shown in section 8 Technical
Information on page 40.
•Pumping hazardous, toxic, explosive, flammable or corrosive liquids.
•Pumping seawater.

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Installation, Operation and Maintenance Manual 17
4Installation
4.1 Precautions
Before starting, make sure that the safety instructions shown in section 1.2 Safety on page 4
have been fully read and understood.
DANGER: Potentially explosive atmosphere hazard
It is prohibited to start the unit in environments with potentially explosive atmospheres or with
combustible dusts
.
WARNING:
Always wear
personal protective equipment.
WARNING:
Always use suitable working tools.
WARNING:
When selecting the place of installation and connecting the unit to the hydraulic and electric
power supplies, strictly comply with current regulations.
WARNING:
Remove the unit from its packaging just before installation to prevent contamination from
external substances.
4.2 Installation area
•Only install in dry rooms where the pump and the piping is protected from freezing.
•Install in one of the permitted mounting positions (see Figure 8on page 23).
•Observe the instructions given in the section 8.2 Operating environment on page 40.
WARNING: Risk of electric shock
This pump has not been investigated for use in swimming pool or marine areas.
Do not install within an outer enclosure or beneath the skirt of a hot tub or
spa.
This pump is not submersible.
CAUTION:
Acceptable for indoor use only.
This pump has been evaluated for use with water only. Use with maximum 203 °F (95 °C) water.
WARNING: Hot surface hazard
If the pump, motor or piping are operating at extremely high or low temperature, guarding or
insulation is required.
CAUTION: Property damage hazard
It is not advisable to install circulators in an attic or upper floor over finished living space. If the
circulator must be installed over head, or over expensive equipment, provide adequate
drainage in the event of leakage.
Failure to follow these instructions could result in property
damage.

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18 Installation, Operation and Maintenance Manual
4.3 Hydraulic connection
WARNING:
All the hydraulic connections
must be completed by a technician possessing the technical
-
professional requirements outlined in the current regulations.
WARNING: Excessive system pressure hazard
Piping must be sized to ensure safety at the maximum operating pressure.
The maximum pressure
value of the pump is listed on the data plate. Do not exceed t
his
pressure.
WARNING: Excessive system pressure hazard
The heating of water and other fluids causes volumetric expansion. The associated forces may
cause failure of
system components and the release of high temperature fluids.
This can be prevented by installing properly sized and located compression tanks and pressure
relief valves.
4.3.1 Guidelines for the hydraulic system
Recirculating pumps installed in the return line
•Before starting piping work shut off the water to the house and drain the affected sections of
the plumbing lines and the water heater if necessary.
•Select the sink under which to connect the recirculation line (the sink where the hot water
takes longest to arrive, which is usually the sink farthest from the water heater).
•Use 1/2" tubing for the recirculation line.
•Connect the return line with a tee fitting at the last faucet/taps riser, as close to the end of the
hot water supply line as possible and run the line back to the water heater.
•Decide on the course of the recirculation pipe (also determining the length of the pipe
required) and whether the return line should be connected to the water heater cold water
inlet line (tee fitting required) or to the bottom water heater drain valve ("Y" type fitting
required to fit to existing drain valve outlet). See Figure 5 and Figure 6 on page 19 and 20
for the installation schematic.
•The pump must always be installed in the recirculation line, below the water level of the water
heater.
•Do not mount the pump above the water heater, if possible, install the unit at the lowest point
of the system.
•Do not install the unit pumping away from the water heater, or directly in the supply line.
•Support the pipes independently, so that their weight does not load the unit.
•Check to be sure there are no crimps or sharp bends in the recirculation line that would
restrict the flow.
•Remove any welding residues, deposits and impurities in the pipes that could damage the
unit.
•Check that other units do not come in contact with the unit.
•When using pump models with pump housing code BT or BS (item 9 and 16 in Figure 3 on
page 13), use a 1/2" swing check valve with appropriate closing pressure. This prevents water
from flowing through the pump backwards when any faucet is opened, thus causing damage.
•Install the check valve after the pump in the direction of flow, so that the arrows on the pump
housing and on the check valve point in the same direction.

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Installation, Operation and Maintenance Manual 19
•We recommend, that for pump models with pump housing code BT or BS, you install a ball
shut-off valve before the pump at least, for future maintenance or repair works.
•A properly installed system should include a method of automatically venting the air that
enters the water supply line during use. Air enters the system each time fresh, cold water is
introduced into the hot water heater. Air may also enter the system any time a plumbing line
is opened, for instance during a faucet/taps change or adding a sprinkler system. We
recommend, that for pump models with pump housing code BT or BS, you install an air vent
mounted in a vertical position.
•Pumps with pump housing code BU (item 20 in Figure 3) incorporate a check valve (item 18 in
Figure 3), a ball shut-off valve (item 21 in Figure 3) and a manual air vent valve (item 19 in Figure
3) into the brass pump housing eliminating the need to install these components.
•With the shut-off valve closed at the suction side of the pump and with the check valve
installed at the discharge side, the screw ring (item 5in Figure 3) can be loosen, thus the
pump motor can be turned in proper position (see section 4.3.3 Rotation of the pump motor
on page 25), or even removed for maintenance (see section 6.4 Disassembly on page 37)
without completely draining the system.
•To be able to exclude the complete unit from the system, e.g. for replacement of the pump
housing without draining the whole system, install additional shut-off valves both at the
suction and at the discharge side of the pump.
The next examples in Figure 5 and Figure 6show typical installation arrangements for different
return line connection layout, but for single line returns only. For multiple branched supply line
installations, a recirculation line should be installed for each branch.
Figure 5
No.
Description
No.
Description
1 Tee fitting 7 Circulating pump model
BT
/
BS
2 Hot water return (recirculation) line 8 Ball shut-off valve
3 Hot water supply line 9 Hose bib
4 Cold water supply line 10 Water heater
5 Air vent 11 “Y” fitting
6 Check valve

en – Original Instructions
20 Installation, Operation and Maintenance Manual
Figure 6
No.
Description
No.
Description
1 Tee fitting 5 Circulating pump model
BU
2 Hot water return (recirculation) line 6 Hose bib
3 Hot water supply line 7 Water heater
4 Cold water supply line 8 “Y” fitting
Autocirc pumps
•Select the sink under which the Autocirc pump is to be located (the sink where the hot water
takes longest to arrive, which is usually the sink farthest from the water heater).
NOTICE:
At the sink under which the Autocirc
pump is installed some "lukewarm" water will appear in the
cold water line due to the transfer of water from the hot side to cold side. This lukewarm water
will, however, disappear in a short time (4-5 seconds) once the cold faucet/taps is opened.
•Take care that a 115 V / 60 Hz grounded electrical outlet must be available within 6 feet of
the installation site, as the unit is supplied with a 6 feet long, grounded cord.
NOTICE:
The next installation guide applies to most situations where faucets/taps are connected to the
hot and cold water supply lines with braided flexible hose/shut off valve arrangements. If the
under sink arrangement is different (i.e. the risers are hard copper or plastic), then other parts
may be required for the installation.
•Plan the installation position of the Autocirc pump on the wall under the sink, so that the
existing flexible hoses can be reused and connected to the unit without kinking or straining
(see Figure 7 on page 21). The pump must be installed only in a vertical position as shown.
NOTICE:
Do not fasten
the
pump to a thin wood panel wall as this might create a vibration noise when the
pump is operating.
•Measure the distance between the connections of the pump outlets and the faucets/taps and
purchase two stainless steel flexible hoses (1/2"
— 9/16”) in the length required. If felt
necessary, replace also the existing flexible hoses with new stainless steel braided flexible
hoses in the lengths required.