Grundfos ALPHA 15-55 SUC HWR-D Comfort User manual

ALPHA 15-55 SUC HWR-D Comfort
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

English (US) Installation and operating instructions
Original installation and operating instructions
Table of contents
1. Limited warranty............... 3
2. General information ............. 3
2.1 Hazard statements .............. 3
2.2 Notes ..................... 3
3. Product introduction ............ 4
3.1 Product description .............. 4
3.2 Intended use ................. 4
3.3 Accessories .................. 4
3.4 Pumped liquids ................ 5
3.5 Identification.................. 5
3.6 Approvals for Comfort valves......... 5
3.7 Approvals for ALPHA 15-55 HWR-D ..... 6
4. Receiving the product............ 7
4.1 Inspecting the product ............ 7
4.2 Scope of delivery ............... 7
5. Installation requirements .......... 8
5.1 Location .................... 8
5.2 Tools...................... 8
6. Mechanical installation ........... 9
6.1 Insulating the pump housing ......... 9
6.2 Installing the pump .............. 9
6.3 Changing the pump head position ......10
6.4 Installing the push-button ...........11
6.5 Installing the repeater.............11
6.6 Installing the Comfort valves .........12
7. Electrical connection ............13
7.1 Connecting the line cord ...........14
7.2 Removing the line cord ............14
8. Starting up the product ...........14
8.1 Venting the system ..............14
8.2 Starting the pump ...............14
9. Control functions ..............15
9.1 Pump display .................15
9.2 Push-button LED ...............16
9.3 Repeater LED .................16
9.4 Performance curve ..............17
10. Servicing the product ............18
10.1 Maintaining the product............18
11. Fault finding the product ..........19
11.1 The pump does not start ...........19
11.2 The pump does not start ...........19
11.3 The pump does not start ...........19
11.4 The pump does not start ...........19
11.5 There is a noise in the hydraulic system ..20
11.6 There is noise in the circulator pump. ....20
12. Technical data ................21
12.1 Operating conditions .............21
13. Disposing of the product ..........22
2
English (US)

1. Limited warranty
Products manufactured by Grundfos Pumps
Corporation (Grundfos) are warranted to the
original user only to be free of defects in material
and workmanship for a period of 30 months from
date of installation, but not more than 36 months
from date of manufacture. Grundfos' liability under
this warranty shall be limited to repairing or
replacing at Grundfos’ option, without charge,
F.O.B. Grundfos’ factory or authorized service
station, any product of Grundfos manufacture.
Grundfos will not be liable for any costs of
removal, installation, transportation, or any other
charges that may arise in connection with a
warranty claim. Products which are sold, but not
manufactured by Grundfos, are subject to the
warranty provided by the manufacturer of said
products and not by Grundfos' warranty. Grundfos
will not be liable for damage or wear to products
caused by abnormal operating conditions,
accident, abuse, misuse, unauthorized alteration
or repair, or if the product was not installed in
accordance with Grundfos' printed installation and
operating instructions and accepted codes of
good practice. The warranty does not cover
normal wear and tear. To obtain service under this
warranty, the defective product must be returned
to the distributor or dealer of Grundfos' products
from which it was purchased together with proof
of purchase and installation date, failure date and
supporting installation data. Unless otherwise
provided, the distributor or dealer will contact
Grundfos or an authorized service station for
instructions. Any defective product to be returned
to Grundfos or a service station must be sent
freight prepaid; documentation supporting the
warranty claim and/or a Return Material
Authorization must be included if so instructed.
Grundfos will not be liable for any incidental or
consequential damages, losses, or expenses
arising from installation, use, or any other causes.
There are no express or implied warranties,
including merchantability or fitness for a particular
purpose, which extend beyond those warranties
described or referred to above. Some jurisdictions
do not allow the exclusion or limitation of
incidental or consequential damages and some
jurisdictions do not allow limitations on how long
implied warranties may last. Therefore, the above
limitations or exclusions may not apply to you.
This warranty gives you specific legal rights and
you may also have other rights which vary from
jurisdiction to jurisdiction. Products which are
repaired or replaced by Grundfos or authorized
service center under the provisions of these
limited warranty terms will continue to be covered
by Grundfos warranty only through the remainder
of the original warranty period set forth by the
original purchase date.
2. General information
2.1 Hazard statements
The symbols and hazard statements below may
appear in Grundfos installation and operating
instructions, safety instructions and service
instructions.
DANGER
Indicates a hazardous situation which,
if not avoided, will result in death or
serious personal injury.
WARNING
Indicates a hazardous situation which,
if not avoided, could result in death or
serious personal injury.
CAUTION
Indicates a hazardous situation which,
if not avoided, could result in minor or
moderate personal injury.
The hazard statements are structured in the
following way:
SIGNAL WORD
Description of the hazard
Consequence of ignoring the warning
• Action to avoid the hazard.
2.2 Notes
The symbols and notes below may appear in
Grundfos installation and operating instructions,
safety instructions and service instructions.
FM
Observe these instructions for
explosion-proof products.
A blue or gray circle with a white
graphical symbol indicates that an
action must be taken.
A red or gray circle with a diagonal bar,
possibly with a black graphical symbol,
indicates that an action must not be
taken or must be stopped.
If these instructions are not observed,
it may result in malfunction or damage
to the equipment.
Tips and advice that make the work
easier.
3
English (US)

3. Product introduction
3.1 Product description
The ALPHA 15-55 SUC HWR-D Comfort valve
system is intended for domestic hot-water
recirculation. When you activate the system with
the HWR-D push-button, the pump brings hot
water in an instant to the hot-water faucets in your
home.
Since the system utilizes the existing cold-water
return line in the home, no separate new return
line is required. No electrical power is required
under the sink. The ALPHA 15-55 SUC HWR-D
Comfort valve system includes a circulator pump
that you install on the water heater in your home
and four valves, which you install at your furthest
tap/faucets. The direction of flow moves from the
water heater through the recirculation pump,
through the hot-water supply line, and then back
to the water heater through the existing cold-water
return line.
In large households, one Comfort valve is to be
installed in each hot water string at your furthest
tap/faucets. If you are using a tankless water
heater system, use all four valves.
3.2 Intended use
ALPHA 15-55 SUC HWR-D Comfort is intended
for domestic hot-water recirculation. When you
activate the system with the HWR-D push-button,
the pump starts circulating hot water using your
cold-water lines. The cold water in your hot-water
lines is pushed back to the water heater. The
bypass valve under the sink will close when 95 °F
water reaches the valve. The pump will shut off
after 5 minutes of operation. The pump will not
operate more than 15 minutes in a single hour.
3.3 Accessories
2
1
TM076453
Pos. Description
1
Push-button HWR-D
One push-button is included in the
delivery. Additional push-buttons
may be purchased as accessories.
2
Repeater HWR-D
A repeater is not included but may
be purchased as an accessory to
increase the range of
communication between the push-
button and the pump.
4
English (US)

3.4 Pumped liquids
CAUTION
Chemical hazard
Minor or moderate personal injury
‐Do not use the pump for flammable
liquids, such as diesel or gasoline.
WARNING
Biological hazard
Death or serious personal injury
‐In domestic hot-water systems, the
temperature of the pumped liquid
must always be above 122 °F (50
°C) due to the risk of legionella.
WARNING
Biological hazard
Death or serious personal injury
‐In domestic hot-water systems, the
pump is permanently connected to
the main water supply. Therefore,
do not connect the pump by a
hose.
WARNING
Hot water
Death or serious personal injury
‐If the hot-water temperature is too
high, it can cause severe burns or
scalding.
‐Ensure that the temperature of the
hot-water source is not high
enough to cause burns or scalding.
CAUTION
Corrosive substance
Minor or moderate personal injury
‐Do not use the pump for
aggressive liquids such as acids or
seawater.
The pump is suited for domestic hot water.
Maximum hardness 14 °dH
Maximum temperature 149 °F (65 °C)
Maximum temperature
peak 158 °F (70 °C)
For water with a higher degree of hardness,
contact Grundfos.
3.5 Identification
3.5.1 Nameplate for ALPHA 15-55 HWR-D
Prod. No. XXXXXXXX
CSA ENC 2 Nonsubmersible Pump
Electronically Protected Class F
Min
Amp
Max water temp 230° F
1
2
3 4
5
6
Max
Watt
1 Ph 115V 60Hz
TM072175
Nameplate
Pos. Description
1 Product number
2 Voltage [V]
3
Rated current [A]:
Min.: Minimum current [A]
Max.: Maximum current [A]
4
Input power [W]:
Min.: Minimum power [W]
Max.: Maximum power [W]
5 Maximum liquid temperature [°F]
6 FCC and IC ID
3.6 Approvals for Comfort valves
W
A
TER QUALITY
Drinking water system component
NSF/ANSI 61
NSF/ANSI 372
TM076608
5
English (US)

3.7 Approvals for ALPHA 15-55 HWR-D
Approval marks
TM073285
W
A
TER QUALITY
Drinking water system component
NSF/ANSI 61
NSF/ANSI 372
TM076608
TM073284
FCC sections
Section 15.19 (a) 3
This device complies with Part 15 of the FCC
Rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any
interference received, including interference that
may cause undesired operation.
Section 15.21
Any changes or modifications to this equipment
not expressly approved by the party responsible
for compliance could void the user's authority to
operate this equipment.
Section 15.105 (b)
This equipment has been tested and
found to comply with the limits for a
class B digital device, pursuant to Part
15 of the FCC Rules.
These limits are designed to provide reasonable
protection against harmful interference in a
residential installation. This equipment generates,
uses and can radiate radio frequency energy and,
if not installed and used in accordance with the
instructions, may cause harmful interference to
radio communications. However, there is no
guarantee that interference will not occur in a
particular installation. If this equipment does
cause harmful interference to radio or television
reception, which can be determined by turning the
equipment off and on, the user is encouraged to
try to correct the interference by one or more of
the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between
the equipment and receiver.
• Connect the equipment to an outlet on a
circuit different from that to which the receiver
is connected.
• Consult the dealer or an experienced
radio/TV technician for help.
This equipment complies with FCC/IC radiation
exposure limits set forth for an uncontrolled
environment and meets the FCC radio frequency
(RF) Exposure Guidelines and RSS-102 of the IC
radio frequency (RF) Exposure rules. This
equipment should be installed and operated
keeping the radiator at least 8 in (20 cm) or more
away from person's body.
Cet équipement est conforme aux limites
d'exposition aux rayonnement définies par la
norme FCC / IC pour un environnement non
contrôlé et est conforme aux directives
d'exposition de la FCC en matière de
radiofréquences et la norme RSS-102, des règles
d'exposition aux radiofréquences (RF) de l'IC. Cet
équipement doit être installé et utilisé en
maintenant le radiateur à au moins 8 in (20
cm) du corps de la personne.
Canadian ISED information
These devices (ALPHA 15-55 HWR-D, Push-
button HWR-D and Repeater HWR-D) contain
license-exempt transmitter(s)/receiver(s) that
comply with Innovation, Science and Economic
Development Canada’s license-exempt RSS(s).
Operation is subject to the following two
conditions: 1.This device may not cause
interference. 2.This device must accept any
interference, including interference that may
cause undesired operation of the device.
Innovation, Science and Economic Development
Canada ICES-003 Compliance Label: CAN
ICES-3(B)/NMB-3(B).
L’émetteur/récepteur exempt de licence contenu
dans le présent appareil est conforme aux CNR
d’Innovation, Sciences etDéveloppement
économique Canada applicables aux appareils
radio exempts de licence. L’exploitation est
autorisée auxdeux conditions suivantes : 1.
L’appareil ne doit pas produire de brouillage; 2.
L’appareil doit accepter tout brouillage
radioélectrique subi, même si le brouillage est
susceptible d’encompromettre le fonctionnement.
Étiquette de conformité à la NMB-003
d’Innovation, Sciences et Développement
économique Canada : CAN ICES-3(B)/-3(B).
These devices (ALPHA 15-55 HWR-D, Push-
button HWR-D and Repeater HWR-D) comply
with Industry Canada RSS-247 and license-
exempt RSS standard(s). Operation is subject to
the following two conditions: (1) this device may
not cause interference, and (2) this device must
accept any interference, including interference
that may cause undesired operation of the device.
Ce dispositif est conforme à lanorme CNR-247
d'Industrie Canada applicable aux appareils radio
exempts de licence. Son fonctionnement est sujet
6
English (US)

aux deux conditions suivantes: (1) le dispositif ne
doit pas produire de brouillage préjudiciable, et (2)
ce dispositif doit acceptertout brouillage reçu, y
compris un brouillag e susceptible de provoquer
un fonctionnement indésirable.
4. Receiving the product
4.1 Inspecting the product
• Make sure that the delivered product
corresponds to the order.
• Make sure that the supply voltage and
frequency correspond to the values stated on
the product nameplate.
Take care when handling the product.
Do not drop the product.
4.2 Scope of delivery
The box contains the following items:
Quantity Description
1 ALPHA HWR-D pump
1 Line cord
2 3/4" adapters
2 Push-button HWR-D
1 Check valve
1 "Check valve installed" sticker
4 Comfort valve kits, 1/2" NPSM
8 Flex hoses, 1/2" x 3/8"
1Installation and operating
instructions
7
English (US)

5. Installation requirements
5.1 Location
1
2
3
TM076422
Location of the pump and accessories
Pos. Description
1 Water supply
2 Cold-water supply
3 Hot-water supply
The system is intended for indoor use only in
areas protected from droplets and splashes.
Maximum ambient temperature is 104 °F (40 °C).
Push-button HWR-D
Do not install the push-button HWR-D in a shower
or under the tap or faucet where it could be
exposed to water. Mount it at a suitable height out
of reach of small children and pets.
Repeater
This repeater is only for use with the ALPHA
15-55 HWR-D system and is intended for indoor
installation only in areas safe from droplets and
splashes.
For optimum use, place the repeater between the
ALPHA 15-55 HWR-D pump and the push-button
located furthest away from the pump.
5.2 Tools
You will need the following tools to install the
system:
• Hexagon key 4 mm
• Pipe wrench
8
English (US)

6. Mechanical installation
6.1 Insulating the pump housing
Do not insulate the control box. Do not
cover the operating panel.
TM071424
Insulating the pump housing
6.2 Installing the pump
When making pipe connections, follow the pipe
manufacturer's recommendations and all code
requirements for the pipe material.
WARNING
Pressurized system
Death or serious personal injury
‐Do not hold the pump in place with
tools while tightening the nuts on
the pump housing.
1. Flush the system of debris before installation.
2. Insert the check valve if required.
3. Refer to the arrows on the pump housing
indicating the direction of the liquid flow
through the pump.
4. Install the pump with horizontal motor shaft.
5. Fit the two supplied adapters to the pump
ends.
The pump must always pump away
from the heat source.
TM072178
Check valve installation
TM072176
Installation positions
9
English (US)

6.3 Changing the pump head position
CAUTION
Hot surface
Minor or moderate personal injury
‐Position the pump so that persons
cannot accidentally come into
contact with hot surfaces.
WARNING
Electric shock
Death or serious personal injury
‐Switch off the power supply before
you start any work on the product.
Make sure that the power supply
cannot be switched on accidentally.
WARNING
Pressurized system
Death or serious personal injury
‐Before dismantling the pump, drain
the system or close the isolating
valve on either side of the pump
before you remove the screws. The
pumped liquid may be scalding hot
and under high pressure.
If you change the position of the pump
head, fill the system with the liquid to
be pumped or open the isolating
valves.
• Make any change to the pump
head orientation before filling the system with
liquid.
• You can turn the pump head in steps of
90°. See figure for permissible positions.
• Only use orientations C and D for CSA,
enclosure type 2.
Proceed as follows:
1. If liquid is present, drain the liquid from the
pump or isolate the liquid from the pump.
2. Remove the four socket head cap screws.
3. Turn the pump head to the desired position.
4. Cross-tighten the screws to: 7 ft-lbs torque.
TM072173
Removing the four socket head cap screws on
the pump head
A
B
C
D
TM072177
Pump head positions
10
English (US)

6.4 Installing the push-button
Do not install the push-button in a
shower or under the tap/faucet where it
could be exposed to water. Mount it at
a suitable height out of reach of small
children and pets.
1. Remove the mounting bracket from the back
of the push-button.
2. Remove the pull-tab from the end of the AAA
batteries.
3. Use the included double-sided tape to fasten
the mounting bracket to a surface or wall
away from water droplets or splashes.
4. To pair the push-button with the pump: With
the push-button near the pump, press and
hold the connect button on the pump for 2
seconds. The blue connect symbol will flash.
The connect symbol will stop flashing after 30
seconds if no device has been detected.
5. Press the button on the push-button for 2
seconds. The blue LED on the push-button
will flash.
6. After successful pairing of the push-button
and the pump, the blue light will
be on continuously for 5 seconds on both
devices.
7. If the pairing fails, the light will flash red for 5
seconds on both the pump and the push-
button. Restart installation of the push-button.
8. To verify operation press the button on the
push-button for less than 2 seconds. Check
that the connect symbol on the pump is on
and green for approximately 2 seconds and
the pump turns on.
9. Replace the push-button on the mounting
bracket.
10. If more than one push-button is used for the
system, repeat the installation procedure.
Pull-tab
Double-sided
tape
TM072154
Removing the mounting bracket and the pull-tab
6.5 Installing the repeater
1. Connect the included USB cable to the
repeater.
2. Connect the other end of the USB cable to
the included power adapter.
3. Fit the included plug adapter to the power
adapter.
4. Plug the power adapter into a power outlet to
power on the repeater.
5. The LED on the repeater will light green to
indicate the repeater is in operation.
11
English (US)

6.6 Installing the Comfort valves
Do not use Teflon tape, pipe joint
compound or pipe dope on the valve
threads.
Tighten the flex hose connections, plus
1/4 turn with a wrench. Overtightening
the flex hose connections can result in
valve damage, causing the valve to
leak and/or localized water damage.
When making pipe connections, be
sure to follow the pipe manufacturer’s
recommendations and all code
requirements for pipe material.
By plumbing convention, the hot water
is on the left side and the cold water on
the right side, when looking at the sink.
Your pipes may be different.
6.6.1 Valve location
For the greatest effect, the comfort valve must be
located at a faucet with the greatest pipe distance
from the hot-water heater. If a household consists
of more that one hot-water piping string, a comfort
valve must be mounted in each string.
6.6.2 Disconnecting the risers
1. Close both the hot- and cold-water angle stop
valves below the sink.
Cold-water
angle stop valve
Hot-water
angle stop valve
TM058973
2. Disconnect the risers.
Risers
TM058975
6.6.3 Installing the thermal bypass valve
Mounting hardware is not included.
1. Connect the 1/2" x 1/2" flex hoses to the
ports on the thermal bypass valve marked
HOT OUT and COLD OUT.
2. Connect the 1/2" x 3/8" flex hoses to the
ports on the thermal bypass valve marked
HOT IN and COLD IN.
3. Connect the 1/2" hose fitting from the HOT
OUT port on the thermal bypass valve to the
left side of the faucet.
4. Connect the 1/2" hose fitting from the COLD
OUT port on the thermal bypass valve to the
right side of the faucet.
5. Connect the 3/8" hose fitting from the HOT IN
port on the thermal bypass valve to the left
angle stop valve.
6. Connect the 3/8" hose fitting from the COLD
IN port on the thermal bypass valve to the
right angle stop valve.
7. Open both hot- and cold-water angle stop
valves. Check for leaks.
1/2” x 1/2”
1/2” x 1/2”
1/2” x 3/8”
1/2” x 3/8”
To the faucet
HW CW
HW OUT
HW IN CW IN
CW OUT
TM058976
Connection of thermal bypass valve, flex hoses,
and fittings
8. The thermal bypass valve may be mounted to
the wall with screws if desired.
TM058977
Correct installation of thermal bypass valve
(mounting hardware not included)
12
English (US)

9. For troubleshooting, see the section Fault
finding the product.
6.6.4 Checking for proper pump and bypass
valve operation
After installing the pump and the bypass valve,
connect the pump to the power supply and check
the installation as follows:
1. Close the angle stop valve for the cold water
below the sink.
2. Open the cold-water faucet.
3. Check that when you turn on the cold-water
faucet, the flow of cold water gradually
decreases and stops as the bypass valve
closes.
4. Check that when you turn on the hot-water
faucet, hot water will flow within seconds.
5. For troubleshooting, see the section Fault
finding the product.
7. Electrical connection
DANGER
Electric shock
Death or serious personal injury
‐All electrical work must be carried
out by a qualified electrician in
accordance with the latest edition
of the National Electric Code and
state, local codes and regulations.
DANGER
Electric shock
Death or serious personal injury
‐Switch off the power supply before
starting any work on the product.
Make sure that the power
supply cannot be switched on
accidentally.
DANGER
Electric shock
Death or serious personal injury
‐This pump is supplied with a
grounding conductor and
grounding-type attachment plug. To
reduce the risk of electric shock, be
certain that it is connected only to a
properly grounded, grounding-type
receptacle in accordance with the
National Electric Code and any
state, local governing codes and
regulations.
DANGER
Electric shock
Death or serious personal injury
‐If national, state or local legislation
requires a GFCI (Ground Fault
Circuit Interrupter) or equivalent in
the electrical installation, this must
be type A or better, due to the
nature of pulsating DC leakage
current.
A Type-A GFCI is identified by this symbol:
TM072832
The motor is protected by the electronics in the
control box and requires no external motor
protection.
• Check that the supply voltage and
frequency of the installation site correspond
to the values stated on the pump.
• Only connect the pump to the power
supply with the line cord supplied with the
pump.
• Do not modify and only use the line
cord supplied.
13
English (US)

• The POWER on symbol indicates that the
electrical supply has been switched on.
7.1 Connecting the line cord
TM072125
Inserting the line cord plug into the pump (side
view)
To connect the line cord with the pump:
1. Align the line cord plug with the pump.
2. Insert the line cord plug into the pump as
shown.
3. Push the line cord plug into the pump.
7.2 Removing the line cord
1
2
3
TM072126
Removing the line cord plug from the pump
(bottom view)
To remove the line cord from the pump:
1. Insert a 1/8 inch flat blade screwdriver into
the slot.
2. Twist the screwdriver.
3. Pull the cord to remove it.
8. Starting up the product
8.1 Venting the system
WARNING
Hot water
Death or serious personal injury
‐If the hot-water temperature is too
high, it can cause severe burns or
scalding.
‐To prevent burns or scalding, be
sure to limit the temperature of the
hot-water source before you vent
the system.
To vent the system:
1. Turn on the water supply to the hot-water
source.
2. Verify that there are no leaks in any of the
connections.
3. Turn on the tap or faucet furthest from the
hot-water source until there is a steady
stream of water with no evidence of air in the
system.
8.2 Starting the pump
1. Connect the line cord to the power supply to
start the pump.
2. The pump will run for approximately 5
seconds and then stop.
If the water heater system is tankless, check
that the heater turns on when connecting the
power supply to the pump.
3. The green POWER on LED on the pump
display will be lit when the power is on.
Related information
9.1 Pump display
14
English (US)

9. Control functions
9.1 Pump display
123 4
ALPHA 15-55 HWR-D
POWER
on
Intertek
3191277
CM
CUS
TM076454
LED symbols and buttons on the pump display
Pos. Description
1Connect LED
2POWER on LED
3 Pairing button
4Pump operation LED
Pump
display
symbol
Status Explanation
POWER
on Green
The LED lights green
when the pump is
powered on.
Connect Flashing
blue
The LED flashes blue
when the pump is
ready for pairing with
the push-button.
Connect Blue
The LED lights blue for
5 seconds when
pairing is successful
between the pump and
the push-button.
Connect
Flashing
red (5
seconds)
during
installatio
n
The LED flashes red
for 5 seconds when
pairing has failed with
the push-button.
Pump
display
symbol
Status Explanation
Connect
Flashing
red (2
seconds)
during
normal
operation
The LED flashes red
for 2 seconds when
the battery level in
the push-button is at a
critical level.
Replacement of the
batteries in the push-
button is
recommended.
Connect Green
The LED lights green
for 2 seconds when
the push-button is
activated during
normal operation.
Pump
operation Green
The LED lights green
when the pump
circulates water during
normal operation.
Pump
operation Yellow
The LED lights yellow
when the pump has
timed out. The pump
does not circulate
water.
Pump
operation Red
The pump is in an
alarm state (see fault
finding section).
Related information
8.2 Starting the pump
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English (US)

9.2 Push-button LED
LED status Explanation
Flashing blue
The LED flashes blue when the
push-button is ready for pairing
with the pump.
Blue
The LED lights blue for 5
seconds when pairing between
the push-button and the pump
has succeeded.
Flashing red
(5 seconds)
during
installation
The LED flashes red for 5
seconds when pairing between
the push-button and the pump
has failed. Restart of the
installation procedure is
recommended.
Flashing red
(2 seconds)
during normal
operation
The LED flashes red for 2
seconds when the battery level
in the push-button is at a
critical level, and the push-
button is activated.
Replacement of the batteries in
the push-button is
recommended.
Green
The LED lights green for 2
seconds when the push-button
is activated during normal
operation.
9.3 Repeater LED
The LED on the repeater will light green when the
repeater is in operation.
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English (US)

9.4 Performance curve
The pump runs at constant speed and
consequently on a constant curve. The pump is
set on the maximum curve under all operating
conditions.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Q [US GPM]
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
[ft]
H
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
[m]
H
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Q [m³/h]
ALPHA 15-55 HWR-D
60 Hz
Without check valve installed
With check valve installed
TM072501
Performance curve, ALPHA 15-55 HWR-D
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English (US)

10. Servicing the product
10.1 Maintaining the product
The ALPHA HWR-D pump is maintenance-free.
If the pump is damaged, for example with
fractures or dents, replace the pump.
10.1.1 Battery replacement
WARNING
Biological hazard
Death or serious personal injury
‐Keep batteries out of reach of small
children, the elderly, and pets.
Batteries can cause permanent
injury if ingested or placed in the
nose, mouth, or ears.
‐Immediate emergency room
treatment is required for anyone
who ingests a battery. In addition,
in the US, consult the 24-hour
National Battery Ingestion Hotline
at 800-498-8666 for assistance.
CAUTION
Corrosive substance
Moderate to minor personal injury and
risk of property damage
‐The push-button HWR-D must be
replaced if battery leakage occurs.
CAUTION
Flammable material
Minor or moderate personal injury
‐Do not attempt to recharge non-
rechargeable batteries.
To clean the push-button, wipe it with a
clean, damp cloth.
Ensure that disposal of old batteries is in
accordance with local regulations. Recycle old
batteries where possible.
10.1.2 Replacing the battery of the push-
button
The push-button uses AAA 1.5 V
alkaline batteries. To change the battery in the
push-button, follow these steps:
1. Remove the push-button from the mounting
bracket on the back of the push-button.
2. Remove the old batteries.
3. Insert the two new batteries.
4. Replace the push-button on the mounting
bracket.
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English (US)

11. Fault finding the product
11.1 The pump does not start
POWER on LED on the pump control panel is not lit.
Cause
The pump is not connected to the power supply.
Remedy
• Make sure the power supply is switched on.
• Check if external protection has tripped.
• Make sure the cables and connections are free from defects and connected securely.
11.2 The pump does not start
The POWER on LED on the pump control panel is green. The Pump Operation LED is red.
Cause
The pump is in an alarm state.
Remedy
• Contact your local Grundfos representative.
11.3 The pump does not start
The Power On LED on the pump control panel is green, but the pump does not start when the push-
button is activated.
Cause
If the Pump Operation LED on the pump control panel is yellow, the pump has timed out.
Remedy
• Wait until the yellow Pump Operation LED turns off.
Cause
The push-button is not paired with the pump.
Remedy
• Follow the pairing procedure for the push-button.
Cause
The push-button batteries need replacing.
Remedy
• Replace the batteries in the push-button.
Cause
The push-button is out of range.
Remedy
• Use the Repeater HWR-D accessory to increase the range of wireless signals.
11.4 The pump does not start
After installing the repeater, the Power On LED on the pump control panel is green, but the pump does
not start when the push-button is activated.
Cause
The push-button is out of range, and the pump does not receive the repeater's wireless signal.
Remedy
• Relocate the repeater within the house for an optimum range of wireless signals.
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English (US)

11.5 There is a noise in the hydraulic system
There are no indicators lit on the pump or accessories.
Cause
Air in the system
Remedy
• Open a faucet or tap to let trapped air escape.
11.6 There is noise in the circulator pump.
There are no indicators lit on the pump or accessories.
Cause
Air is trapped in the pump.
Remedy
• Open a faucet or tap to let trapped air escape.
Cause
There is no water in the pump
Remedy
• Ensure there is liquid in the hot water supply source.
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English (US)