GRUNDFOS ALPHA Central Heating Pump Instruction Manual

ALPHA
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

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 24 months from date of installation, but not more than 30 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.

General information

Read this document before you install the product.
Installation and operation must comply with local regulations and accepted codes of good practice.
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.

| 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.

Product introduction

3.1 Product description ALPHA 15-58

ALPHA is a high-efficiency circulator fitted with an electronically commutated motor and designed for circulating liquids in heating systems.
The pump features the highest HI energy rating on the market.
ALPHA is designed with intelligent controls featuring constantpressure, proportional-pressure and constant-speed curves, each with three speed settings as well as an AUTOADAPT setting, removing the need to manually select the pump setpoint.
The new toolless, removable power connector results in fast and easy installation. Fewer callbacks can be expected due to its robust startup, self- venting ability and dry-running protection. The system air detection and venting mode can be activated through the Grundfos GO app. Grundfos GO also provides the ability to conveniently troubleshoot the system through the event log, run guided setup, set custom control modes and run firmware updates.
Historical trend data for flow, head, estimated media temperature and on-cycle durations are available through the app.
A terminal box with conduit connections is provided for power connection.
3.2 Intended use
The pump is designed for circulating liquids in heating and air conditioning systems.
3.3 Pumped liquids
WARNING
Electric shock
Death or serious personal injury
‐ For indoor use only.
‐ This pump has not been investigated for use in swimming pool or marine areas.
WARNING
Fire or explosion hazard
Death or serious personal injury
‐ The pump must not be used for the transfer of flammable liquids such as diesel oil, gasoline and similar liquids.
The product is suitable for pumping clean, thin, non-aggressive and non- explosive liquids without solid particles or fibers or mineral oils.
If required, 50 % of the volume solution of glycol and water can be used.
However, a decrease in pump performance may occur due to an increase in the viscosity of the solution.
Contact the manufacturer for information regarding suitability of the pump for pumping other liquids.
The pump is designed to circulate water from 36 to 230 °F (2 to 110 °C) up to a maximum pressure of 175 psi (12 bar).
3.4 Identification
3.4.1 Nameplate

Related information
4.1 Inspecting the product
7. Electrical connection

3.4.2 Type key
Example: ALPHA 15-58 FR 115V 9H

3.5 Approvals 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.

Receiving the product

4.1 Inspecting the product
CAUTION
Crushing of feet
Minor or moderate personal injury
‐ Wear safety shoes when handling the product.
CAUTION
Sharp element
Minor or moderate personal injury
‐ Wear protective gloves.

1. Make sure that the delivered product corresponds to the order.
2. Make sure that the voltage and frequency of the product match the voltage and frequency of the installation site.

Related information
3.4.1 Nameplate
4.2 Scope of delivery
The box contains the following items:

• 1 pump
• 1 power connector
• 2 screws for the conduit box
• 1 check valve
• 1 blanking plug
• 2 gaskets
• 1 quick guide
• 1 safety instructions booklet.

Installation requirements

5.1 Radio frequency radiation exposure information (for Canada and US only) (only for ALPHA)
CAUTION
Radiation
Minor or moderate personal injury
‐ This equipment complies with FCC and ISED radiation exposure limits set forth for an uncontrolled environment. This equipment must be installed and operated with a minimum distance of 20 cm (0.66 ft) between the radiator and your body.
5.2 Optimal installation and operation
See below for information about the installation and setting of the product:

• Slow down the flow to dissipate the heat in the zones faster.
• A small temperature difference between the inlet and outlet of the boiler can cause inefficient boiler performance and in some cases short cycling. Lowering the flow of the circulator can prevent this from happening.
• By having a larger delta T going back to the boiler, the boiler eventually r starts to condense. The efficiency of the boiler and system increases, thereby saving money and wear and tear on your system.
• In order to create a flow in a system, the pump needs to neutralize the system head loss before it can create a flow in the system.
• In case there is too little heat at the far end of the installation, choose a higher setting on the pump or check the hydronic balance of the system. An increase in the boiler supply temperature could also be a solution.
• When mounting the pump, ensure that the shaft is in a horizontal position to avoid air being trapped inside or bearings being worn out too quickly.
• Make sure that you have the proper voltage and that the wires are connected properly (black = phase, white = neutral, green or bare copper = ground).

Related information
6.1 Mounting the product
7.1 Wiring the pump

Mechanical installation

WARNING
Electric shock
Death or serious personal injury
‐ A damaged product must be repaired or replaced by Grundfos or a service workshop authorized by Grundfos.
CAUTION
Crushing of feet
Minor or moderate personal injury
‐ Wear safety shoes when opening the box and handling the product.
CAUTION
Sharp element
Minor or moderate personal injury
‐ Wear protective gloves.
The pump must always be installed with a horizontal motor shaft within ± 5°.
The pump is a non-submersible pump.
Due to interference of the touchscreen, keep a distance of minimum 5 mm from the front of the operating panel to all conductive materials, for example, metal cabinets and cables.
6.1 Mounting the product
The arrows on the pump housing indicate the flow direction through the pump. See the figure below.

1. Fit the two gaskets supplied with the pump when you mount the pump in the pipe.
2. Install the pump with a horizontal motor shaft within ± 5°.
3. Tighten the fittings or flange bolts.

Related information
5.2 Optimal installation and operation
6.2 Changing the control box position
CAUTION
Hot surface
Minor or moderate personal injury
‐ Position the pump so that persons cannot accidentally come into contact with hot surfaces.
WARNING
Pressurized system
Minor or moderate personal injury
‐ Before dismantling the pump, drain the system and close the isolating valves on both sides of the pump. The pumped liquid may be scalding hot and under high pressure.
Make sure that the isolating valves are closed before rotating the control box. The pump must be pressureless before the control box is rotated. Drain the system or relieve the pressure inside the pump housing.
To change the position of the control box, do as follows:

1. Loosen and remove the four screws.
2. Turn the pump head to the desired position.You can turn the control box in steps of 90° if the flanges are in standard position (F) and in steps of 180° if the flanges are in flange rotated position (FR).Flanges in flange rotated position (FR)
3. Insert and cross-tighten the screws.

Electrical connection

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
Electric shock
Death or serious personal injury
‐ Connect the product only to a properly grounded receptacle. See owner’s manual.
WARNING
Electric shock
Death or serious personal injury
‐ All electrical connections must be carried out by a qualified electrician in accordance with local regulations.
WARNING
Electric shock
Death or serious personal injury
‐ Use of the product on a circuit equipment with a GFCI can cause improper operation of the GFCI. Consult an electrician and observe all national, state and local electrical regulations, as applicable.

• The pump is electronically protected and therefore requires no external motor protection.
• Check that the supply voltage and frequency correspond to the values stated on the nameplate.
• Connect the pump to the power supply with the power connector supplied with the pump.

Related information
3.4.1 Nameplate

7.1 Wiring the pump
Note that the conduit connector and conduit are not supplied by Grundfos.
Follow the steps below to wire the pump:

1. Remove the lid from the conduit box, attach the conduit connector to the knockout opening and tighten the connector nut.
   Use only a flexible conduit.

2. Take the power connector and lift the orange levers, and connect the black wire to L (phase), the white wire to N (neutral), and the green wire to ****(ground). The power connector can be fitted with AWG 20 AWG 12 wires.

3. Press the orange levers down to tighten the wires.

4. Insert the power connector.

5. Mount the cover on the conduit box.

Related information
5.2 Optimal installation and operation
11.1.1 Disconnecting the wires

Starting up the product

CAUTION
Radiation
Minor or moderate personal injury
‐ This equipment complies with FCC and ISED radiation exposure limits set forth for an uncontrolled environment. This equipment must be installed and operated with a minimum distance of 20 cm (0.66 ft) between the radiator and your body.

1. Fill the system with liquid and vent it.
2. Make sure the required minimum inlet pressure is available at the pump inlet.
3. Switch on the power supply.

The pump is factory set to constant curve (zone pump), AUTOADAPT.
You can change the settings on the operating panel or via Grundfos GO. We recommend to follow the guided setup in Grundfos GO.

Related information
8.1 Venting the pump
10.2 Guided setup
8.1 Venting the pump Small air pockets trapped inside the pump may cause noise when starting up the pump. However, because the pump is self- venting through the system, the noise ceases over a period of time. Still, we recommend venting the pump in new installations or when the pipes have been emptied and refilled with water. You can vent the pump via Grundfos GO.

• If you follow the guided setup, you are asked if you want to vent the pump now.
• If you do not follow the guided setup, you can access the venting settings via the Settings menu.

The pump must not run dry.
You cannot vent the system through the pump.
Related information
8. Starting up the product
10.2 Guided setup
10.3 Air detection and system venting
8.2 Dry-running protection
The dry-running protection protects the pump against dry running during startup and normal operation.
During startup
If water has not been detected, the pump rotates the impeller back and forward. If water is still not detected, it attempts again after 30 seconds.
The pump stops after maximum 30 attempts, and the spinner icon on the operating panel is spinning (temporary mode).
During normal operation
If dry running is detected during normal operation, the pump stops for 30 minutes and attempts again. After 144 attempts, the pump stops in alarm mode, Grundfos mini Eye flashes red and error code E4 is displayed.
The pump can be restarted by pressing anywhere on the operating panel (except the connect and lock icons). The pump will not detect dry running if dry running has been detected during the past 25 hours. If the pump has previously detected water, the pump can sustain 25 hours of dry-running operation.
Related information
9.2 Light fields indication
12.8.8 Code 57 (Dry running)

Control functions

9.1 Operating pane l
LED symbols and buttons on the pump display

The indicator light shows the operating status of the product.
2| Connect
If lit, the pump is connected to Grundfos GO via Bluetooth.
3| Settings for control modes
Use the arrows to toggle between I, II, III and AUTOADAPT.
4| Control mode
You can select the control mode constant pressure (zone valve) or constant curve (zone pump).
5| Unit
The indicator light shows the unit used for the number to the left. W = Watt, ft = feet and GPM = gallons per minute.
6| Lock
This indicates that the operating panel is locked and no buttons can be used. It automatically locks after a few seconds. To unlock the panel, push and hold the icon for 1 second.
7| Settings for the selected control mode
I, II, III or AUTOADAPT
8| Grundfos GO
The pump has been set via Grundfos GO.
9| The light field indicates:
• Power consumption [W] • Head [ft] • Flow rate [gpm] • Spinner
• Error code.

The operating panel has a touchscreen which means you can change settings by touching the icons on the operating panel.
Due to interference of the touchscreen, keep a distance of minimum 5 mm from the front of the operating panel to all conductive materials, for example, metal cabinets and cables.
Related information
9.2 Light fields indication
9.3.1 Constant curve (zone pump)
9.3.2 Constant curve (zone pump), AUTOADAPT
9.3.3 Constant pressure (zone valve)
9.3.4 Constant pressure (zone valve), AUTOADAPT
9.2 Light fields indication
The LEDs indicate the control mode, setting and operating status.
Factory setting
The pump is factory set to constant curve (zone pump), AUTOADAPT.

GO, the icon is lit and the modes and settings on the operating panel are turned off.
| Constant pressure (zone valve)
| Constant curve (zone pump)
| Setting I
| Setting II
| Setting III
| The pump is running. 1
| Warning 1
| Alarm
| Spinner
The pump is unavailable for changes to settings. The pump is still running.
The spinner icon appears during software update and dry running.

1 The rotation of Grundfos mini Eye follows the direction of rotation of the impeller. The impeller in ALPHA rotates counterclockwise.
Related information
8.2 Dry-running protection
9.1 Operating panel

9.3 Control modes
ALPHA can be set to following control modes:

• Constant curve (zone pump)
• Constant pressure (zone valve )
• Proportional pressure (thermostatic radiator valve)
• Constant flow.

All control modes except constant flow can be set to pump setting I, II, III or AUTOADAPT.
All control modes in Grundfos GO. Only constant-curve (zone pump) and constant-pressure (zone valve) control modes can be set on the operating panel.
9.3.1 Constant curve (zone pump)
In the constant-curve (zone pump) mode, the pump runs at a constant curve, which means that it runs at constant speed or power. The pump performance follows the selected constant curve.
This control mode is especially suitable in applications where the characteristics of the heating system are steady, and the emitters require a constant flow. The selection of the constant-curve setting depends on the characteristics of the heating system and the actual required flow and heat demand. Related information
9.1 Operating panel
10.8 Settings according to system type

9.3.2 Constant curve (zone pump), AUTOADAPT
The constant curve (zone pump) AUTOADAPT setting ensures a balance between the minimum energy consumption of the pump and the maximum level of resident comfort.
This setting is designed for zone pump systems where the flow rate remains stable throughout the year compared to zone valve systems or systems with TRVs.

When the pump is set to constant curve (zone pump), AUTOADAPT, the pump starts at a constant curve setting I every time the pump is turned on. If the zone or room thermostat has not turned the pump off after an extended operating period, the pump assumes there is not enough flow and ramps up the speed until it reaches the maximum performance curve. It maintains this setting until the pump is switched off by the room or zone thermostat. This is repeated every time the pump is turned on.
Related information
9.1 Operating panel

9.3.3 Constant pressure (zone valve)
In the constant-pressure (zone valve) mode the pump runs at constant pressure which means the head (pressure difference) is kept constant, irrespective of the actual number of opened zones. The pump performance follows the selected constant-pressure curve. This control mode is especially suitable for underfloor heating and applications where the pump is used to supply a common header for multiple zone valves. The head across each zone will remain constant independent of how many zones request heat, thus a constant flow in each zone will be maintained, independent of other zones.
The selection of the constant-pressure setting depends on the characteristics of the zones in the heating system and the actual heat demand. Related information
9.1 Operating panel
10.8 Settings according to system type

9.3.4 Constant pressure (zone valve), AUTOADAPT
With the constant pressure (zone valve) AUTOADAPT setting, the pump analyses the heating system and over time selects the best constant-pressure setpoint for the given operating conditions. It continuously optimizes the position of the constant-pressure curve via three steps:

1. The pump analyses the heat demand patterns of the heating system.
2. AUTOADAPT verifies whether the pump pressure is too high, too low or suitable.
3. The pump adjusts the setpoint and chooses the best suitable constant-pressure curve from the AUTOADAPT range. The pump will continue this cycle as long as it is running. See the figure below.

If the power supply fails or is disconnected, the pump stores the AUTOADAPT setting in an internal memory and resumes the automatic adjustment when power supply has been restored.
Related information
9.1 Operating panel
9.3.5 Proportional pressure (thermostatic radiator valve (TRV))
In the proportional-pressure (thermostatic radiator valve (TRV)) mode, the pump runs at proportional pressure, which means the head (pressure) is reduced at falling heat demand and increased at rising heat demand. The pump performance follows the selected proportional-pressure curve. This control mode is especially suitable for applications where the heat emitters are equipped with a TRV which controls the flow depending on the room temperature.
At increased flow, the losses in the distribution system (pipes and fittings) increase, hence the pumps increase the pressure to compensate and vice versa, hereby maintaining an almost constant differential pressure across the thermostatic radiator valve.
The proportional-pressure mode setpoint depends on the heating system’s characteristics and the actual heat demand.

Related information
10.8 Settings according to system type

9.3.6 Proportional pressure (thermostatic radiator valve (TRV)), AUTOADAPT
The thermostatic radiator valve (proportional pressure)
AUTOADAPT setting analyses the heating system and over time selects the best proportional pressure setpoint under the given operating conditions. It continuously optimizes the position of the constant-pressure curve via three steps:

1. The pump analyses the heat demand patterns of the heating seating.
2. AUTOADAPT verifies whether the pump pressure is too high, too low or suitable.
3. The pump adjusts the setpoint and chooses the best suitable proportional-pressure curve from the AUTOADAPT range. The pump will continue this cycle as long as it is running. See the figure below.

If the power supply fails or is disconnected, the pump stores the AUTOADAPT setting in an internal memory and resumes the automatic adjustment when power supply has been restored.
9.3.7 Constant flow
In this control mode, the pump maintains a constant flow in the system independently of the head.We recommend that you select this control mode if you know the desired flow rate to the system.
This control mode is recommended for the following applications:

• Zone pump
• Boiler pump
• Tank pump.

Related information
10.8 Settings according to system type

Setting of the product

CAUTION
Radiation
Minor or moderate personal injury
‐ This equipment complies with FCC and ISED radiation exposure limits set forth for an uncontrolled environment. This equipment must be installed and operated with a minimum distance of 20 cm (0.66 ft) between the radiator and your body.
The operating panel can be used for the following:

• Connect to Grundfos GO.
• Lock and unlock the operating panel.
• Select constant pressure (zone valve) or constant curve (zone pump) control mode.
• Select pump setting (I, II, III or AUTOADAPT) for the two control modes available on the operating panel.
• Select to operate with Grundfos GO settings.
• In Grundfos GO you can access all settings.

10.1 Connecting the product to Grundfos GO
Before connecting the product to Grundfos GO, the Grundfos GO app must be downloaded to your smartphone or tablet. The app is free of charge and available for iOS and Android devices.
The connection can be started either from the operating panel or Grundfos GO. If you have several products installed, we recommend starting the connection from the operating panel.

1. Open Grundfos GO on your device. Make sure that Bluetooth is enabled.
   Your device must be within reach of the product to establish Bluetooth connection.

2. Go to the Remote menu in Grundfos GO.

3. Press the connect icon on the operating panel.
   The connect icon flashes until your device is connected.

4. Press CONNECT in the top bar in Grundfos GO next to the message ALPHA wants to connect.
   Once the connection is established, the LED is permanently on.
   Grundfos GO is now loading the data for the product.

10.2 Guided setup
After the pump is connected to Grundfos GO, we recommend that you follow the guided setup in Grundfos GO.
The guided setup helps you to select the optimal settings for the current system. By choosing the optimal settings, you can lower the energy consumption and prevent potential noise problems.
If you select Use default settings, the pump uses the factory setting, constant curve (zone pump), AUTOADAPT.
Related information
8. Starting up the product
8.1 Venting the pump
10.3 Air detection and system venting
ALPHA offers a Continuous air detection and venting feature which means the pump can detect air and push it quickly to the system vent.
If the pump detects air, it runs a venting sequence which enables more air to escape compared to letting the pump run at maximum speed during the entire process.
During system venting, the air is pushed to the system vent.
The function can be enabled in Grundfos GO in the Settings menu.
During the guided setup, you are asked if you want to vent the pump and system now. This is only a single event, and it will not enable this function.
Related information
8.1 Venting the pump
10.4 Flow limitation
You can set a minimum and maximum flow rate in Grundfos GO.
A minimum flow limit can be set to prevent the boiler from overheating. A maximum flow limit can be set to prevent noise in the system.
10.5 Trend data
In the Trend data menu in Grundfos GO, you can see system data for the last 10 or 100 on-cycles. An on-cycle is the period from when the pump turns on until it turns off. If the pump runs continuously for more than 24 hours, one on- cycle is registered and a new on-cycle will start even though the pump has not yet turned off. The 100 cycles view consists of 10 observations where each observation is the average of 10 on-cycles.
You can see the following data:

• Duration of each on-cycle
• Flow
• Head
• Estimated media temperature.

You can use the trend data for system optimization and fault finding.
10.6 Updating the firmware

1. Make sure your smart device has sufficient power.

2. Make sure your smart device is connected to the internet.
   If there is no internet where the pump is installed, go to step 3 and then follow the instructions in Grundfos GO.

3. Connect your product to Grundfos GO if it is not already connected.
   Once connected to Grundfos GO, the app automatically checks if the product has the latest firmware installed. If a newer version is available, a red dot in Settings menu will appear in Grundfos GO with the text Firmware update available.

4. Follow the guide in Grundfos GO to install the firmware update.

10.7 Resetting to factory settings
The product can be reset to factory settings in two ways:

• Via Grundfos GO
  1. Open Grundfos GO.
  2. Press the gear icon in the top right side of the screen.
  3. Go to the Factory reset menu and press Reset.

• Via the operating panel
  1. Press and hold the unit icon for 5 seconds.

10.8 Settings according to system type

Zone pump system

| Constant curve (zone pump)
Constant flow if you know the design flow of the system.
Zone valve system| Constant pressure (zone valve)
TRV system| Proportional pressure (TRV)
Underfloor heating with actuators| Constant pressure (zone valve)
Boiler pump| Constant curve (zone pump)
Constant flow if you know the design flow of the system.
Pump for indirect tank| Constant curve (zone pump)
Constant flow if you know the design flow of the system.
Primary pump| Constant curve (zone pump)
Constant flow if you know the design flow of the system.

Related information
9.3.1 Constant curve (zone pump)
9.3.3 Constant pressure (zone valve)
9.3.5 Proportional pressure (thermostatic radiator valve (TRV))
9.3.7 Constant flow

Service

WARNING
Electric shock
Death or serious personal injury
‐ All electrical connections must be carried out by a qualified electrician in accordance with local regulations.
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
Electric shock
Death or serious personal injury
‐ A damaged product must be repaired or replaced by Grundfos or a service workshop authorized by Grundfos.
WARNING
Electric shock
Death or serious personal injury
‐ Connect the product only to a properly grounded receptacle. See owner’s manual.
WARNING
Pressurized system
Minor or moderate personal injury
‐ Before dismantling the pump, drain the system or close the isolating valves on both sides of the pump. Slowly loosen the screws and unpressurize the system. The pumped liquid may be scalding hot and under high pressure.
WARNING
Hot surface
Minor or moderate personal injury
‐ The pump housing may be hot due to the pumped liquid being scalding hot. Close the isolating valves on both sides of the pump and wait for the pump housing to cool down.
CAUTION
Sharp element
Minor or moderate personal injury
‐ Wear protective gloves.
CAUTION
Crushing of feet
Minor or moderate personal injury
‐ Wear safety shoes when moving the product.
CAUTION
Radiation
Minor or moderate personal injury
‐ This equipment complies with FCC and ISED radiation exposure limits set forth for an uncontrolled environment. This equipment must be installed and operated with a minimum distance of 20 cm (0.66 ft) between the radiator and your body.
11.1 Dismantling the product
Follow the steps below to dismantle the product:

1. Switch off the power supply.
2. Close the inlet and outlet valves.
3. Remove the lid from the conduit box.
4. Pull out the power connector and disconnect the wires from the power connector.
5. Loosen and remove the conduit.
6. Loosen and remove the bolts from the pump flanges.
7. Remove the pump from the system.

Related information
11.1.1 Disconnecting the wires
11.1.1 Disconnecting the wires
Follow the steps below:

1. Switch off the power supply.
2. Remove the lid from the conduit box.
3. Loosen the conduit.
4. Lift the orange levers to loosen the wires.
5. Pull the conduit out of the conduit box.

Related information
7.1 Wiring the pump
11.1 Dismantling the product

Fault finding

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
Electric shock
Death or serious personal injury
‐ A damaged product must be repaired or replaced by Grundfos or a service workshop authorized by Grundfos.
WARNING
Hot surface
Minor or moderate personal injury
‐ The pump housing may be hot due to the pumped liquid being scalding hot. Close the isolating valves on both sides of the pump and wait for the pump housing to cool down.
CAUTION
Pressurized system
Minor or moderate personal injury
‐ Before dismantling the pump, drain the system or close the isolating valves on both sides of the pump. The pumped liquid may be scalding hot and under high pressure.
CAUTION
Radiation
Minor or moderate personal injury
‐ This equipment complies with FCC and ISED radiation exposure limits set forth for an uncontrolled environment. This equipment must be installed and operated with a minimum distance of 20 cm (0.66 ft) between the radiator and your body.

12.1 Fault indication on the pump operating panel
Faults preventing the pump from operating properly are indicated on the operating panel with Grundfos mini Eye turning either yellow or red and the display showing an error code.
A warning is indicated when one indicator light in Grundfos mini Eye is turning yellow and rotating. The pump does not perform as expected, and action is required in case of underheating or discomfort.
An alarm is indicated when two indicator lights in Grundfos mini Eye are flashing red and the pump stops. Action is required.

12.2 Overview of alarm and warning codes
Fault chart

• This error is not shown on the operating panel. It is logged and can be seen in Grundfos GO.
  12.3 Resetting alarms and warnings manually with Grundfos GO

  1. Go to Alarms and warnings.

  2. Press Reset alarm.
     All current alarms and warnings have been reset. However, if the fault causing the alarm or warning has not been removed, the alarm or warning will appear again.

  3. If you want to delete all alarms and warnings from the history log, press Show log > Reset alarm and warning logs.

12.4 Alarm and warning code logs
Grundfos GO will save up to 40 alarms and warnings in total in the Alarms and warnings menu.
12.5 Automatic deblocking
In case of a blocked rotor, the pump will start vibrating automatically with a frequency of around 3 Hz during startup. Any dirt deposits that might prevent the impeller from rotating will be broken up swiftly, and the pump will resume normal operation.
Related information
12.8.1 Code 51 (Blocked pump)
12.6 Overheated boiler

12.7 Noise in the system

12.8 Alarms
12.8.1 Code 51 (Blocked pump)
Grundfos mini Eye is flashing red, the displays show error code E1 and the pump stops.

1. Isolate the pump.
2. Remove the pump head.
3. Remove the deposits.

Related information
12.5 Automatic deblocking

12.8.2 Code 40 (Undervoltage)
Grundfos mini Eye is flashing red, the displays show error code E2 and the pump stops.

is within the specified range.

12.8.3 Code 29 (Forced pumping)
Grundfos mini Eye is flashing red, the displays show error code E3 and the pump stops.

Other pumps or sources generate flow through the pump even if the pump is switched off.| • Switch off the pump at the main switch. If the light in the pump display is on, the pump
is running in forced pumping mode.
• Check the system for the correct position of the nonreturn valves.
• Check the system for defective non-return valves and replace the valves if necessary.

12.8.4 Code 74 (Overvoltage)
Grundfos mini Eye is flashing red, the displays show error code E3 and the pump stops.

is within the specified range.

12.8.5 Code 72 (Internal fault)
Grundfos mini Eye is flashing red, the displays show error code E3 and the pump stops.

way according to local
regulations, or contact Grundfos Service.

12.8.6 Code 76 (Internal fault)
Grundfos mini Eye is flashing red, the displays show error code E3 and the pump stops.

way according to local
regulations, or contact Grundfos Service.

12.8.7 Code 85 (Internal fault)
Grundfos mini Eye is flashing red, the displays show error code E3 and the pump stops.

way according to local
regulations, or contact Grundfos Service.

12.8.8 Code 57 (Dry running)
Grundfos mini Eye is flashing red, the displays show error code E4 and the pump stops.

system with the correct amount of liquid.
• Prime and vent the pump before a new startup.

Related information
8.2 Dry-running protection

12.9 Warnings
12.9.1 Code 43 (Impellers forced forward)
One indicator light in Grundfos mini Eye is yellow and rotating, the display shows error code E3 and the pump is running.

Other pumps or sources generate flow through the pump even if the pump is switched off.| • Switch off the pump at the main switch. If the light in the pump display is on, the pump
is running in forced pumping mode.
• Check the system for the correct position of the nonreturn valves.
• Check the system for defective non-return valves and replace the valves if necessary.

12.9.2 Code 35 (Air in media)
This is not shown on the operating panel. It is logged and can be seen in Grundfos GO.

• If the problem persists, investigate the system for leakages.

 Technical data

Max.: 38 W
Enclosure class| Indoor use only. Enclosure type 2.
Insulation class| F
Ambient temperature| 32-131 °F (0-55 °C)
Liquid temperature| 36-230 °F (2-110 °C)
Relative humidity| Max. 95 %
Max. outlet pressure| 175 psi (12 bars) (1.2 MPa)
Check valve| Use of a check valve reduces pump hydraulic performance.
Sound pressure level| < 25 dB(A)
Approvals| cULus and FCC.
Complies to limits for class B digital device, pursuant to Part 15 of the FCC Rules.
Flange-to-flange length| 6.5″ (165 mm)
Pump housing| Electrocoated cast iron
Connection type| Flanged connection

The dew point of the air at ambient temperature must always be lower than the liquid temperature, otherwise condensation may form in the stator housing.
Inlet pressure

Disposing of the product

This product or parts of it must be disposed of in an environmentally sound way.

1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest Grundfos company or service workshop.

See also end-of-life information at www.grundfos.com/productrecycling.

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U.S.A.
Global Headquarters for WU
856 Koomey Road
Brookshire, Texas 77423 USA
Phone: +1-630-236-5500
GRUNDFOS CBS Inc.
902 Koomey Road
Brookshire, TX 77423 USA
Phone: 281-994-2700
Toll Free: 1-800-955-5847
Fax: 1-800-945-4777
GRUNDFOS Pumps Corporation
9300 Loiret Boulevard
Lenexa, Kansas 66219 USA
Tel.: +1 913 227 3400
Fax: +1 913 227 3500
Canada
GRUNDFOS Canada inc.
2941 Brighton Road Oakville, Ontario L6H 6C9
Tel.: +1-905 829 9533
Fax: +1-905 829 9512
Mexico
Bombas GRUNDFOS de México S.A. de C.V.
Boulevard TLC No. 15
Parque industrial Stiva Aeropuerto
Apodaca, N.L. 66600
Tel.: +52-81-8144 4000
Fax: +52-81-8144 4010
Revision Info
Last revised on 04-2021

Trademarks displayed in this material, including but not limited to Grundfos and the Grundfos logo, are registered trademarks owned by The Grundfos Group.
© 2022 Grundfos Holding A/S, all rights reserved.

92795808 12.2022
ECM: 1354261
www.grundfos.com

References

• Grundfos | Water is and has always been at the heart and soul of Grundfos. Our promise to the world is to respect, protect, and advance the flow of water.
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