GRUNDFOS COMFORT10-16 Re Circulation Pump Installation Guide

: September 21, 2024
: GRUNDFOS

GRUNDFOS COMFORT10-16 Re Circulation Pump Installation Guide

Installation and operating instructions

General information

This appliance can be used by children aged from 8 years and above and persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge if they have been given supervision or instruction concerning use of the appliance in a safe way and understand the hazards involved.
Children shall not play with the appliance. Cleaning and user maintenance shall not be made by children without supervision.

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

Hazard statements
The symbols and hazard statements below may appear in Grunions 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.

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.

Symbols 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.

Pumped liquids

The product is suitable for domestic hot water with unrestricted water hardness.
The kinematic viscosity of water is 1 mm2/s (1 cSt) at 68 °F (20 °C). If the pump is used for a liquid with a higher viscosity, the hydraulic performance of the pump will be reduced.

Example: 50 % glycol at 68 °F (20 °C) means a viscosity of approximately 10 mm2/s (10 cSt), reducing pump performance by approximately 15 %. When selecting a pump, the viscosity of the pumped liquid must be taken into account.

Receiving the product

Inspecting the product

CAUTION
Crushing of feet
Minor or moderate personal injury

* Wear safety shoes when handling 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.

Mechanical installation

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

All electrical connections must be carried out by a qualified electrician in accordance with local regulations.

WARNING
Pressurised system
Death or serious personal injury

Before installation of 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.

Applications

COMFORT pumps are designed for use in domestic hot-water systems. The pumps are suitable for open and closed systems.

Location

The pump is designed for indoor use in a non-aggressive and non-explosive atmosphere.

Preparing the product for installation

The product has integrated power cable, check valves and isolating valves.

Before installing the product, observe the following:

Flush the system of debris before installation.
Refer to the arrows on the pump housing indicating the direction of the liquid flow through the pump.
See below for correct installation positions.

Mounting the product

WARNING
Pressurised system
Death or serious personal injury

* Tighten the union nuts before opening the isolating valves. The pumped liquid may be scalding hot and under high pressure.

The arrows on the pump housing indicate the flow direction through the pump.

Close the isolating valves and make sure that the system is not pressurised during the installation of the pump.
Mount the pump with gaskets in the pipes.
Tighten the fittings.
Connect the plug to the socket, and switch on the pump. Note that the pump is double insulated and does not require ground connection.

Do not switch on the pump until the system has been filled with liquid and vented.

Installing the temperature sensor (COMFORT TA)

The attached external temperature sensor must be installed in the system in order to use the AUTO ADAPT and temperature control mode.

Do as follows:

Turn the face plate counterclockwise on the pump to release the sensor cable.
Gently unfold the sensor cable to the desired length. Do not pull the cable downwards.
The maximum cable length is 8 ft (2.5 m).
Install the temperature sensor on the pipes on the hot-water outlet side (supply pipe).
The sensor must be installed 8 to 20 inches (20 to 50 cm) (A) from the heat source and can be installed maximum 8 ft (2.5 m) (B) from the pump.

Changing the pump head position

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
Hot surface
Death or serious personal injury

At high liquid temperatures, the product may become so hot that only the operating panel must be touched to avoid burns. Close the isolating valves on all sides of the product and then drain it. Wear protective gloves.

To change the orientation of the pump head, do as follows:

Use a wrench to loosen the union.
Carefully turn the pump head to the desired position and tighten the union (max. 20 Nm). Open the isolating valves.

Startup

WARNING
Hot surface
Death or serious personal injury

At high liquid temperatures, the product may become so hot that only the operating panel must be touched to avoid burns.

WARNING
Electric shock
Death or serious personal injury

Clean only the product with a dry cloth.

Control functions

COMFORT TA

Operating panel

Pos	Description
1	AUTO ADAPT mode.

The LED is permanently green when the pump operates in this control mode. It flashes green when the pump waits for the next predicted operating period or water to cool down.
2| Continuous 24/7 mode.
The LED is permanently green when the pump operates.
3| Warning LED.
The LED is permanently yellow when the external or internal temperature sensor is defect and the pump is in AUTO ADAPT or temperature mode.
4| Arrow button for changing control mode
5| QR code.
Scan the QR code for access to additional product information and documentation.

AUTOADAPT control mode

The pump learns usage patterns throughout the day and ensures hot water is available only when needed via an external sensor on the supply pipe. During the first two to three weeks after installation, the pump frequently starts based on temperature control to ensure immediate comfort until usage pattern has been learned. The pump will despite usage patterns still provide instant comfort when it detects demand for hot water.

After 24 hours of inactivity, the pump automatically enters vacation mode and resumes operation when it detects demand for hot water.

Once a week, the pump runs a 15 minute disinfection cycle. The water heater must enable that function once a week.

Temperature control mode

Comfort is ensured via an external and internal sensor for more accurate water temperature measurement. The pump can automatically adjust on/off temperatures based on the maximum temperature measured in the system. For example, if the maximum water temperature is measured at 113 °F (45 °C), the pump switches off at temperatures above 106 °F (41 °C) and switches back on when the water cools down to below 100 °F (38 °C).

After 24 hours of inactivity, the pump automatically enters vacation mode and resumes operation when it detects demand for hot water.

Continuous 24/7 control mode

The pump operates continuously 24 hours per day.

COMFORT TDT

Operating panel

Pos	Description
1	Arrow button for changing control mode.
2	Temperature mode.

The LED is permanently green when temperature mode is enabled.
3| Setting mode.
It lights up when the actual time and operating time can be set
4| Operating time LEDs.
These LEDs indicate the pump’s operating periods. One LED equals an interval of 30 minutes. When setting the operating time, the applicable LEDs flash green.
5| Change button for changing the actual time and operating times when in setting mode.
6| Actual time.
One LED equals an interval of 30 minutes. The LED is permanently on when set. It flashes yellow when not set.
7| OK button for confirming, changing or deleting settings.
8| Timer mode.
When lit, the LED indicates that the timer mode is activated.
9| Pump operation LED.
It indicates that the pump is operating
10| QR code.
Scan the QR code for access to additional product information and documentation.

Timer control mode

The pump operates continuously based on set operating times.
In case of a power failure, the time pauses with no power reserve. However, the selected operating times and actual time are retained. When power is restored, the pump resumes its last set operating state. If the power outage exceeds 15 minutes, the actual time may need to be reset.

Timer and temperature control mode

The pump operates based on set operating times and temperature mode.
Temperature mode is therefore only enabled during the set operating times.
Comfort is ensured via an internal sensor for more accurate water temperature measurement. The pump can automatically adjust on/off temperatures based on the maximum temperature measured in the system. For example, if the maximum water temperature is measured at 113 °F (45 °C), the pump switches off at temperatures above 106 °F (41 °C) and switches back on when the water cools down to below 100 °F (38 °C).

The maximum temperature of the system is measured every 12 hours, enabling dynamic adjustment of the on/off temperature.

COMFORT T

Operating panel

Pos	Description
1	Temperature mode

The LED is permanently green when temperature mode is enabled
2| QR code
Scan the QR code for access to additional product information and documentation.

Temperature control mode

Comfort is ensured via an internal sensor for more accurate water temperature measurement. This control mode enables the pump to automatically adjust on/off temperatures based on the maximum temperature measured in the system. For example, if the maximum water temperature is measured at 113 °F (45 °C), the pump switches off at temperatures above 106 °F (41 °C) and switches back on when the water cools down to below 100 °F (38 °C).

The maximum temperature of the system is measured every 12 hours, enabling dynamic adjustment of the on/off temperature.

Setting the product

For information on how to set the product and more, scan the below QR code applicable for your variant.

COMFORT TA

COMFORT TDT

COMFORT T

Servicing and dismantling the product

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

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

All electrical connections must be carried out by a qualified electrician in accordance with local regulations.

WARNING
Electric shock
Death or serious personal injury

Excessive use of water when cleaning the product may cause the product to short circuit.

WARNING
Pressurised system
Death or serious personal injury

Drain the system or close the isolating valve on either side of the pump before you do any work on the product. The pumped liquid may be scalding hot and under high pressure. Wear protective gloves and glasses.

WARNING
Hot surface
Death or serious personal injury

At high liquid temperatures, the product may become so hot that only the operating panel must be touched to avoid burns. Close the isolating valves on all sides of the product and wait for the product to cool down before working on it.

WARNING
Hot liquid
Death or serious personal injury

The pumped liquid may be scalding hot and under high pressure. Close the isolating valves on all sides of the product and then drain it.

CAUTION
Crushing of feet
Minor or moderate personal injury

Wear safety shoes when handling the product.

Fault finding

General faults and errors

The pump is not running
The pump has stopped operating and no LEDs are lit

Cause	Remedy
The power supply has been interrupted.

Restore the electrical connection.

The rotor is blocked by deposits or foreign bodies.|

Clean the parts that are in direct contact with water.

A rotor bearing is either worn or faulty.|

Replace the motor.

There is air in the re circulation system.|

Vent the circulation pipe.

The motor is faulty|

Replace the motor.

Constant supply of hot water but the pump is not running

Cause	Remedy
There is air in the pump, and dry running protection is active.

Vent the circulation pipe.

Noisy pump

Cause	Remedy
There is air in the pump housing, and dry-running protection is active.

Vent the circulation pipe.

The rotor bearing is worn or faulty|

Replace the motor

The non-return valve in the system is faulty|

Replace the non-return valve

The motor is faulty.|

Replace the motor.

COMFORT TA

The pump is not running, and the LEDs are flashing

Cause	Remedy
There may be several reasons for this:

Check the current control mode.

The pump is waiting for water to cool down in order to start again.
The pump is in vacation mode (no water usage detected).
There is no predicted hot water demand.|

Wait until next pump start or run hot water through a tap

The warning LED is permanently yellow while in AUTO ADAPT mode

Cause	Remedy
The external sensor cable has been interrupted or the sensor is defect.	The

pump automatically switches to temperature mode and continues operation using the internal sensor.
The internal sensor is defect.| The pump automatically switches to continuous 24/7 mode and continues operation.

The warning LED is permanently yellow while in temperature mode

Cause	Remedy
The external sensor cable has been interrupted or the sensor is defect.	The

pump automatically switches to temperature mode and continues operation using the internal sensor.
The internal sensor is defect| The pump automatically switches to continuous 24/7 mode and continues operation.

The pump is not learning usage patterns, insufficient hot water is supplied

Cause	Remedy
The external sensor is not installed on the hot water supply pipe.

Install the external sensor on the hot-water supply pipe and not on, for example, fittings or tee joints.

The external sensor is installed on insulation.|

Ensure that the external sensor is installed directly on the hot-water supply pipe.

The external sensor is installed at an incorrect distance from the water heater.|

Ensure that the sensor is installed at the correct distance.

There is no hydraulic balancing in the branches of the pipe system.|

Perform hydraulic balancing and fit regulating valves.

The temperature of the water is too low (< 120 °F (48 °C))|

Set the temperature of the water heater to at least 120 °F (48 °C).

The pump is installed too close to the water heater.|

Ensure the pump is installed at the correct distance of the water heater (min. 20 inches (50 cm)).

COMFORT TDT

The pump is not running, and the LED for pump operation is inactive

Cause	Remedy
Timer mode does not start the pump.

Check that the control mode has been set correctly.
Wait for next operating time period for next pump start.
Change operating time settings

Temperature mode does not start the pump|

Wait for the water temperature to cool down.

The actual time LED is flashing yellow

Cause	Remedy
The power supply has been interrupted.

Set the actual time again, if necessary, and press confirm.

Technical data

Liquid temperature 35-176 °F (2-80 °C)
Ambient temperature 32-104 °F (0-40 °C ) 1)
Relative humidity Max 95 %
Max. system pressure
(PN 10) 145 psi (1.0 MPa / 10 bar)
Min. inlet pressure 0.75 psi (0.05 bar)
Max. head 3.4 ft (1 m) 2)
Max. flow rate 2.2 gpm (0.5 m3/h) 2)
Min. power consumption 5 W
Sound pressure level < 22 dB(A)
Max. power consumption 7 W
Pump housing EcoBrass
Lead content < 0.2 %
Port-to-port length 4 3/8″ (110 mm)
Connection type 1 1/4″ NPSM
Enclosure class 2
Appliance class Double insulated
Overvoltage category
(OVC) II
Pollution degree 2