GRUNDFOS Comfort System Hot Water Recirculation System Instruction Manual

: June 10, 2024
: GRUNDFOS

Table of Contents

GRUNDFOS Comfort System Hot Water Recirculation System
Installation and operating instructions
Limited warranty
General information
Receiving the product
Installing the product
Starting up the product
Product introduction
- Intended use
Servicing the product
Fault finding the product
Technical data
Disposing of the product
References
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Download This Manual (PDF format)

GRUNDFOS Comfort System Hot Water Recirculation System

GRUNDFOS-Comfort-System-Hot-Water-Recirculation-System-
PRODUCT

Installation and operating instructions

Original installation and operating instructions
These installation and operating instructions describe Grundfos Comfort System. Sections 1-5 give the information necessary to be able to unpack, install and start up theproduct in a safe way. Sections 6-10 give important information about the product, as well as information on service, fault finding and disposal of the product.

Read this document before installing the product. Installation and operation must comply with local regulations and accepted codes of good practice.
Successful operation depends on careful attention to the procedures described in this manual. Keep this manual for future use.

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 the date of installation, but not more than 36 months from the 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, accidents, 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

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 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.
A blue or grey circle with a white graphical symbol indicates that an action must be taken.
A red or grey 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.

Receiving the product

Inspecting the product
Check that the product received is in accordance with the order. Check that the voltage and frequency of the product match the voltage and frequency of the installation site. See section 6.3 Identification for information on the nameplate. Examine the product to make sure no damage has occurred during shipment. Ensure the pump is not dropped or mishandled. Dropping the pump will damage it.

Scope of delivery
The box contains the following items:

One Grundfos UP15 circulator with 24-hour timer and line cord
one under-sink, bypass valve
two valve mounting screws
two flex hoses, 1/2″ FNPS x 1/2″ FNPS x 12″
installation and operating instructions.

Installing the product

WARNING

Hot water Serious to moderate personal injury

Pay special attention to the risk of injury caused by scalding hot water.
After installation, you may find some warm water in the cold water line at the sink where the valve is installed. Once the cold water line is opened, the warm water will dissipate in a very short time.

WARNING 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 accidentally switched on.

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 Electric shock
Death or serious personal injury

Do not switch on the power supply until the product has been properly installed.

WARNING Electric shock
Death or serious personal injury

Ensure the pump’s grounding conductor is connected only to a properly grounded grounding type receptacle.
For safe operation of this pump, it must be grounded in accordance with national, state, and local governing codes and regulations.

Before installation, review the installation procedures in this document to insure proper and safe installation. Failure to follow procedures described in this document couldaffect your warranty and may cause inadvertent property damage. The operating voltage and other electrical data are marked on the motor label. Make sure that the motor is suitable for the electrical supply on which it will be used.

Pipe connections

When connecting pipes, be sure to follow the pipe manufacturer’s recommendations and all code requirements for pipe material.
Do not use Teflon® tape or pipe joint compound, that is pipe dope, on the valve threads.

Installing the pump

Close the water supply valve to the water heater, typically located above the water heater on the cold-water inlet to the water heater.
Drain the water from the hot-water pipe by opening a water faucet in the house. Let the water run until it stops flowing. Then drain the remaining water from the water heater spigot. Make sure to leave the faucet open until the pump installation is complete. If water does not stop flowing, check to make sure the water to the water heater has been completely shut off.
Disconnect the hot-water pipe from the hot-water outlet of the water heater. See fig. 1.
Install the pump onto the water heater outlet, using the 3/4″ female fitting and gasket supplied on the pump. Ensure that the pump shaft is horizontal. Install the pump so that it pumps away from the water heater, towards the house. See the flow arrow on the side of the pump housing for reference. Be sure that the pump does not touch the exhaust vent pipe (chimney) of a gas- or oil-fired water heater. See fig. 2.
Connect the hot-water line to the 3/4″ NPT outlet of the pump. Use pipe joint compound, that is pipe dope, or Teflon® tape to seal the threads when connecting to a 3/4″ female NPT connection. If a gasketed flexible copper water-heater connector is used, pipe joint compound, that is pipe dope, or Teflon® tape is not required.
Reopen the water supply valve to the water heater and allow the water to run until all the air has been purged from the pipes.
Close the faucet inside the house.
Plug the power cable of the pump into a 115 V outlet. Be sure to route the power cable so that it does not touch the exhaust vent pipe of a gas- or oil-fired water heater.
Use the timer to set the pump to operate around your peak use times, such as 30 minutes before the first shower until 15 minutes after the last shower. See section 5.1 Setting the timer.

Installing the bypass valve

Do not use Teflon® tape or pipe joint compound, that is pipe dope, on the valve threads.
Tighten the flex hose connections by hand, plus 1/4 turn with a wrench.
Overtightening the flex hose connections can result in damage to the bypass valve, causing the valve to leak, and in localized water damage.
Use only the flex hoses provided in this kit. Using other manufactured flex hoses could result in damage to the bypass valve and void the product warranty.
When connecting pipes, be sure to follow the pipe manufacturer’s recommendations and all code requirements for pipe material.
Typically, the hot water is on the left side and the cold water is on the right side, when looking at the sink.

Valve location
For the greatest effect, the bypass valve must be located beneath a faucet with the greatest pipe distance from the water heater. If your home has a branched hot water line, more than one bypass valve may be necessary.

Disconnecting the risers

Close the angle stop valves for the hot and cold water below the sink; see fig. 3.
Disconnect the risers; see fig. 4.
Close the angle stop valves for the hot and cold water under the sink before installing the bypass valve
Disconnect the risers before installing the bypass valve

Installing the bypass valve

Connect the 1/2″ X 1/2″ flex hoses to the ports on the bypass valve marked “HOT OUT” and “COLD OUT”. See fig.
Connect the 1/2″ x 3/8″ flex hoses to the ports on the bypass valve marked “HOT IN” and “COLD IN”. See fig. 5.
Connect the 1/2″ hose fitting from the “HOT OUT” port on the bypass valve to the left side of the faucet. See fig. 5.
Connect the 1/2″ hose fitting from the “COLD OUT” port on the bypass valve to the right side of the faucet. See fig. 5.
Connect the 3/8″ hose fitting from the “HOT IN” port on the bypass valve to the left angle stop valve. See fig. 5.
Connect the 3/8″ hose fitting from the “COLD IN” port on the bypass valve to the right angle stop valve. See fig. 5.
Open the angle stop valves for both the hot and cold water. Check for leaks.
The bypass valve may be mounted to the wall with supplied mounting screws if desired; two-hole mounting bracket flush with wall. See fig. 6.

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:

Close the angle stop valve for the cold water below the sink.
Open the cold-water faucet.
Check that when you turn on the cold-water faucet, the flow of cold water gradually decreases and stops as the bypass valve closes.
Check that when you turn on the hot-water faucet, hot water begins to flow quickly. For troubleshooting, see section 8. Fault finding the product.

Starting up the product

Setting the timer
The Grundfos timer control is designed only for use with specified Grundfos UP circulators installed in indoor hot-water service systems. The timer control turns the circulator on and off at preset times, allowing the user to select operation of the circulator during high use periods of the day.

Before starting the circulator, ensure that the system is filled with liquid and vented.

Set the actual time of the day

Turn the programming ring in the direction of the arrow located on the timer face, until the timing arrow points to the current time. See figs. 7 and 8.
Insert the 115 V plug on the power cable from the pump into a properly grounded 115 V outlet. Route the power cable so it does not touch the exhaust vent or pipe from a gas- or oil-fired water heater. The circulatorwill now start and is ready for timer settings selection.

Timer settings with three control options
Option one: 24 hours per day, 7 days per week, continuous pumping Set the manual switch in the “ON” position. Inthis mode, the pump will not be controlled by the programming tab settings.

Option two: Pumping controlled by specific times of the day
Set the manual switch in the “TIMER” position. To set the specific “ON” and “OFF” times during the day, push the programming tabs as follows:

Push the tabs away from the center ring to indicate the circulator is switched “ON”.
Push the tabs toward the center ring to indicate the circulator is switched “OFF”.

Please note the following:

Each programming tab equals 15 minutes.
In case of a power outage, the timer will not keep time. After the power has been restored, reset the timer. See instructions in section 5.1 Setting the timer;5.1.1 Set the actual time of the day.

Option three: No pumping
Set the manual switch in the “OFF” position. In this mode the circulator will not be pumping. The timer will still keep the time of day. GRUNDFOS-Comfort-
System-Hot-Water-Recirculation-System-FIG-7

Product introduction

A Grundfos Comfort System hot-water recirculation system 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 Grundfos Comfort System includes a circulator pump that you install on the water heater in your home, and a valve that you install at the furthest faucet. 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.

Intended use

WARNING Fire and explosion
Death or serious personal injury

Do not use the pump for flammable, combustible or explosive liquids such as diesel oil, gasoline, or similar 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.

For indoor potable water use only.

Pumped liquids
Grundfos Comfort System is intended for indoor residential potable drinking water use only and is to be considered where there is no hot-water return line available. The pump is lubricated and cooled by the liquid being pumped. Therefore, the pumped liquid must be allowed to circulate through the pump while it is in operation.

Identification
The pump nameplate shows information about the electrical requirements of the pump. Verify that the pump will be supplied with the proper voltage, phase, and frequency during operation. The motor of the pump is designed to run on ± 10 % of the voltage shown on the nameplate.

Approvals