Installing The Product; Pipe Connections; Installing The Pump - Grundfos Comfort System Installation And Operating Instructions Manual

4. 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 could
affect 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.

4.1 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
compound, that is pipe dope, on the
valve threads.

4.2 Installing the pump

1. Close the water supply valve to the water
heater, typically located above the water
heater on the cold-water inlet to the water
heater.
2. 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.
3. Disconnect the hot-water pipe from the hot-
water outlet of the water heater. See fig. 1.
4. 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.
5. Connect the hot-water line to the 3/4" NPT
outlet of the pump. Use pipe joint compound,
that is pipe dope, or Teflon
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.
6. 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.
7. Close the faucet inside the house.
8. Plug the timer into a 115 V outlet. Plug the
power cable of the pump into the timer
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.
9. 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.
®
tape or pipe joint
®
tape to seal the
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