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4. Installation
4.1 Position of terminal box
Proper installation of the pump will have the
terminal box located to one side of the pump or
the other, with the conduit entry down.
See fig. 1.
Fig. 1
Recommended terminal box
orientation
4.2 How to change the terminal box
position
Warning
If the terminal box position needs
to be changed, ensure that the
power supply is turned off and
close the isolating valves before
removing the hex socket head
screws.
How to change terminal box position:
1. Remove the four (4) hex socket head screws
(4 or 5mm wrench) while supporting the
stator (motor).
2. Carefully separate the stator from the pump
housing and rotate it to the correct terminal
box orientation.
3. Replace the hex socket head screws and
tighten diagonally and evenly
(7 ft.-lb. torque).
4. Check that the impeller turns freely. If the
impeller does not turn easily, repeat the
disassembly/reassembly process.
4.2.1 Pump mounting: for indoor use
When making pipe connections, be sure to
follow the pipe manufacturer's recommendations
and all code requirements for piping material.
Arrows on the side or bottom of the pump
housing indicate direction of flow through the
pump. Grundfos circulator pumps can be
installed in both vertical and horizontal lines.
The pump must be installed with the motor shaft
positioned horizontally.
Under no circumstances should the pump be
installed with the shaft vertical or where the
shaft falls below the horizontal plane.
See fig. 2.
Acceptable
Not acceptable
Fig. 2
Acceptable pump mounting
positions
We recommend that isolating valves be installed
on each side of the pump. If possible, do not
install elbows, branch tees, and similar fittings
just before or after the pump. Provide support to
the pump or adjacent plumbing to reduce
thermal and mechanical stress on the pump.
4.3 Installation requirements
1. Thoroughly clean and flush the system prior
to pump installation.
2. Do not install the pump at the lowest point of
the system where dirt and sediment naturally
collect.
3. Install an air vent at the high point(s) of the
system to remove accumulated air.
4. Ensure that water does not enter the
terminal box during the installation process.
5. Open system: Install the pump in the supply
line; the suction side of the pump should be
flooded with water. Ensure that the static
head requirement from Table B is achieved.
6. Closed system: Install a safety relief valve to
protect against temperature and pressure
build-up.
7. If the water contains suspended particles, we
recommend that a strainer and/or filter be
installed and cleaned regularly.
Do not start the pump until the
system has been filled.
4.3.1 Check valve removal
1. Use needle-nose pliers to remove check
valve from pump housing.
2. Check to make sure no part of the valve
remains in the pump housing.
3. Apply the enclosed round "Check Valve
Removed" label over the check mark symbol
located on the nameplate of the pump.
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