5. Startup
Do not use the pump to vent the
system.
Do not start the pump before filling the
system.
Never let the pump run dry.
6. Operation
Grundfos domestic circulator pumps, installed
properly and sized for correct performance,
operate quietly and efficiently and provide years
of service.
Under no circumstances should the
pump be operated without water
circulation or without the minimum
required inlet pressure for prolonged
periods of time.
This could result in motor and pump
damage.
UPS model pumps are multispeed, and the speed
can be changed via a speed selector switch
located on the front of the terminal box.
UP models are single-speed.
7. Troubleshooting
7.1 Failure to operate
When UP and UPS 15, 26, 43, and 50 pumps are
first started, the shaft may rotate slowly until water
has fully penetrated the bearings.
If the pump does not run, the shaft can be rotated
manually. To accomplish this follow the below
instructions:
• Switch off the power supply, and close the
isolating valves on each side of the pump.
• Remove the indicator plug in the middle of the
nameplate.
• Insert a small flat-blade screwdriver into the
end of the shaft, and gently turn until the shaft
moves freely.
• Replace and tighten the plug. Open the
isolating valves and wait 2 to 3 minutes for the
system pressure to equalize before starting
the pump.
After a long shutdown period, multi-
speed pumps must be started on
speed 3 and then adjusted to the
regular setting.
The UPS 15-42 has an automatic
function to assist in restarting.
8. 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/product-recycling.
9. Document quality feedback
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