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7. Operation
Grundfos domestic circulator pumps, installed
properly and sized for correct performance, will
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.
8. Troubleshooting
8.1 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, switch off
the power supply, and close the isolation 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 should be
started on speed 3 and then
adjusted to the regular setting.
The UPS 15-42 has an automatic
function to assist in restarting.
9. Disposal
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.
Subject to alterations.
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