Specification

Applications
UP Series
5
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5. Applications
The Grundfos circulator pumps, Series UP(S), are
specifically designed for heating systems. The pumps
are also suitable for circulation of hot domestic water
and for circulation of liquid in cooling and air-
conditioning systems.
Heating systems
Common uses:
• Boiler/hydronic heating
• Ground-source heat pumps
• Radiant floor heating
• Hydronic and fan-coil heating
• Solar heating
• Heat recovery/heat pumps.
Pump types with cast iron pump housing are generally
used for these applications, considered to be closed
systems, for pumping water or water/glycol mixtures.
However, when water conditions are not compatible
with cast iron, we recommend the use of bronze or
stainless steel.
Optional variable-speed and mixing-reset controls are
available to customize heat output vs heat demand for
increased comfort.
Domestic hot-water systems
Common uses:
• Solar water heating
• Hot-water recirculation
• Domestic hot-water heating.
Pump types with bronze, brass or stainless steel pump
housing are used for these applications, considered to
be open systems, for pumping potable water.
Optional timer and thermostat controls are available to
limit pump operation to periods when hot water is
required and to save energy.
Cooling systems
Common uses:
• Chilled-water pumping.
Pump types UP(S) 25, 26, 43, 50 and pump housings
compatible with the pumped liquids are recommended
for chilled water due to their motor construction, which
is suitable for 32 °F (0 °C) water.
Construction
The UP(S) pumps are of the canned rotor type, i.e.
pump and motor form an integral unit without shaft seal
and with only two gaskets for sealing. The bearings are
lubricated by the pumped liquid.
The pumps are characterized by:
• Ceramic shaft and radial bearings
• Carbon thrust bearing
• Stainless steel rotor can and bearing plate
• Impeller of corrosion-resistant material
• Pump housing of cast iron, bronze or stainless
steel.