Overview of Primary Product

UP Series
20
Applications
The Grundfos circulator pumps, Series UP, 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 housing are generally used
for these applications, considered to be closed systems
pumping water or water/glycol mixtures. However,
when water conditions exist that 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
housing are used for these applications, considered to
be open systems 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 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 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 in corrosion-resistant material
• Pump housing in cast iron, bronze or stainless steel.
UPSeries.book Page 20 Tuesday, September 18, 2007 1:01 PM