UP/UPS Pumps Product Guide

Applications
UP Series
5
40
5. Applications
The Grundfos circulator pumps, series UP(S), are
specifically designed for heating systems. The pumps
are also suitable for recirculation of hot domestic water
and for circulation of liquid in cooling and air-
conditioning systems.
Heating systems
Common uses:
• Boiler/hydronic
• ground-source
• radiant floor
• hydronic and fan-coil
•solar
• heat recovery.
Pump types with a cast iron pump housing are
generally used for pumping water or water/glycol
mixtures in these closed-system applications.
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 versus heat
demand for increased comfort.
Domestic hot-water systems
Common uses:
• Solar water heating
• hot-water recirculation
• domestic hot-water heating.
Pump types with a bronze, brass or stainless steel
pump housing are used for pumping potable water in
these open-system applications.
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.
We recommend that you use pump types UP(S) 25,
26, 43, 50 and pump housings compatible with the
pumped liquids 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 wet-rotor type, i.e. pump
and motor form an integral unit without a shaft seal and
with only two gaskets for sealing. The bearings are
lubricated by the pumped liquid.
The pumps are characterized by these features:
• 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.