Overview of Primary Product

Applications
UP Series
22
Pumped liquids
Depending on type, Grundfos circulator pumps are
designed for the following liquids:
• Potable water
• Non-potable water
• Water/glycol mixtures
• Chilled water
• Domestic-hot water
• Softened water.
If the circulator pump is used for a glycol mixture with a
higher viscosity than that of water, the hydraulic
performance of the pump will be reduced.
Example: 50 % glycol at 68 °F (20 °C) means a
viscosity of approx. 10 cSt and a reduction of pump
performance by approx. 15 %.
When selecting a pump, the viscosity of the pumped
liquid must be taken into consideration.
Ambient and liquid temperatures
The maximum allowable water temperature is
determined by the ambient or surrounding air
temperature as shown in the table below.
Note: If the UP pump is equipped with a timer, the maximum liquid
temperature is 150 °F (66 °C).
The above table refers to all standard product without
timer/control options or other special features.
The ambient temperature for standard pumps with a
permissible liquid temperature from 36 °F (2 °C) to
230 °F (110 °C) should always be lower than the liquid
temperature, as otherwise condensation may form in
the stator housing.
Temperature requirements for pumps with timer/
control or other special features may be found on
their technical data page.
Maximum system pressure
145 psi (10 bar).
Minimum inlet pressure
The amount of pressure required at the inlet of a pump
is a function of the temperature of the water as shown
in the table below.
Performance
Flow range 0-64 U.S., head range 0-38 feet
In a pressure system, the required inlet pressure is the
allowable system pressure.
In a system open to the atmosphere, the required inlet
pressure is the minimum distance the pump must be
located below the lowest possible water level of the
water source (tank, pool, etc.).
Maximum water temperature
Ambient (°F) 104 120 140 160 175
Water, all cast iron (°F) 230 220 210 190 175
Water, all bronze and stainl. steel 220 210 190 175
*exceptions below
UP/UPS 15 FC and UP 43 FC (°F) 200 190 180 170
UP 15BUC5 and UP 15BUC7 (°F) 200 190 180 170
UPS 15-35 (°F) 165 140 - - -
UP 15-100F (°F) 205 195 185 175 -
UP 26-120U (°F) 205 195 185 175 -
UP 26-116 (°F) 150 140 - - -
Minimum inlet pressure
Liquid temperature 230° (110 °C) 190° (88 °C) 140° (60 °C)
Feet of water 36 ft (1.10 m) 9 ft (2.8 m) 3 ft (0.9 m)
Inlet pressure 15.6 psi 4.0 psi 1.3 psi
UPSeries.book Page 22 Tuesday, September 18, 2007 1:01 PM