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6. Applications
Compare the pump’s nameplate data or its performance curve
with the application in which you plan to install it. Make sure the
application falls within the following limits.
7. Operating conditions
7.1 Ambient temperature and altitude
If the ambient temperature exceeds the maximum temperature
limits of the pump or the pump is installed at an altitude
exceeding the altitude values in the chart below, the motor must
not be fully loaded due to the risk of overheating.
Overheating may result from excessive ambient temperatures or
the low density and consequently low cooling effect of the air at
high altitudes. In such cases, it may be necessary to use a motor
with a higher rated output (P
2).
Fig. 3 Relationship between motor output (P
2) and ambient
temperature/altitude
Legend
Example: From fig. 3 it appears that P
2 must be reduced to 88 %
when a pump with a NEMA premium-efficiency ML motor is
installed 15,584 feet above sea level. At an ambient temperature
of 167 °F, P
2 of a standard-efficiency motor must be reduced to
74 % of rated output.
In cases where both the maximum temperature and the maximum
altitude are exceeded, the derating factors must be multiplied.
Example: 0.89 x 0.89 = 0.79.
7.2 Liquid temperatures
All motors are designed for continuous duty in 104 °F (40 °C)
ambient air conditions. For higher ambient temperature
conditions, consult Grundfos.
* We recommend xUBE shaft seals for temperatures above
200 °F. Pumps with KUHE hybrid shaft seals can only operate
up to 200 °F (90 °C). Pumps with xUUE shaft seals can be
operated down to -40 °F (-40 °C). ("x" is the seal type).
7.3 Minimum inlet pressures
Type Application/liquid
CR
Hot and chilled water, boiler feed, condensate
return, glycols and solar thermal liquids.
CRI/CRN
Deionized, demineralized and distilled water.
Brackish water and other liquids unsuitable for
contact with iron or copper alloys. (Consult
manufacturer for specific liquid compatibilities.)
CRN-SF
High-pressure washdown, reverse osmosis or other
high-pressure applications.
CRT
Salt water, chloride based liquids and liquids
approved for titanium.
TM03 4272 2006
Pos. Description
1 NEMA standard-efficiency motors
2 NEMA premium-efficiency motors
60 80 100 120 140 160 180
T [°F]
50
60
70
80
90
100
[%]
P2
1
2
3280 7382 11483 15584 ft
Pump Liquid temperature
CR, CRI, CRN 1s, 3, 5, 10, 15, and 20
-4 to +248 °F
(-20 to +120 °C)
CR, CRN 32, 45 and 64*
-22 to +248 °F
(-30 to +120 °C)
CRT 2, 4, 8, 16
-4 to +248 °F
(-20 to +120 °C)
CRN-SF
-4 to +221 °F
(-15 to +105 °C)
Pumps with Cool-Top™
up to 356 °F
(180 °C)
Maximum water temperature for NSF 61 drinking
water applications is limited to 73 °F (23 °C).
All CR, CRI, CRN NPSHR + 2 feet
CRN-SF 29 psi (2 bar)
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