Applications; Operating Conditions; Ambient Temperature And Altitude; Liquid Temperatures - Grundfos CR Installation And Operating Instructions Manual

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.
Type Application/liquid
Hot and chilled water, boiler feed, condensate
CR
return, glycols and solar thermal liquids.
Deionized, demineralized and distilled water.
Brackish water and other liquids unsuitable for
CRI/CRN
contact with iron or copper alloys. (Consult
manufacturer for specific liquid compatibilities.)
High-pressure washdown, reverse osmosis or other
CRN-SF
high-pressure applications.
Salt water, chloride based liquids and liquids
CRT
approved for titanium.

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
P2
[%]
100
90
80
70
60
50
60 80 100
3280
Fig. 3 Relationship between motor output (P
temperature/altitude
Legend
Pos. Description
1 NEMA standard-efficiency motors
2 NEMA premium-efficiency motors
Example: From fig. 3 it appears that P
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 of a standard-efficiency motor must be reduced to
2
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.
10
2
1
120 140 160 180
T [°F]
7382 11483 15584 ft
) and ambient
2
must be reduced to 88 %
2

7.2 Liquid temperatures

Pump
CR, CRI, CRN 1s, 3, 5, 10, 15, and 20
CR, CRN 32, 45 and 64*
CRT 2, 4, 8, 16
CRN-SF
Pumps with Cool-Top™
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).
Maximum water temperature for NSF 61 drinking
water applications is limited to 73 °F (23 °C).

7.3 Minimum inlet pressures

All CR, CRI, CRN
CRN-SF
Liquid temperature
-4 to +248 °F
(-20 to +120 °C)
-22 to +248 °F
(-30 to +120 °C)
-4 to +248 °F
(-20 to +120 °C)
-4 to +221 °F
(-15 to +105 °C)
up to 356 °F
(180 °C)
NPSHR + 2 feet
29 psi (2 bar)