Pump; Motor; Terminal Box Positions; Viscosity - Grundfos CR 95 Data Booklet

CR, CRN 95-155

Pump

The CR pumps are non-self-priming, vertical
multistage centrifugal pumps.
The pumps are available with a Grundfos or Baldor
standard motor.
The pump consists of a base and a pump head. The
chamber stack and the sleeve are secured between
the base and the pump head by means of staybolts.
The base has inlet and outlet ports on the same level
(in line). All pumps are fitted with a maintenance-free
mechanical shaft seal of the cartridge type.
Shaft seal
(cartridge type)
Impellers
Base
Fig. 3 CR pump

Motor

Grundfos ML standard and Baldor motors
CR, CRN pumps are fitted with a totally enclosed,
fan-cooled, 2-pole Grundfos or Baldor standard motor.
Angular contact bearings are fitted to the drive end on
motors up to 75 Hp (56 kW). This ensures that the
motor bearing life (L10) is extended to match that of
the pump.
Electrical data
Efficiency class NEMA Premium
Insulation class F/B
Enclosure type* TEFC
3 x 208-230 VΔ / 3 x 380-480 V Y
Rated voltage**
3 x 575 VΔ (only Canada)
Number of poles 2
Frequency, standard motors 60 Hz
* A different enclosure type is available on request.
** Different voltages are available on request.
Grundfos E-motors
We also offer frequency-controlled CRE, CRNE pumps
which are the ideal choice for a number of applications
characterized by a demand for variable flow at
constant pressure. These pumps are suited for water
supply systems and pressure boosting as well as for
industrial applications. Depending on the application,
the pumps offer energy savings, increased comfort and
improved processing.
Optional motors
The Grundfos standard range of motors covers a wide
variety of application demands. However, for special
applications or operating conditions, custom-built
motor solutions can be provided.
Motor
For special applications or operating conditions, we
offer custom-built motors such as
Coupling
• Explosion-proof motors
• Motors with anti-condensation heating unit
• motors with thermal protection.
Pump head
Motor protection
Single-phase Grundfos motors have a built-in thermal
overload switch (TP 211 according to IEC 34-11).
Sleeve
Three-phase motors must be connected to a
motor-protective circuit breaker according to local
Staybolts regulations.
Three-phase Grundfos ML motors 5 Hp ( 5 kW) and
larger have a built-in thermistor (PTC) according to
DIN 44082 (TP 211 according to IEC 34-11).
Base plate

Terminal box positions

As standard, the terminal box is fitted on the inlet side
of the pump.

Viscosity

The pumping of liquids with densities or kinematic
viscosities higher than those of water will cause a
considerable pressure drop, a drop in the hydraulic
performance and a rise in the power consumption.
In such situations, the pump must be fitted with a
larger motor. If in doubt, contact Grundfos.
6 o'clock
9 o'clock 12 o'clock
position
position position
(standard)
Fig. 4 Terminal box positions
1
3 o'clock
position
7