Minimum Flow Rate; Technical Data; Electrical Data; Frequency Of Starts And Stops - Grundfos CR-H Serie Instrucciones De Instalación Y Funcionamiento

6.6 Minimum flow rate

Due to the risk of overheating, do not use the pump at flows
below the minimum flow rate.
The curves below show the minimum flow rate as a percentage of
the rated flow rate in relation to the liquid temperature.
Qmin
[%]
30
20
10
0
104 140 176 212 248 284 320 356
40 60 80 100 120 140 160 180
40 60 80 100 120 140 160 180
Fig. 5 Minimum flow rate
Legend
Curves Description
CR-H with standard top
CR-H with air-cooled top
Never operate the pump against a closed
Caution
discharge valve.

7. Technical data

7.1 Electrical data

See motor nameplate and section 9. Electrical connection.

7.2 Frequency of starts and stops

Maximum number of starts per hour
Motor sizes
Grundfos ML
0.33 to 5.0 hp 200
7.5 to 15 hp 100
20 to 100 hp 40

7.3 Dimensions and weights

See CR-H, CRN-H Product Guide.

7.4 Sound pressure level

See page 22.

8. Installation

The pump must be secured to a horizontal plane and solid
foundation by bolts. When installing the pump, follow the
instructions in the following sections.

8.1 Base plate

Make sure that the base plate is clean of any debris. It may also
be necessary to have the base plate coated to protect the
material.

8.2 Foundation

The foundation/installation should be carried out in accordance
with the following instructions.
Note
Grundfos recommends to install the pump on a concrete
foundation which is heavy enough to provide permanent and rigid
support to the entire pump. The foundation must be capable of
absorbing any vibration, normal strain or shock. As a rule of
thumb, the weight of the concrete foundation should be 1.5 times
the weight of the pump and base plate. The concrete foundation
t [°F]
must have an absolutely level and even surface.
t [°C]
Place the pump and base plate assembly on the foundation, and
fasten it. The base plate must be supported on the whole area.
See fig. 6.
Fig. 6
The foundation should be at least 3 to 6 inches longer and wider
than the base plate.
The mass of the foundation must be at least 1.5 times the total
mass of the pump and base plate assembly.
In installations where noiseless operation is particularly
important, a foundation with a mass up to 5 times that of the
pump and base plate assembly is recommended. The pump may
Baldor
be fastened directly to an existing concrete floor if the floor meets
20
the criteria of a foundation.
15
To properly hold the base plate to the foundation, proper
10 foundation bolts are required. For proper holding of the base
through the foundation, the bolt length should extend from in the
foundation, the base height, and 0.25" - 0.50" above the nut.
These foundation bolts are embedded in the concrete floor or
foundation, and should be positioned according to the bolt
manufacturer's instructions. To assist in the proper location of the
bolts, a template can be formed. The bolt locations should be
double-checked with drawings and base.
The pump should be placed as close to the liquid
source as possible. Adequate space for
operation and maintenance should be taken into
consideration.
Correct installation
9