Symbols Used In This Document; Applications; Technical Data; General Information - Grundfos CRN-SF Serie Notice D'installation Et De Fonctionnement

English (GB) Installation and operating instructions
Original installation and operating instructions.
CONTENTS
1.

Symbols used in this document

2.

General information

3. Type key
4.

Applications

5.

Technical data

5.1 Minimum inlet pressure
5.2 Maximum inlet pressure
5.3 Maximum operating pressure
5.4 Dimensions
5.5 Electrical data
6. Installation
6.1 Example
7. Startup
8. Disposal
Warning
Prior to installation, read these installation and
operating instructions. Installation and operation
must comply with local regulations and accepted
codes of good practice.
1. Symbols used in this document
Warning
If these safety instructions are not observed,
it may result in personal injury.
If these safety instructions are not observed,
Caution
it may result in malfunction or damage to the
equipment.
Notes or instructions that make the job easier
Note
and ensure safe operation.
2. General information
This document is a supplement to installation and operating
instructions of CR, CRI, CRN standard pumps, publication
number 96462123.
3. Type key
Example CRN- 10 - 21- SF - X - X - X- XXXX
Type range
3
Rated flow rate in m /h
Number of impellers
Code for pump version
Code for pipe connection
Code for materials
Code for rubber parts
Code for shaft seal
4. Applications
CRN-SF pumps are used for pressure boosting and circulation in
systems operating with high pressures. The pump requires a
Page minimum inlet pressure of 2 bar and is usually supplied together
with a CRN pump which is installed as a feed pump for the
3
CRN-SF pump.
3
3
5. Technical data
3
5.1 Minimum inlet pressure
3
3
2 bar at +20 °C.
3
If the liquid temperature is higher than +20 °C, the inlet pressure
3
must be increased according to
3
Example
3
The operating temperature is +80 °C. The total inlet pressure
4
must thus be 2 bar + 0.5 bar = 2.5 bar.
4
4
5.2 Maximum inlet pressure
4
CRN-SF
3, 5
10, 15, 20
32, 45, 64, 90
5.3 Maximum operating pressure
50 bar.
The actual inlet pressure + the maximum pump
Caution
pressure (at no flow) must not exceed 50 bar.
The pump must not to run against a closed
Caution
discharge valve.
During startup
If both pumps start at the same time, it is not necessary to take
the inlet pressure to the CRN-SF pump into account.
If the pumps cannot start at the same time due to
the total locked-rotor current, the CRN-SF pump
Caution
must start first, followed by the feed pump with a
delay of maximum three seconds.
5.4 Dimensions
See Fig. A on page 29.
5.5 Electrical data
See the motor nameplate.
Fig. B on page 30.
Pressure
[bar]
25
25
25
3