Product Description - Grundfos CR 1s Manual Del Usuario

English (GB) Installation and operating instructions
Original installation and operating instructions.
CONTENTS
1. Symbols used in this document
2. General information
3.

Product description

4. Applications
5. Flushing liquid
5.1 Maximum flushing-liquid pressure and temperature
6. Flushing-liquid connections
7. Startup
8. Operation
8.1 Frost protection and draining of liquid
9. Dimensions
10. 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
These installation and operating instructions are a supplement to
installation and operating instructions for standard CR, CRI, CRN
pumps, publication No 96462123, and for CRN-SF pumps,
publication No 96530119.
3. Product description
This type of double seal consists of two shaft seals mounted in a
tandem arrangement in a separate seal chamber.
The seal can be used in these cases:
• The pump is operating with a negative pressure (vacuum).
• The pump is pumping crystallised liquids (e.g. sugar).
• The pump is pumping hardening liquids (oil products).
• The liquid temperature is up to +150 °C.
Only Grundfos cartridge seals can be used.
Note
If the primary seal is leaking, the pumped liquid will be flushed
away by the flushing liquid.
4. Applications
The seal shaft is available for the following Grundfos pumps:
Pump CR CR CR CR CR
type 1s 1 3 5 10
CR ● ● ● ● ●
CRI ● ● ● ● ●
CRN ● ● ● ● ●
6
Page
CR CR CR CR CR CR CR
15 20 32 45 64 90 120 150
● ● ● ● ● ● ●
● ●
● ● ● ● ● ● ●
5. Flushing liquid
The flushing liquid should be selected according to the
application and must not chemically attack the material of the
pump and the shaft seal.
The flushing-liquid flow should also be matched to the application
6
(recommended flow rate 25-200 l/h).
6
6
Warning
6 Never connect the flushing-liquid supply directly
to the public water supply system.
6
Local regulations must be observed.
6
It is possible to connect the seal chamber to a separate flushing-
6
liquid tank. In such cases, the manufacturer's installation and
8
operating instructions must be observed.
8
8
5.1 Maximum flushing-liquid pressure and
8 temperature
8
Due to the shaft seal design, the pressure in the seal chamber
must not exceed 25 bar. The pressure of the flushing liquid must
always be lower than the pressure of the pumped liquid.
The maximum temperature of the flushing liquid depends on the
rubber material of the shaft seal.
Shaft seal
EPDM
FKM
FFKM
FXM
6. Flushing-liquid connections
Legend to the letters used in the drawings:
Pos. A = pumped liquid.
Pos. C/D = outlet, flushing liquid.
Pos. E = inlet, flushing liquid, CR, CRN, CRI 1-20 and CR,
CRN 120-150 (C/D for CR and CRN 32-90).
Figures 4, 5 and 6 show seal chamber connections for flushing
liquid. They also show where to fit the sensor (pos. A), if
retrofitted.
Minimum 1 metre
C/D
Outlet 1/2"
Fig. 1 Tandem seal arrangement with circulating flushing
liquid
CR
In fig. 1, the flushing liquid circulates between an elevated tank
●
and the pump by natural circulation. Heated flushing liquid rises
from the seal chamber to the tank where it cools down.
The cooled-down flushing liquid returns to the seal chamber.
●
At high temperatures, the circulation of flushing liquid through the
seal chamber cools the seal faces of the shaft seal and reduces
noise.
Maximum temperature [°C]
+120
+90
+120
+120
E
Inlet 1/2"