Grundfos NB Series, Installation And Operating Instructions Manual

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8
CONTENTS
Page
1. General information 8
2. Delivery and handling 8
2.1 Delivery 8
2.2 Handling 8
3. Type keys 9
3.1 Type NB 9
3.2 Type NBG 9
3.3 Impeller diameter 11
3.4 Pumped liquids 11
4. Technical data 11
4.1 Ambient temperature 11
4.2 Liquid temperature 11
4.3 Operating pressure 11
4.4 Min. inlet pressure 11
4.5 Maximum inlet pressure 11
4.6 Minimum flow rate 11
4.7 Maximum flow rate 11
4.8 Electrical data 11
4.9 Weight 11
4.10 Sound level 11
4.11 Pump speed relative to material and size 11
5. Pump without motor 12
5.1 Motor without feet 12
5.2 Motor with feet 14
6. Installation 16
6.1 Preparations before installation 16
6.2 Pump location 16
6.3 Connection 16
6.4 Foundation 17
6.5 Vibration dampening 17
6.5.1 Expansion joints 17
6.5.2 Vibration dampers 17
6.6 Direct mounting in pipework 17
6.7 Pipework 18
6.8 Bypass 18
6.9 Measuring instruments 18
7. Flange forces and moments 19
8. Electrical connection 20
8.1 Motor protection 20
8.2 Frequency converter operation 20
9. Start-up 20
9.1 General information 20
9.2 Priming 20
9.3 Checking the direction of rotation 21
9.4 Start-up 21
9.5 Start/stop 21
10. Maintenance 21
10.1 Pump 21
10.2 Mechanical shaft seals 21
10.3 Motor 21
10.4 Lubrication 21
10.4.1 Bearing grease 21
11. Periods of inactivity and frost protection 21
12. Service 21
12.1 Service kits 21
13. Calculation of minimum inlet pressure 22
14. Fault finding chart 23
15. Disposal 24
1. General information
Pump type and model are stated on the pump nameplate.
The pumps are fitted with Grundfos motors, type MG or MMG. If
the pump is fitted with a motor make other than Grundfos, please
note that the motor data may differ from the data stated in this
booklet. This may also influence the pump performance.
2. Delivery and handling
2.1 Delivery
The pumps are tested 100% before leaving the factory. The test
includes a function test where the pump performance is meas-
ured to ensure that the pump meets requirements of relevant
standards. Test certificates are available from Grundfos.
The pumps are delivered from the factory in a carton with a
wooden bottom designed for transport by equipment such as a
forklift truck.
Pump motors as from 4 kW are supplied with lifting eyes.
2.2 Handling
Pumps fitted with motors should be lifted by means of nylon
straps and shackles, if required. See fig. 1.
Fig. 1 Correct lifting of pump
Fig. 2 Incorrect lifting of pump
Prior to installation, read these installation and oper-
ating instructions. Installation and operation must
comply with local regulations and accepted codes of
good practice.
Pump motors as from 4 kW are supplied with lifting
eyes which must not be used for lifting the entire
pump unit. See fig. 2.
T
M
03
39
73
13
06
TM
03
39
72
13
06