Grundfos CH 12, Installation And Operating Instructions Manual

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6
CONTENTS
Page
1. General description 6
1.1 Applications 6
1.2 Operating conditions 6
1.3 Technical data 6
1.4 Sound pressure level 6
2. Installation 7
2.1 Pump location 7
2.2 Position of terminal box 7
2.3 Pipework 7
2.4 Installation examples 7
3. Electrical connections 8
3.1 Checking of direction of rotation 8
4. Starting 8
4.1 Priming 8
4.2 Frequency of starts and stops 8
5. Operation and maintenance 8
5.1 Frost protection 8
6. Fault finding chart 9
7. Disposal 9
Before beginning installation procedures,
these installation and operating instruc-
tions should be studied carefully. The in-
stallation and operation should also be in
accordance with local regulations and ac-
cepted codes of good practice.
1. General description
1.1 Applications
The CH/CHN range of Grundfos horizontal multi-
stage centrifugal pumps are designed for the pump-
ing of water and other thin, non-aggressive and non-
explosive liquids, not containing solid particles or fi-
bres.
1.2 Operating conditions
1.2.1 Liquid temperature
0°C to +90°C.
1.2.2 Ambient temperature
Up to +55°C.
1.2.3 Maximum operating pressure
0°C to +40°C: Up to 10 bar.
+41°C to +90°C: Up to 6 bar.
1.2.4 Maximum inlet pressure
The actual inlet pressure plus the pressure when the
pump is operating against a closed valve should al-
ways be lower than the “maximum operating pres-
sure”.
1.2.5 Minimum inlet pressure
The table below applies to the maximum flow rates
of the pumps and a barometric pressure of
760 mmHg.
The values stated are the minimum inlet pressures/
maximum suction lifts “H” [m head] at the pump suc-
tion port. The values are stated at different liquid
temperatures.
The head loss in the suction pipe
should therefore be taken into account.
The maximum suction lift may be limited by the ac-
tual head.
“H” = minimum inlet pressure during operation.
“H” marked * = maximum suction lift during opera-
tion.
1 m head
≈
0.1 bar.
1.3 Technical data
1.3.1 Electrical data
See the pump nameplate.
1.3.2 Dimensions
See page 103.
1.4 Sound pressure level
The sound pressure level of the pump is lower than
the limiting values stated in the EC Council Directive
98/37/EC relating to machinery.
Type H [m head]
50 Hz 20°C 40°C 55°C 90°C
CH 2 *4.1 *3.6 *2.7 2.8
CHN 2 *4.1 *3.6 *2.7 2.8
CH 4 *7.5 *7.0 *6.1 *0.6
CHN 4 *7.5 *7.0 *6.1 *0.6
CH 8 *6.3 *5.8 *4.9 0.6
CH 12 *5.6 *5.1 *4.2 1.3
60 Hz
CH 2 *3.1 *2.6 *1.7 3.8
CHN 2 *3.1 *2.6 *1.7 3.8
CH 4 *6.8 *6.3 *5.4 0.1
CHN 4 *6.8 *6.3 *5.4 0.1
CH 8 *6.9 *6.4 *5.5 0.0
CH 12 *3.5 *3.0 *2.1 3.4