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Using the pump
Frost protection
Pumps which are not being used during periods of frost
must be drained to avoid damage.
Remove the filling and drain plugs from the pump.
Do not refit the plugs until the pump is taken into
operation again.
CAUTION
Before startup after a period of inactivity, the pump
and the suction pipe must be completely filled with
liquid. See Start up (27).
Cleaning
Prior to a long period of inactivity, flush the pump with
clean water to prevent corrosion and deposits in the
pump.
Use acetic acid to remove possible lime deposits from
the pump.
Repairing the pump and connecting the
pipe
We recommend that
you fit isolating valves
on either side of the
pump. It is thus not
necessary to drain the
system if the pump
needs service.
The pump must not
be stressed by the
pipework.
Coupling bolt torque: 200 ± 10% kgfcm
The torque must not be exceeded.
WARNING
After product inspection, if the compressor is
operated while the refrigerant piping is leaked,
air may enter inside the compressor. It may cause
abnormal high pressure to develop inside the
compressor, leading to product malfunction or an
explosion.
28
English
Pump performance chart
NPSH
[m]
16
14
12
10
8
6
4
2
0
0
1
2
3
4
5
6
7
8
9
H
[m]
35
Head, H
30
25
20
15
10
5
efficiency,
0
0
1
2
3
4
5
6
7
P
[kW]
1.6
1.4
1.2
1.0
0.8
0.6
Power, P
0.4
0.2
NPSH
0
0
1
2
3
4
5
6
7
NPSH = Net Positive Suction Head
NPSH is the requirement to keep enough pressure
on the system to prevent cavitation.
Cavitation : flashing the moving fluid into a gas
Frequency : 50Hz
50Hz
10 11 12 13 14 15 16 17
Q
[m³/h]
[%]
Pumped liquid = Water
Liquid temperature = 20°C
140
Density = 998.2 kg/m³
120
100
80
60
40
20
0
8
9
10 11 12 13 14
15
Q [m³/h]
NPSH
[m]
40
35
30
25
20
15
10
5
0
8
9
10 11 12 13 14
15
Q [m³/h]
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