In
St
alla
tI
on
Using the pump
28
English
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.
Pump performance chart
NPSH
[m]
0
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17
Q [m
³
/h]
2
4
6
8
10
12
14
16
50Hz
H
[m]
30
35
25
100
20
15
10
0
5
[%]
120
140
80
60
40
0
20
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14
Q [m³/h]
15
efficiency,
Head, H
P
[kW]
1.2
1.6
1.4
1.0
25
0.8
0.6
0.4
0
0.2
NPSH
[m]
30
40
35
20
15
10
0
5
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14
Q [m³/h]
15
NPSH
Power, P
• 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
Pumped liquid = Water
Liquid temperature = 20°C
Density = 998.2 kg/m³
DB68-05916A-09_IM_DVM Chiller Outdoor_EU_EN_.indd 28
2022-05-02 오전 9:00:01
