40
5 - APPLICATION DATA
5.6.2 - 30WG with option 6
30WG
Minimum evaporator glycol solution ow rate, l/s
Minimum
(4)
Minimum
T
Low pressure High pressure
20
1,4 1,3 0,5
25
1,5 1,3 0,5
30
1,5 1,3 0,5
35
1,6 1,5 0,6
40
1,7 1,5 0,6
45
1,8 1,5 0,8
50
2,5 2,2 0,8
60
2,2 2,3 1,0
70
2,2 2,4 1,1
80
2,3 2,4 1,3
90
2,5 2,5 1,5
110
2 1,4 1,5
120
2 1,4 1,5
140
2 1,4 1,5
150
2 1,4 1,5
170
2 1,4 1,5
190
2 1,4 1,5
(1) Option 6 : Glycol solution production, very low temperature
(2) Option 5B : Glycol solution down to 0°C
(3) Option 272 : Glycol solution down to -5°C
(4) Units with hydraulic module
Minimum ow rate for a maximum permitted temperature difference at the
minimum leaving water temperature
T Units without hydraulic module
Minimum ow rate for a maximum permitted temperature difference at the
minimum leaving water temperature
5.7 - Minimum water volume
Wichever the system, the water loop minimum capacity is given
by the table below:
61WG/30WG/30WGA size 20 25 30 35 40 45
Pure water l 538 807 1077 1346 1615 1830
61WG/30WG/30WGA size 50 60 70 80 90
Pure water l 269 359 449 538 610
61WG/30WG/30WGA size 110 120 140 150 170 190
Pure water l 269 323 366 192 231 261
ATTENTION: Minimum water volume required between the unit
and possible customer-supplied valves to the outside of the unit.
Industrial process applications
Certain industrial processes may require high leaving water
stability. In these cases the values above must be increased.
It may be necessary to add a buffer water tank to the circuit in
order to achieve the required volume. The tank must itself be
internally bafed in order to ensure proper mixing of the liquid
(water or brine). Refer to the examples below.
Bad
Bad
Good
Good
5.8 - Maximum water loop volume (evaporator
and condenser side)
Units with hydraulic module incorporate an expansion tank sized
for the maximum water loop volume.
5.9 - Expansion tank
The expansion tank is supplied with a pressure of 1 bar relative
(±20%). The maximum operating pressure for the tank is 4 bar.
5.10 - Protection against cavitation (option 116)
To ensure the durability of the pumps in the integrated hydraulic
modules, the control algorithm of the units incorporates anti-
cavitation protection.
It is therefore necessary to ensure a minimum pump entering
pressure of 60 kPa (0.6 bar) during operation and at shut-down.
A pressure below 60 kPa will prohibit unit start-up or cause an
alarm with the unit shutting down.
In order to obtain sufcient pressure, it is recommended:
- to pressurise the hydraulic circuit between 100 kPa and 300
kPa (1 and 3 bar) maximum on the suction side of the pump,
- to clean the hydraulic circuit before charging water,
- to regularly clean the screen lter.
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