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5.10.3 - Standard 30WG/30WGA
30WG
30WGA
Evaporator water flow rate, l/s
Minimum*
Minimum** Maximum***
Maximum****
Low
pressure
High
pressure
Low
pressure
High
pressure
020
1.0
0.9
0.5
3.1
3.6
3.8
025
1.0
1.0
0.5
3.3
3.8
4.1
030
1.0
1.0
0.5
3.3
3.8
4.1
035
1.1
1.1
0.6
3.6
4.2
4.7
040
1.1
1.1
0.6
3.8
4.4
5
045
1.2
1.1
0.8
4.0
4.6
5.4
050
1.6
1.4
0.8
5.4
7.8
9.2
060
1.5
1.6
1.0
6.1
8.0
9.9
070
1.6
1.5
1.1
6.2
8.1
10.3
080
1.6
1.5
1.3
6.3
8.3
10.9
090
2.0
1.6
1.5
7.8
8.7
12.5
*
Units with hydronic module
Flow rate for a maximum permitted temperature difference at the minimum
leaving water temperature
** Units without hydronic module
Flow rate for a maximum permitted temperature difference at the minimum
leaving water temperature
*** Units with hydronic module
Maximum flow rate for an available pressure of 20 kPa (unit with low-pressure
hydronic module) or 50 kPa (unit with high-pressure hydronic module)
**** Units without hydronic module
Maximum flow rate for a pressure drop of 100 kPa in the plate heat exchanger.
30WG Condenser water flow rate, l/s
Minimum*
Maximum**
Maximum***
Low pressure
Low pressure
High pressure
020
0.3
3.1
3.5
3.8
025
0.3
3.3
3.8
4.1
030
0.3
3.3
3.8
4.1
035
0.4
3.5
4.1
4.7
040
0.4
3.7
4.3
5.0
045
0.4
3.9
4.5
5.4
050
0.4
4.8
6.8
7.0
060
0.5
5.5
7.0
7.5
070
0.5
5.6
7.2
7.8
080
0.6
5.8
7.4
8.2
090
0.6
7.2
7.9
9.3
*
Units with or without hydronic module
Minimum flow rate for a water temperature difference of 18 K-
Note: Operation permitted up to a value of 20 K.
** Units with hydronic module
Maximum flow rate for an available pressure of 20 kPa (unit with low-pressure
hydronic module) or 50 kPa (unit with high-pressure hydronic module)
*** Units without hydronic module
Maximum flow rate for a pressure drop of 100 kPa in the plate heat exchanger
5.10.4 - 30WG with option 6
30WG
Minimum evaporator glycol solution flow rate - option 6*, l/s
Minimum**
Minimum***
Low pressure
High pressure
020
1.4
1.3
0.5
025
1.5
1.3
0.5
030
1.5
1.3
0.5
035
1.6
1.5
0.6
040
1.7
1.5
0.6
045
1.8
1.5
0.8
050
2.5
2.2
0.8
060
2.2
2.3
1.0
070
2.2
2.4
1.1
080
2.3
2.4
1.3
090
2.5
2.5
1.5
*
Option 6: Glycol solution production, very low temperature
** Units with hydronic module
Minimum flow rate for a maximum permitted temperature difference at the
minimum leaving water temperature
*** Units without hydronic module
Minimum flow rate for a maximum permitted temperature difference at the
minimum leaving water temperature
5.11 - Minimum water volume
Whichever the system, the water loop minimum capacity is
given by the formula: Capacity = Cap (kW) x N Liters
Cap is the nominal system cooling capacity (kW) at the
nominal system operating conditions. This volume is neces-sary
for stable operation and accurate temperature control.
Application
N
61WG/30WG/30WGA
2.5
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 baffled in order to ensure proper mixing of the
liquid (water or brine). Refer to the examples below.
Bad
Bad
Good
Good
5.12 - Maximum water loop volume (evaporator and
condenser side)
Units with hydronic module incorporate an expansion tank
sized for the maximum water loop volume. The table below
gives the maximum water loop volume (in litres) for pure
water or ethylene glycol with various concentrations.
61WG/30WG/30WGA
020-045
060-090
Static pressure
kPa 100
200
300
100
200
300
bar
1
2
3
1
2
3
Pure water
l
220
450
75
340
225
115
10% ethylene glycol
l
165
110
53
255
170
85
20% ethylene glycol
l
100
70
35
150
100
50
35% ethylene glycol
l
85
55
30
130
85
45
5.13 - Expansion tank
The expansion tank is supplied with a pressure of 1 bar
relative (±20%). The maximum operating pressure for the
tank is 3 bar.
Summary of Contents for 30WG 020
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