7 - APPLICATION DATA
7.5 -
Water exchanger minimum water volume and flow rate
The Connect Touch control is equipped with anticipation logic making it highly flexible in adjusting operation to parameter drift,
particularly on hydraulic systems with low water volumes. By adjusting compressor running times, it prevents short cycle protection
cycles from starting and, in most cases, eliminates the need for a buffer tank.
Note
: The minimum heat transfer fluid volumes are calculated for EUROVENT rated conditions:
-
heat transfer fluid temperature in the water exchanger = 12°C / 7°C
-
inlet air temperature in the air exchanger = 35°C
This value applies to most air conditioning applications (assembly with fan coil units)
Note:
For installations operating on low water volumes (assembly with air handling unit) or for industrial processes, the buffer tank is
essential.
AQUACIAT
POWER
ILD ST / ILD HE
602
650
800
900
902
1000 1150 1200 1400 1600 1800 2000
Minimum system water volume, air conditioning application - cooling (litres)
420
451
494
539
654
750
827
914
993 1076 1159 1306
Minimum system water volume, air conditioning application - heating (litres)
1386 1513 1374 1457 1523 1362 1553 1374 1382 1362 1478 1618
Minimum system water volume, industrial process application (litres)
1091 1173 1283 1401 1699 1949 2150 2375 2582 2796 3014 3396
Min
(1)
/ max
(2)
water exchanger flow rate without hydronic module (l/s)
2.9 /
17.5
3.1 /
17.5
3.8 /
17.5
4.1 /
21.8
4.2 /
29.8
4.8 /
29.8
5.5 /
35.2
5.8 /
40.4
6.7 /
40.4
7.8 /
40.4
8.4 /
41.6
9.2 /
43.6
Water exchanger flow rate with low pressure hydronic module
(l/s)
Min.
(1)
single
2,9
3,1
3,8
4,1
4,2
4,8
5,5
8
8
8
8,4
9,2
Min
(1)
/ max
dual
3.2 /
10.3
3.2 /
10.3
2.5 /
12.2
2.5 /
12.2
2.7/
15
3.7 /
20.2
3.7 /
20.2
3.8 /
20.2
4.1/
25
8/
25
8/
25
5.4 /
26.5
Water exchanger flow rate with high pressure hydronic module
(l/s)
Min.
(1)
single
2,9
3,1
3,8
4,1
4,2
4,8
5,5
5,8
6,7
7,8
8,4
9,2
Min
(1)
/ max
dual
11.7 /
10.8
11.7 /
10.8
16.1 /
15.5
16.1 /
15.5
16.1 /
15.5
26.5 /
26.5
26.5 /
26.5
26.5 /
26.5
26.5 /
29.2
26.7 /
29.2
26.7 /
30.0
30.0 /
30.0
(1) Minimum flow rate for maximum allowable water temperature difference conditions (10K)
(2) Maximum flow rate for a pressure drop of 100 kPa in the plate heat exchanger
(3) Minimum factory flow rate setting according to the type of pump
NOTE: For the Buffer Tank Module option, the volume of the tank must be taken into account (550 litres)
7.6 - Maximum system water volume
Units supplied with a hydronic module may include an expansion vessel which limits the volume in the water loop.
The table below gives the maximum loop volume compatible with the expansion vessel (for pure water or ethylene glycol depending
on the system's various concentrations and static pressures). If this volume is less than the volume of the installed loop, then it is
necessary to add an additional expansion vessel within the system.
Maximum water loop volume (litres)
AQUACIAT
POWER
ILD ST / LD HE
602-900
902-2000
Static pressure (bar)
1
2
2,5
1
2
2,5
Pure water
2400
1600
1200
3960
2640
1980
10% EG
1800
1200
900
2940
1960
1470
20% EG
1320
880
660
2100
1400
1050
30% EG
1080
720
540
1740
1160
870
40% EG
900
600
450
1500
1000
750
EG: Ethylene glycol
EN-29
AQUACIAT
POWER
ILD
