Airwell MQL 6 [15/40] Installation
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Airwell MQL 6 [15/40] Installation

Airwell MQL 4 [15/40] Installation
* Maximum height 15 meters
Page 14
Installation
4.3 Pressure Drop in Tubes and
Accessories
To determine the appropriated pipe section, see
table n° 1 which shows the values of pressure drop
for various water flows and the diameter of stan-
dard copper pipes for hydraulic installations.
4.4 Hydraulic connection
The water inlet/outlet fittings shall conform to the in-
structions provided by the plates affixed neat the
connection points.
4.5 Principle Diagram
of Water Circuit
The MQL/MQH are to be connected with the termi-
nal units such as fan coil units, cassettes or wall
mounted units. Each terminal unit connected with
the MQL/MQH water chiller and provided with its
own control is therefore completely independent of
the chiller (see diagram of principle on the left).
* If the terminal unit is on a lower level than the
MQL/MQH water chiller, make sure the water
pressure in the chiller is at least 0.5 bar.
4.6 Draining the defrosting waste
water (for heat pump unit only)
When heat pump units work in heating mode, dur-
ing defrosting cycles, they may discharge water
from the base.
The heat pump units must be installed in positions
where the defrosting water cannot create any dam-
age.
Table n° 1
Pressure drop (mm WG / m)
Velocity (m/s)
Nominal diameter
13 x 15 16 x 18 20 x 22 26 x 28 33 x 35
Flow
(l/h)
600
172
1,25
65
0,83
22
0,53
400
86
0,84
32
0,55
800
286
1,67
108
1,11
37
0,71
10
0,42
1000
158
1,38
55
0,88
16
0,52
5
0,32
1200
216
1,65
75
1,06
22
0,63
7
0,39
1400
284
1,93
99
1,24
28
0,73
9
0,45
1600
124
1,41
36
0,84
12
0,52
1800
133
1,59
44
0,94
14
0,58
2000
184
1,77
52
1,04
17
0,65
2200
217
1,94
62
1,15
20
0,71
2400
254
2,12
72
1,25
23
0,78
Tabella n° 2
1 mm WG = 9,81 Pa.
Equivalent length (m)
Nominal diameter
0,2 0,2 0,3 0,4 0,5Ball check valve
0,2 0,2 0,26 0,35 0,545° Bend
0,4 0,4 0,5 0,7 1,090° Bend
0,3 0,3 0,4 0,6 0,8690° Curve
0,8 0,8 1,0 0,5 2,0T-piece
13 x 15 16 x 18 20 x 22 26 x 28 33 x 35
Accessories
The grey area shows pressure drop in mm of water
gauge/m and the velocity in m/s recommended for
various flows and diameters.
Intermediate values are determined through interpo-
lation.
Values outside the grey area correspond to exces-
sive pressure drops and should be avoided.
Table n° 2 shows the equivalent length pipe with
the same diameter, of a few common accessories
for this type of installation.
Manuale MQL-MQH 10.6.2005 12:26 Pagina 14

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