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6.9. CONNECTING THE UNIT TO THE DUCT SYSTEM
• Never use the unit as a support or weight-bearing structure for ductwork.
• Connect the unit to the air ducts using flexible connectors to prevent vibrations from
being transmitted to the duct system.
• Check to make sure air intake and flow are not being blocked and that there are no
obstacles impeding good air circulation. Failure to do so will affect the efficiency of the
system.
6.10. DIRECT EXPANSION COILS CONNECTION (DX)
Coil characteristics
UTBS
Volume
(l)
1,34
UTBS-2
2,01
2,65
UTBS-3
3,98
3,85
UTBS-5
5,78
6,28
UTBS-8
9,42
Installation recommendations
In units that incorporate direct expansion coils it is necessary to consider the following
installation recommendations:
1. The rigidity and stability of the installation ducts, should be ensured using, if necessary,
expansion joints and antivibration elements, avoiding the generation of stress due to the
transmission of vibrations to the distributor and suction headers.
2. When making the refrigerant circuits, allow free space enough to allow a right access for
maintenance tasks.
3. The connection to the suction line (liquid) should be done from the smaller diameter
manifold (recognizable because of the distributor), The gas line has to be connected to
suction header (larger diameter manifold).
4. The dimensioning and manufacture of the refrigerant installation must be performed by
qualifi ed personnel with specifi c training in refrigeration techniques (authorized insta-
llers), paying particular attention to:
Tubes
Rows
Circuits
10
4
4
10
6
6
12
4
6
12
6
8
12
4
8
12
6
12
15
4
15
15
6
20
Ø Liquid
Ø Gaz
Cooling
header
header
power
(mm)
(mm)
28,5 mm.
35 mm.
1-1/8"
1-3/8"
65
Heating
Airfl ow
power
(m
(kW)
(kW)
11
22
24
44
35
65
57
105
3
/h)
1.500
2.900
4.300
7.000
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