Table of Contents
Advertisement
7.7. DIRECT EXPANSION COILS CONNECTION (DX)
Coil characteristics
DX 4 rows coil
For applications with 100% recirculated air
UTBS
Volume
Phases Tubes Rows Circuits
(l)
UTBS-2
1,2
UTBS-3
2,21
UTBS-5
2,41
UTBS-8
4,4
DX 6 rows coil
For applications with 50% outdoor air/ 50% recirculated air
UTBS
Volume
Phases Tubes Rows Circuits
(l)
UTBS-2
2
UTBS-3
3,31
UTBS-5
4,3
UTBS-8
8,4
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:
1
10
4
1
12
4
1
12
3
1
15
3
1
10
6
1
12
5
1
12
5
2
15
6
10+10
Ø Liquid
header
(mm)
2
1/2" (13mm.)
3/4" (19mm.)
4
5/8" (16mm.)
3/4" (19mm.)
5
5/8" (16mm.)
3/4" (19mm.)
7
5/8" (16mm.)
3/4" (19mm.)
Ø Liquid
header
(mm)
5
5/8" (16mm.)
3/4" (19mm.)
6
5/8" (16mm.)
3/4" (19mm.)
9
5/8" (16mm.)
7/8" (22mm.)
5/8" (16mm.)
7/8" (22mm.)
22
Ø Gaz
Cooling
Heating
header
power
power
(mm)
(kW)
4,6
8,8
10,9
19,9
Ø Gaz
Cooling
Heating
header
power
power
(mm)
(kW)
10,0
19,4
26,6
47,8
Airfl ow
(m
3
/h)
(kW)
4,9
1.250
8,0
2.500
10,0
3.500
17,2
6.000
Airfl ow
(m
3
/h)
(kW)
10,5
1.250
19,9
2.500
27,6
3.500
49,8
6.000
Advertisement
Table of Contents
