23
7.9. DIRECT EXPANSION COILS CONNECTION (DX)
Coil characteristics
DX 3 rows coil
For applications with 100% recirculated air
Model
Airfl ow
(m
3
/h)
Total
volume
(dm
3
)
Nº
stages
Ø Distributor
(liquid line)
Ø Gas
collector
Refrigeration
Condensation
Cold
power*
(kW)
R410A
Airfl ow
(kg/h)
ΔP
R410A
(kg/h)
Hot
power**
(kW)
R410A
Airfl ow
(kg/h)
ΔP
R410A
(kg/h)
UTV-2
2000
2,09
1
1/2"
1"
9,0
188
38
14,8
265
5,9
UTV-3
4000
4,29
1
1/2"
1"
18,1
379
34
29,7
531
5,5
UTV-6
5500
6,27
1
1/2"
1-1/4"
26,3
557
14
41,2
738
2,1
UTV-8
7000
7,7
2
1/2"
1-1/2"
35,4
740
37
55,9
1001
3,5
* Air inlet temperature: 25ºC / 50%H.R.
** Air inlet temperature: 15ºC / 40%H.R.
DX 4 rows coil
For applications with 50% outdoor air / 50% recirculated air
Modelo
Airfl ow
(m
3
/h)
Total
volume
(dm
3
)
Nº
stages
Ø Distributor
(liquid line)
Ø Gas
collector
Refrigeration
Condensation
Cold
power*
(kW)
R410A
Airfl ow
(kg/h)
ΔP
R410A
(kg/h)
Hot
power**
(kW)
R410A
Airfl ow
(kg/h)
ΔP
R410A
(kg/h)
UTV-2
2000
2,86
1
1/2"
1"
16,4
342,0
33,30
13,4
235
15
UTV-3
4000
5,72
2
1/2"
1"
32,9
686,0
31,20
26,2
470
13
UTV-6
5500
8,36
2
1/2"
1-1/4"
47,0
980,0
12,60
37,1
664
5
UTV-8
7000
10,34
3
1/2"
1-1/2"
63,0
1335,0 21,00
50,8
910
14
* Air inlet temperature: 30ºC / 50%H.R.
** Air inlet temperature: 10ºC / 75%H.R.
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 neces-
sary, 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).
