S&P UTBS PRO-REG Series, Manual

Page: 22 / 72

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