Refrigerating Circuit Piping - emmeti XECO Serie Manual Instalación E Instrucciones Para El Uso De La Unidad Interna

6. EXTERNAL UNIT INSTALLATION

6.3 Refrigerating circuit piping

The connections for the refrigerating piping are sealed with a flared end
and flare-nut.
The outdoor unit contains the whole charge of the refrigerating system
and is equipped with valves with flare-nut connections and service
fitting connection.
The nominal diameter of the unions and the piping is:
Model Dircharge line
Ø inch
XECO-0913 1/4"
XECO-1213 1/4"
XECO-1813 1/4"
XECO-2413 1/4"
1/4"
XECO-1814D
1/4"
1/4"
XECO-2414T 1/4"
1/4"
Attention!
Use only new, annealed, degreased and deoxidated copper pipe of the
CU DHP for UNI EN 12735-1 type.
The copper pipe for plumbing services is not suitable.
6.3.1 Refrigerating lines
Path and bending of pipelines
- Define the pipeline path with the fewest possible bends.
- Bend the pipe with a suitable pipe-bending machine to avoid dangerous
flattening.
- For wide bends, use cylindrical surfaces for support, working very
delicately.
Attention!
Do not bend the copper pipe more than three times in the same place, to
avoid the danger of splitting it.
Cutting and flaring of the pipe
- Cut the copper pipe at the set length, using a pipe cutter; there is to be
a suitable straight section near the outdoor unit in order to enable the
flare to be remade if necessary.
- Remove any burrs from the end of the pipe, using a countersink. This ope-
ration is very important in order to obtain good quality flaring (Fig. A).
Countersink
Fig. A
Warning!
When you remove the burrs, keep the end of the pipe towards the bottom,
avoiding scraps from dropping inside it. The unions placed on the pipe
fittings of the units are to be immediately
removed before use, working in such a way that the cocks remain open
for the minimum time possible.
50
Suction line
Ø mm Ø inch Ø mm
6.35 3/8" 9.52
6.35 3/8" 9.52
6.35 1/2" 12.7
6.35 5/8" 15.88
6.35 3/8" 9.52
6.35 3/8" 9.52
6.35 3/8" 9.52
6.35 3/8" 9.52
6.35 3/8" 9.52
6.3.2 Insulating the pipelines
- Before carrying out the flaring of the pipe, it is essential to insulate the
pipe and then fit the nuts on the pipe (Fig. B).
Fig. B
Use an insulating tube in vapour-proof closed-cell polyurethane foam at
least 9 mm in thickness. (Fig. C).
Insulating
Fig. C
Wrap any uncovered areas with adhesive tape which has similar cha-
racteristics to the insulating material used for the pipeline.
6.3.3 Esecution Flaring
Carrying out the flaring properly is essential for the union to seal, it must
therefore be carried out with particular care and the appropriate flaring
tool. (Fig. D/E).
Flaring tool
Fig. D
Example of incorrect flarings
Inclined profile
Cracking
Fig. E
It is important to apply refrigerating oil to the mating surfaces of the
flared end and the fitting before they are joined.
This precaution prevents possible gas leakage.
Attention!
Use only synthetic oil in air conditioners which are charged with R 410 A
refrigerant.
GB GB
Damaged
surface
Uneven
thickness