Preparing Of The Refrigerating Pipes; Connecting The Internal Unit; Connecting The External Unit - Ariston Nuos Split Flex 150L Manual

Heat pump water heater – TECHNICAL INFORMATION FOR INSTALLERS
f) Pipe reamer;
g) Leak Detector for R134a, a leak detector is used exclusively for HFC refrigerants. It must have a high detection
sensitivity, minimum 5g per year.

4.5 Preparing of the refrigerating pipes

WARNING! Before carrying out any installation check the following:
a) Use only copper tubes for air conditioners type (copper tubing for the refrigeration and the conditioning) or copper
pipes with proper insulation (at least 6 mm thick), suitable for use with R134a;
b) Never use piping with a thickness less than 0.8 mm;
c) Provide a path of the pipes as short and simple as possible (maximum length 15 m, 3 m maximum of height
difference if the external unit is above the internal unit, viceversa 10 m maximum if external unit is under the internal
unit). Do not provide a path that may obstruct the access to the cap and the removal of flange. See Figure 9.
d) Protect the pipes and cables to avoid damage;
WARNING! The refrigerant lines, and fittings for connection must be insulated to avoid
dangerous burns, loss of performance and product malfunction. Ensure the insulating sheath
of the tubes through fastening clamps to prevent it from moving.
Remove the locking of the tubes shortly before making the connection: absolutely must prevent moisture or dirt from
entering. If a pipe is bent too often becomes hard: Do not bend more than 2 times in the same section. Unwind the hose
unwound without pulling (see fig. 8).

4.6 Connecting the internal unit

a) Shape the pipes according to the path;
b) Remove the brass plug on the indoor unit and store them (check that no impurities are left);
c) Cut the pipe to the fixed length, with a pipe cutter, avoiding any deformation;
d) Remove burrs with pipe reamer avoiding to get impurities inside (keep down the tube);
e) Insert the threaded brass flare nuts on the pipes in the correct direction;
f) Insert the tube into the flaring tool and make the flange at the end of the connecting pipe, as indicated in the table
(see fig. 10):
ø NOMINAL
1/4
3/8
After confirming that there are no wrinkles or tears on the flare, connect the pipes using two spanners, being careful
not to damage the pipes. If the force is insufficient, then there will be leaks. Although the force is excessive, there may
be losses because it is easy to damage the flange. The safest method is to tighten the connection by using a spanner
and a torque wrench, in this case use the table:
ø Pipe
6,35 mm (1/4")
9,5 mm (3/8")
We recommend leaving a few inches of copper pipe, for any subsequent operations in near the taps.

4.7 Connecting the external unit

Remove the gas connections plastic cover, screw the flare nuts to connect the outdoor unit with the same method
described for the internal unit.
ø EXTERNAL THICKNESS mm
6.35
9.52
Tightening torque [Kgf x cm]
160 – 200
300 – 350
DIMENSION "A" mm
FLARING TOOL
0.8 0 ÷ 0.5
0.8 0 ÷ 0.5
Corresponding force (with 20 cm spanner)
Wrist force
Arm force
42
DIMENSION "L" mm
FLARING TOOL
1.8 ÷ 2.0
2.5 ÷ 2.7