D
L
L
H
NOTE
Unit size
g/m
07
15
09
15
12
15
18
40
25
40
35
40
40
40
45
60
55
60
65
60
Insulation
Heat pump
Liquid
Cooling
Cooling
(suction)
Heat pump
(discharge)
Heat
pump
Liquid
GAS
Cooling
(suction)
Cooling
Low pressure High pressure
Manifold
Gas valve
Liquid valve
Pressure tap
Outdoor unit
Gas line Indoor unit
Liquid line
R22 / R407C
Where the difference in elevation between the indoor unit
and the outdoor unit is greater than 5 meters, install an
oil trap every 5 meters.
The suction line must have a 2% gradient up to the
compressor on horizontal sections.
Where piping lengths are unusually long and include a
large number of oil traps, it may be necessary to adjust
the compressor oil charge.
Refrigerant charge to be added per extra meter
of piping length when more than 7.5 m.
Refrigerant piping connections
(FLARE connections)
To avoid alteration of unit capacities, check that piping
lengths and changes in elevation are kept to a strict
minimum.
Before connecting the refrigerant lines, follow the procedures
below (if pre-charged connection lines are not supplied):
Select copper pipe diameters according to the size of
unit to be installed.
Install the refrigeration lines, checking that no foreign
bodies get inside the piping.
Install the flare connectors and flare the ends of the pipes.
Heat pump
(discharge)
Evacuate the piping. This operation, which should last at
least 15 minutes or even longer if there are large piping
lengths and changes in elevation, should be followed by a
leak test.
To this effect, when the piping has been evacuated, close
the pressure gauge tap, note the value on the gauge, then
wait for 15 minutes. If the needle moves, there is a leak in
the system. Make the necessary adjustments or repairs
and repeat this procedure until the needle no longer moves.
Open the service valves and top up the refrigerant charge
if necessary.
Minimum thickness 6 mm
REFRIGERANT CIRCUIT CONNECTIONS
PIPE LENGTHS
Maximum piping lengths
MOC-MOH
D (m)
L (m)
H (m)
07
12
15
10
09
12
15
10
12
15
18
12
18
15
18
12
25
22
25
20
35
22
25
20
40
26
30
24
45
26
30
24
55
26
30
24
65
26
30
24
Make piping runs as short as possible and avoid all unnecessary
changes in direction or elevation.
To prevent heat loss, the two lines must be insulated
separately.
Use an appropriate bending tool to form curves and avoid
flattening the refrigerant tubes.
Fix piping with pipe clamps and check that any eventual pipe
vibrations cannot be transmitted to the building structure.
Use refrigeration quality piping only with an operating pressure
rating of at least 30 bars. Never use ordinary <<plumbing>>
quality piping : you MUST use special deoxidized, dehydrated,
refrigerant quality copper piping.
