11
ENGLISH
EN
OUTDOOR UNIT
■
Maximum Piping Length
■
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
fl
are connectors and
fl
are the ends of the
pipes.
- Evacuate the piping. This operation, which should last
at least 15 minutes if there are large piping lengths and
changes in elevation, should be followed by a leak test.
Refrigerant charge to be added per extra
meter of piping length when more than 7.5
meters per unit.
Unit size
MODEL
18
21
27
30
g/m
30
30
30
30
For example: If there are 3 indoor units, the additional refri-
gerant charge = [(Piping length of indoor unit A+B+C)-5x3]x30.
NOTE
Unit size
18
21
27
30
(m)
20
20
20
20
Remark: 10 m for each indoor unit.
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 to
compressor charge.
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.
This unit is shipped complete with a charge of R410A refrigerant
that will be suffi cient for an interconnecting piping length of 7.5
meters.
Low pressure
High pressure
Manifold
Gas valve
Liquid valve
Pressure tap
Insulation
Minimum thickness 6 mm
Heat pump
Liquid
Cooling
Heat pump
(discharge)
Cooling
(suction)
Heat pump
(discharge)
Heat pump
Liquid
Cooling
GAS
Cooling
(suction)
Outdoor Unit
Indoor Unit
Gas Line
Liquid Line
R410A
■
Fixing and Piping
•
Piping must be performed by qualified personnel
according to good refrigeration systems practices.
•
Piping materials and insulation materials must be of
refrigerant quality.
•
Select the pipe diameters according to the size of unit
and cut the pipe to design length by using pipe cutter.
•
Install
the
fl
are nuts and
fl
are the end of the pipes.
•
Check that no foreign bodies are inside the piping.
•
Align the central of the connecting pipes and tighten the
fl
are nut.
•
Fix piping with pipe clamps and check that any pipe
vibrations cannot be transmitted to the building
structure.
•
Connect the pipe correctly.
•
Do not apply the excessive torque.
•
Use an appropriate bending tool to form curves and
avoid over-tightening the refrigerant tubes.
•
To prevent heat loss, the two lines must be insulated
separately.
J287-EN.indd 11
J287-EN.indd 11
07.03.2006 9:30:14 Uhr
07.03.2006 9:30:14 Uhr
