11
ENGLISH
EN
OUTDOOR UNIT
■
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 flare nuts and flare the end of the pipes.
• Check that no foreign bodies are inside the piping.
• Align the central of the connecting pipes and tighten the flare 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.
■
Maximum Piping Length
Unit size
MODEL
■
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 refr igerant 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.
- 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.
18
21
27
30
30
30
30
30
g/m
Refrigerant charge to be added per extra meter
of piping length when more than 5 meters.
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
10
10
10
10
(m)
Remark: 10m 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 R22/R407C
refrigerant that will be sufficient for an interconnecting piping
length of 5 meters.
Low pressure
High pressure
Manifold
Gas valve
Liquid valve
Pressure tap
Outdoor Unit
Indoor Unit
Gas Line
Liquid Line
R22/R407C
Installation
Minimum thickness 6 mm
Heat pump
Liquid
Cooling
Heat pump
(discharge)
Cooling
(suction)
Heat pump
(discharge)
Heat pump
Liquid
Cooling
GAS
Cooling
(suction)
J222
24/06/2005, 10:45 AM
11
