13
Liebert
®
PDX, EconoPhase Version - UM - 265133 - 29.08.2019
2. Use sling and a 4
point lifting bar (not
supplied) to lift the unit
and place it on the oor
in the right position.
Downow Down position
Right position of the Downow Down unit respect the oor level.
All dimensions in mm
It is the responsibility of the customer to ensure the right support
below the unit; if necessary accessories are available.
See enclosure E.
Note:
Seal any gap between the unit and the oor edge with a gasket.
4 - Refrigeration connections
4.1 - Refrigeration pipeline connections
The air condensing units are delivered helium- pressurized at
2 bar.
CAUTION: The discharge operation of the room unit
pressurized with helium (at 2 bar) and the unbrazing
of the bottoms from the connections must be carried
out as last operations, immediately followed by the
connection and emptying of the whole system.
4.1.1 - General layout
1. In soft or hard copper.
The diameter required is stated in Tab. 6.
If the installer intends to use pipes of a larger diameter (e.g.
for long winding runs) then consult HPAC Technical Sales
Support.
Use as short refrigeration pipelines as possible to minimize
the total charge of refrigerant and the pressure drops.
Lay the horizontal gas pipes with 1% downward gradient
towards the refrigerant ow.
2. Reduce the number of bends, which must be of large radius,
to a minimum.
3. Insulate the piping as specied in Tab. 5. If the pipes are put
next to electrical cables it is advised to insulate them to avoid
damage to cable insulation.
4. There must be a minimum separation of 20mm between the
gas and liquid pipelines.
If this is not possible insulate both lines.
5. Support both horizontal and vertical pipes with vibration-
damping clamps (which include rubber gaskets).
Place these every 1.5 - 2 m.
Note:
In PX082, PX094, PX104, PX120, both circuits have tandem
compressors: each tandem compressor is composed of one scroll
compressor and one digital scroll compressor.
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