Danfoss Optyma Trio Series, Application Manual, Page: 14 / 20

Installation and Operation
4.3.1 Fixation
Figure 7
4.4 Leak detection
4.5 Vacuum dehydration
4.6 Electrical Installation
• Never pressurize the circuit with oxygen or
dry air. This can cause fire or explosion.
• Do not use dye for leak detection.
• The use of nitrogen or the system’s own gas
is recommended.
• Perform a leak detection test in the entire
system.
• The maximum test pressure is 32 bar.
• When a leak is detected, repair the leak
and repeat the leak detection.
• Never use the compressor to empty the system.
• Connect a vacuum pump to the system’s lower
sides LP and HP.
• The vacuum in the system must reach at least a
complete 500 μm Hg (0.67 mbar).
• When the vacuum level is reached, keep it for a
few hours to guarantee the sealing of the system.
• After this stage, isolate the vacuum pump and
place the nitrogen with a pressure of 4 to 5 bar,
keeping the system at this pressure for 4 hours.
• If the pressure in the gauge connected to the
suction line and discharge lowers in this period,
locate the leak, perform the repair and restart
the vacuum procedure and check the leak again.
• Do not apply energy to the unit while the
system is under vacuum, as this might cause
internal damage.
• Switch off and isolate the main power supply.
• Make sure that the power supply can’t be
switched on accidentally during installation.
• All the electrical components must be selected
according to the local standards and according
to the unit’s requirements.
• Consult the wiring diagram supplied with the
installation manual for details on electrical
connections.
• Make sure that the power supply matches the
unit characteristics and that the energy source
is stable (nominal voltage ± 10% and nominal
frequency ± 2.5 Hz).
• Dimension the power supply cables according
to the unit data on voltage and current.
• Protect the power supply and ensure that the
grounding of the unit is done according to the
current standards.
• The unit is equipped with high and low pressure
switches, which directly shut off the power
supply to the compressor in case of activation.
The unit is also equipped with a phase sequence
relay to protect the unit against phase/
sequence loss / asymmetry and under voltage /
over voltage.
• Observe the correct phase sequence in the
condensing units which use three-phase
compressors.
• Determine the sequence using a phase gauge
to establish the sequences of the line phases L1,
L2 e L3.
• Connect the line phases L1, L2 e L3
corresponding to the terminals of the
compressor T1, T2 e T3 respectively.
Fixation of 4 “vibra-stop” type shock
absorbers included on the Danfoss
supply for the support on the floor
or laying base
14
FRCC.PC.053.A1.02
Application Guide