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Application Guide
4.7 Refrigerant and oil
charge
4.8 Verification before
operating
4.9 First start-up
4.10 Verification of the unit
while operating
Installation and Operation
• Use individual protection equipment (IPE)
such as safety glasses and gloves.
• Never start the compressor under vacuum.
Keep the compressor switched off.
• Before performing the refrigerant charge,
verify if the oil level is between ¼ and ¾ on the
compressor oil display. If necessary, add oil to
the compressors, refer to the compressor's label
for oil type.
• Only use the coolant for which the unit was
designed for.
• Perform the refrigerant charge in liquid phase
into the condenser and in the liquid receiver.
• Use safety devices according to locally
applicable regulations and security standards.
• Verify if all electrical connections are attached
correctly and in accordance with the local
regulations.
• Never switch on the unit without having
performed a refrigerant charge .
• All service valves must be in the open position.
See figure 5.
• Verify if the power supply is adequately
connected.
• Verify if the crankcase heater is working.
• Verify if the fan can rotate freely.
• Verify if high and low pressure are balanced.
• Energize the unit and verify the conformity of
the wiring, the tension in the terminals and the
phase sequence.
• Check the rotation direction of the fan. The air
must flow from the condenser to the fan (air
flow from bottom to top).
• Check the high pressure stabilization and the
power supply stability.
• Check the suction overheating to reduce the risk
of the return of liquid to the compressor.
• Observe the compressor oil level in the
beginning and during the operation to confirm
that the oil level remains visible.
Make sure to perform a slow refrigerant
charge until it reaches 4-5 bar in systems
with R404A/507.
• Never put liquid refrigerant through the
suction line.
• Never use additive or oil mixtures.
• The remaining charge is carried out until the
installation has reached a stable nominal
condition level during the operation.
• Never leave the filling cylinder connected to
the system.
• Keep the crankcase heater switched on for at
least 12 hours before the system start-up, for the
guarantee of proper lubrication and elimination
of the liquid refrigerant from the compressor's
crankcase.
• The potential reverse rotation of a three-phased
compressor can be detected by no pressure
increase, an abnormal sound level of the
compressor and a lower energy consumption
than the one expected. In this case, immediately
switch off the unit and connect the phases to
their appropriate terminals.
• If the direction of rotation is correct, the indication
of low pressure on the low pressure gauge must
display a decreasing pressure and the indication
of high pressure in the high pressure measurer
must display an increasing pressure.
• The electronic buoys must comply with the
indication.
• Verify all tubing with respect to unusual
vibration. The movements exceeding 1.5mm
require corrective measures, as the use of
fixation supports in the tubing.
• Before leaving the installation site, perform
a general inspection of the installation on
cleanliness, detection of noise and leakage.
• Record type and amount of refrigerant charge,
as well as operation conditions as reference for
future inspections. Use data check sheet
15
FRCC.PC.053.A1.02
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