75
COMMISSIONING
Rotary Version
– RECOMMENDED Oil: PAG VG100 or PAG100 FUCHS
– This oil (of the PAG type) is not totally miscible with refrigerant.
–
The oil charge of the oil separator must be done by the installer, using the VA11
service valve according to the quantities presented in the table below. The rest
of the oil charge must be done using the suction service valve VA12, during the
vacuum step.
MT compressors
2 x DY45
2 x RY100
3 x RY100
4 x RY100
5 x RY100
Configuration
INDOOR
OUTDOOR
INDOOR
OUTDOOR
INDOOR
OUTDOOR
INDOOR
OUTDOOR
INDOOR
OUTDOOR
Minimum initial oil charge in
the oil separator
2.8L
0.5L
2.8L
0.5L
2.8L
0.9L
2.8L
0.9L
2.8L
0.9L
–
Some oil must be added in order to have an oil/refrigerant ratio in kg around
5% in the installation (in addition to the oil initially in the compressors and to
the minimum oil charge in the oil separator). Refer to appendix 2.
– In all cases the oil filling must be done while the machine is under vacuum and
using a vacuum pump.
– Once these operations have been carried out, the operation of the vacuum pump will
be maintained for at least 1 hour in order to evacuate the air and the moisture
possibly contained in the oil
– For the use of another oil, we advise you to contact PROFROID or the manufacturer
of the compressor. However, we would like to remind you that the oil return depends
not only on the nature of the oil, but also on the configuration of the refrigeration
circuit (slope, rising, siphon and counter siphon) and speeds of circulation,
especially in low pressure, which must be in first approach: 4m / s in horizontal
and> 7m / s in vertical
Refrigerant charge
– Execute refrigerant charging immediately after evacuation.
– Charge refrigerant R744 (CO2 refrigerant).
– Do not mix with other refrigerant.
– Always use refrigerant grade R744, moisture content must be below 10 ppm.
– Use Manifold Gauges and charging hoses for CO2 only.
– Use only refrigeration quality R744.
– Use a refrigerant scale to measure correct quantity charged into the system from the
R744 cylinders.
– Close the vacuum pump and break the vacuum with vapor R744 until 7-10Bar to
avoid dry ice formation. Dry ice may block hoses and pipes and charging will be
impossible. Charge vapor in both suction and liquid line. Control that the expansion
valve at the evaporator(s) is open. Control both electronic pressure transmitters and
manifold Gauges for correct pressure readings.
