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GENERAL STARTUP INSTRUCTIONS
Method of Charging
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Use Manifold Gauges and charging hoses for CO2 only.
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Use only refrigeration quality R744.
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Use a refrigerant scale to measure correct quantity charged into the system from the
R744 cylinders.
– Oil Charging must be done through the liquid service line during vacuum operation
–
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.
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Control that the expansion valve at the evaporator(s) is active . Control both
electronic pressure transmitters and manifold Gauges for correct pressure readings.
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As vapor is drawn from the R744 cylinders, pressure and temperature inside the
cylinder will decrease. Frosting on the bottom exterior of the cylinder is evidence
that some R744 liquid evaporated inside. The reduction in pressure also causes a
slower flow rate of vapor into the system. Once the flow from the cylinder has
slowed to a low level, the cold cylinder should be disconnected and allowed to
warm. After the cylinder warms, additional R744 can be removed. In the meantime,
another warm tank can be connected to the system to continue the charging process.
–
Add liquid R744 only into the liquid line.
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Do not charge liquid on compressor suction line. Only Gas.
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Overfilling the system may cause malfunction and compressor damage.
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Sight glass does not indicate correct R744 level if 100% full. Control superheat
management is inside min-max superheat settings.
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Simulate transcritical conditions when charging in low ambient conditions by
blocking the air flow into the condenser/gas cooler in order to control correct
charging level.
–
Run the unite and simulate thermostat cut off, defrosting cycle or manual pump down
in order to control correct operation and R744 charge.
In case of leakage detection and repair: empty the system completely and refill
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according to the first filling charge.
¾ level in the sight glass is ok.
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