Refrigerant Side Evacuation; Draining Refrigerant Circuit - GEA RedGenium Operating Instruction

Maintenance
Maintenance work
A sure sign of air or other inert gases is that the temperature gap between con-
densing temperature (from condensing pressure) and heating agent outlet is wid-
ening. Contamination of the circuit with air or other gases is caused by careless-
ness during evacuation, filling oil or contaminated refrigerant
If this gas obstructs further operation:
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There are several ways of venting the system. The air or the NH
drained into tanks filled with water at the vent valves of the suction filter during
standstill of the heat pump.
If air is contained in the mixture, the venting NH

10.4.10 Refrigerant side evacuation

Note: Shut off the oil pump (if present) during evacuation!
The purpose of evacuating the system is to remove air and moisture from the
refrigerant circuit.
Evacuation is required:
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Evacuate the product using a vacuum pump. The compressor must not be used
for evacuation.
During evacuation, all affected parts of the circuit should be at least at room tem-
perature as cold parts hinder the removal of moisture.
If there is still any moisture in the product, this will lead to a rise in pressure.
Evacuation must continue until the pressure no longer increases. For a pressure
compensation, it is necessary for the ambient temperature to remain constant.

10.4.11 Draining refrigerant circuit

Open the stop valve (2330) carefully to drain any existing oil out of the evapora-
tor.
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Shut down the product
Close the pressure valve
Lower the refrigerant level in the liquid line down to the stop valve (item 2010)
level by manually opening the injection valve
Close stop valve
Drain air/ NH mixture into water-filled tank (dispose of properly)
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Evacuate condenser
Open valves
after intervention in the refrigerant circuit and elimination of leaks,
before start-up/restarting.
Danger
You must observe the safety rules of working with the refrigerant ammonia!
► Keep the safety equipment handy (protective breathing mask)!
► Working only together with a 2nd person!
air mixture is
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is absorbed by water.
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19.12.2019