3. Monitor the pressure gauge (Item 2). The pressure should decline gradually.
4. When the pointer of pressure gauge does not move and no nitrogen comes out of valve (Item
5), it means that no positive pressure exists in the waterbox.
5. Now it is safe to remove the flange cover (Item 6) or sealing cap (Item 9).
6. Close the valve (Item 5) and remove the warning tag (Item 1).
Shipment Form 2/3/7/9
All openings on the compressor, shells including evaporator and condenser, and oil reservoir are
closed and charged with nitrogen (2 psig to 3 psig). To remove the closures, sealing caps, or sealing
plug under pressure is extremely dangerous, and may cause severe injury or death to the operator
or people in site.
WARNING
Before trying to remove the closures, caps, or plugs on compressor and shells, relieve the pressure in
compressor, shells, or system that are charged with nitrogen by opening the valves on them slowly
until fully open.
WARNING
When relieving the pressure from compressor, shells, or system, conduct the nitrogen to outside to
prevent the potential risk of asphyxiation.
Shipment Form 1/10
The unit is shipped with refrigerant charge; it is not needed to relieve the pressure. So DO NOT try
to open any valves to relieve pressure or open closures, cap, or plugs on the compressor, shells,
and elsewhere on the system.
Reclaim the refrigerant in the system before any service activities being done to refrigeration
system. Fully relieve system pressure and then repair.
DANGER
The unit is charged with tons of refrigerant; once an uncontrollable leak is found, inform all of the
relevant people to evacuate from the building to prevent from asphyxiation.
Never touch the refrigerant that is leaking, especially the liquid refrigerant; this will cause severe
freezing to your hands or body.
Centrifugal Liquid Chillers12
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