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Installation, System processing and commissioning
Utmost care must be taken while handling the scroll condensing unit.
Please go through the contents below to ensure proper handling:
Leak test, evacuation, and charging
The following assumes the condensing unit to be leak-free on arrival. That is an important step before
proceeding with the following.
Leak test is particularly important for field-connected systems. Typically, field systems lose as much as
20%–30% of their refrigeration charge annually. This is not only an unnecessary expense but also
damages the environment. Compressor oil can be lost at the same time as refrigerant and eventually
lead to compressor failure. (Time spent on leak test will eventually reduce the time spent on the
evacuation process).
Ensure that all service valves are open during the leak test process. It is important to recheck all joints
within the unit as well as the external joints.
Initial pressure test (by vacuum and nitrogen)
Step-by-step
1.
Use a 4-port gauge manifold with 3/8” hose and connections to the vacuum pump. The
vacuum gauge does not have to be connected for this part of the process.
2.
Connect the gauges to service ports provided on receiver valve and suction tube.
In order to remove any non-condensable that may have entered the system during
installation, follow these steps:
*
Start the vacuum pump. The evaporator fan should be running and the compressor
crankcase heater is energized at this point. This will involve powering up the unit so it is
important to disconnect the live feed wire to the compressor contactor (so the compressor
cannot run and the crankcase heater can be energized).
3.
Open both valves on the manifold and then open the main vacuum valve on the pump. Run
the system until the vacuum level of -0.85 bar (as read on manifold gauge) is achieved.
4.
Shut off the main vacuum pump valve. Check for vacuum rise using the manifold compound
gauge. A rise would indicate a large leak.
5.
If vacuum holds for 10 minutes, break vacuum with nitrogen and pressurize to 20 bar. Check
for leaks and repair leakage.
Содержание COPELAND F Series
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