Emerson Copeland EazyCool ZX Series - 4.3 Rotation direction of Scroll compressors; 4.5 Checks before starting & during operation

20 C6.1.6/1108-0509/E
 Then invert the refrigerant cylinder if necessary to ensure only liquid refrigerant can be
charged into the system. This will be charged through the high-pressure side of the manifold
and ZX unit liquid service valve.
 The refrigerant cylinder should be weighed at this point to be able to record the final
refrigerant charge. Note that the standard receiver capacity is 4.4 kg of refrigerant for single-
fan units (ZXME20E to ZXME40E) and 6.2 kg of refrigerant for twin-fan units (ZXME50E to
ZXME75E) at 80% capacity and 32°C ambient temperature (R404A).
 Now open the liquid service valve (off the back seat). With a good vacuum in the system the
refrigerant cylinder inverted and at ambient you should not need to run the compressor at all.
 In colder ambient, it may be necessary to run the compressor in order to complete the
charging process. It is advisable to do this after the previous step, allowing the system/bottle
pressures to equalize and almost fully closing the receiver liquid outlet valve (front seat).
 The compressor can then be started, and the unit continued to be charged (with liquid
refrigerant through the liquid service valve). The quantity of charge should always be
measured.
 Turn off the unit and open the receiver outlet valve (which was almost fully closed earlier).
 The system needs to be operated down to its design evaporating temperature before you
can be sure the charge is correct. It is at this point that the normal refrigeration operational
checks can be carried out - such as checking the liquid line sight glass for violent bubbles
and the operating pressures.
 In the event that the system is still short of refrigerant, repeat from the last 4 steps onwards.
4.2.2 Oil charging procedure
Copeland EazyCool™ ZX condensing units are supplied only with a compressor oil charge. After
commissioning, oil level should be checked and recharged if necessary.
NOTE: The oil level should be approximately halfway up the sight glass.
Emerson Climate Technologies recommends charging the oil with one of the following oil types:
 Emkarate RL 32 3MAF
 Mobil EAL Artic 22 CC
Charging is done through the Schraeder valve located on the suction Rotalock valve.
4.3 Rotation direction of Scroll compressors
Scroll compressors, like several other types of compressors, will only compress in one rotational
direction. Direction of rotation is not an issue with single-phase compressors since they will
always start and run in the proper direction. Three-phase compressors will rotate in either
direction depending upon phasing of the power. Since there is a 50-50 chance of connecting
power in such a way as to cause rotation in the reverse direction, it is important to include
notices and instructions in appropriate locations on the equipment to ensure proper
rotation direction when the system is installed and operated.
4.4 Maximum compressor cycle
Maximum permitted starts per hour: 10.
4.5 Checks before starting & during operation
 Please check that all Rotalock valves are fully opened.
 Check that the electrical panel is closed.
 After starting and operation conditions are stabilised, we recommend to check the oil level in
compressor(s) and if needed to add oil to insure a sufficient oil level (halfway up the sight
glass).