11
Adding Oil
The simple and ideal way to add oil is to pump the oil into the suction side when the unit is running. Discharge pressure from the unit or
refrigerant pressure from a cylinder can be used to force oil into the suction side. The oil will go directly into the compressor and the level
increase will be immediate.
NEVER CLOSE THE UNIT SUCTION VALVE AND USE THE COMPRESSOR TO SUCK OIL FROM A CONTAINER THAT IS AT ATMOSPHERIC
PRESSURE. THIS COULD DESTROY THE SCROLL COMPRESSOR IN A MATTER OF SECONDS.
Tools required: Manifold gauge set and hoses, oil tank of ~ 1 litre volume with suitable connections, oil, refrigerant.
Qualified Refrigerants And Oil
REFRIGERANT
OIL
R404A/507
Emkarate RL 32 3MAF Mobil EAL Artic 22 CC
R22
Suniso 3GS
Oils are pre-charged in both compressor and oil separator. Total oil volume (liter)
for each unit is shown in the table below:
ZX
ZXD
ZXL
Model
BOM
Model
BOM
Model
BOM
401
451
ALL
ALL
ZX0200/E
1.18
1.68
ZXL0200/E
1.06
ZX0250/E
1.33
1.83
ZXL0250/E
1.06
ZX0300/E
1.33
1.83
ZXL0300/E
1.06
ZXL0350/E
1.74
ZX0400/E
1.83
2.33
ZXD0400/E
1.74
ZXL0400/E
1.74
ZX0500/E
1.83
2.33
ZXD0500/E
2.27
ZXL0500/E
1.74
ZX0600/E
1.66
2.16
ZXD0600/E
2.27
ZXL0600/E
2.27
ZX0750/E
1.66
2.16
ZXD0750/E
2.27
ZXL0750/E
2.27
ZX0760/E
1.66
2.16
Scroll Compressor Rotation Direction
Rotation Direction of Three Phase Scroll 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. Verification of proper rotation direction
is made by observing that suction pressure drops and discharge pressure rises when the compressor is energized. Reverse rotation of a
scroll compressor also results in substantially reduced current draw compared to specification sheet values. Suction temperature will be
high, discharge temperature will be low and the compressor may be abnormally noisy. There is no negative impact on durability caused
by operating three phase Copeland Scroll compressors in the reversed direction for a short period of time (under one hour). After several
minutes of operation in reverse, the compressor’s motor protection system will trip the compressor off. If allowed to repeatedly restart
and run in reverse without correcting the situation, the compressor will be permanently damaged. All three phase scroll compressors are
identically wired internally. As a result, once the correct phasing is determined for a specific system or installation, connecting properly
phased power leads to the same terminals will maintain proper rotation direction.
Brief Power Interruptions
Brief power interruptions (less than ½ second) may result in powered reverse rotation of single-phase refrigeration scroll compressors.
High-pressure discharge gas expands backward through the scrolls at power interruption causing the scroll to orbit in the reverse
direction. If power is reapplied while this reversal is occurring, the compressor may continue to run noisily in the reverse direction for
several minutes until the compressor internal protector trips. This has no negative effect on durability. When the protector resets, the
compressor will start and run normally.
Maximum Compressor Cycle
Maximum permitted starts per hour is 10.
Check Before Starting & During Operation
Both valves should be fully opened on the liquid line, in order to prevent trapping liquid.
•
Check that all valves are fully opened.
•
After starting and operation conditions are stabilized, it is recommended to check oil level in the compressor(s) and see if there
is a need to add oil to ensure a sufficient oil level (halfway up the sight glass).
