Technical information
16 C6.1.7/0609-1110/E
4 Starting up & operation
Before commissioning, ensure that all Rotalock valves and other valves on the unit are fully
opened.
4.1 Charging procedure
4.1.1 Refrigerant charging procedure
It is recommended to charge the unit with refrigerant into the receiver, via the Rotalock service
valve.
Alternatively, it could also be done by charging gas through the suction valve of the compressor.
The charging procedure should follow the rules of art of refrigeration.
Recommendation is to break vacuum in the system with partial charge of refrigerant, then start
the system.
For the charge adjustment it is recommended to check the liquid sight glass just before the
expansion valve and adjust further bulling.
4.1.2 Oil charging procedure
Copeland Scroll Digital™ Receiver units HLR are supplied only with a compressor oil charge.
After commissioning, the 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.
Two-compressor Digital Receiver units HLR equipped with an oil separator are delivered with a
small oil can to add oil, if necessary.
4.2 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.
Observing that suction pressure drops and discharge pressure rises when the compressor is
energized allows verification of proper rotation direction. 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) but oil may be lost. After several minutes of
operation in reverse, the compressor's protection system will trip due to high motor temperature.
However, 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. Therefore, once the correct
phasing is determined for a specific system or installation, connecting properly phased power
leads to the identified compressor terminals in the electrical panel will ensure proper rotation
direction.
4.3 Maximum compressor cycle
Maximum permitted starts per hour: 10.
It can be controlled via the EC2-552 controller (parameter t3, t4 and / or t5).