Preliminary Checks - Pre-Starting; Charging Procedure; Run-In Time; Initial Start-Up - Emerson Copeland Scroll ZR24KRE Application Manuallines

axially seal with the scroll set, with the higher pressure on the floating seal. Consequently, until the
pressures equalise, the floating seal and scroll set can be held tightly together.
The highest demands are placed on the leak-proof design of the installation and on the leak testing
methods – please refer to EN 378.
Preliminary checks – Pre-starting
5.4
Discuss details of the installation with the installer. If possible, obtain drawings, wiring diagrams, etc.
It is ideal to use a check-list but always check the following:
▪ Visual check of the electrics, wiring, fuses etc.
▪ Visual check of the plant for leaks, loose fittings such as TXV bulbs etc.
▪ Compressor oil level
▪ Calibration of HP & LP switches and any pressure actuated valves
▪ Check setting and operation of all safety features and protection devices
▪ All valves in the correct running position
▪ Pressure and compound gauges fitted
▪ Correctly charged with refrigerant
▪ Compressor electrical isolator location & position

Charging procedure

5.5
CAUTION
Low suction pressure operation! Compressor damage! Do not operate
with a restricted suction. Do not operate with the low-pressure limiter bridged.
Do not operate compressor at pressures that are not allowed by the operating
envelope. Allowing the suction pressure to drop below the envelope limit for
more than a few seconds may overheat scrolls and cause early drive bearing
and moving parts damage.
Prior to charging or re-charging, the system must be leak- and pressure-tested with appropriate
purging gas.
Ensure that the refrigerant system is grounded prior to charging with refrigerant.
The system shall be liquid-charged through the liquid-receiver shut-off valve or through a valve in
the liquid line. The use of a filter drier in the charging line is highly recommended. Systems shall be
liquid-charged on both the high and low sides simultaneously to ensure a positive refrigerant
pressure is present in the compressor before it runs. The majority of the charge shall be placed in
the high side of the system to prevent bearing washout during first-time start on the assembly line.
Extreme care shall be taken not to overfill the refrigerant system.

Run-in time

5.6
Scroll compressors exhibit a slight decrease in input power during the initial running period.
Published performance ratings are based on calorimeter testing which is carried out after run-in.
Therefore, users should be aware that before the performance specified by EN 12900 is achieved
the compressor needs to be run in. Recommended run-in times for ZR*KRE compressors to attain
the published performance are 16 hours at the standard conditions.

Initial start-up

5.7
CAUTION
High discharge pressure operation! Compressor damage! Do not use
compressor to test opening setpoint of high-pressure cut-out. Internal parts
are susceptible to damage before they have had several hours of normal
running in.
Liquid and high-pressure loads could be detrimental to new bearings. It is therefore important to
ensure that new compressors are not subjected to liquid abuse and high-pressure run tests. It is not
good practice to use the compressor to test the high-pressure switch function on the production line.
The switch function can be tested with nitrogen prior to installation and wiring can be checked by
disconnecting the high-pressure switch during the run test.
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