Charging Procedure; Initial Start-Up; Minimum Run Time - Emerson Copeland 4MTL-05 Application Manuallines

5.4

Charging procedure

CAUTION
Low suction pressure operation! Compressor Damage! Do not operate
with a restricted suction. Do not operate with the low-pressure cut-out bridged.
Do not operate compressor without enough system charge to maintain at least
6 bar absolute suction pressure. Allowing the absolute pressure to drop below
6 bar for more than a few seconds might cause CO
block valves or pipes.
CAUTION
Low moisture content! Corrosive impact on refrigeration system! Use
only high-dried CO
Charge the system with vapour CO
formation. A gaseous pre-charge of 10 bar in the whole system is common practice. Then continue
charging with liquid CO
through a valve in the liquid line. The use of a filter drier in the charging line is highly recommended.
As there may be several valves in the system it is recommended to charge on both the high and low
sides simultaneously to ensure a sufficient pressure is present in the compressor before it runs. The
majority of the charge should be placed in the high side of the system to prevent bearing washout
during first-time start.
5.5

Initial start-up

CAUTION
Oil dilution! Bearing malfunction! It is important to ensure that new
compressors are not subjected to liquid abuse. Turn the crankcase heater on
12 hours before starting the compressor.
CAUTION
High discharge pressure operation! Compressor damage! Do not use
compressor to test opening setpoint of high-pressure cut-out.
The compressor must be equipped according to our technical documentation considering the
application intended. Make sure this requirement is met before start-up.
For brazing connections where dissimilar or ferric metals are joined a silver alloy rod with a minimum
silver content of 34 % shall be used being either flux-coated or with a separate flux.
Bolt torque settings are listed in Appendix 2.
With the exception of rubber-coated metallic gaskets (Wolverine), all gaskets and O-rings should be
oiled before fitting.
NOTE: A compressor should never be operated outside its approved application range!
Check the corresponding data sheet. To avoid motor damage, NEVER start the compressor
or carry out high-potential testing when the compressor is under vacuum.
5.6

Minimum run time

Emerson recommends a maximum of 10 starts per hour. The most critical consideration is the
minimum run time required to return oil to the compressor after start-up.
32
quality.
2
up to a minimum absolute pressure of 6 bar to prevent dry ice
2
. The system should be charged through the liquid-receiver shut-off valve or
2
solidification which would
2
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