Starting Up & Operation; Strength Pressure Test; Tightness/Pressure Test; Preliminary Checks - Pre-Starting - Emerson Copeland Scroll ZRH49KJE Application Manuallines

5 Starting up & operation
WARNING
Diesel effect! Compressor destruction! The mixture of air and oil at high
temperature can lead to an explosion. Avoid operating with air.
IMPORTANT
Oil dilution! Bearing malfunction! Turn the crankcase heater on 12 hours
before starting the compressor.
5.1

Strength pressure test

The compressor has been strength-tested in the factory. It is not necessary for the customer to
strength- or leak-test the compressor again although the compressor will normally be exposed to
the testing made as part of system testing.
5.2

Tightness/pressure test

CAUTION
Consider personal safety requirements and refer to test pressures prior to
test.
CAUTION
System contamination! Bearing malfunction! Use only dry nitrogen or
dried air for pressure testing.
WARNING
System explosion! Personal injuries! DO NOT USE other industrial
gases.
If using dry air do not include the compressor in the pressure test – isolate it first. Never add
refrigerant to the test gas (as leak indicator).
5.3 Preliminary checks – Pre-starting
WARNING
Vacuum operation! Compressor damage!
Discuss details of the installation with the installer. If possible, obtain drawings, wiring diagrams,
etc.
Prior to commissioning the system, the low-pressure switch has to be set and its operation
tested otherwise when starting up if there is a shortage of refrigerant the scroll compressor can
pull a high vacuum that will severely damage the motor and compressor.
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
5.4

First start

It is good practice to stop the compressor after 15 minutes running on full or part load then check the
oil levels in both sight glasses. The oil levels should be half way up the sight glasses. This is to
ensure that any oil carried over into the system is being returned to the compressor and the
compressor is not short of oil.
12 C6.2.7/0302-1007/E