Startup; Startup Procedure - Emerson Liebert Challenger iCOM 3000 Operation & Maintenance Manual

2.0 S
TARTUP
Before beginning startup, make certain that unit was installed according to the instructions in the
installation manual, SL-11962. Verify that the fan shipping bolt has been removed, the check valve
has been installed (on air-cooled units), and that the scroll compressor is rotating in the proper
direction. All exterior panels must be in place with the front panel open.
Locate the startup form supplied with your unit documents. Complete the form during startup and
mail it to Liebert when startup is completed. Contact your Liebert supplier if you have any questions
or problems during unit installation, startup or operation.
WARNING
!
Arc flash and electric shock hazard. Open all local and remote electric power disconnect
switches, verify with a voltmeter that power is off and wear personal protective clothing per
NFPA 70E before working within the electric control enclosure. Failure to comply can cause
injury or death.
Potentially lethal voltages exist within this equipment during operation. Observe all cautions
and warnings on unit and in this manual.
The Liebert iCOM does not isolate power from the unit, even in the "Unit Off" mode. The only
way to ensure that there is NO voltage inside the unit is to install and open a remote
disconnect switch. Refer to unit electrical schematic.
2.1

Startup Procedure

1. Disconnect all power to the environmental control unit.
2. Tighten all electrical wiring connections that may have loosened during shipping (on electric
panel and at all major components, such as compressor, reheats, humidifier and motor).Retighten
according to values listed on component by component manufacturer.
3. Remove all line voltage fuses except the main fan fuses at the far right of the electric panel and
the Control Voltage fuses at the far left of the electric panel. For units supplied with circuit
breakers, open the circuit breakers instead of removing fuses.
4. Turn on power and check line voltage on main unit disconnect switch. Line voltage must be
within 10% of nameplate voltage.
5. Turn On main unit disconnect switch and check secondary voltage at transformer T1. Voltage at
T1 must be 24 VAC ±2.5 VAC (check at TB1-1 and TB1-8). If tolerance is exceeded, change the
transformer primary tap.
6. Push the On button. Blower will start.
7. If you do not want your unit to operate at factory default settings, set temperature and humidity
setpoints, alarms and other control functions. Refer to the iCOM User Manual SL-18835.
8. Stop the unit by depressing the On/Off button on the front display. Turn Off main unit disconnect
and main breaker.
9. Replace all fuses (or reset circuit breakers) that were removed in Step 3.
10. Restore power to unit; turn On the main unit disconnect switch.
11. Push the On button—putting the unit into operation.
12. Check the current draw on all line voltage components and match with serial tag.
13. Verify that the scroll compressor is rotating in the proper direction.
NOTICE
Risk of improper wiring/phase sequencing. Can cause backward compressor rotation, poor
performance and compressor damage.
Three-phase power must be connected to the unit line voltage terminals in the proper
sequence so that the scroll compressor rotates in the proper direction. Rotation in the wrong
direction will result in poor performance and compressor damage. Use a phase sequence and
motor rotation sensor to ensure that the three-phase power is correctly connected and that the
compressor is rotating properly.
5

Startup

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Liebert ® Challenger 3000