Component Operation And Maintenance; System Testing; Environmental Control Functions - Emerson Liebert Challenger 3000 Operation & Maintenance Manual

7.0 C
OMPONENT
7.1

System Testing

7.1.1

Environmental Control Functions

The performance of all control circuits can be tested by actuating each of the main functions. This is
done by temporarily changing the setpoints.
Cooling
To test the cooling function, set the setpoint for a temperature of 10°F (5°C) below room temperature.
A call for cooling should be seen and the equipment should begin to cool. A high temperature alarm
may come On. Disregard it. Return setpoint to the desired temperature.
Heating
Reheat may be tested by setting the setpoint for 10°F (5°C) above room temperature. A call for heat-
ing should be seen and the heating coils should begin to heat. Disregard the temperature alarm and
return the setpoint to the desired temperature.
Humidification
To check humidification, set the humidity setpoint for an RH 10% above the room humidity reading.
For infrared humidifiers, the infrared element should come On. Steam generating humidifiers should
click immediately as it energizes. After a short delay, the canister will fill with water. The water will
heat and steam will be produced. Return the humidity setpoint to the desired humidity.
Dehumidification
Dehumidification can be checked by setting the humidity setpoint for an RH 10% below room relative
humidity. The compressor should come On. Return humidity setpoint to the desired humidity.
Electric Panel
The electric panel should be inspected for any loose electrical connections.
WARNING
!
Risk of electric shock. Can cause injury or death.
The Liebert iCOM microprocessor does not isolate power from the unit, even in the "Unit Off"
mode. Some internal components require and receive power even during the "Unit Off" mode
of Liebert iCOM control.
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.
Be sure that all power has been disconnected from the unit before attempting to tighten any
fittings or connections.
O M
PERATION AND AINTENANCE
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Component Operation and Maintenance