Operation
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3.9.1 Calculation of Next Maintenance and Diagnostics
If the unit includes any of the following components, they are included in the calculation:
• Fan(s)
• Compressor 1
• Compressor 2
• Electric Heaters
• Humidifier
For each component, the next maintenance will be calculated from the following parameters:
• Standard service interval (1, 2 or 4 times a year) (to be set)
• Working hours (counted)
• Number of starts (counted)
• Average running time (calculated)
• Optimum number of starts per hour (to be set)
• Maximum number of starts per hour (to be set)
• Maximum bonus to enlarge time to next maintenance (to be set)
• Maximum penalty to reduce time to next maintenance (to be set)
Calculating Unit Wellness
Liebert iCOM keeps tabs on the condition of a cooling unit, determining its wellness and projecting
when service will be needed, for the entire unit as well as for individual components. This assists in
scheduling maintenance calls and helps pinpoint components likely to require service.
Liebert iCOM displays a graphic for needed maintenance. It begins with the standard maintenance
interval—12 months, six months or three months—and adjusts that based on its calculation of compo-
nents’ wellness.
To calculate wellness, Liebert iCOM keeps a running total of component working hours and the num-
ber of times it has been started. Liebert iCOM relates that data to the optimum/maximum starts per
hour. Accordingly, Liebert iCOM will increase or decrease the time before the next service call will be
needed.
The more frequently a component starts, the sooner it is likely to need maintenance. If, for example, a
unit’s fan runs continuously, but it’s compressor starts and stops often, Liebert iCOM records that
and calls for maintenance based on the compressor’s wellness factor.
Alarms and warnings, such as clogged filters or high or low pressure, reduce the time till the next
maintenance to zero. If the alarm is cleared and reset, Liebert iCOM recalculates wellness. It begins
with the pre-alarm maintenance time and factors in the alarm.
Parameters for Next Maintenance Calculation
General Maintenance Settings
•
Maintenance Frequency
—can be set as one to 12 months or to zero, which disables mainte-
nance calculation
•
Max. Bonus
—increases the time to next maintenance with the set value, if all components run
optimally (number of starts, average running time)
•
Max. Penalty
value
—decreases the time to next maintenance with the set value, if some compo-
nents run in non-optimum way (number of starts, average running time)
•
Last Maintenance
—date can be set from service-engineer; informational
•
Service-Engineer
—name of the service engineer; editable
•
Reset
—puts all counters of all components, such as (motor, compressors, heaters and humidifier),
at zero and starts a new maintenance calculation (reset to be done after maintenance)
Summary of Contents for Liebert Challenger 3000
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