Vertiv Liebert CR012 - 4.2 Routine Maintenance and Inspection (Half -Yearly); 4.3 Self-Diagnosing Functions; 4.4 Maintenance of Electrical Control utilities

Liebert CR012 Precision Air Conditioning User Manual
52 Chapter 4 Maintenance & Troubleshooting
4.2 Routine Maintenance and Inspection (Half -Yearly)
Following is a checklist (Refer Table 4-2) of the items and functions that need to be checked bi-annually to ensure a
smooth operational flow and check the functionality as well as the wear-and-tear of the components in the Liebert
CR012 air conditioners.
Table 4-2
Components
Item
Remark
Air Filter
Check for clogging or damage
Check the filter clogging switch
Clean the filter
Fan
The Fan blades are not distorted
The bearings are not worn out
Check and fasten the circuit connections
Compressor
Check for leakage
Listen to the operation sound, observe the operation vibration
Check and fasten the circuit connections
Air-cooled condenser
(if used)
Check the fins cleanness
The fan base should be firm
The fan vibration absorber is not deteriorated or damaged
The SPD board should be effective (in the seasons, when the storms are common, the SPD
board should be checked once a week)
Check the voltage regulating function of the rotation speed controller
The temperature switch is set at the required position
The refrigerant pipes are properly supported
Check and fasten the circuit connections
Check the suction pressure
Refrigeration system
Check the discharge pressure
Check the refrigerant pipes
Check the moisture condition in the system through the sight glass
Heating system
Check the re-heater operation
Check the erosion situation of the components
Check and fasten the circuit connection
Electric control part
Check the fuse and the MCB
Check and fasten the circuit connections
Check the control program
Check the contactor action
4.3 Self-Diagnosing Functions
The micro controller has a built-in diagnostic function that helps to turn on/off the components and check their
functionality.
4.4 Maintenance of Electrical Control utilities
In this section, the following processes will be discussed in brief, namely-
1. Maintenance of Electric parts
2. Maintenance of Control System
3. Water Leak Detector
Maintenance of Electric Parts
Visual checks and handling need to be carried out to check the correctness of electrical connections for the following
items:
1. Conduct the electrical insulation test on the system to find out bad electrical connections and contacts.
Disconnect all the fuses and MCBs of the control part during the test as high voltage from the insulation test
could damage the components.
2. Check the contactors prior to powering on the unit to ensure that the contactors can hold and un-hold freely.