Maintenance & Troubleshooting
Vertiv | Liebert CRD10 | User Manual
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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.
3.
Clean the electrical and control components off dust with brush or dry compressed air.
4.
Check the closing of contactors for arcs or signs of burning. Replace the contactors, if required.
5.
Fasten all the electrical connection terminals.
6.
Check that the sockets and plugs are in good condition. Replace the contactors, if required.
7.
If the power cables are damaged, get them replaced by a qualified/certified electrician.
7.4.2
Maintenance of Control System
Appearance checks and simple, functional tests, coupled with handling of control parts needs to be carried
out on the following items:
1.
Carry out visual checks on the power transformers and isolation transformers for any burn marks followed
by testing the output voltage (of the indoor unit and outdoor condensers).
2.
Check for signs of ageing on the control interface board, control board, temperature and humidity sensor
boards, and fuse boards.
3.
Clean the electrical control components and control board to remove dust. Debris, dust, and dirt must be
removed, preferably by a dust removing agent.
4.
Check and fasten the Input/ Output ports on the control interface board. It should also include the
connections between the control board and control interface boards as well as between the
Temperature/Humidity sensor boards and the control interface board.
5.
Check the connection between the user terminals (24#, 51#, 37#, 38#, 72#, 73#, 75# and 76#) and the
control interface board.
6.
Check the output connections between the control interface board and various components including
contactors and solenoid valves for liquid pipes. Inspect the input connection between the control interface
board and various components, including high pressure switches, heating overtemperature protection
switches, discharging temperature and high pressure sensors. Specifically, check the inserting terminals such
as high pressure switches and heating over temperature switch followed by replacing the component if it is
loosened or in poor condition.
7.
Replace the faulty electric components such as faulty control fuses (
or MCB’s) and control
boards.
8.
Check the trunking or insulation condition of the control and power cable connected to the condenser from
the indoor unit. Replace the cable, if required.
9.
Use a temperature/humidity measuring meter with high precision to calibrate Temperature/Humidity
sensor.
