V-TAC VT-6605305 Manuel D'instructions page 22

(5) Clean the inverter cooling bin and fan with soft brush or vacuum cleaner.
(6) Install the screws and covers of cooling bin or fan box to their original place.
(7) Install the inverter to its original place again according to section installation.
(8) Repeat the operations in section inspection before operation.
(9) Restart the inverter.
FAN REPLACEMENT
If high temperature occurred to the inverter or abnormal noise occurred during fan
rotating, replace the fan. Note that the fan should be replaced by professionals only.
Stop the inverter before maintenance operation, and disconnect all the power inputs

of the inverter.
Before carrying out maintenance operation, wait for at least 10 minutes until the

internal capacitors of the inverter are fully discharged,
The fan can be maintained and replaced by professional electricians only.

How to replace the fan:
(1) Disconnect AC breaker;
(2) Turn the DC switch to "OFF" position;
(3) Wait for at least 10 minutes;
(4) Disconnect all the electrical wirings at the bottom of the inverter;
(5) Lift up the inverter with the help of others and take the inverter off the wall;
(6) Place the inverter on the operation platform;
(7) Disassemble the fan box as shown in Fig 21;
(8) Disassemble the damaged inverter fan as shown in Fig 22, then install the new fan
back to its original position, and connect the fan power and control cable;
(9) Install the screws and covers of cooling bin or fan box to their original position;
(10) Install the inverter to its original position again according to section 4;
(11) Repeat the operations in section inspection before operation;
(12) Restart the inverter
Do not start the inverter immediately if it alarms and stops. Figure out the cause

Note
according and confirm all the faults are removed before starting again. Inspections
should be carried out in strict accordance with the procedures.
Figure 22 Replace the fan