Chapter 6 Maintenance 47
DataMate 3000 Series Air Conditioner User Manual
Chapter 6 Maintenance
Switch off the circuit breaker to disconnect the system power supply before
maintenance unless the power supply is necessary for a certain service item.
Even if the circuit breaker on the evaporator has been switched off, the evaporator
blower, heater, condenser blower and humidifier may still have hazardous voltage.
Therefore switch off the external circuit breaker to disconnect the power supply of
the system.
6.1 Electric Board
The electric board such as interface board, control board and temperature &
humidity sensor board should be inspected on a semi-annual basis for any loose
electrical connection and signs of circuit rusting.
There are four PCBs in the controller. They detect the system fault, input signals
and output commands.
Inspect the electric boards one by one according to the procedures below:
1. Do the system insulation test, check and repair the failed contacts.
2. Check if the contacts are flexible without blocking in statistic status.
3. Clean the electric components with a brush or compressed dry air.
4. Check if the contacts have arc or burned phenomenon when closing.
5. Tighten all electric contacts.
6. Measure the temperature of all MCCBs and contacts.
Note
Do not plug or unplug any electric board with power on. Big instant current will be
produced when an electric board is plugged/unplugged with power on, which may lead to
unrepairable damage to a circuit. All control board can only be maintained after the
controller is turned off.
