Routine maintenance on a Central Control Room hermetically sealed air conditioning unit should include ()
A、changing the air filter
B、recharging the system
C、changing compressor lubricant
D、renewing container vacuum
A、changing the air filter
B、recharging the system
C、changing compressor lubricant
D、renewing container vacuum
A、keeping the terminals clean B、coating cable connections with petroleum jelly C、maintaining a trickle charge D、All of the above