Abstract:
Nowadays the air conditioner is one of necessary. It is used to make air to be suitable for
humans working. And it also helps the air in the room is cleaner because in the present day air
has more dust which make people to be allergy. Air conditioner is a kind of electric appliance
need maintenance to extended usability and to reduce deterioration.
There are 67 air conditioners at the faculty of Industrial Technology, Valaya Alongkorn
Rajabhat University installed at many places of building. In the past, these air conditioners had no
maintenance in advance. They were repaired when they had a trouble. Moreover, the budget for
these repairs cannot be estimated.
According to this research found that in each month the expense for repairs is not equal. It
depends on conditions of using. Summary, table 1-1 shows that there are 108 times of repairs in 1
year cost 256,900 baht. Following a comparison between 6 months before doing PM and after
doing PM found that before doing PM they have to pay 121,600 baht but after doing PM They
pay 98,800 baht. It shows that doing PM can reduce the expense about 22,800 baht or 23%. This
result agrees with the objective.