Introduction

Indonesia consists of various industrial sectors. Chemical sources will produce exhaust gases from production process, exhaust gases produced like CS2, H2S, SO2, SO3, and sulfur.
The problem of HVAC system in industry is the source of the chemicals used that will produce contaminant gases which is can cause corrosion of the equipment used, that’s why, it is necessary to protect the equipment and maintain it in order to maintain the condition of the equipment according to standards so it can protect from damage due to corrosion.
Apart from the arround environmental conditions, the factor that can affects performance of the HVAC system comes from the age of the system itself. HVAC system with a long service life can cause the system cannot work optimally and of course the efficiency achieved will decrease and increase maintenance costs.
This can get worse if the implementation of HVAC system which has a long life and not carried out routinely (Periodically maintenance), the worst result is the HVAC system does not work optimally, high cost for repair, and high cost for power consumption.
That's why, HVAC system is needed that suits the needs of the industry by customize the system to suit with extreme conditions. In addition to customize the HVAC system that will be use, it need to carry out periodic maintenance on HVAC system so its makes performance can continue to be optimal.

A. Data Collection

a. Measurement of room temperature and relative humidity (RH) before and after cleaning the HVAC unit

b. HVAC system inspection
1. Mechanical system performance
- HVAC unit specifications check on the nameplate
- Refrigerant pressure check
- HVAC unit components Check
- Visual check:
a) condition of the indoor unit housing check
b) condition of the outdoor unit housing check

2. Electrical system performance
- Condition of the cable connection check
- Electrical circuit check

3. Data collection before and after maintenance
- Measurement of supply and return temperature on the unit
- Measurement of the in and out temperature of the chiller pipe on the unit
- Airflow measurement
- Measurement of blower motor noise
- Measurement of electric current

c. Maintenance unit HVAC
- AC Split and AC Floor Standing
- Fan Coil Unit (FCU)
- Air Handling Unit (AHU)

B. Data Process

Advantages
1. Keeps your unit lasting longer
Another benefit of having regular HVAC maintenance is that it keeps your unit lasting longer, by replacing worn-out parts when necessary, you’ll extend your unit’s entire lifespan
2. Improved safety for you and equipment
Unstable temperature can cause losses, for example equipment which overheat and comfort workers which will reduce productivity
3. Energy save
It goes without saying that a well-functioning HVAC system means lower utility bills. If the air filters are cleaned and the parts are functioning as they should, your HVAC system won’t have to work harder to cool the rooms