5. 1-1-Why Maintenance HVAC ? Increases equipment life & reliability Reduces size & scale & number of repairs Lowers maintenance costs through better use of labor &materials Reduces emergency repairs & overtime Improved parts control Reduces energy costs by 5% to 20% Eliminate the potential problems

6. 1. Periodically A- Weekly B- Monthly C- Annually A- Weekly The AHU Evap. Cond. Should be inspected periodically for air leaks, rusting condensate drainage problems, and dirt accumulation B- Monthly Monthly, inspect insulation on refrigerant lines leading into house. Replace if missing or damaged. C- Annually Air –handlers coils need to be cleaned periodically to keep heat transfer at maximum amount.Boilers need to be cleaned annually, level and condition of oil of centrifugal compressors need to be checked,cooling towers need to be cleaned 2. Preventive The preventive maintenance process can include anything from a simple visual inspection annually to proactive replacement of components based on run time, regardless of whether they have failed. Most programs for retail stores fall somewhere within this range Predictive maintenance is important. By tracking different system indicators Such as oil temperature RPM speeds. And other factors 3. Emergency At some point an HVAC system will experience a major component failure that results in a repair that the technician cannot justify based on the repair cost and the age or condition of the unit. At this point the equipment must be replaced with whatever equipment is obtainable quickly.

7. A HVAC system consists of several parts that function together to heat and cool your home or apartment building. The main components of an HVAC system include  A- filters  B- evaporator  C- condenser coils  D- air intake  E- dampers ( device used to vary the volume of air passing through an outlet, inlet, or duct; or generally through a confined cross section by varying the cross-sectional ar ea)  F- supply ducts An HVAC unit also contains fans, bearings, and belts that must be regularly cleaned to keep your unit running smoothly. Dirt, debris or other matter found in any of those components can result in the reduced functioning of your HVAC unit.

8. A- Filter Replacing filters is perhaps the easiest part of HVAC maintenance, filters should be replaced every service time during charging, evacuation or even replacing any component in the system. B-Coils Coils have a tendency to grow mold, due to being damp and wet. They are also in contact with humid, moist air, a breeding ground for mold and bacteria. Coils can also easily degrade if left dirty for extended periods of time. Left untreated for too long, coils will grow a sticky film on them that is extremely difficult to clean. The cleaning chemicals needed to treat this mold have a tendency to damage and pit the coils, requiring them to be replaced. C- Dampers Dampers keep the HVAC unit operating efficiently by keeping compressors running when the temperature dips below 60 degrees Fahrenheit. If they are not kept properly cleaned and lubricated, they will begin to stick, creating a loss of cooling and heating efficiency in your HVAC unit. Proper HVAC maintenance should include keeping the dampers well serviced, as this is the most common problem seen in HVAC systems. D- Fans and Belts Fans and belts are of the least concern during HVAC maintenance, but should still be maintained and replaced at least twice per year. Poorly operating fans or belts result in less cooling and heating efficiency, excessive noise coming from the unit, or constant vibration while running. Well-kept fans and belts mean a smoother running HVAC unit that requires less maintenance and will function longer without repairs.

9. 1- Thermostat Check the Thermostat settings to make sure the system will keep a home or building cool or warm, depending on the season. Set the thermostat to an energy-saving temperature when the house is empty to keep utility costs lower. A good starting points is 78°F ( 25.5° C ) in the summer and 68° F ( 20°C ) in the winter. 2- Condensate drain Inspect condenser drain to make sure there are no blocks or leaks, which could cause water damage in a home or affect the air humidity levels. Overall check on the system controls to be sure everything is properly operating, starting up, and shutting off. 4- Cooling Unit Clean the evaporator and condenser coils when performing maintenance on a system. Dirty or damaged coils reduce the ability of an HVAC system to cool a home, and can cause the machine to work harder. This results in more money spent on energy costs and repairs. 5- Heating Unit Check all the connections for gas or oil, depending on what a unit runs on. Check the gas pressure on a regular basis to be sure it is not too high or too low, and observe the burner combustion and heat exchanger. Problems or issues with any of these components cannot only result in less efficiency, but can be a fire hazard. For safety purposes all heating components should be checked on a regular basis or any time there is a suspected problem 6- Other Important Lubricate all the moving parts of an HVAC system, such as bearings, fans and belts. Be sure all these components are properly installed to prevent dirt from getting lodged between them and to prevent friction from creating wear and tear. Change or clean the air filters on a monthly basis to prevent a decrease in the air quality and an increase in overall energy costs 7- Insulation