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Annual maintenance of your air conditioning system is essential to both your comfort and to managing your energy costs. Although your system primarily controls the air temperature of your house, it is also responsible for maintaining the air quality and reducing the humidity in your home. If the system runs constantly and barely keeps you comfortable, there's a problem that can probably be uncovered by our comprehensive 47 point tuneup. Here is a brief description of the problems that can occur when your A/C inside unit and outside unit is not properly maintained.

Air Handling Unit checks (inside unit)

Air Filter
Dirty air filters are a frequent cause of low suction pressures in air conditioning systems and high temperature rise in heating systems. Dirt will also collect on evaporator (see dirty evaporator coil). Improper filtration of the home can cause excessive dust in the house and compound allergy problems.

Evaporator Coil
A dirty evaporator coil restricts the air flow and prevents the proper transfer of heat to the refrigerant and can cause compressor failure. Compressors are not designed to pump liquid refrigerant and this can cause the compressor to fail.

Evaporator/Drain Pan
Algae can cause blockage in the drain line resulting overflow of up to 15 gallons per day. Extensive ceiling and floor damage can occur.

Blower Motor Heating
Symptoms are similar to a dirty evaporator coil (see evaporator coil). Can cause sudden loss of heating under peak load conditions or excessive heat due to low air flow which can damage heating coils.

Evaporator Coil Heating (see evaporator coil)
Can damage the high limit safety switch, heat exchanger or heating elements and shorten the life of the furnace.

Temperature Rise
When a maximum temperature rise is reached with a minimum amount of air flowing it can possibly cause damage to the heater. When a minimum temperature rise is reached with a maximum of air flowing it can lead to cold drafts being experienced.

Wiring/Disconnects
Caused by loose connections/overheating. This can cause a sudden loss of heating under peak load conditions.

Heat Sequence & Control
Can cause sudden loss of heating under peak load conditions, damage heating units or shut down entire system.

Thermostat
Causes uncomfortable temperature swings in living areas and can damage compressor.

Heat Anticipator
Causes uncomfortable temperature swings in living areas and can damage the thermostat. It greatly affects the heating efficiency of the furnace.

Air Flow
Can be caused by poor design, installation or damaged ducts which increase utility costs, cause rooms or areas of the home to feel uncomfortable, and shorten the life span of HVAC equipment.

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Condensing Unit Checks (Outside Unit)

Condenser Coil
The lack of cooling air doesn't remove heat from refrigerant properly. Since refrigerant also cools the compressor,
it can cause the compressor to overheat and fail.

Refrigerant Lines
Often the system capacity is reduced, and oil return problems are frequently experienced with undersized lines.
This can shorten the life of the compressor and increase cooling/heating bills.

Compressor
(See condenser coil). Indicates compressor overworked and bearings seizing up. Also can damage capacitor
(see Compressor Run Cap.) or overcharged unit (see Refrigerant)

Compressor run capacitor
Caused by overworking compressor (see compressor). Weak or faulty capacitor will reduce starting ability and
cause compressor not to run smoothly, which will cause compressor to overheat and fail. (A higher than normal
amperage usually indicates a weak capacitor).

Start capacitor
Weak or faulty capacitor will reduce starting torque for compressor. Compressor will overheat and fail.
(Be sure to check the potential relay before the unit is placed back in service or the new capacitor may be damaged.)

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Specific 47 point checks

Condenser (Outside Unit)

1. Compressor run capacitors
2. Condenser fan run capatior
3. Compressor start capacitor
4. Compressor potential relay
5. Compressor time delay
6. Condenser high voltage contactor
7. Compressor amperage draw
8. Condenser fan motor amperage draw
9. High voltage disconnect box and verify voltage
10. Freon temperature/pressures
11. High and low voltage connections
12. Condensate drain line and vacuum
13. Condenser fan motor blade balance
14. Outdoor condenser coil
15. Subcool of refrigerant to factory specs
16. System super heat
17. System check to current code
18. Overall equipment condition
19. Electrical connections tight
20. Phasing of compressor/fan motors
21. Clean outdoor unit

Air Handler Unit (Indoor unit)

1. Door seals
2. Duct seals at unit
3. High voltage connection box
4. Evaporator motor amperage
5. Evaporator motor run capacitor
6. Thermal expansion valve/metering device
7. Evaporator coil temperature
8. Leaving air temperature
9. Disinfect interior cabinet insulation and coil
10. Primary drain pan flow
11. Add algae tablets to drain pan
12. Safety overflow water switch
13. Electric heater, verify voltage and amperage
14. Electric heater safety controls, contactor and overloads
15. Blower wheel balance
16. Cooling coil for restrictions
17. Blower motor for restrictions
18. Thermostat operation
19. Thermostat calibration
20. Humidistat operation
21. Return ari filter and advise
22. Return box or closet for proper seal
23. Indoor relative humidity
24. Fuse/breaker size
25. Attic duct work
26. Verify labeling of main panel breakers

Unit -specific checks

• Reversing valve (heat pump)

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