Introduction to Troubleshooting:
- Use organized methods for troubleshooting.
- Review normal high side and low side conditions.
- Diagnose individual system components.
- Discuss diagnostics for 11 common air conditioning system problems.
Organized Troubleshooting Steps:
- Understand the system and compare malfunction to normal performance.
- Listen to customer feedback for valuable insights.
- Use all senses (look, touch, smell, listen) during diagnosis.
- Be logical, analytical, and seek help when needed.
- Avoid simply replacing parts; investigate the root cause.
Repair Considerations:
- Provide an estimate before repairs.
- Assess the equipment's age and repair costs.
- Offer options but let the customer make the final decision.
Air Conditioning System Performance:
- Older units (up to 10 SEER) typically have a 30-degree condenser split.
- High-efficiency units have smaller splits (15-25 degrees).
- Example splits: 12 SEER = 25 degrees, 13 SEER = 20 degrees, 14 SEER = 15 degrees.
- Subcooling averages 10 degrees but can range from 5 to 15 degrees.
Evaporator Performance:
- 35-degree split between return air temperature and refrigerant boiling temperature.
- Evaporator superheat averages around 10 degrees.
- Superheat varies with the type of metering device used.
System Example:
- 10 SEER unit with R22 refrigerant.
- 30-degree condenser split with a 95-degree ambient air temperature.
- 10 degrees of subcooling measured at the liquid line.
- 35-degree evaporator temperature difference with 10 degrees of superheat.
Impact of SEER Rating:
- Higher SEER ratings lead to lower condenser splits and condensing temperatures.
- Example: 14 SEER unit has a 15-degree split at 70-degree ambient temperature.
- Lower condensing temperatures reduce compressor workload and power consumption.
No comments:
Post a Comment