Troubleshooting: Semi-Annual Preventive Maintenance

Problem

Possible Cause

Corrective Action

Airflow too high

• External static pressure may

 

be too low.

•Check the evaporator coil pressure drop through the display interface. Pressure should match the recommended pressure drops indicated on the chart based on Module size. If the pressure drop is above the recommended settings, decrease the blower speed until the pressure drop matches the recommended setting. See “Calibrate airflow manually” on page 17.

Temperature control

• Cooling and reheat settings

not precise enough

are not close enough.

 

• Reheat PID loop is not

 

properly tuned.

 

• SCR controller is not

 

working.

 

• The mode of operation is

 

turned off.

 

• Non-essential lockout has

 

been activated by a user-

 

defined input with the

 

equipment.

 

• Return air temperature is

 

reading incorrectly.

•Check setpoints for cooling and heating as well as deadbands.

•Tune the PID loop for accurate reheat operation.

•Confirm the operation of the SCR controller.

•Check to verify that the proper modes of operation, cooling, and reheat are activated. A Module must have specific options installed to allow all modes of operation to be active.

•Review event log to see if this alarm input has been activated.

•Return air is not coming from the common space and may be influenced by a close heat source or a discharge air duct affecting return air temperatures. Try to eliminate the hot or cold air stream or relocate the sensor for better room temperature readings.

Humidification

• Check the setpoints for

control is not

humidification and

precise enough

dehumidification.

 

• Humidifier may not be

 

operating correctly.

 

• The mode of operation is

 

turned off.

 

• Non-essential mode input

 

has been activated by

 

customer interface with

 

equipment.

 

• The room is not properly

 

sealed internally to maintain

 

vapor pressure in the

 

controlled space.

•Verify that the setpoints are not too far apart. Typical setpoint between humidification and dehumidification is 10%.

•Verify humidification operation. Ensure that there are no humidifier alarms that could impede the humidification process.

•Ensure that the proper modes of operation, humidification and dehumidification, are activated. A Module must have specific options installed to allow all modes of operation to be active.

•Review the event log to see if this alarm input has been activated.

•The room must have an adequate vapor barrier installed to maintain humidification and dehumidification setpoints. The vapor barrier is inadequate if humidity in the controlled space changes based on influences from the surrounding air outside the controlled space.

68

NetworkAIR IR Operation, Maintenance, and Troubleshooting

Page 73 Page 75
Page 74
Image 74
American Power Conversion Central Air Conditioning System manual Troubleshooting Semi-Annual Preventive Maintenance
Page 73 Page 75

Central Air Conditioning System specifications

American Power Conversion (APC) is renowned for delivering innovative solutions in the realm of power management, but its contributions don't stop there. The company has also made significant advancements in central air conditioning systems. Featuring cutting-edge technologies and energy-efficient designs, their HVAC systems are tailored to meet modern needs while ensuring comfort and sustainability.

One of the standout features of APC central air conditioning systems is their variable speed compressor technology. This advanced system operates at different speeds rather than just cycling on and off. By adjusting the compressor speed to match the cooling demand, these systems optimize energy consumption, leading to lower electricity bills and extended equipment lifespan.

APC's systems also incorporate smart thermostat capabilities, allowing homeowners to monitor and control their air conditioning remotely. Through a mobile app, users can adjust temperature settings, create schedules, and receive maintenance alerts, all of which enhance convenience and efficiency. Furthermore, these smart thermostats can learn user habits over time, automatically adjusting temperature settings to maximize comfort and savings.

Another key characteristic of APC central air conditioning systems is their commitment to eco-friendly refrigerants. Utilizing low global warming potential (GWP) refrigerants, these systems minimize the environmental impact while maintaining high-performance standards. With energy efficiency ratings that often exceed industry benchmarks, APC systems contribute to reduced greenhouse gas emissions and help homeowners adopt sustainable practices.

The design of APC air conditioning units is also noteworthy. They are constructed with durable materials that withstand various weather conditions, ensuring reliability during the hottest months. Additionally, the streamlined design of these systems enhances aesthetic appeal, making them a suitable choice for modern homes.

In conclusion, the American Power Conversion central air conditioning system exemplifies the synergy of innovative technology, energy efficiency, and user-friendly features. With variable speed compressors, smart controls, eco-friendly refrigerants, and robust construction, APC provides homeowners with a dependable and sustainable climate control solution. As demand for energy-efficient products continues to grow, APC is poised to lead the way in intelligent air conditioning solutions that prioritize both comfort and environmental responsibility.
Top Page Image Contents