UC Davis Western Cooling Efficiency Center:

Faults in Commercial Packaged AC Systems Survey

Thank you for participating in our survey about faults in SMALL COMMERCIAL building packaged AC systems. Please think about all the times you, your workers, or your customers encounter an RTU, whether it's routine maintenance or a service call. Answer the following question for each of the faults listed. Don't worry, we don't expect you to know exact numbers, just use your judgment and gut instincts.

WHAT PERCENT OF EXISTING COMMERCIAL RTUS HAVE THE FOLLOWING FAULTS?

1. Cabinet

	<1%	1-5	5-10	10-20	20-30	30-40	40-50	>50%
Access panel ajar or completely off	*Cabinet Access panel ajar or completely off <1%	Access panel ajar or completely off 1-5	Access panel ajar or completely off 5-10	Access panel ajar or completely off 10-20	Access panel ajar or completely off 20-30	Access panel ajar or completely off 30-40	Access panel ajar or completely off 40-50	Access panel ajar or completely off >50%
Other faults (please specify below)	Other faults (please specify below) <1%	Other faults (please specify below) 1-5	Other faults (please specify below) 5-10	Other faults (please specify below) 10-20	Other faults (please specify below) 20-30	Other faults (please specify below) 30-40	Other faults (please specify below) 40-50	Other faults (please specify below) >50%

Other (please specify)

2. Compressor

	<1%	1-5	5-10	10-20	20-30	30-40	40-50	>50%
Electrical problem (like motor windings)	*Compressor Electrical problem (like motor windings) <1%	Electrical problem (like motor windings) 1-5	Electrical problem (like motor windings) 5-10	Electrical problem (like motor windings) 10-20	Electrical problem (like motor windings) 20-30	Electrical problem (like motor windings) 30-40	Electrical problem (like motor windings) 40-50	Electrical problem (like motor windings) >50%
Mechanical problem (like bearings)	Mechanical problem (like bearings) <1%	Mechanical problem (like bearings) 1-5	Mechanical problem (like bearings) 5-10	Mechanical problem (like bearings) 10-20	Mechanical problem (like bearings) 20-30	Mechanical problem (like bearings) 30-40	Mechanical problem (like bearings) 40-50	Mechanical problem (like bearings) >50%
Burn out	Burn out <1%	Burn out 1-5	Burn out 5-10	Burn out 10-20	Burn out 20-30	Burn out 30-40	Burn out 40-50	Burn out >50%
Other faults (please specify below)	Other faults (please specify below) <1%	Other faults (please specify below) 1-5	Other faults (please specify below) 5-10	Other faults (please specify below) 10-20	Other faults (please specify below) 20-30	Other faults (please specify below) 30-40	Other faults (please specify below) 40-50	Other faults (please specify below) >50%

Other (please specify)

3. Condensate

	<1%	1-5	5-10	10-20	20-30	30-40	40-50	>50%
Condensate leaks - drain line plugged	*Condensate Condensate leaks - drain line plugged <1%	Condensate leaks - drain line plugged 1-5	Condensate leaks - drain line plugged 5-10	Condensate leaks - drain line plugged 10-20	Condensate leaks - drain line plugged 20-30	Condensate leaks - drain line plugged 30-40	Condensate leaks - drain line plugged 40-50	Condensate leaks - drain line plugged >50%
Condensate leaks - evaporator coil frozen	Condensate leaks - evaporator coil frozen <1%	Condensate leaks - evaporator coil frozen 1-5	Condensate leaks - evaporator coil frozen 5-10	Condensate leaks - evaporator coil frozen 10-20	Condensate leaks - evaporator coil frozen 20-30	Condensate leaks - evaporator coil frozen 30-40	Condensate leaks - evaporator coil frozen 40-50	Condensate leaks - evaporator coil frozen >50%
Other faults (please specify below)	Other faults (please specify below) <1%	Other faults (please specify below) 1-5	Other faults (please specify below) 5-10	Other faults (please specify below) 10-20	Other faults (please specify below) 20-30	Other faults (please specify below) 30-40	Other faults (please specify below) 40-50	Other faults (please specify below) >50%

Other (please specify)

4. Condenser Coil

	<1%	1-5	5-10	10-20	20-30	30-40	40-50	>50%
Dirty coil affecting heat transfer efficiency but not airflow	*Condenser Coil Dirty coil affecting heat transfer efficiency but not airflow <1%	Dirty coil affecting heat transfer efficiency but not airflow 1-5	Dirty coil affecting heat transfer efficiency but not airflow 5-10	Dirty coil affecting heat transfer efficiency but not airflow 10-20	Dirty coil affecting heat transfer efficiency but not airflow 20-30	Dirty coil affecting heat transfer efficiency but not airflow 30-40	Dirty coil affecting heat transfer efficiency but not airflow 40-50	Dirty coil affecting heat transfer efficiency but not airflow >50%
Dirty coil affecting airflow	Dirty coil affecting airflow <1%	Dirty coil affecting airflow 1-5	Dirty coil affecting airflow 5-10	Dirty coil affecting airflow 10-20	Dirty coil affecting airflow 20-30	Dirty coil affecting airflow 30-40	Dirty coil affecting airflow 40-50	Dirty coil affecting airflow >50%
Corrosion of coil	Corrosion of coil <1%	Corrosion of coil 1-5	Corrosion of coil 5-10	Corrosion of coil 10-20	Corrosion of coil 20-30	Corrosion of coil 30-40	Corrosion of coil 40-50	Corrosion of coil >50%
Other faults (please specify below)	Other faults (please specify below) <1%	Other faults (please specify below) 1-5	Other faults (please specify below) 5-10	Other faults (please specify below) 10-20	Other faults (please specify below) 20-30	Other faults (please specify below) 30-40	Other faults (please specify below) 40-50	Other faults (please specify below) >50%

Other (please specify)

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UC Davis Western Cooling Efficiency Center: Faults in Commercial Packaged AC Systems Survey

UC Davis Western Cooling Efficiency Center:

Faults in Commercial Packaged AC Systems Survey