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4.
Troubleshooting
Although Desert Aire dehumidifiers have been designed for reliable and trouble-free operation, you may
occasionally encounter a service-related problem. If you cannot immediately diagnose a fix to the
problems, do not be intimidated by the apparent complexity of the dehumidifier. Your common sense and
experience can help you solve the majority of these problems.
These problems or complaints are frequently caused by improper interlocks between the dehumidifier
and the other equipment and accessories at the jobsite. You may need to consult with other contractors
who have worked on different portions of this project. Read Section 3.4 for a more detailed list of
interlocks.
The following list will help you diagnose some of the most obvious symptoms of a system which
does not work properly.
4.1
The Blower Does Not Run
The standard Desert Aire dehumidifier is designed for continuous blower operation, which helps prevent
air stratification, occupant discomfort, and structural damage to the ceiling and upper walls of the
poolroom. Check for these problems:
•
Check for power at the power block on the electrical panel of the dehumidifier.
•
Verify that the incoming power matches the value printed on the unit rating plate.
•
Check the branch fusing. Replace any defective fuses and determine why they failed.
•
Use a voltmeter to trace the low-voltage control wiring. Determine if voltage is applied to the
holding coil of the blower contactor.
•
If there is no voltage at the holding coil, check the blower overload, the control transformer, the
smoke alarm interlock, or the optional voltage monitor relay.
•
If the dehumidifier uses a non-standard controller, or if the blower is cycled by the building
management system, consult with the controls contractor.
4.2
The Compressor(s) Do Not Run
If a compressor doesn't run even though the humidity in the poolroom is excessive, check the sequence
of operation of the dehumidifier. Under certain situations the controller will lock out the
compressors to prevent the pool room from overheating. See Section 5.5 in the Appendix for more
details. If the problem is not controller-related, check the following:
•
Check the "Compressor Fault" indicator on the controller display panel (for dehumidifiers with the
standard controller). The fault indicator will flash if one of the compressor safety devices
has tripped. The indicator will automatically stop flashing when the problem has been corrected.
See the low-voltage wiring schematic for details on this fault circuit.
•
Check for power at the power block on the electrical panel of the dehumidifier.
•
Verify that the incoming power matches the value printed on the unit rating plate.
•
Use a voltmeter to trace the low-voltage control wiring. Determine if voltage is applied to the
holding coil of the compressor contactor.
•
If there is no voltage at the holding coil, check the compressor overload and safety devices, the
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Desert Aire - SA Manual
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