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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 problem, do
not be intimated 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:
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 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 contractor. 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.
• 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.
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Desert Aire - SP Manual
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