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3
Start-Up Procedures
Read this section thoroughly before attempting to commission the Desert Aire dehumidifier. A complete
start-up will minimize operational problems and expensive callbacks. The start-up will be quicker and
easier if there is a heat and humidity load present in the space. Energize any auxiliary air and pool water
heaters before the start-up so that the air and water are at their design temperatures. Crankcase heater
should be energized for 24 hours before refrigeration system is allowed to operate.
3.1 Preliminary Inspection
Verify that all contractors have completed their work. Find the Desert Aire “SA Start-Up Report”, which is
located near the back of this manual. You must fill out the start-up report to validate the dehumidifier
warranty. Check the following items:
• Before starting unit, remove wooden shipping blocks found beneath compressor(s).
• Before starting unit, remove shipping restraining brackets on supply blower equipped with the
spring isolation base, if applicable.
• Verify that the incoming power supply matches the rating plate of the dehumidifier. The fused
disconnect and the power supply wiring must be rated to handle the minimum ampacity rating
printed on the rating plate.
• With the power supply disconnected and locked, tighten all field and factory electrical
connections.
• Check and adjust the belt tension for proper deflection at the midpoint of the blower belt(s).
• The deflection is based on the belt length. The belt length can be found on the belt itself.
Determine the force using the Belt Deflection Force table in Figure 30.
Belt Length
25” to 50”
51” to 70”
71” to 110”
Deflection
0.25”
0.375”
0.625”
Specified Belt Deflection
Figure 29 - Specified Belt Deflection Table
Desert Aire - SA Manual
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