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• You may not need an auxiliary pump if the main pool pump has sufficient pressure to overcome the
elevation and the resistance of the water piping to the dehumidifier. If the main pump will be cycled
on and off, you must use an auxiliary pump.
• If you use an auxiliary pump and you intend to cycle the main pump, you must size the auxiliary
pump to overcome the resistance of the main pool piping and filters.
• The dehumidifier is equipped with a built-in flow switch. If there is no water flow to the unit, the
refrigeration circuit will be locked out of the pool water heating mode. All other modes, such as
dehumidification and cooling, will function normally. Desert Aire recommends continuous water flow
to the unit to prevent vapor lock, pump cavitations, and nuisance head pressure trips.
• You must install an air eliminator at any high points in the pool water piping. Excess air in the Desert
Aire pool water condenser will cause inadequate pool heating and high operating temperatures and
may shorten the life of the dehumidifier.
Dehumidifiers equipped with the pool water heating option come with a factory-supplied water
temperature sensor and an aqua stat well. See Section 2.8 for details on control and sensor location.
Water Circuit Size
9/10 Ton
15 Ton
20 Ton
25 Ton
30 Ton
Water Flow Rate and
Pressure Drop: Pool
20 GPM @ 25 ft W.C.
30 GPM @ 25 ft W.C.
40 GPM @ 25 ft W.C.
50 GPM @ 25 ft W.C.
60 GPM @ 25 ft W.C.
Water Flow Rate and
Pressure Drop: Spa
27 GPM @ 35 ft W.C.
40 GPM @ 35 ft W.C.
53 GPM @ 35 ft W.C.
67 GPM @ 35 ft W.C.
80 GPM @ 35 ft W.C.
Figure 15 - Standard Unit Water Flow Rates (for Units Equipped with this Option)
2.5 Auxiliary Heat Coil Piping
The Desert Aire dehumidifier may be equipped with an optional hot water or steam air heating coil. This
coil, when properly sized, will provide space heating during the winter months.
• You must use proper practice when you design and install the coil piping to prevent poor coil
performance, shortened service life, or damage to the coil.
• The supply connections must not be supported by the coil headers.
• The control valve should be sized according to the pressure and flow rate requirements, not the
coil connection size.
• On steam systems, size the trap for at least 2-1/2 times the design condensing rate to allow for
high condensate flow on system start-up.
• On steam systems, use strainers, dirt pockets, and isolation valves to prevent clogging the
control valve and to simplify service.
• Install swing joints in the connection piping to prevent damage to the coil header for thermal
expansion.
• Use a backup wrench on the pipe stubs when attaching connections to prevent damage to the
header.
Desert Aire - SA Manual
Summary of Contents for SA Series
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