ASD

ASD spa blowers and Aerio air blower parts

Air blowers are what turn a static bath of warm water into a spa. While the circulation pump pushes water through the jets, the blower feeds a separate air channel that releases a curtain of bubbles through the floor and bench ports. The result is the soft, fizzing agitation that most bathers associate with a hot tub, and it is produced by a compact unit that draws dry air from outside the shell rather than recirculating water. Here you will find the ASD Aerio A-700 in both its standard and its heated form, listed by part number so that an existing unit can be matched without guesswork.

The Aerio A-700 range

The two items on this page are closely related and share the same base platform, which makes identification straightforward once the label on the housing or the original invoice is to hand.

• 0070000500 – Aerio A-700 single speed 700W spa air blower, the standard unit with one fixed output.
• 0070000500-HTR – Aerio A-700 heated spa blower, the same 700W blower with a 300W heater element added to the air path.

Note how the part numbers relate to one another: the heated variant carries the same root reference with an HTR suffix. When reading a faded label, that suffix is often the only visible difference, so it is worth checking whether the unit being replaced had a heater before ordering a plain blower to sit in its place.

Heated and unheated versions compared

A single speed blower delivers a constant volume of air whenever it is switched on. It is the simpler choice, has fewer electrical connections and suits installations where the air feature is used in short bursts or where the water is kept at temperature by a separate heater.

The heated version adds a 300W element that warms the air as it passes through on its way to the spa. Because incoming air is at room or ambient temperature, a long bubble session can draw heat out of the water; warming the air stream reduces that effect and makes the bubbles feel less cool against the skin. Which of the two is correct for a given spa depends on how the original system was specified and on the control panel, since a heated unit expects its element to be powered. Replacing like with like is always the safest route.

Choosing and installing the right blower

Before ordering, work through the following points:

• Output – compare the wattage stated on the old unit with the 700W rating here, as an undersized blower will not fill the air channel properly.
• Heater or no heater – look for an HTR suffix on the original part number, or for a second set of supply terminals.
• Speed – a single speed unit answers a simple on/off command; a multi-speed controller may expect more than one input.
• Outlet connection – measure the diameter of the existing air hose and the tail it slips over, and check whether the outlet points in a direction the pipework can follow.
• Mounting – note the footprint and the position of the fixing feet relative to the cabinet floor or bracket.

Air blowers must always be fitted above the maximum water line, or plumbed with a rising loop and a non-return valve, so that water cannot travel back down the air line into the motor. Water inside the housing is the single most common cause of failure on units of this type.

What tends to wear out

Blowers lead a hard life in a damp cabinet. Bearings become noisy and the pitch of the unit rises as they dry out. The air intake can clog with dust, leaves or insects, which reduces flow and makes the motor run hot. Rubber mounting feet harden and crack, passing vibration into the shell. Corroded terminals and perished supply cable are worth inspecting whenever a panel is off. If bubbles have become weak, check the air channel and the jet ports for scale before condemning the blower, as blockages downstream mimic a failing motor.

ASD at PoolParthub.com

Here we list the Aerio A-700 in standard and heated form, kept together on one page precisely because the two are so easily confused. Both are referenced by their original part numbers so an existing unit can be matched from the label rather than from a description.

Spa air systems are usually built around one blower and little else, which means a failure stops the feature completely. Stocking the exact replacement, with the correct wattage and the correct heater configuration, keeps that repair to a single component swap rather than a rebuild of the air circuit.