Chapter Eleven: Spa Jets - Jacuzzi Gatsby Mechanical Operation And Repair

filter, through the circulation pump, through the heater, through the ozone injector
if you have one, and back into the spa. Usually there are 2 ports where the
heated water returns to the spa.
b. Zone Two and maybe Three. The one or two larger jet pumps will draw from
the filters AND the suction fittings. It does this to move the water well. The water
flows through the jet pump and to a manifold. Typically one or two manifolds for
each jet pump. From the manifolds the water flows into smaller ¾" soft plastic
hose to one or two jets. This allows all jets in that zone to have even flow.
Spa WITH One 2 Speed jet pump and maybe a second jet Pump.
a. Pump One. Typically this is a 2 speed pump. The water flow from the one filter
AND one or two suction fittings. The water proceeds through the pump and
through the heater and normally a manifold. This manifold disburses the water
into smaller ¾" hoses and then to one or two jets.
b. Pump Two. One or two speed pump. Water flows from filter and suction fitting
through pump and into a manifold. The manifold disburses the water through ¾"
hose to jets.
The key difference between spas with circulation pump and spas without is this:
Spas with circ pump have the circulation pump running 24hrs heating and
filtering. The jet pumps are used only to turn on the jets.
Spas without circ pumps use the Zone or #1 pump to heat when on low and
when you want jet action, you turn on the pump to high. The second pump if
available is only used for jet actions.
Smaller spas have the same amount of jet action to all jets. Larger spas usually
have the spa in 2 or 3 zones. The zones are activated by the operating of the jet
pumps.

Chapter Eleven: SPA JETS:

There are several methods jets are installed. One way is ½ of the jet body is
placed on the plumbing side of the spa. Then the opposite half is screwed into
the half with either a gasket or silicon sealer from the water side. Then the jet
assembly snaps into the 2 halves.
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