Jacuzzi Z Builder Series Mechanics And Repair page 28

R574/6
Turn off power. Open metal cover on control box. You will see the pressure
switch on the top center of the heater (steel tube).
Manufacturer's Recommended Procedure:
Disconnect the 2 copper straps from the board and the heater posts. Take care in
removing the heater posts for the post will bend and break.
Loosen the 2 screws on each "C" bracket that hold the heater in place. Finally
loosen the 2 heater coupling on both ends of the heater.
Twist heater toward you. You can change with water in the spa if you protect the
board from getting water on it. You must work fast. First, put Teflon tape or
plumber's putty on the threads of the new switch.
Replace.
My Method: It's usually faster and safer for the board to do it my way. I remove
the board except for the wires connected directly to the board. I swing the board
out and to the left and protect the board. Now any water that comes out of the
pressure switch hole will not affect the board.
FLOW SWITCH:
The flow switch performs the same function as the pressure switch.
How It Works: The flow switch is a simple device. It is installed typically after the
#1 pump discharge. It's a reed switch and a magnet. The switch is inside the
center post of the flow switch. The magnet is on the metal armature.
What It Does: When water flows pass the armature it moves toward the center
post and closes the reed switch. This tells the board that there is enough water
flow. When water stops flowing, the armature moves back and the switch opens.
Flow switches either work or do not. The key to installing is making sure the right
direction of water flow matches the design of the flow switch. Flow switch usually