from the board terminal to the heater posts. Unscrew the two screws holding the
straps to the board terminal. Unbolt the two nuts holding the copper straps to the
heater posts. When you reattach the new heater you will tighten to snug.
You will see that your control box stands on two legs. On most electrical
installation the electrician left enough play on the incoming power to remove the
control box enough to do the following. If your incoming power is tight and there is
no extra cord, see the above for help.
Remove the 2 bolts on each side that hold the box to the legs. Do NOT remove
the nut/bolts that hold the legs to the floor of the spa.
Now the control box will be free to pull up and toward you. When you do you will
see the OH sensor attached to the heater on a clip. Pull the sensor out. You will
also see 2 wires attached to the pressure switch. Unplug.
Remove the 2 bolts on the upper strap holding the heater assembly. I usually only
loosen the lower 2 bolts to the end of their thread. This will allow you to remove
the heater assembly.
Reverse to install. Tighten nuts/screws to snug. If the alignment of the heater has
slightly change so the straps don’t align with the holes, you can slightly bend the
copper straps to adjust for the change.
On Z models with a digital topside 1998-2001
Turn off power and drain spa. Disconnect heater from plumbing.
Open the metal cover on control box. You will see the heater on the bottom of the
box. Unplug the 2 wires connected to the pressure switch. On the right topside of
the heater you will see the OH sensor. Follow that line up to where it connects to
the board on the upper right corner. The plug is a clip with a release. Unfortuately,
the release clip is on the top of the plug so sometimes you can reach and press
down to release. Other times you take a small screwdriver to reach and press
down. The plug will simply pull out. If a little confused, look at the new assembly
and you will see the clip mentioned.
Summary of Contents for Z Builder Series
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