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Today we're going to talk about removing and replacing the water relay
on a typical Forest unit. The doctor's complaint is going to be that
they handpiece is dripping water continuously,
whether it's in the holder out of the holder. The first thing
I would ask you to do
is to remove the handpiece from the holder and then
remove the handpiece itself and any coupler,
off of the handpiece tubing assembly. Verify that it is indeed leaking from the terminal,
the water, is leaking
from the terminal, and that tells us that it absolutely is
our water relay that's causing the problem. If we left the coupler and the handpiece
on it, trying to troubleshoot it,
there's a possibility that the issue could be caused by an o-ring on the
coupler,
or some other defect
within the handpiece or coupler so we always remove the coupler,
the handpiece, and troubleshoot with our terminals
exposed so we can see that the water is dripping, and handpiece
right here, disconnected from the couper handpiece.
So we've confirmed it we've got a bad
bad unit water relay.
So let's turn the unit off, flip the on/off switch to the off position.
We'll use our syringe to bleed off the air water pressures,
open our unit up
and the component we're replacing is this one right here.
This is the water relay. Now this is sometimes referred to as a Clippard
valve
which is appropriate since that's
who makes it.
Our ins and outs on it; we've got a water in
on this end of it here, and a water out to our handpiece tubing located at this point and
then on this end of it
is our pilot air coming in. It's actually water coolant air signal from our
foot control.
This is the signal air that actually pushes the valve open,
so the water can pass from the inlet to the outlet.
So our faulty one that we have in our unit here, is
an o-ring on this end of it. They should be seated and closed with no air
pressure applied to the relay.
However it seated but not closed, there's a defect in your o-ring,
water is leaking past it. Let's go ahead and remove the
the faulty one, this happened to be handpiece 1-2-3
So handpiece number three is the faulty one. I look in here
and it's 1-2-3, so it's going to be the one over here on the a
right side. Let's get the others out of the way.
As I described,
here's our water coming in on a blue tube. This is my handpiece tubing right here,
my water going out to the terminal and then this clear tube
on the end down here is my water coolant signal.
Now to expedite this to replace it I'm simply going to cut my tubes
I got my water in,
my water out and my
water coolant air signal too going in down here at the bottom.
Now at this point if you like, off of this
faulty relay you can remove the unit clamps
and reuse them. I'm just going to use some new ones that I've got here,
make my life easier.
So let's go ahead and find my water coolant air signal tube first,
slide one of
my tubing clamps some people
call it a ferrule, so your choice.
Can be a little bit finicky, and once I've got the ferrule down on there,
I can slide my tube up over my barb.
And the advantage a cutting the tubing off is this your not
trying to reuse a bit of the tubing on the end,
that's already been stretched by the barb, so we're using a
a fresh section the tubing on to our barb; it's going to going to be a
better
connection. More secure. So now I can slide my ferrule up,
push it onto the barb
that secures my barb and to be connection, so next
I'll get my up my water tube.
On this one,
there's a bit of flashing around the sides of each
side of the tube there, so I need to trim that back so that my ferrule slides on there.
And I actually find that these little garden shears work
pretty a pretty well for for this sort of thing.
There, now I've got
room to slide my ferrule down on there a bit. This is going to go on
the outlet, which is the side barb. Push that on,
pull our ferrule down, pushing it over the tubing
and barb connection to secure it. And all I'm left with now is my water-in,
which is my blue tube, slide my ferrule down over that,
make my tubing to barb connection,
shoving that all on there's far as I can
and let's slide my ferrule over
and secure that barb to tubing connection
once again. Having done that, the only thing I have left to do is put my
water valve back somewhat
where it was, making sure I don't kink any tube.
Go ahead close lid,
turn my unit back on again and now
I can step on the full control test my unit make sure that my handpiece is no
longer dripping water.
And I fixed the problem. It's a very simple fix,
not difficult at all. The water relay is available from Forest,
customer service, just give us call if you need one.
Thank you.