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DIY Winterize Your Sprinkler System | Blow-Out Drain Wilkins Zurn 720A


well earlier today I replaced part of
the internals of the backflow preventor on this unit because i waited too long
in a frozen at first now i’m gonna drain all the water in the sprinkler system
and my units a little bit different than some I’ve seen the nice thing is I have
a valve right here on this side of the backflow diaphragm here so I can insert
air onto this side and run it through my system I’ve seen some people that have
two plugs here or a drain on the bottom if I didn’t have this I could run it
through this side or I can connect to the spigot here on the bottom but I have
this so I’m going to use this valve now the key thing you need is something to
go from your air compressor to this and this is a 1/4 inch male fitting and this
will screw into the bottom ready then the other end of your air compressor
connects into that this valve means it’s closed if it’s inline that means is open
this is open right now and this would be closed I’m gonna have this open and this
closed and again my unit is a Wilkins 720 – aid but they’re all pretty much
the same but they’re configured a little bit differently this the water comes out
of the house right here on this side and runs to the sprinkler down this pipe so
I’m going to just be adding air to this side so I don’t have to go through the
backflow preventer to add air I can just go through this side and force the air
down into the sprinkler system but before I add air to this line I’m going
to go in the garage and open up one of the zones so that one zone is open now
something important to note is you don’t want more than 40 P
sigh regulated coming out of the air compressor you can see the tanks at 150
but I turn this dial down you don’t want more than 40 running into your sprinkler
lining you could burst it I’m hoping I don’t have any burst sprinklers even
though this burst and this pipe came off I’m hoping the sprinklers are okay so
all I have to do is go open up his own add pressure to this and slowly open up
this little screw valve to let air to the first zone I’ll run that for two
minutes then I’ll go through each one of the zones and blow them all out get all
the water out of the line till I see just air coming out so that’s what I’m
going to do right now is open up what the first zone okay here we are at the
control boxes and I have Hardie integration rain dial controllers and
there’s two things you could do you could either do manual right here or you
could do setup program and for manual what you would do is you would go and
set station one you would set the time for let’s say you would set it to manual
down here you go to one you’d say two minutes and then you’d hit start and you
could go run it and you’d have to come back and manually do all that what I’m
going to do is I’m going to do set program and I’m gonna go to program C a
is the normal one it runs out I’m gonna go to C and set my own I’m gonna set
station 1 for 4 minutes right here and then all of the rest of these I’m gonna
set them for 2 minutes so that means the first one’s gonna run for 4 minutes
while I run over there and connect the hose and all the rest of these are gonna
run for 2 minutes so you can see they’re all – except for the first one is 4 and
I’ll be able to run that and it will automatically run through all of the
cycles and then I’ll do the same thing over here do that go to set program go 1
and I’m just gonna do this one for same thing over here I’ll run these
individually I’ll do the first controller box first and then I’ll come
over here and do this one so I’m gonna start the first one and run and hook up
the air compressor and should start draining the water okay now we’re ready
to do the semi-auto cycle which means run it not according
to schedule I’m gonna run this turn this to run and press semi-auto and it should
start there we go we can hook up the air okay the air compressor is set at no
more than 40 Mexican little below 40 this is all tightened in and it’s not
opens and now I’m going to slowly open this now you’ll see I took the cap off and
that was because I was hearing air coming through this backflow preventer so you don’t want any air or water
getting out of here you got to make sure that that gets a
good seal there there finally you don’t want any
air gas getting out of there so that’s how you want it sealed up and here’s the
zone I just turned on they’re spraying out water and hopefully at some point
they’ll run out it’s just like now and just let it run and let all the zones
run so they run all out of water and I have a six gallon air compressor
and it’s turning on every couple of minutes for each zone you can see some
like this or just kind of gurgling just let him run for the two minutes get all
that water out just let them run like that and you’ll notice that these sprinklers
don’t put out as much water as the larger ones so they take a little bit when these are all done just switch them
to off for the winter when all the pressure is released this will drop back
down and be where it should be normally so when you’re all done and the
pressures turned off you’ll see that this drops back down to where it should
be in the down position when the pressure was in there it was up lacking
air in that should be down and the last thing you can do is take your
screwdriver and turn all of these to a 45-degree angle so that they’re
partially open partially shot water can still get out you can open up this
plastic stopper just drain everything out and same thing with these here turn
them to a 45 and this one out of 45 just like that and I’ll take this off and
then I’ll take this valve off and put the cap back on and it’s all ready for
the winter open up this make sure yep letting all
the last little water out of the system that’s just draining any water that’s in
here and in this pipe and also the pipe coming from the house there and you can
leave this open too the goal is just to leave it open so
that nothing freezes up and out breaks in there so you just leave it partially
open so that was it it took a couple hours run through each zone
make sure there’s backflow preventor is up to seal it and the key is to get the
right fitting that cor inch male fitting to fit in the the downward side of this
if now you got to either run it through the spigot or run it through over here
hope that helps Thanks well I hope you liked the video
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