all right today's project engineered air burner replacement let's get to this
okay so let's give you guys a quick rundown on how this operates before we
change it main gas comes in we have it teed off
right here and this is our main gas train where we
tee off is our pilot line so we have a shut off
there and we have the gas valve there that when opens
gives gas to the pilot assembly which is right here
once that pilot assembly is lit flame is proven
now we can open up the main gas valve this valve here
modulates modulates gas flow into the burner to keep the discharge
air temperature constant okay so that's why we need this modulating gas valve
and this basically steps down our gas pressure to the appliance pressure
so let's get started and get this changed out gas valve off
obviously okay there is the union which is cracked and undone
now we have to disconnect all the wiring undo some screws back in there and this
whole thing just slides right out very very easy now this
unit is still running we've isolated the heating section
from power it has to stay running because it's for a laboratory it's very
critical that it stays running so we've isolated
the heating section we're going to work on this
while the machine is still running now that we have the burner out we're just
going to clean all this area up get all that dirt out of there
the other thing is that we should be having a look at
the heat exchanger now i already looked inside here i can't see any cracks or
holes or anything like that but one thing that we need to keep in
mind is that we're starting to see some rust
okay and we're starting to see some areas where the moisture has been
collecting this heat exchanger could get replaced
very very soon the way it looks but right now
it does seem okay all right so we're getting places here the new burner is in
okay union we've got to tighten that up this plate's been all tightened so we're
all fastened in i'm going to put new connectors on these
and i also cut out the old pilot tubing that runs from inside here down to the
gas valve and i'm going to run new tubing and put on new fittings as well
so we're going to get that done right now
all right new connections are in place brand new tubing brand new fittings
with these you just want to give them a tug just make sure that
they're in there nice and tight same with the connections here just give them
a pull make sure they're in nice and tight
this tube here goes for the pilot it's the air basically for the pilot
that comes from the motor up here just to give the pilot
some air so we're gonna go ahead and put the cover back on this fire it up
there's a spot right here where we can check gas pressure we're gonna hook up
our manometer there and check the performance and the gas
pressure of this burner okay we're all back together we have the
510 ready to rock and roll the mode we're in right now is
dehumidification mode meaning the compressors run
to cool the evap coil we cool that coil down we remove moisture from the
air but if the air gets too cold going downstairs to
overcool the space we re-heat the air back up and that's
what this burner and heating section is for
in dehumidification mode so we're just waiting for this to kick in
we'll check the pressure we'll make sure it's modulating and keeping the temp
downstairs the way it should and i think we're done with this
little job here all right so we're up and running here
and i know it's really hard to see through there but
we can see the burner all fired up tried to clean this as
as best i could but i think it needs a new glass just it won't clean
we are at .24 inches okay and like i said this is a
modulating gas valve it's not full bore it modulates up
and down to feed the correct amount of gas to the burner to bring the
air up to the right temperature so we have it set for around 70 degrees it
tries to maintain 70 degrees discharge air after the
cooling coil going to the lab downstairs so that's it
guys the burner's changed it's running this is pretty good
i'm gonna go check the discharge air at the computer that's my last
step and we're done happy hvacing