How is a heat anticipator wired
Bi-metal thermostat explanation and how to wire and set the heat anticipator
hello youtube today I want to discuss
with you on how to wire up one of these
basic bi-metal thermostat and I'm gonna
give explanation on what things are with
it how to set the heat anticipator you
know pretty much how to set these up
they're very simple there's not much to
them compared to old programmable
thermostat or digital these are still
around and still used they're you know
cheap ops and nothing fancy need
something to control your furnace or air
conditioner this this will do the job
right here on the side here where it
says Auto and on that is your fan switch
you can leave it on auto which means
when you have a call for heat or cooling
the fan kicks on automatically with the
equipment that way if you flick the
switch to on the fan will come on and
constantly circulate air constantly run
which if you have a house with a
basement you can flick it on circulate
air from the basement bring it upstairs
you know save a few dollars a month off
on your air-conditioning bill over here
where it says cool off and heat all that
is is your system selection switch if
you want the furnace to run flick at the
heat take your temperature portion up
here and instead of to where you want or
if you're repairing a furnace just kick
it all the way up to 90 to ensure you
have a call for heat for troubleshooting
and diagnostics if you want air
conditioning flick it over to cool and
make sure you turn the temperature down
in fact you hear that clicking that's
the switch inside moving in there to
make on a make and send the power for
the function to run to open these up
just kind of peel it apart like that
here roughly tells you what temperature
it is in the room and this will tell you
what it's set at
all it is back there is you have a
little by metal strip you have two
dissimilar metals that expand and
contract at different rates in fact
let's see if we can make it move here
just by blowing on it moves that little
bi-metal portion will expand and
contract at two different rates to tell
you what temperature you are in the
house here is what the thermostat looks
like under the cover okay this portion
right here that's called your heat
anticipator you have to set it for this
to run appropriately for comfort in the
home what it does is this is a heater
that will warm up do turn the butter to
make the bi-metal switch your bi-metal
ports in there expand and open this
heating circuit sooner so when the
blower continues to run it washes the
heat off the heat exchanger and you're
not overheating the house in fact it's
called a heat anticipator
it anticipates the heat on the
air-conditioner there here you have your
thermostat wire connections you have Y
which is for cooling w which is for heat
B that's for a reversing valve on a heat
pump RH and RC so this has to have that
jumper in there without that jumper
you're only going to have heating or
cooling depending how you wire it if
it's doing controlling both your furnace
and your air conditioner RH is for the
heat RC is for the cool you must have it
there I explain another video how older
natural draft furnaces the transformers
were size just to operate the gas valve
when air conditioning was Funko's added
you had to have a 40 volt amp
transformer to operate a fan relay and
the contactor so you either had to put a
new trance
former or they added a second one so
that's your whole purpose there this tab
right here is G that's where green wire
will go for fan operation o is a orange
wire that's for heat pump the reversing
valve so yellow is cool W is heat B will
be blue o will be orange G will be green
and the red wire goes to RH RC long as
you have that jumper wire there it does
not matter what wire terminal gets
hooked to does that jumper is going to
make it happen
fun one here if I can get it to where we
can see it you have this little jumper
pin you just lift it up and slides over
the pins like that it says here hg h ii
what that is is that your blower control
for your furnace if you have a modern
furnace natural graph furnace whatever
you want to call it there and it runs
off of gas you want to put that pin on h
g for heat gas that way the blower the
controls on the furnace will turn the
blower on not the thermostat if you have
electric heat
you must take that jumper pin move it
over just like that to h e which would
be where you have electric heat there is
no board no fan limit switch to try to
turn the blower on the thermostat itself
then once you get a call for heat will
do like that give it a call for heat
this will then send power from R to G to
turn the blower on and then power from R
to W to run the heat on there let's see
the heat anticipator
if you want to set it you have to do
what's called a 10 wrap you'll
essentially take I do it at the
thermostat take the W wire off of here
look like a jumper wire to it put it
around the clamp on your meter call the
10 wrap so you wrap it around the amp
clamp 10 times then put the other clamp
right back onto there run the furnace
wait for the blower to kick on wait for
everything to get going and you'll get
an amp draw if you get let's say 5 amps
you take that 5 divided by 10 to get 0.5
now if I can get it here adjusted you
see where it says 0.5 that's where this
little indicator must go for it to
operate without overheating the house
you can't just take that and turn it
because see what happens when I do that
you turn the whole thing or this whole
center dial returned you hold it in
place and just like that we have set the
heat anticipator correctly the only
reason we do the 10 Wrap is you can do
it five times or six times but you have
to admit it's a lot easier to divide by
10 then the tricep try to divide by six
or five or eight or anything like that
if you try to wrap the wire around twice
it will not give you the appropriate
magnification for the amp draw that's
why we call it we do the ten wrap just
to make sure you get a good easy number
to work with to divide by and it picks
up the signal real good that's about all
there is to it there's you know if you
had to replace one of these or wired up
I mean there's not a whole lot to it
there's no programming no setup or
anything with these bi-metal thermostat
so hopefully this video was informative
for you
take care buh-bye
