a

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