Johnson Controls HELP

[MadApprentice]

Ok another problem

I am trying to work out an old johnson control it has a circle setpoint knob. With the cover off there are 4 terminals. As you turn the knob you have cooling, deadzone and heating.

I have 2 wires, compressor and reversing valve(heating) on cooling you want output for compressor and for heating you want output for compressor and reversing valve.

when you turn the knob and engage the 3 different settings you get continuity between the different terminals, it sounds simple,but its not, how do you get power on compressor on both heat and cool but not on dead zone, and how do you get power on the reversing valve just on heat, not on deadzone or cool.

Its an old Johnson Controls Australia P/L product.

PLEASE HELP!

[Brian_UK]

Sorry budy, we need a bit more info...

How many terminals do you have and which ones are active at which setting?

In other words...

Cool - terms 1 and 2 linked
DZ - 1, 2, 3 open
Heat - 2 and 3 linked

Or something similar.

Cheers

[MadApprentice]

Ok, its an old johnson controller, it has Penn on the front cover.

There are 6 terminals, the bottom two are the commons,

Gotta have power to the compressor in cooling mode, nothing to either comp or reversing valve in dead zone and power to both in heating mode. You turn the setpoint knob to get to each mode.

I was ready to kick the crap old thermostat off its bracket

Teacher wont just show me how its wired, (i am at college) I am gonna ring one of the techs during college and have them tell me how to do it over the phone. (Unless somone here tells me how to do it) I was ready to deck the teach, i was so frustrated.

What is it with tech teachers?

[Andy]

Ok, its an old johnson controller, it has Penn on the front cover.

There are 6 terminals, the bottom two are the commons,

Gotta have power to the compressor in cooling mode, nothing to either comp or reversing valve in dead zone and power to both in heating mode. You turn the setpoint knob to get to each mode.

I was ready to kick the crap old thermostat off its bracket

Teacher wont just show me how its wired, (i am at college) I am gonna ring one of the techs during college and have them tell me how to do it over the phone. (Unless somone here tells me how to do it) I was ready to deck the teach, i was so frustrated.

What is it with tech teachers?

What about doing a search on the Johnson Controls site and downloading the info on this controller:)

probably wiser than kicking ten bells out of the instructor:D

Go forth and learn the experience will do you good some night you have been called out at 3 in the morning:)

Kind Regards Andy:)

[frank]

Hi Mad

I thought you were going back to tech college with a new "learning" attitude.

Getting the answers for free won't teach you much at all.

Get down to the library or search the manufacturers web sites for info - oh, and order up some CHILL PILLS while you're at it :D

Learning takes time, and patience (a logical way of thinking always helps as well)

Is this the one? http://cgproducts.johnsoncontrols.com//MET_PDF/2497165.PDF

[dogma]

G'day Mad Apprentice.

Which unit are you working on. Petes a **** like that. smart dude but. Is it the APAC unit?

One of them has a time delay. But u can bypass the delay by shorting the jumper pins on the circuit board.

It Took us a while to work the bloody thing out too. I'm pretty sure it will be missing a link wire. 1-4 I think.

You guys only have a week to go no?




Regards

DOGMA

Say Hi to Brendon from Orfords if he's in your class.

[fridg]

MadApprentice

howdy mate , here is a vital clue for the unit you are working on.

easy way to find the circut on the thermostat is to disconnect all cables , from it , turn it on , now check the voltages at each of the six terminals , in heating cooling , the bottom 2 are always 240v

a big clue is 1 of these terminals has 52v instead of 240
the 52v terminal is the dead zone terminal , from there you will have to put a bridge in to call for power.


good luck champ. Go the temperzone


Dogma 2 wks to go champ , we'll be at the races telling stories in no time.

[frank]

[quote=fridg]easy way to find the circut on the thermostat is to disconnect all cables , from it , turn it on , now check the voltages at each of the six terminals
[quote]

Correct me if I'm wrong, but if you disconnect all cables - where is the voltage coming from?????

[fridg]

[quote=fridg]easy way to find the circut on the thermostat is to disconnect all cables , from it , turn it on , now check the voltages at each of the six terminals
[quote]

Correct me if I'm wrong, but if you disconnect all cables - where is the voltage coming from?????

Sorry frank


the power comes straight from the mains , to a push button isolation switch , to the thermostat , the cables from the thermostat then run to the unit.

So virtually you can isolate the unit while still having power go to the stat.



By the way MAD , what group are you in A, B, C

[MadApprentice]

Hey all, sorry bout not updating my progress, i worked it out.... kind of.

I have all my pracs signed off now, just got a couple of exams to go!!! The temperzone was a prick, the apac was easy to work out. (did it in 5 minutes)

Thanks forthe help all!

Ps i noticed the 52v, did u connect the reversing valve there or the compressor?

[fridg]

By the way MAD , what group are you in A, B, C

reversing valve.

see ya next year hey

[MadApprentice]

HEy Frig

Youhave obviously finished lucky you. I have two exams left. Both are resits so i will be finished tomorrow wether i like it or not.

i will probably do one exam in the morning and one in the afternoon. Back to work friday, on the drink friday night.

[fridg]

Yea i am finished. but i am hanging around til the end of the block.

Mate look for the bloke in the heatcraft hat , thats me come say gday.

[MadApprentice]

Rightio, I am going in tomorrow to sit a last exam, i will hopefuly be signed off by 10am

[MadApprentice]

Ps are you the fello whos missus used to work in a "night club" and yo have two kids?

[fridg]

No thats not me.

But i know who you are talking about.

Study up for that exam champ , think logical

[MadApprentice]

I FINISHED MY EXAMS!!!
ps fridge are you the fello who stayed at the pup?

[frank]

I FINISHED MY EXAMS!!!

Well :confused: How did you do?

[fridg]

I FINISHED MY EXAMS!!!
ps fridge are you the fello who stayed at the pup?

Yep ,glad to get out of the box , but i would still rather be down there learning more.

What exam did you resit ?

who were you not simon are you ?

Was waiting to have a yarn to you on friday