Wiring Diagram Cavalier 27

[Slapshot42]

Does anyone have a wiring diagram for  a Cavalier 27?

Thanks !

[johnieG]

Here it is... I just rewired a C27 with a new modern compressor harness. & repaired the sold out switch mechnism.

[Slapshot42]

I need the diagram for the original Fridgeaire Compressor .  Been working with a few resources on a few options .  The compressor is a LOX 1212 Meter Miser like they used in a domestic fridge .

My original thought was to buy a 3-1 relay and wire C, S, R and use a newer style 4 lead compressor but it sounds like these older units don’t allow based on the relay and t stat being tied in together . Perhaps it I also change the t stat ?
 
The other option is to make my old wiring harness which I don’t relish doing .  I have a poor sketch of what I think might work... I’ll resize and attract shortly .  

The only thing mid picture is a hot wire for power strip which I could get a hot from either my fan or directly out of the relay box with an extra lead.

[Slapshot42]

Here it is... I just rewired a C27 with a new modern compressor harness. & repaired the sold out switch mechnism.

How did you tie in the on board relay did you use 3 and 1?

[johnieG]

I eliminated the original T-stat, the old start-run potential relay assy. & wired in a standard replacement vending machine wiring harness and  a 3-in-1, it simplified things quite a bit.

[Jim]

Nicely done Johnie!

[Slapshot42]

I eliminated the original T-stat, the old start-run potential relay assy. & wired in a standard replacement vending machine wiring harness and  a 3-in-1, it simplified things quite a bit.

That was my original idea but i was told since the original compressor and t stat are tied together that it wouldn’t work .  
By eliminating the old t stat I assume you replaced with a new one ?  Contact or Non - Contact?  I was told by the suppliers they don’t make the evap fan motor luckily mine works .

Did you just use ring terminals for the C, S, R?  

[johnieG]

Yes, I used a new Ranco beverage cooler/non-contact type,  also I used ring terminals on the compressor leads.  The evaporator fan is a joy to change as you have to remove the drum ‘s guts to get at it, but I have succeeded in adapting a standard unit-bearing motor in the past, fortunately,  this machine didn’t need it replaced ( plus it was an “economy” repair anyway and not a full on restoration)  getting the compressor replaced is also a chore as the whole chassis/body  must be lifted up & off in order to remove and replace it.

One more thing, use a properly sized 3-in1  (1/5Hp in this application) if you go too big, say 1/4-1/3 HP, you run a very good chance of damaging the start winding on the compressor, & then you’ll be crying.

[Slapshot42]

Yes, I used a new Ranco beverage cooler/non-contact type,  also I used ring terminals on the compressor leads.  The evaporator fan is a joy to change as you have to remove the drum ‘s guts to get at it, but I have succeeded in adapting a standard unit-bearing motor in the past, fortunately,  this machine didn’t need it replaced ( plus it was an “economy” repair anyway and not a full on restoration)  getting the compressor replaced is also a chore as the whole chassis/body  must be lifted up & off in order to remove and replace it.

One more thing, use a properly sized 3-in1  (1/5Hp in this application) if you go too big, say 1/4-1/3 HP, you run a very good chance of damaging the start winding on the compressor, & then you’ll be crying.

I removed 2 of them this week.  I live to tell the story. I bought the Supco RC810 - 1/12-1/5.  Did you use a 3 lead so you have a hot wire to feed the terminal strip ?

[johnieG]

Nope, just the two-lead model, the replacement compressor harness has an accessory connector that supplies line voltage ( not switched) it’s just not shown in my state of the art drawing...    I just tapped onto that & wired it into the upper terminal strip to supply line voltage to the vending & sold-out circuit.

Yep that’s the pileup I remember!        Jeeze, they always look so cute & innocent on the surface, ( just like kids    ).  

[Slapshot42]

Nope, just the two-lead model, the replacement compressor harness has an accessory connector that supplies line voltage ( not switched) it’s just not show in my state of the art drawing...    I just tapped onto that & wired it into the upper terminal strip to supply line voltage to the vending & sold-out circuit.

Yep that’s the pileup I remember!        Jeeze, they always look so cute & innocent on the surface, ( just like kids    ).  

Since mine is removed can I use a 3 lead like a 81 door light to power the terminal board ? I have bought both suppliers wiring harnesses . SJW ( EP15 ) one comes with (2) leads t stat and , evap fan.  Usually have to open the trap door in the back at add a 16 gauge wire with ring terminals for hot wire.  FunTronics wiring harness comes with about 3” of wire with a weird round plug.  I usually cut that off and add spade terminals for a hot wire.

Thanks for the help!!

[johnieG]

Either type of power harness will work, I just prefer the Dixie-Narco molded rubber style, btw the weird little round connector is called a “Lyall” plug ( pronounced “lie-all”) they come in two and three pin models, they are quite common on large commercial coolers, where many fan motors come pre-wired with it ( the Lyall plug) as a disconnect means to make servicing to change  them out easier where you’d have many of them say in a grocery store, etc.

And now you know more than you’d ever want to know about Lyall plugs.  

[Slapshot42]

Is the Dixie Narco style from SJW or do you have a different supplier ?  Thx

[johnieG]

I buy mine locally, but yes, it’s the same.

[Slapshot42]

After cleaning the original junction box the HP rating is 1/8 hp.  Also looking for a replacement fan blade as mine is broken.  I measured it at at 6” wide .  It resembles the fan below the pre-cool shelf of the VMC 33 . 

[johnieG]

Hmmm mine said 1/5,  but the 3-in-1 mentioned earlier in the thread has a range from 1/12 to 1/5HP so you should be good, that’s a very early version of a tri-blade fan. They are prone to cracking were the blades meet the deep-drawn hub.

[Slapshot42]

Agreed the serial tag was worn with no number .  Thought it was worth putting the actual HP rating down for reference.

Now to find a fan blade ...

[Slapshot42]

New 3 - 1 - how did you get ring terminals to fit in the threads of those terminals ?  There is small channel for the wire to go through my ring terminal shoulder / collar is to long to find inside there .  I tried bare wire with a loop and it starts up just not sure good of connection I’m getting .  I’ve seen some people tin solder the wire . 

[johnieG]

Don’t know about your compressor model, but mine had phenolic plastic binding post terminals , I just removed the phenolic caps & replaced them with 10-24 nuts & some washers.

[Slapshot42]

Mine are the same with the caps.  Regardless of how your fastening how are you getting the ring terminal to fit on those posts?  I assume your fastener is sort of bending and seating itself as it’s fastened down ?

A few fan blade options -

https://www.grainger.com/search?searchBar=true&searchQuery=aluminum+fan+blade+6%22

[cohammer]

Great job on the wiring diagram, it really helps to simplify the compressor and thermostat.

[johnieG]

If the base of the  terminals on the compressor case itself are  recessed in a surrounding phenolic “cup”  a standard ring terminals won’t conform down into the recessed area, you may have to form your own by stripping back enough of the wires to form a closed “C”  shape & tin the semi-circle portion with a soldering pistol while leaving the “tail “ flexible so it can rise up out of the recess between the threads & the top-nut.  Or you could try forked terminals

Fan-wise I’d stick with a tri-bladed if possible & use a 4-watt motor, it will run way quieter than a 9-watt so long as you keep the fan blades diameter less than 8”

[Slapshot42]

If the base of the  terminals on the compressor case itself are  recessed in a surrounding phenolic “cup”  a standard ring terminals won’t conform down into the recessed area, you may have to form your own by stripping back enough of the wires to form a closed “C”  shape & tin the semi-circle portion with a soldering pistol while leaving the “tail “ flexible so it can rise up out of the recess between the threads & the top-nut.  Or you could try forked terminals

Fan-wise I’d stick with a tri-bladed if possible & use a 4-watt motor, it will run way quieter than a 9-watt so long as you keep the fan blades diameter less than 8”

The fan motor would have to drilled , die and tapped to accommodate the bracket .

[johnieG]

if you could post a picture of what the the original motor looks like, I may have an adapter that would work, I've made a few over the years

[Slapshot42]

if you could post a picture of what the the original motor looks like, I may have an adapter that would work, I've made a few over the years

[Slapshot42]

If the base of the  terminals on the compressor case itself are  recessed in a surrounding phenolic “cup”  a standard ring terminals won’t conform down into the recessed area, you may have to form your own by stripping back enough of the wires to form a closed “C”  shape & tin the semi-circle portion with a soldering pistol while leaving the “tail “ flexible so it can rise up out of the recess between the threads & the top-nut.  Or you could try forked terminals

Fan-wise I’d stick with a tri-bladed if possible & use a 4-watt motor, it will run way quieter than a 9-watt so long as you keep the fan blades diameter less than 8”

I removed the insulating shoulder of the ring terminal.  Wire fit perfectly through the runway for the wire out to the 3 to 1.

[johnieG]

Ah you have a "belly mounted" motor ( that's what I call a motor that mounts around the middle-circumference of the motor's frame)

Easy... you just need to cut some aluminum angle to the appropriate width & using two pieces of the cut angle on each sid eof a double-footed unit bearing motor as shown in the picture, my quicky-demo is held together by sticky tape & colored with sharpies to illustrate the concept, of course you'll be using #6 or #8 hardware to mount and center it to both the motor & the inside diameter of he evap housing, & setting the correct depth for the blades to clear, you may or may not need some additional stand-offs as shown depending on the distance between the motor mount adapters & the evap' housing.

(one set for each side of course...just thought I'd mention this)

[johnieG]

So... whacha think?

[Slapshot42]

So... whacha think?

I lost you at “belly mount “ .  No just kidding , great idea .

This is the fan blade I went with . 

https://m.johnstonesupply.com/storefront/product-view.ep?pID=S58-238

[Slapshot42]

Finished getting the compressor back in .  Here are some pictures.

[Jim]

Coming together nicely!

[Zerbie]

What a great thread to read - it seems very involved and technical to a newbie like me......but so cool that this site/forum exists and kudos to the folks that keep it running! It's great to see folks sharing their experiences and knowledge helping each other out! I would venture to say that not very many folks who are not professional restorers have no idea what it takes to get all the various kinds of machines up & running again (better than they were originally designed).

[Slapshot42]

I have established line 120 power to the terminal strip .  I have about 6 bottles in the drum .  However the empty light is lit.  The only component missing is the block magnet .  If there something I’m missing ?  

[Slapshot42]

Resolved the issue the inside switch was stuck .  Working perfectly now .