 Big T
"7th Year" Silver Supporting Member
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Loc: Simi Valley CA
Reg: 04-14-06
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07-13-12 03:40 PM - Post#2247889
I have changed my binary to a trinary switch on the A/C
Being that I know squat about wiring all this stuff together and Google is not helping me at all, maybe someone can put up a drawing (I do better with pictures....yes I know how to read as well  ) of how to wire, point to point.
If not, I can work with a clear, written step by step assembly instruction and make my own drawing. Told you I could read. Just keep the words under 6 letters. 
1 ea A/C compressor
1 ea A/C blower and thermostat unit
2 ea Spal fans
2 ea Relays..one for each fan.
1 ea Dakota Digital PAC 2000 fan controller
1 ea Fan override switch
1 ea Temp sensor
1 ea Trinary switch
I think I have all of the parts listed above.
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 acardon
"9th Year" Silver Supporting Member
Posts: 9453
Loc: DFW TEXAS
Reg: 03-25-05
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07-13-12 03:50 PM - Post#2247895
In response to Big T
What A/C evaporator system do you have? Is it a Vintage Gen IV?
Don
66 Corvair (driving)
57 2dr HT (restoring)
56 2dr HT (waiting to be restored)
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acardon
"9th Year" Silver Supporting Member
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Loc: DFW TEXAS
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07-13-12 04:09 PM - Post#2247906
In response to acardon
Blue wire from evaperator to both a blue and black wire on trinary.
Black wire of trinary to compressor clutch.
Blue wire from trinary to A/C terminal of Pac2000.
How do you plan to override the fan circuit, directly to the fans or to the relays? It will take a heavy switch and wiring to go directly to the fans from the dash. The PAC200 instructions, has a diagram for the fan relays.
Don
66 Corvair (driving)
57 2dr HT (restoring)
56 2dr HT (waiting to be restored)
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Big T
"7th Year" Silver Supporting Member
Posts: 2205
Loc: Simi Valley CA
Reg: 04-14-06
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07-13-12 04:11 PM - Post#2247908
In response to acardon
Hi Don
It is a Classic Auto Air Sure Fit.
Tom
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Big T
"7th Year" Silver Supporting Member
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Loc: Simi Valley CA
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07-13-12 06:47 PM - Post#2247940
In response to acardon
Hi Don
I was going to use a SPST to switch both fan relays directly to ground at the relay (s) itself...I think. Another thing to study.
I went through your instructions.
I want to make sure I really understand what I need to do on the control side.
The compressor wire goes to a lead on the T-switch then to the A/C thermostat, from there to the Pac A/C clutch contact. After that the PAC and the switch work in concert to control the fan(s) turn on/off signal from the PAC.
Thanks Don appreciate your help.
Tom
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acardon
"9th Year" Silver Supporting Member
Posts: 9453
Loc: DFW TEXAS
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07-13-12 08:03 PM - Post#2247974
In response to Big T
You'll need a DP/ST switch to control the 2 relay grounds, otherwise both relays will be grounded anytime either one is grounded.
The trinary switch has 4 leads. The black wires are closed all the time there is the correct pressure in the system, so the compressor will run when the thermostat is not too cold. The blues wires are open until the pressure reaches 230 some odd PSI to signal the PAC to turn the fans on.
So, thermostat wire to one pole of both trinary switches. Other black to compressor clutch, other blue to PAC.
Don
66 Corvair (driving)
57 2dr HT (restoring)
56 2dr HT (waiting to be restored)
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Big T
"7th Year" Silver Supporting Member
Posts: 2205
Loc: Simi Valley CA
Reg: 04-14-06
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07-14-12 11:28 AM - Post#2248142
In response to acardon
Oh-oh!!
you mention "both" trinary switches?????. I only have one and it screws into the evaporator (I think that is what it is called.)
Could you tell me more about "both"
thanks tom
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acardon
"9th Year" Silver Supporting Member
Posts: 9453
Loc: DFW TEXAS
Reg: 03-25-05
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07-14-12 04:47 PM - Post#2248220
In response to Big T
There are 2 switches inside the trinary switch, one closes at 30 psi and opens at 406 psi, to protect the system from under or over pressure and the other closes at 254 psi to turn the condensor fan on. The black wires control the compressor and the blue wires control the fan.
Don
66 Corvair (driving)
57 2dr HT (restoring)
56 2dr HT (waiting to be restored)
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 Rick_L
Honored Member
Posts: 24724
Loc: Katy, Tx, USA
Reg: 07-06-00
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07-14-12 06:19 PM - Post#2248233
In response to acardon
Some think of it as three switches:
1. A low pressure switch that opens at <30 psi.
2. A high pressure switch that opens at >406 psi.
3. A high pressure switch that closes at 254 psi.
Hence the name "trinary".
BTW I don't know where you got your pressures - maybe from VA - but 30 psi seems high.
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Big T
"7th Year" Silver Supporting Member
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Loc: Simi Valley CA
Reg: 04-14-06
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07-14-12 06:36 PM - Post#2248243
In response to acardon
Don and Rick
Thank you for sending me in the right direction.
It makes sense to me now.
Tom
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