Because you have a trinary switch the ac relay setup they show in their diagram is unnecessary. Vintage air 18865 goll st.
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Trinary switch wiring diagram. When the pressure of the refrigerant in the system exceeds the set point of the trinary switch it will close its contacts and connect the fan trigger to ground. Shown below are the terminal positions typical wiring colors and usage. These are listed below. 1 pac 2750 module 1 rly 3 relay with wiring harness 1 bim data cable 1 bim xx 2 adapter harnesses 1 instruction manual for some options of the pac 2750 additional components are required. Trinary switch wiring diagram. Using a trinary switch can improve system performance extend the life of the radiator fan and in this case simplify the wiring substantially.
Trinary switch blue blue blue. Terminal 1 black wire. The system on page 62 was a trinary switch operated system which means the condenser fan and the fan clutch are only on when the head pressure is high enough to close the switch. Four seasons trinary switch part numbers are 35889 and 35901. You may still need a kenworth diagram but the manual will help you identify what kind of switches you have. W kenworth ac wiring diagram ci2t together with watch in.
Also below is the internal schematic for each of these switches. Dakota digital pac 2750 man 650411d pac 2750. If the original trinary switch terminals are different a four wire boot connector part number 35900 can be used. San antonio tx 78266 p. In the vintage air diagram you will see that the blue wire on the trinary switch is used to ground switch the coil of the cooling fan relay. Jan 13 i was looking at the wiring diagram for your radiator fans on the be cool website.
Gallery of Trinary Switch Wiring Diagram
