York YK-EP Operation And Maintenance Manual Download

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Microboard service replacement

About this task:

If the microboard is replaced within the warranty period, the defective board must be returned to

JCI YORK per the warranty return procedure. Use the return instructions and return address label

provided with the replacement board.

To order a replacement Microboard for a YK-EP Chiller, order part number 331-03630-615. This

part number provides an 031-03630-007 Microboard and an SD program card with the latest YK-EP

program. This SD (031-03605-002) card must be loaded in to the microboard.

1. Record the setpoints and configuration settings and print the Setpoints and Sales Order

reports.

2. Retrieve the sales order data using the YMSO utility program.
3. Shut down the chiller and then power off the unit following all JCI Safety Requirements.
4. Remove all of the wiring harness plugs from the old microboard and label any loose

communication wires that are currently connected to J2, J13 or J12.

5. Loosen the ground screw that holds the power supply harness green ground wire and

remove the power supply harness.

6. Remove the 10 microboard mounting screws and remove the old microboard.
7. Set the Jumpers JP2 through JP12 and JP21 through JP25 and SW1 switch on the 03630 to the

same positions as those on the 02430 board. A description of these jumpers are found later in

this document.

8. Install the new 03630 microboard using the screws previously removed.
9. Connect the power supply harness P2 to J2 on the power supply with the green and yellow

ground wire oriented closest to the front of the panel. Attach the ground lug under the

ground screw. (If replacing a 02430).

10. Connect power supply harness P30 to J30 on the panel wiring harness, J32 to P32 on the panel

wiring harness, P1 to J2 on the 03630 and P3 to J3 on the 03630.

11. The VSOP J20 3 pin plug has been replaced by a removable screw terminal plug. The wires

will need to be cut from the 02430 P20 plug. Strip the 3 wires 1/8” and insert them in the new

03630 J20 plug. Note that pin 1 on the 03630 board is opposite of where it was on the 02430

board. It is now on the left side of J20. Connect the White wire to terminal 1 of J20, the Red to

terminal 2 and the Black to terminal 3.

12. If an ACC board is installed, the wires on the 02430 P15 plug will also need to be cut and

stripped and inserted into the 03630 J15 COM5A removable screw terminal plug. Connect the

Red wire to terminal 1, the White wire to terminal 2 and the Black wire to terminal 3.

13. If an ACC is not installed then if the starter is a VSD, MVVSD or MVSSS with Modbus

communication, connect the Green wire to J13-2 (-), the White wire to J13-3 (+) and the Black

wire to J13-4 (Gnd).

14. If an E-Link is installed, connect the wires to 03630 J2. Connect the Red to terminal 6 GRX,

Black to terminal 6 GTX.

15. If Expansion LTC I/O or a Motor Monitoring board is installed, connect the communication

COM3 to the 03630 COM3 J12 Red wire to terminal 5 + and the Black wire to terminal 4 -.

16. Connect all of the remaining plugs to their appropriate connections on the microboard. All

plugs are marked the same designation on the 03630 as they are on the 01730 and 02430.

17. Power up the panel with the rocker switch in the OFF position.
18. Enter the Sales Order data either manually or using the YMSO utility program then enter the

setpoint and configuration data.

YK-EP Style B Centrifugal Chiller

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