York YK-EP Operation And Maintenance Manual page 256

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 The VSOP J20 3 pin plug has been replaced by a removable screw terminal plug.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.
256 YK-EP Style B Centrifugal Chiller