York YK-EP Operation And Maintenance Manual Download

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Service

OptiView control panel

The YK-EP chiller OptiView Control Panel is very similar to the YK chiller. Therefore the below

information highlights the critical information and differences. Refer to the YK service manual for

common components not explained in this section of the YK-EP manual.

Microboard 031-03630-007

Microboard 031-03630-007 is supplied in new production YK-EP chillers starting in August of 2016.

Although this board uses a different microprocessor and supporting components, the chiller

control and operator interface are the same as the previous 031-02430-007 Microboards. It uses the

same mounting hole pattern and has the same interface connectors as the previous boards except

for the improved power supply connections and the VSOP cable uses a removable screw terminal

plug.
It is backward compatible to existing YK-EP chillers with 02430 microboards and is supplied as

service replacement 331-02430-615-615 which contains the new 03630 microboard, power supply

harness and an SD card with the program to be loaded in to the microboard. When replacing an

existing 031-03630-007 microboard, service kit 331-03630-615 provides a new board and an SD card

with the latest version program.
The new 031-03630-007 microboard consists of a base board with a small daughter board mounted

on the base board. This daughter board is the SMARC processor board. The two boards are mated

in the factory and cannot be replaced separately.
All of the connectors for the sensors, communication ports display and keypad have the same

connector designations. The jumpers related to the display and thermal flow switches remain the

same and should be set to the same positions as the existing 02430 microboard. The SW1 DIP

switch settings should be set the same as the SW1 switch positions on the 02430. Position SW1-4 on

the 03630 is now used in place of JP6 on the 02430 to initiate a program update.
On the 02430 a BRAM chip stored the configurable setpoints, sales data and Real Time Clock. The

BRAM chip has been replaced with FeRAM and a separate battery backed up Real Time Clock to

maintain the time during power outages. The RTC Battery is a CR2032 button cell Lithium battery

which can last over 10 years and is readily available at local stores.
The board is supplied with +12VDC (J1-5), -12VDC (J1-6), +5VDC (J1-1 and J1-2), +24VDC (J1-7) and

ground (J1-3 and J1-4) from the Power Supply (Refer to Figure 89). The +5VDC (fused by F1) can

be monitored at TP12 and TP3. It is used by the microboard circuits and applied to a +3.3VDC

regulator. The outputs of this regulator is applied to Microboard circuits.
The +12VDC (fused by F2) can be monitored at TP5 and TP4 in reference to TP1 GND. It is applied

to a +5VDC regulator and the output of the regulator is the +5VDC (Analog) supply that powers all

analog circuits and is the source voltage for all of the transducers and thermistors. The +5VA can be

monitored at TP10 referenced to TP1 GND.

Test points and LED indicators

The primary power supplies have LEDs to indicate the presence of power. The voltages can be

measured at the following test points in reference to TP1 or TP11.

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YK-EP Style B Centrifugal Chiller