York 160.87-OM1, Operation And Maintenance Manual

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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.
239 YK-EP Style B Centrifugal Chiller