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FORM 160.87-OM1
ISSUE DATE: 8/24/2018
OPTIVIEW CONTROL PANEL
The YK-EP chiller OptiView Control Panel is very
similar to the YK chiller. Therefore the below infor-
mation highlights the critical information and differ-
ences. 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 pro-
duction YK-EP chillers starting in August of 2016. Al-
though this board uses a different microprocessor and
supporting components, the chiller control and opera-
tor 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 sup-
ply 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 mi-
croboard. 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 des-
ignations. The jumpers related to the display and ther-
mal 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 bat-
tery backed up Real Time Clock to maintain the time
JOHNSON CONTROLS
SECTION 5 - SERVICE
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 83 on Page 218). The +5VDC (fused by F1)
can be monitored at TP12 and TP3. It is used by the mi-
croboard 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 cir-
cuits 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
TABLE 10 - TEST POINTS AND LED INDICATORS
VOLTAGE
+5VDC
+12VDC
-12VDC
+24VDC
+3.3VDC
VCC
+5VA
Battery
Boot-up Program
The Boot-up Program is stored in Flash memory. It
may be updated along with a new version of the oper-
ating program by inserting an SD card containing the
new program into the SD card slot on the 03630 board,
setting DIP Switch SW1 position 4 to ON and then
applying power to the chiller. The Boot-up Program
version is displayed on the DIAGNOSTICS Screen in
SERVICE access level.
TEST
VOLTAGE RANGE
POINT
TP3
+4.92 to +5.28VDC
TP4
+11.58 to +12.5VDC
TP33 -11.5 to -12.5VDC
TP35 +22.4 to +26.7VDC
TP2
+3.25 to +3.43VDC
TP15 +4.92 to +5.28VDC
TP10 +4.95 to +5.05
n/a
+2.95 to +3.45
5
FUSE
LED
F1 (5A) CR56
F2 (5A) CR57
F3 (5A) CR58
F4 (4A) CR59
n/a
CR62
n/a
n/a
n/a
CR61
n/a
n/a
201
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