![background image](http://html1.mh-extra.com/html/york/optiview-yk/optiview-yk_service-instructions-manual_3510350354.webp)
354
FORM 160.54-M1
ISSUE DATE: 10/25/2019
SECTION 36 - SOFTWARE ENHANCEMENTS
JCI COMPANY CONFIDENTIAL
JOHNSON CONTROLS
GENERAL
Beginning March 2008, enhanced software will be
supplied in new production YK chillers and replace-
ment microboard kit (P/N 331-02430-601). This soft-
ware is backward compatible to all previous YK chill-
ers equipped with microboard (P/N 031-02430-000
or 031-02430-001). The enhancements are listed be-
low. The version and program card part number for both
NEMA 1-4 and CE chillers is C.OPT.01.18.307 (P/N
031-02474-001).
LIQUID COOLED SOLID STATE STARTER –
MOTOR COMMUNICATIONS PROTOCOL
SETPOINT
This software supports both YORK and Modbus pro-
tocol versions of the serial communications between
the microboard and the solid state starter logic/trigger
board. Although this software version supports both pro-
tocols, the logic/trigger board will not be converted to
Modbus capability until later in mid 2008.
In new production chillers before mid 2008, Microboard
COM 5 port (J15) communicates with the LCSSS log-
ic/trigger board (P/N 031-02001 or 031-02505) (TB2)
using YORK protocol. In new production chillers be-
ginning mid 2008, the microboard RS-485 COM 2 port
(J13) will communicate with the Logic/Trigger Board
(P/N 031-02505) (J14) using Modbus protocol.
The protocol and motor drive type selection is made
on the SETUP screen, using SERVICE access level.
When SSS-MOD B is selected as the motor drive type
setpoint, the motor communications protocol setpoint
is used to select either YORK or Modbus protocol, as
appropriate. The appropriate selection depends on the
actual hardware/interface that is present. As a guide,
the starter logic/trigger board is not scheduled to be
converted to Modbus capability in new production
chillers until mid 2008. A service information letter
will be issued at that time defining the hardware/inter-
face/setup requirements for Modbus protocol.
OIL PRESSURE SAFETY – R22 APPLICATIONS
When the refrigerant selection (Microboard SW1-1) is
set to R-22 and the oil pump package (SETUP Screen) is
set to VARIABLE SPEED, the OIL-VARIABLE SPEED
PUMP-SETPOINT NOT ACHIEVED safety shutdown
is not performed.
MEDIUM VOLTAGE VSD
Supported applications include 11KV, 12.47KV and
13.8KV.
Oil-Low Temperature Differential
Cycling Shutdown
When the chiller has been shutdown for less than 30
minutes, a restart should be allowed when the oil tem-
perature minus the condenser saturation temperature is
greater than 30°F. In the previous software version, this
threshold was erroneously set to 40°F.
Leaving Chilled Liquid-Low Temperature
Shutdown Offset
The low temperature shutdown threshold is programmed
as an offset below the LCLT setpoint using the shutdown
setpoint. In previous software versions, this value was dis-
played as OFFSET on the upper right area of the EVAPO-
RATOR screen. It did not always accurately reflect the
actual offset being used by the software.
In this version, OFFSET will be replaced with EFFEC-
TIVE OFFSET, and will automatically change to reflect
the actual offset being used. Usually, the offset used is the
same as the value programmed for the shutdown setpoint.
However, the offset being used will automatically change,
based on the values programmed for the LCTC setpoint
and the shutdown setpoint, to prevent the leaving chilled
liquid temperature from going below the minimum al-
lowed value:
• 36°F (water)
• 34°F (water with smart freeze enabled)
• 6°F (brine).
For example, if it is set to 45°F (water) and the shutdown
setpoint is set to 4°F, the effective offset is displayed as 4°F.
If the Leaving setpoint is lowered to 38°F, the effective
offset will change to 2°F. If the leaving chilled setpoint is
raised back to 45°F, the effective offset will revert back to
the shutdown setpoint.
ANALOG REMOTE SETPOINTS FILTERING
This software version provides filtering on the Analog
Leaving Chilled Liquid Temperature setpoint and the
Current Limit setpoint inputs. This stabilizes these re-
mote setpoint values under noisy conditions and when
the inputs are unstable.
SI0186 - SOFTWARE ENHANCEMENTS EFFECTIVE OCTOBER 2006