York YK-EP B Operation & Maintenance Manual page 213

FORM 160.87-OM1
ISSUE DATE: 8/24/2018
• Style B Solid State Starter Applications –
Used when the microboard is interfaced to
the LCSSS Logic/Trigger Board 031-02505
(J14).
Motor Node ID (VSD and Style B Liquid Cooled Sol-
id State Starter applications).
Only displayed when Modbus is selected for the Mo-
tor Communications Protocol setpoint. Allows the
Service technician to enter the Modbus Address of the
VSD logic board or Style B LCSSS Logic/ Trigger
Board. The Motor Node ID setpoint must match the
Modbus Address assigned to these boards. Whenever
the microboard is reading or writing to these devices,
it transmits the address entered as the Motor Node ID
setpoint. The device will only respond if the transmit-
ted address matches the address assigned to the device.
The chiller must be stopped to change this setpoint.
• VSD Applications – Enter 1 for the Motor Node
ID setpoint. Then set the Modbus Address of VSD
Logic Board 031-02506 to "1" by setting Switch
SW3 position 1 to ON with all other positions
OFF.
• Style B Solid State Starter Applications – Enter
1 for the Motor Node ID setpoint. Then set the
Mod-bus Address of the Logic/Trigger Board
031-02505 to 1 by setting Switch SW1 Position 1
to ON with all other positions OFF.
Coastdown Time – Only appears when STANDARD
is selected for the Coastdown setpoint. Sets the dura-
tion of the coastdown period. The time is programma-
ble over the range of 240 (default) to 900 seconds or
150 (default) to 900 seconds as determined by the se-
lection made for the Chiller Style/ Compressor setpoint
on the OPERATIONS Screen. Refer to the Chiller
Style/Compressor setpoint.
Condenser Temperature Range – Special order chill-
ers that operate at higher than standard condenser
temperatures require higher condenser high pressure
warning and safety thresholds. This setpoint allows the
software to be used in either standard or high tempera-
ture applications. This setpoint is set at the factory at
time of manufacture and requires an ADMIN password
to change it. It is only visible when set to Extended.
The selections are:
JOHNSON CONTROLS
1. Standard – Uses standard high pressure warning
and safety shutdown thresholds as follows:
• Warning – High Pressure Limit – Maximum
allowable value is 162.5 PSIG
• Condenser – High Pressure – Trip/reset
threshold is 180/120 PSIG
• Condenser – High Pressure – Stopped – Trip/
reset threshold 160 PSIG.
2. Extended – Uses higher high pressure warning
and safety shutdown thresholds as follows:
• Warning – High Pressure Limit – Maximum
allowable value is 193.0 PSIG
• Condenser – High Pressure – Trip/reset
threshold is 200/140 PSIG
• Condenser – High Pressure – Stopped – Trip/
reset threshold is 170 PSIG
PRV Position New production chillers can be equipped
with an optional Pre-rotation Vanes potentiometer,
regardless of other options. This setpoint allows the
software to be used in all YK-EP chillers, whether
equipped with the potentiometer or not. The PRV po-
sition will be shown on respective screens when En-
abled; not shown when Disabled.
1. Enabled – Automatically set to this setting if Hot
gas bypass or Variable Geometry Diffuser (VGD)
is enabled on the OPERATIONS Screen or Mo-
tor Drive Type setpoint is set to VSD or MVVSD.
The actual connection point of the potentiometer
is determined by the equipment configuration:
• If equipped with a VSD in YORK Protocol
configuration, it is connected to the ACC
Board.
• In Modbus Protocol configuration, it is con-
nected to the microboard J7.
If not equipped with a VSD, but equipped with
Hot gas bypass, the connection point is deter-
mined by which I/O Board is present. With I/O
Board 371-02514-000 or 031-02895-000, it is
connected to this board; otherwise, it is connected
to the microboard J7. If not equipped with Hot gas
bypass but equipped with a VGD, it is connected
to the microboard J7.
SECTION 5 - SERVICE
5
213