Specifications

YORK INTERNATIONAL 9
FORM 160.48-O1
FLA value x 100%.
For Electro-Mechanical Starter Applications
- the % of Motor Current displayed is the high-
est of the three line currents converted to ana-
log voltage calibrated to be 9.7 VDC @ 100%
FLA.
To Display OPERATING HOURS:
Use the “OPERATING HOURS” key as described on
page 8 to produce the following message:
ACCUMULATED RUN TIME = XXXXX HRS.
Version 3.E and later EPROM versions provide OP-
ERATING HOURS and STARTS COUNTER:
OPER. HOURS = XXXXX; START COUNTER = XXXXX
SYSTEM SETPOINTS
The system setpoints may be programmed by the sys-
tem operator. The “Setpoints” keys are located on the
Control Center keypad. To program, see “Programming
System Setpoints” on page 13. The following is a de-
scription of these setpoints (with the English/Metric
jumper installed on the Micro Board):
CHILLED LIQUID TEMP - This key displays the leav-
ing chilled water temperature (LCWT) setpoint in de-
grees Fahrenheit. If not programmed, the default value
is 45°F. See “Programming System Setpoints”, page 13.
NOTE: If an Energy Management System is interfaced
to the Control Center for the purpose of remote
LCWT setpoint reset, then the operator-
programmed chilled liquid temp will be the base
or lowest setpoint available to the Energy Man-
agement System (EMS). This chilled liquid
temp value must also be entered into the EMS.
Further, any subsequent change to this value
must also be entered into the EMS.
% CURRENT LIMIT - This key displays the maximum
value of motor current permitted by its programmed
setting. The value is in terms of percent of Full Load
Amps (FLA). If not programmed, the default value is
100%. See “Programming System Setpoints”, page 13.
If chiller is equipped with a YORK Solid State Starter,
the system FLA is also displayed. This value is pro-
grammed by the factory and should never be changed.
The Micro Board uses this value to calculate and dis-
play the % Motor Current parameter that is displayed
when the “% MOTOR CURRENT” display key is pressed.
Also, proper current limit control depends on the cor-
rectly programmed FLA value. For security reasons, a
special access code is required to program the FLA value.
It should only be changed by a service technician.
A AMPS = XXXX; B AMPS = XXXX; C AMPS = XXXX
V A – B = XXXX; V B – C = XXXX; V C – A = XXXX
If chiller is not equipped with Solid State Starter, this
key produces the following message:
SOLID STATE STARTER NOT INSTALLED
In program mode, this key is used to display the appli-
cable line voltage range (200-208 VAC, 220-240 VAC,
380 VAC, 400 VAC, 415 VAC, 440-480 VAC, 500-600
VAC, Supply Voltage Range Disabled). The correct line
voltage range is programmed at the YORK factory and
is checked by the service technician at start-up. For
security reasons, a special access code is required to
program the line voltage range. The line voltage range
is used to determine a low line voltage threshold for
cycling shutdown. Refer to “System Setpoints” below
for Trip/Reset values.
To Display CONDENSER LIQUID TEMPERATURES:
(Field Installed Option Package)
Use “CONDENSER LIQUID TEMPS” display key as
described above to produce the following alphanumeric
display message:
COND LEAVING = XXX.X °F. RETURN = XXX.X °F
NOTE: If the condenser liquid thermistors are not
connected, the display will blank when this key
is pressed.
To initiate a PRINT to Printer:
Press the “PRINT” key to initiate a printout to an op-
tional printer. When the key is pressed,
PRINT ENABLE
is displayed. Refer to “MicroComputer Control Center -
System Status Printers” instruction (Form 160.48-
NO1.2) for details of the optional printers.
To Display MOTOR CURRENT:
Press the “% MOTOR CURRENT” display key as
described above to display motor current as a percent
of Full Load Amps (FLA). The message is as follows:
MOTOR CURRENT = XXX % FLA
NOTE: For Solid State Starter Applications - the
% Motor Current displayed is the highest of three
line currents divided by the programmed chiller