8
YORK INTERNATIONAL
CONTROL CENTER
CONTROL CENTER
The Control Center front panel layout consists of five
key groups, one switch and a 1 line by 40 character
alphanumeric vacuum fluorescent display: (see Fig.
3.)
CHARACTERISTIC DISPLAY
The alphanumeric
vacuum fluorescent display is located to the right of
the
STATUS
key. All messages, parameters, set points,
and data can be viewed at this location. The main com-
munications between the operator or service techni-
cian and the MicroComputer Control Center occurs on
this display.
DISPLAY
Provide a direct readout of each monitored
parameter on the alphanumeric display.
ENTRY
These keys are used to enter the values for
the operator programmed setpoints. These keys are
used in conjunction with the
Setpoint
keys while in
PROGRAM
mode.
SETPOINTS
These keys are used as follows:
1. To view each setpoint, in any mode, or
2. To select the individual setpoints that are pro-
grammed by the operator in
PROGRAM
mode only.
Pressing the appropriate key enables the operator to
program that setpoint pressing the
Entry
keys.
SERVICE
Included in this group of keys are those
functions that are only relevant to servicing the chiller.
Typically, these keys would not be used for daily chiller
operation.
ACCESS CODE
Permits operator to access the pro-
gram.
PROGRAM
Permits operator to program the Control
Center.
MODE
Permits operator to check what mode the
Control Center is presently in (
LOCAL, REMOTE
or
SERVICE
).
1.
Service
allows manual PRV control with visual
display readout of PRV operation.
2.
Local
allows manual compressor start from the
COMPRESSOR
switch on the Control Center front.
3.
Program
allows operator programming of system
setpoints.
4.
Remote
allows remote start, remote stop of com-
pressor and remote reset of LCWT and % current
limit.
COMPRESSOR-START, RUN, STOP/RESET
SWITCH
This 3-position rocker switch is used to start
(except in
REMOTE
mode), stop/run/reset the system.
OPERATION
DISPLAYING SYSTEM PARAMETERS
The
Display
keys are used to display selected moni-
tored parameters as follows: (Refer to Fig. 3.)
Press and release the appropriate
Display
key
the message will be displayed for 2 seconds.
or
Press and hold the appropriate
Display
key the
message will be displayed and updated every 0.5
seconds until the
Display
key is released.
or
Press and release appropriate
Display
key, then
press and release the
DISPLAY HOLD
key the
message will be displayed and updated every 2 sec-
onds until the
DISPLAY HOLD
key is again pressed
and released, or 10 minutes have elapsed, which-
ever comes first.
NOTE: If the display actually displays Xs, then the
monitored parameter is out of normal operat-
ing range (refer to Fig. 4). If the English/Met-
ric jumper is installed on the Micro Board, all
temperatures are displayed in degrees Fahr-
enheit (°F) and all pressures are displayed in
pounds per sq. inch gauge (PSIG) except oil
pressure which is displayed in pounds per sq.
inch differential (PSID). If the English/Metric
jumper is not installed, all temperatures are
displayed in degrees Centigrade (°C) and all
pressures are displayed in Kilo-Pascals (kPa).
