Specifications

YORK INTERNATIONAL 19
FORM 160.48-O1
trol circuitry is automatically placed in “AUTO” mode and
the vanes operate to control the leaving chilled water
temperature to the programmed setpoint. (This function
applies to non-Variable Speed Drive applications only.)
CLOSE - Press and release this key to drive the
prerotation vanes closed. If the chiller is running,
SYSTEM RUN – VANES CLOSING
is displayed. If chiller is not running,
SYS READY TO START – VANES CLOSING
is displayed. When the vanes are fully closed,
SYS READY TO START – VANES CLOSED
is displayed. The vanes will continue to close until the
“OPEN”, “HOLD” or “AUTO” keys are pressed. (This func-
tion applies to non-Variable Speed Drive applications
only.)
OTHER SERVICE KEYS
WARNING RESET - Press and release this key to reset
the excess purge counting circuitry and the excess purge
display message. Also, any “WARNING” or “STATUS”
message can be reset with this key, unless the condi-
tion still exists. To reset any cycling or warning mes-
sage, place the Control Center in “SERVICE” mode and
press “WARNING RESET” key. To reset any safety shut-
down message, press “WARNING RESET” key in “SER-
VICE” mode with the “COMPRESSOR” switch in the
“STOP/RESET” position.
MANUAL OIL PUMP - This key is operational in any
mode. Press and release this key to run the oil pump.
Press and release the key again to stop the oil pump. A
10-minute maximum is imposed on the running of the
oil pump (i.e., the oil pump will automatically shut off
after 10 minutes). If a longer running time is desired,
the key must be pressed again.
DISPLAY DATA - This key is operational in any three of
the Control Center modes of operation (“SERVICE”, “LO-
CAL” or “REMOTE”). It is used to display certain sys-
tem operating parameters that are relevant to trouble-
shooting the chiller system.
Press and hold the “DISPLAY DATA” key. The following
messages will sequentially scroll on the display. Each
message will be displayed for 2 seconds.
No. 1
SAT TEMPS EVAP = XX.X °F, COND = XX.X °F
No. 2
DISCHARGE TEMP = XXX.X °F, OIL TEMP = XXX.X °F
No. 3
PURGE PRESSURE = XX.X PSIA
No. 4 (See Note below)
60 MINUTE PURGE COUNT BYPASS; XX MIN LEFT
Purge exhausts are not counted during the first 60 min-
utes of chiller operation. Therefore, this message re-
places the purge count messages below during the first
hour of operation.
PURGES LAST XX MIN = XX, MAX PURGES/HR = XX
After the first hour of chiller operation has elapsed, purge
exhausts are counted. This message is displayed dur-
ing the first hour following the initial 1 hour bypass (see
above), and after the excess purge message is cleared.
The minutes elapsed during this first hour of purge ex-
haust counting are displayed. The purge count is
incremented each time a purge exhaust occurs. Also,
the excess purge threshold that has been programmed
by the operator or service person is displayed as MAX
PURGES/HR. When the minute count reaches 60, this
message is replaced with the following message:
PURGES LAST HOUR = XX; MAX PURGES/HR = XX
After the initial 1 hour bypass and the first hour of purge
exhaust counting has elapsed as explained above (2
hours of chiller run time), this message is displayed
thereafter. A running total of the number of purge exhausts
that have occurred within the last hour is displayed. The
excess purge threshold that has been programmed by
the operator or service person is displayed as MAX
PURGES/HR.
To hold each of the above messages, press and release
the “DISPLAY DATA” key, then press and release the
“DISPLAY HOLD” key. Message No. 1 above will be dis-
played and updated every 2 seconds until the “DISPLAY
DATA” key is again pressed and released. Message No.
2 is then displayed and updated every 2 seconds until
the “DISPLAY DATA” key is again pressed and released.
Message No. 3 is then displayed and updated every 2
seconds until either the “DISPLAY DATA” key is again
pressed and released (whereupon message No. 1 is
displayed), or the “DISPLAY HOLD” key is pressed and
released (whereupon the “DISPLAY DATA” messages
are removed from the display.)
NOTE: Purge Count - following a 1 hour bypass at start,
purge exhausts are counted and displayed in
the above messages while the chiller is running.
With the exception of the first hour after the by-
pass, the value displayed is the number of ex-
hausts that have occurred in the “Last Hour”.
For example, if you walk up to the Micro Panel
at 9:11 AM and press the “DISPLAY DATA” key