Specifications

YORK INTERNATIONAL 41
FORM 160.48-O1
3. Using “entry” keys enter the appropriate access
code per above description.
4. As each digit is entered, the characters Y O R K
are displayed.
NOTE: If digits other than the correct digits are
entered, Y O R K is still displayed.
5. Press the “ENTER” key.
NOTE: If digits other than the correct digits were en-
tered in step No. 4,
INVALID ACCESS CODE
is displayed when the “ENTER” key is
pressed. If this occurs, enter the correct ac-
cess code and proceed.
6. The following message is displayed:
ACCESS TO PROGRAM KEY AUTHORIZED
NOTE: Unless terminated by pressing the “ACCESS
CODE” mode key again, the operator will
have access to the “PROGRAM” mode key
for 10 minutes. When 10 minutes have
elapsed, access to the “PROGRAM” mode
key will be automatically disabled and the
operator must return to step No. 1 to gain
access.
7. Press the “PROGRAM” mode key. The following
message is displayed:
PROGRAM MODE, SELECT SETPOINT
8. Press the “DISPLAY DATA” service key. This mes-
sage is displayed:
MAXIMUM PURGES PER HOUR = XX
9. Using the “ENTRY” keys, enter the desired value. Use
leading zeroes where necessary (i.e.: 06).
10. Press the “ENTER” key.
11. Press the “PROGRAM” mode key to exit “PRO-
GRAM” mode.
Purge Messages
The purge messages are displayed as part of the
scrolled messages using the “DISPLAY DATA” service
key as follows:
No. 1
PURGE PRESSURE = XXX PSIA
This message displays the pressure as sensed hy the
purge transducer.
No. 2
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.
No. 3
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:
No. 4
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 ex-
hausts that have occurred within the last hour is dis-
played. The excess purge threshold that has been pro-
grammed by the operator or service person displayed
as “MAX PURGES/HR”.
Excess Purge
Anytime after the first hour of chiller operation, if the
purge exhaust count equals the programmed “MAX
PURGES/HR” threshold,
DAY < TIME > WARNING – EXCESS PURGE
is alternately displayed with the normal foreground mes-
sage. The day and time displayed is the time the excess
purge event occurred. This message will be displayed
until manually cleared using the “WARNING RESET” ser-
vice key in “SERVICE” mode. Clearing the message also
resets the purge exhaust count to zero and invokes the
message:
PURGES LAST XX MIN = XX; MAX PURGES/HR = XX
While the excess purge message is displayed, the purge
exhaust count will continue to increment until the 1 hour
period has elapsed. The count is then frozen until the
excess purge message is cleared. This provides a record
of the total number of purge exhausts that occurred within
the 1 hour period that the excess purge event occurred.