36
YORK INTERNATIONAL
GENERAL
Pushing the PROGRAM key allows the user to pro-
gram “8” system operating limits. These limits include
cut-out points for safeties, anti-recycle timer duration,
and the reaction time of the microprocessor to abrupt
changes in the chilled water temperatures.
After the PROGRAM key is pressed, the micro will
first respond by displaying the DISCHARGE CUT-OUT.
As the “8” limits are displayed, they may be repro-
grammed using the “12” ENTRY keys. New values will
be programmed into memory when the ENTER key is
pushed. The ENTER key must also be used to ad-
vance the display the operator views the “10” system
operating limits. Each time the key is pushed, the dis-
play will advance to the next limit.
If the operator attempts to enter an unacceptable value,
the micro will respond with a momentary message in-
dicating the value selected has been ignored. This er-
ror message is shown:
The “8” programmable limit displays are shown and
described below along with the range of values which
the microprocessor will accept for each limit.
THESE
VALUES MUST BE CHECKED AND PROPERLY PRO-
GRAMMED WHEN COMMISSIONING THE CHILLER.
FAILURE TO PROPERLY PROGRAM THESE VALUES
MAY CAUSE DAMAGE TO THE CHILLER OR OPERA-
TION PROBLEMS.
DISCHARGE CUT-OUT
The DISCHARGE CUT-OUT is a microprocessor back-
up for the mechanical high pressure cut-out located in
each refrigerant circuit. Typically YCU chillers with air-
cooled condensers should have the cut-out set at 395
PSIG.
To program the DISCHARGE CUT-OUT, key in the de-
sired value and press the ENTER key. The new value
will be entered into memory and the display will ad-
vance to the next user programmable limit.
The micro will accept a range of programmable values
between 200-399 PSIG for this cut-out. For this cut-out
to be functional, the Discharge Pressure Readout Op-
tion must be installed.
NOTE: It is required to first key in a “0” when pro-
gramming this cut-out (Example: 0395 PSIG).
More details on this safety are outlined in the SYSTEM
SAFETIES section.
OUTSIDE AIR TMP LOW CUT-OUT
“PROGRAM” KEY
PROGRAMMING USER PROGRAMMABLE SAFETIES & LIMITS
26572A(D)
O U T O F R A N G E
T R Y A G A I N !
D I S C H A R G E C U T O U T
= 3 9 5 P S I G
O U T S I D E A I R T M P L O W
C U T O U T = 2 5 . 0 F
PROGRAM KEY
