YORK INTERNATIONAL 19
FORM 150.40-NM25
CONTROL PANEL DATA DISPLAY LETTER CODES
SINGLE CIRCUIT UNITS
The 4 digit display is capable of providing the operator
with a direct readout of system pressures, temperatures,
and setpoints. This information can be manually selected
and viewed in the “3” rightmost digits of the display. The
leftmost digit automatically displays a letter code indi-
cating system status. Listed below are the meanings of
the letter codes. These codes are also explained in “SYS-
TEM MONITORING OR DIAGNOSIS’’ on the control
panel.
Leftmost Digit no letter (Blank). Informs the op-
erator that both compressors are ready to run or
are running.
A – Indicates that the Flow Switch is open, time clock
is telling the system to turn off, or a remote cy-
cling device (EMS, BAS, etc.) is telling the sys-
tem to turn off. These are devices whose dry
contacts may be connected in series across ter-
minals 3 and 4 of the terminal block in the lower
left side of the Power Section.
FIG. 13 – DATA DISPLAY LETTER CODES
c – Shows that the compressor is shut down and
cycling on the 2-minute start-up or 10-minute an-
ti-recycle timer. It will be available for start or will
restart when the 2-minute start-up and 10-minute
anti-recycle timers time out, and demand allows.
The “c” code will disappear as soon as the tim-
ers time out.*
F – Indicates that a safety threshold has been ex-
ceeded and the unit is shut down on a Fault. Turn
the Select Data Display to “18” to determine the
reason for shutdown. (See list page 20.)
H – Indicates that the compressor is off because
cooling demand is not present. The compressor
will start as soon as cooling demand is required.
The “H” code will override “c” code.
*See page 23 for details on the Anti-Recycle Timers.
LD01852
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