52
YORK INTERNATIONAL
DUAL CIRCUIT UNITS
FAULT CODES AND SYSTEM SAFETIES
MEANING OF THE “F” DISPLAY
Any time an “F” appears on the display, one or both com-
pressors will be shut down on a safety control. At this
time the operator should turn the “SELECT DATA DIS-
PLAY” rotary switches to the number “18”. When this is
done, a Fault Code (0-11) will appear which can be com-
pared to the “FAULT Code” list on the control panel to
determine the reason for system failure. A list of the faults
and their respective code number is also shown below.
FIG. 39 – FAULT CODES
Code
Description
Number
of Fault.
No Fault
Micro detected low/hi motor current
or
External hi pressure cutout
or
External motor overload
Low Oil Pressure, PSID (kPaD x 10)
Low suction pressure, PSIG (kPaG x 10)
Micro detected high pressure cutout
Micro detected low/hi motor current
or
External hi pressure cutout
or
External motor overload
Low oil pressure, PSID (kPaD x 10)
Low suction pressure, PSIG (kPaG x 10)
Micro detected high pressure cutout
High ambient temperature
Low ambient temperature
Low water temperature
0.
1.
System 1
2.
3.
4.
5.
➤➤➤➤➤
➤➤➤➤➤
System 2
6.
7.
8.
9.
10.
11.
An “F” Code overrides any other letter code display which
may appear. See the MANUAL RESET FAULTS and
AUTOMATIC RESET FAULTS Section for a more de-
tailed explanation of the fault codes. (Pages 53 & 54.)
When a FAULT occurs, the micro will shut the system
down. Auto-restart is determined by the type of fault plus
the number of times the fault has occurred in the last 90
min. Details of auto-restart will follow.
At the time of the Fault which caused the “F” code to be
displayed, the microprocessor stores operating data on
both systems at the instant of shutdown. Any display
selected by the operator will show stored data. This data
will remain in storage until the SYSTEM ON/OFF Switch
for the faulted compressor is placed in the OFF posi-
tion. This clears the microprocessor’s memory of stored
data, and any data display at this time will be of current
system conditions. It also allows the faulted compres-
sor to start.
Before placing the SYSTEM ON/OFF Switch to the OFF
position, the operator may (via the “SELECT DATA DIS-
PLAY” rotary switches) select the parameter which
caused the fault, and any other related system function,
and view their magnitudes at the time of the failure. This
can provide valuable trouble-shooting information. De-
tailed explanations of all system safeties will follow in
this section.
LD01868
