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YORK INTERNATIONAL
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system far enough into the loading sequence to be ready
to bring the lag system or Slave Module ON. The lag
system and/or Slave Module will display this message
until the loading sequence is ready for the lag systems
to start (TEMPERATURE DEMAND in the OPER DATA
displays must be “5” or above before cooling load is
established for an additional system to run).
The COMP RUNNING message indicates that the re-
spective compressor is running due to demand.
The anti-recycle timer message shows the amount of
time left on the respective anti-recycle timer. This mes-
sage is displayed when demand requires the respec-
tive system to start but is being held off due to the timer.
The anti-coincident timer is a software feature that
guards against 2 compressors starting simultaneously.
This assures instantaneous starting current does not
become excessively high due to simultaneous starts.
The micro limits the time between compressor starts to
1 minute regardless of demand of the anti-recycle timer
being timed out. The time shown on the anti-coincident
timer is the time left on the timer before the respective
system will start. Demand must be present for the mes-
sage to be displayed and will only appear when the anti-
recycle timer has timed out.
The Suction Pressure Limiting message indicates a sys-
tem is being unloaded by the micro even though de-
mand requires loading. This safety assures that refrig-
erant returning to the compressor provides proper mo-
tor cooling, assuring that motor life is not compromised.
This safety will only activate when the chilled liquid tem-
perature is excessively high. Unloading will take place
when suction pressure exceeds the user programmable
threshold of 80-105 PSIG. Reloading will take place
when suction pressure drops to 10 PSIG below the
safety threshold.
Discharge Pressure Limiting takes affect when dis-
charge pressure nears the point at which the high pres-
sure cut-out will shut the system down causing total loss
of cooling. When this message appears, discharge pres-
sure has exceeded the user programmable threshold
and the micro is unloading the affected system to pre-
vent shutdown on a manual high pressure cut-out. Re-
loading will take place when discharge pressure has
dropped 60 PSIG below the threshold.
Optional discharge pressure transducers must be in-
stalled for this feature to operate. This is accomplished
by adding the Discharge Pressure Read-out option.
If the MANUAL OVERRIDE key is pressed, the STA-
TUS display will display the message shown above. This
will indicate that the Daily Schedule is being ignored
and the chiller will start-up when water temperature al-
lows, UNIT Switch permits, and SYSTEM Switches
permit.
This is a priority message and cannot be overridden by
anti-recycle messages, fault messages, etc. when in
the STATUS Display mode. Therefore, do not expect to
see any other STATUS messages when in the MANUAL
OVERRIDE mode. MANUAL OVERRIDE is to only be
used in emergencies or for servicing.
This message indicates that the Master Microproces-
sor Board has lost communications with the Slave Mi-
croprocessor Board. This loss of communications is nor-
mally a result of disconnecting the RS-485 communi-
cations cable between the two control panels.
FAULT STATUS MESSAGES
Fourteen possible fault messages may appear when
the STATUS key is pressed. Whenever a fault mes-
sage appears, the safety thresholds on the chiller have
been exceeded and the entire chiller or a single system
will be shut down and locked out. A detailed explana-
tion of the shutdown thresholds and associated infor-
mation related to each fault is covered in the SYSTEM
SAFETIES section (Page 57).
S Y S # 1 C O M P R U N N I N G
S Y S # 2 C O M P R U N N I N G
S Y S # 1 A R T M R X X X S
S Y S # 2 A R T M R X X X S
S Y S # 3 S U C T L I M I T I N G
S Y S # 4 S U C T L I M I T I N G
S Y S # 1 D S C H L I M I T I N G
S Y S # 2 D S C H L I M I T I N G
M A N U A L
O V E R R I D E
L O S S O F C O M M L I N K
T O S L A V E P A N E L
S Y S # 3 A R T M R X X S
S Y S # 4 A R T M R X X S