FORM 195.26-NM3
YORK INTERNATIONAL
33
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-coin-
cident timer is the time left on the timer before the
respective system will start. Demand must be present
for the message to be displayed and will only appear
when the anti-recycle timer has timed out.
The Suction Pressure Limiting message indicates a
system is being unloaded by the micro even though
demand requires loading. This safety assures that re-
frigerant returning to the compressor provides proper
motor cooling, assuring that motor life is not compro-
mised. This safety will only activate when the chilled
liquid temperature 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 effect 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
pressure has exceeded the user programmable thresh-
old and the micro is unloading the affected system to
prevent shutdown on a manual high pressure cut-out.
Reloading 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 Readout 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 ig-
nored and the chiller will start-up when water tempera-
ture allows, UNIT Switch permits, and SYSTEM
Switches permit.
This is a priority message and cannot be overriden 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.
FAULT STATUS MESSAGES
Ten possible fault messages may appear when the
STATUS key is pressed. Whenever a fault message
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 explanation of
the shutdown thresholds and associated information
related to each fault is covered in the SYSTEM SAFE-
TIES section (Page 46).
Chiller shutdown faults will shut the entire chiller down
and lock it out, while system shutdown faults will only
shut down and lock out the affected system (compres-
sor).
A list of the fault messages are shown below and on
the following page:
CHILLER FAULTS
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 # 1
A C T M R X X S
S Y S # 2
A C T M R X X S
S Y S # 1
S U C T L I M I T I N G
S Y S # 2
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
C H I L L E R F A U L T :
L O W A M B I E N T T E M P
C H I L L E R F A U L T :
H I G H A M B I E N T T E M P
C H I L L E R F A U L T :
1 1 5 V A C U N D E R V O L T A G E
DISPLAY KEYS
