32
YORK INTERNATIONAL
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 respective
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 message 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 demand
requires loading. This safety assures that refrigerant re-
turning to the compressor provides proper motor cool-
ing, assuring that motor life is not compromised. This
safety will only activate when the chilled liquid tempera-
ture is excessively high. Unloading will take place when
suction pressure exceeds the user programmable thresh-
old of 80-105 PSIG. Reloading will take place when suc-
tion pressure drops to 10 PSIG below the safety thresh-
old.
Discharge Pressure Limiting takes affect when discharge
pressure nears the point at which the high pressure
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 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 STATUS
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 allows,
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.
FAULT STATUS MESSAGES
Thirteen possible fault messages may appear when the
STATUS key is pressed. Whenever a fault message ap-
pears, 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 re-
lated to each fault is covered in the SYSTEM SAFETIES
section (Page 52).
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 on the next page:
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 R
T M R
X X
S
S Y S # 2
A R
T M R
X X
S
M A N U A L
O V E R R I D E
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
