YORK INTERNATIONAL
67
FORM 150.62-NM7 (103)
SYS SWITCH OFF tells that the system switch under
OP TIONS is turned off. The system will not be allowed
to run until the switch is turned back on.
This message informs the operator that the chilled liq-
uid temperature is below the point (determined by the
setpoint and control range) that the micro will bring on
a system or that the micro has not loaded the lead sys-
tem far enough into the loading sequence to be ready
to bring the lag system ON. The lag system will display
this mes sage until the loading sequence is ready for the
lag sys tem to start.
The COMPS RUNNING message indicates that the
re spec tive system is running due to demand. The “X”
will be replaced with the number of compressors in that
sys tem that are running.
The anti-recycle timer message shows the amount of
time left on the respective sys tems anti-recycle timer.
This message is displayed when the system is unable
to start due the anti-recycle timer being active.
The anti-coincidence timer is a software feature that
guards against 2 systems starting si mul ta neous ly. This
as sures instantaneous starting current does not be come
ex ces sive ly high due to simultaneous starts. The micro
limits the time between compressor starts to 1 minute
re gard less of demand or the anti-recycle timer being
timed out. The anti-coincidence timer is only present
on two system units.
When this message appears, discharge pressure lim it ing
is in effect. The Discharge Pressure Lim it ing fea ture
is integral to the standard software control; how ev er
the discharge trans duc er is optional on some mod els.
There fore, it is im por tant to keep in mind that this con-
trol will not func tion unless the discharge trans duc er is
in stalled in the system.
The limiting pressure is a factory set limit to keep the
system from faulting on the high discharge pressure
cut out due to high load or pull down conditions. When
the unload point is reached, the micro will au to mat i cal ly
un load the affected system by deenergizing one com-
pres sor. The discharge pressure unload will occur
when the discharge pres sure gets within 15 PSIG of
the pro grammed dis charge pres sure cutout. This will
only hap pen if the system is fully loaded and will shut
only one com pres sor off. If the sys tem is not fully loaded,
dis charge limiting will not go into effect. Reloading the
af fect ed system will occur when the dis charge pres sure
drops to 85% of the un load pres sure and 10 minutes
have elapsed.
S Y S 1 N O C O O L L O A D
S Y S 2 N O C O O L L O A D
S Y S 1 S Y S S W I T C H O F F
S Y S 2 S Y S S W I T C H O F F
S Y S 1 A R T I M E R X X S
S Y S 2 A R T I M E R X X S
S Y S 1 C O M P S R U N X
S Y S 2 C O M P S R U N X
S Y S 1 A C T I M E R X X S
S Y S 2 A C T I M E R X X S
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
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