JOHNSON CONTROLS
84
FORM 150.62-NM8 (1020)
UNIT CONTROLS
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
The COMPS RUNNING message indicates that the
respective system is running due to demand. The “X”
will be replaced with the number of compressors in that
system that are running.
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
The anti-recycle timer message shows the amount of
time left on the respective systems anti-recycle timer.
This message is displayed when the system is unable to
start due the anti-recycle timer being active.
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
The anti-coincidence timer is a software feature that
guards against 2 systems starting simultaneously.
This assures instantaneous starting current does not
become excessively high due to simultaneous starts.
The microprocessor limits the time between compressor
starts to 1 minute regardless of demand or the anti-
recycle timer being timed out. The anti-coincidence
timer is only present on two system units.
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
When this message appears, discharge pressure limiting
is in effect. The
discharge pressure limiting feature
is integral to the standard software control; however
the discharge transducer is optional on some models.
Therefore, it is important to keep in mind that this
control will not function unless the discharge transducer
is installed in the system.
The limiting pressure is a factory set limit to keep the
system from faulting on the high Discharge Pressure
Cutout due to high load or pull down conditions.
When the unload point is reached, the microprocessor
will automatically unload the affected system by
de-
energizing one compressor. The discharge pressure
unload will occur when the discharge pressure gets
within 15 psig of the programmed Discharge Pressure
Cutout. This will only happen if the system is fully
loaded and will shut only one compressor off. If the
system is not fully loaded, discharge limiting will not
go into effect. Reloading the affected system will occur
when the discharge pressure drops to 85% of the unload
pressure and 10 minutes have elapsed.
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
When this message appears, suction pressure limiting is
in effect. Suction
pressure limiting is only available on
units that have the suction pressure transducer installed.
If a low pressure switch is installed instead, suction
pressure limiting will not function.
The suction pressure limit is a control point that limits
the loading of a system when the suction pressure drops
to within 15% above the Suction Pressure Cutout. On a
standard system programmed for 44 psig/3.0 bar Suction
Pressure Cutout, the microprocessor would inhibit
loading of the affected system with the suction pressure
less than or equal to 1.15 x 44 psig/3.0 bar equals 50
psig/3.5 bar. The system will be allowed to load after 60
seconds and after the suction pressure rises above the
suction pressure limit point.
S Y S 1 L O A D L I M I T X X %
S Y S 2 L O A D L I M I T X X %
This message indicates that load limiting is in effect and
the percentage of the limiting in effect. This limiting
could be due to the load limit/PWM input, ISN or RCC
controller could be sending a load limit command.
M
A N
U A L
O
V E R
R I D E
If Manual Override mode is selected, the STATUS
display will display this message. This will indicate that
the daily schedule is being ignored and the chiller will
startup when chilled liquid temperature allows, Remote
Contacts, Unit Switch and system switches permitting.
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. Manual Override mode
automatically disables itself after 30 minutes.
Содержание YCAL0014E Series
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