FORM 201.25-NM1 (302)
41
YORK INTERNATIONAL
Anti-Recycle Timers:
Shows the amount of time remaining on the anti-recycle
timer before a compressor can be called to restart.
These 300 - 600 second timers allow the motor cooling
to dissipate the heat generated by inrush current at start-
up. The timers begin timing when a compressor starts,
although a minimum of two minutes must always elapse
after a compressor shuts down, before it may again re-
start. If a power failure occurs, the anti-recycle timers
will reset to 120 seconds after power is restored.
Anti-Coincidence Timers:
Shows the amount of time remaining before the respec-
tive compressor can start. This display will only ap-
pear after the anti-recycle timers have timed out.
The anti-coincident timer guards against two or more
compressors starting simultaneously. This avoids ex-
cessive instantaneous starting currents. A minimum of
60 seconds between compressor starts is maintained
even if demand is present and the anti-recycle timers
are timed out.
Run Permissive and Flow Switch Contacts OPEN:
The flow switch must be connected to terminals 13 and
24 in the logic section. If a common start stop contact
is required it should be connected in series with the
flow switch. For individual system start stop contacts
connect flow switch to terminal 13 to feed the two start
stop contacts. Then connect No. 1 system start stop
contact to terminal 24 and No. 2 system start stop con-
tact to terminal 25. With the associated contact open
the ‘NO RUN PERM’ message will be displayed and
the associated systems will not run.
System Loading Requirement:
The chilled liquid temperature is below the point where
the microprocessor will bring the lead system on and/
or that the loading sequence has not loaded the chiller
far enough to bring the lag system on.
The lag system will display this message until the load-
ing sequence is ready for the lag system to start.
3.3 UNIT WARNINGS
Unit warnings indicate conditions which require op-
erator intervention to start the unit or extreme operat-
ing conditions. All setpoints and programmable values
should be checked, if a chiller shutdown occurred, be-
fore restarting the chiller. Unit warnings are not logged
into the ‘History Buffer’.
Low Battery Warning:
On power-up the microprocessor will check the RTC
(Real Time Clock) memory back-up battery to make
sure it is still operational. Provided the battery checks
out, operation will continue normally. If a check is made
and the battery has failed, the microprocessor will not
allow the chiller to run and the above ‘STATUS’ mes-
sage will appear.
If a low battery condition exists, the microprocessor
will restore programmed cutouts, setpoints, and sched-
ules to their default values.
Once a low battery condition is detected, the only way
to run the chiller is to use the ‘MANUAL OVERRIDE’
key. This allows reprogramming of setpoints, cutouts,
and schedule.
The RTC chip (U13) should be re-
placed immediately. Otherwise, the
chiller will shutdown and lose all pro-
grammed data, and require a
‘MANUAL OVERRIDE’ restart, if a
power failure occurs.
Pump Down:
Both refrigerant systems are in a pump-down cycle.
Pump down display messages occur on shutdowns
S Y S
#
A R
T I M E R
0
S
S Y S
#
A R
T I M E R
1 2 0
S
S Y S
#
C O M P
R U N N I N G
S Y S
#
A C
T I M E R
2 2
S
! !
L O W
B A T T E R Y
! !
C H E C K
P R O G / S E T P / T I M E
S Y S
#
N O
R U N
P E R M
S Y S
#
N O
R U N
P E R M
S Y S
#
N O
C O O L
L O A D
S Y S
#
N O
C O O L
L O A D
S Y S
1
P U M P I N G
D O W N
S Y S
2
P U M P I N G
D O W N
7
