YORK INTERNATIONAL
30
The DAILY SCHEDULE SHUTDOWN message indi-
cates that the schedule programmed into the CLOCK
SET SCHEDULE/HOLIDAY is keeping the chiller from
running.
Run Permissive is an indicator that an external cycling
contact (i.e. flow switch) connected to terminals 13 and
14 is open, or a system switch(es) on the Microproces-
sor Board is in the OFF position. Whenever the con-
tact is open or a switch is OFF, the NO RUN PERM will
be displayed.
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 the
lead system on, or that the micro has not loaded the
system far enough into the loading sequence to be
ready to bring the lag system ON. The lag system will
GENERAL
Pressing the STATUS key will enable the operator to
determine current chiller operating status as a whole
and as individual systems. The messages displayed
will include running status, cooling demand, fault sta-
tus, external cycling device status, and anti-recycle
timer status. The display will be a single message re-
lating to the highest priority message as determined
by the micro. Status messages fall into the categories
of General and Fault Status with each of the catego-
ries discussed below.
GENERAL STATUS MESSAGE
Each of the general status messages with a descrip-
tion of its meaning will follow. In the case of messages
which apply to individual systems, SYS 1 and SYS 2
messages will both be displayed and may be different.
Xs in the sample displays indicate numerical values
will appear in actual displays.
This message informs the operator that the UNIT
switch on the Control Panel is in the OFF position which
will not allow the chiller to run.
26572A(D)
STATUS KEY
STATUS
KEY
U N I T
S W I T C H
I S
I N
T H E
O F F
P O S I T I O N
D A I L Y
S C H E D U L E
S H U T D O W N
S Y S # 1
N O
R U N
P E R M
S Y S # 2
N O
R U N
P E R M
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