FORM 150.75-NM2
41
YORK INTERNATIONAL
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 status, ex-
ternal cycling device status, and anti-recycle timer sta-
tus. The display will be a single message relating to the
highest priority message as determined by the micro.
When System Status is being displayed, System 1 and
System 2 information will be displayed when the STA-
TUS key is first pressed. System 3 and 4 information
will be displayed if the STATUS key is pressed again.
Status messages fall into the categories of General and
Fault Status with each of the categories discussed be-
low.
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 or
SYS 3 and SYS 4 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.
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 contact
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
26572A(D)
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
STATUS
KEY
S Y S # 3
N O
C O O L
L O A D
S Y S # 4
N O
C O O L
L O A D
