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4.5
HISTORY KEY
If a safety shutdown occurs on the chiller, a compre-
hensive list of operating and programmed settings data
is stored by the microprocessor. The information is
stored at the instant of the fault, regardless of whether
the fault caused a lockout to occur. This information is
not affected by power failures or manual resetting of a
fault lockout.
The microprocessor stores data for up to 6 safety shut-
downs on 2-System units and 4 safety shutdowns on 3-
or 4-compressor units. Once this limit is reached, a fur-
ther shutdown will cause the oldest set of data to be
discarded in favor of storing the new shutdown data.
The Safety Shutdowns are numbered from 1 to 6 with
number 1 always being the most recent.
If a remote printer is not connected, pressing the His-
tory key allows the operator to locally scroll through
information relating to the stored safety shutdowns on
the control panel display.
If a remote printer is connected, pressing the History
key will cause data from the last 6 shutdowns on a 2-
compressor chiller or 4 shutdowns on a 3- or 4-com-
pressor chiller to be transmitted from the microproces-
sor to the remote printer. The printout will begin with
the most recent fault which occurred. This does not af-
fect the stored data and as many prints as desired may
be taken. See Section 4.7 for a HISTORY printout
sample.
4.6
FAULT HISTORY DATA –
LOCAL DISPLAY MESSAGES
When the History key is pressed, the following mes-
sage will appear:
D I S P L A Y
S A F E T Y
D O W N
N O . 1
To select a Safety Shutdown, press the appropriate key
on the numeric key pad then press Enter. Remember
that the most recent fault information is stored as shut-
down No. 1. After the ENTER Key is pressed, a mes-
sage indicating the time and date of the Fault Shutdown
will appear.
S H U T D O W N
5 : 5 9 A M
2 9
YORK INTERNATIONAL
S H U T -
( 1
T O
6 )
O C C U R R E D
N O V
9 8
Repetitively pressing the
through the information available in the Safety Shut-
down buffer. This is divided into Common (Whole
Chiller) Data and Individual System Data displays as
follows:
Common Data:
S Y S
1
N O
F A U L T S
S Y S
2
H I G H
This message indicates the fault that caused the shut-
down; in this case, a high motor current in System 2
was the cause of the shutdown.
S 1 - 1
C H I L L E D
W A T E R
This message displays the type of chilled liquid selected
(water or glycol) at the time of the fault.
S 1 - 2
A M B I E N T
L O W
A M B I E N T
This display indicates whether standard or low ambi-
ent operation was selected at the time of the fault.
S 1 - 3
R E F R I G E R A N T
R - 2 2
This message indicates the type of refrigerant that was
programmed at the time of the fault (R-22 or R407C).
D I S C H A R G E
C U T O U T
=
This message indicates the discharge pressure cutout
programmed at the time of the fault.
D I S C H A R G E
U N L O A D
=
This display provides the discharge pressure unload
point, programmed at the time of the fault.
S U C T I O N
P R E S S U R E
C U T O U T
=
This message displays the suction pressure cutout pro-
grammed at the time of the fault.
FORM 201.18-NM8
áâ
Keys allows scrolling
M T R
C U R R
L I Q U I D
C O N T R O L
P R E S S U R E
2 7 . 2
B A R
P R E S S U R E
2 5 . 9
B A R
3 . 0
B A R
127
9
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