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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
affect the stored data and as many prints as desired
may be taken. See Section 9 (4.7) for a HISTORY print-
out sample.
Information contained in the SAFETY SHUTDOWN
buffers is very important when attempting to trouble-
shoot a system problem. This data reflects the system
conditions at the instant the fault occurred and often
reveals other system conditions which actually caused
the safety threshold to be exceeded.
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 keypad 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
9 : 5 5
P . M .
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.
YORK INTERNATIONAL
S H U T -
( 1
T O
6 )
O C C U R R E D
2 3
S E P T
0 1
Keys allows scrolling
M T R
C U R R
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 ambient
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 R-407C).
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.
H I G H
A M B I E N T
C U T O U T
=
4 6 . 1 ° C
This message indicates the High Ambient Temperature
Cutout at the time of the fault.
L O W
A M B I E N T
C U T O U T
=
- 3 . 9 ° C
This display shows the Low Ambient Cutout pro-
grammed at the time of the fault.
FORM 150.52-NM2 (1001)
L I Q U I D
C O N T R O L
P R E S S U R E
2 5 . 9
B A R
P R E S S U R E
2 4 . 8
B A R
3 . 0
B A R
T E M P
T E M P
129
9
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