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5.5 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 lock-out to occur. This information
is not affected by power failures or manual resetting of
a fault lock-out.
The microprocessor stores data for up to 6 safety shut-
downs on 2 refrigerant circuit models. Once this limit
is reached, a further shutdown will cause the oldest set
of data to be discarded in favor of storing the new shut-
down data. The safety shutdowns are numbered in se-
quence, number 1 always being the most recent.
On two system units the six history buff-
ers contain information on both systems.
There is a total of six history buffers not
6 buffers per system. Thus on a fault
shutdown on No. 2 system the normal
operating condition of No. 1 system will
also be recorded.
When no remote printer is connected, pressing the
'HISTORY' key allows the operator to locally scroll
through information relating to the stored safety shut-
downs on the control panel display.
If a remote printer is connected, pressing the 'HISTORY'
key will send the safety shutdown data 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.
5.6 HISTORY – LOCAL DISPLAY MESSAGES
When the 'HISTORY' key is pressed, the following
message 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'. Remem-
ber that the most recent fault information is stored as
shutdown No. 1.
After the 'ENTER' Key is pressed, a message indicat-
ing the time and date of the Fault Shutdown will appear:
YORK INTERNATIONAL
S H U T -
( 1
T O
6 )
Repetitively pressing the
through the information available in the safety shutdown
buffer. This is divided into common data (whole chiller)
and individual system data displays as follows:
Common Data:
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 H U T D O W N
5 : 5 9 A M
2 9
The next series of messages display the programmed
settings for the following parameters at the time of the
fault.
• Chilled liquid type (water or glycol)
• Ambient temperature control (standard or low)
• Refrigerant type (R-22)
• Discharge pressure cutout setting
• Discharge pressure unload point
• Suction pressure cutout setting
• High ambient temperature cutout setting
• Low ambient temperature cutout setting
• Low leaving chilled liquid cutout setting
• High motor current unload point
• Control mode (remote or local)
• Lead/lag control (manual or automatic)
S 1 - 1
C H I L L E D
W A T E R
S 1 - 2
A M B I E N T
L O W
A M B I E N T
S 1 - 3
R E F R I G E R A N T
R - 2 2
S 1 - 4
Y C R S
D I S C H A R G E
C U T O U T
=
2 9 7 . 0
D I S C H A R G E
U N L O A D
=
2 6 5 . 0
FORM 201.25-NM1 (302)
keys allows scrolling
O C C U R R E D
N O V
9 8
L I Q U I D
C O N T R O L
P R E S S U R E
P S I G
P R E S S U R E
P S I G
55
7
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