131
YORK INTERNATIONAL
FORM 150.52-NM2 (1001)
History Key:
When the History key is pressed, the following mes-
sage will appear:
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 Number 1. Repetitively pressing the ENTER key
now scrolls through the information available in the Safety
Shutdown buffer.
4.7 FAULT HISTORY DATA –
REMOTE PRINTOUT
A printout history of unit and system operating condi-
tions, at the time of the fault, can be obtained by press-
ing the HISTORY Key with an optional printer installed.
2-compressor chillers will provide a history printout on
the last 6 faults and 3 and 4-compressor chillers will
provide printouts on the last 4 faults. Printouts for 2, 3
and 4-compressor models will be similar. The most re-
cent fault will always be stored as Safety Shutdown
No. 1.
An example of the HISTORY Printout is shown on the
following page.
This message shows the system differential oil pres-
sure at the time of the fault.
This message indicates the system oil line temperature
at the time of the fault.
These messages indicate compressor suction gas satu-
ration temperature and superheat at the time of the fault.
This message, which is only displayed if the unit is in
R-407C mode, indicates the refrigerant temperature at
the inlet of the cooler.
This message indicates the Liquid Line Solenoid Valve
and the economizer Hot Gas Solenoid Valve position:
ON = Energized / OFF = De-Energized (OFF) at the
time of the fault.
This message indicates the stage of condenser fan op-
eration on the system. See Section 8.4 for details of fan
staging.
S# SAT SUCT= - 0 . 2°C
SUCT SHEAT = - 9 . 6 °C
SYS # COOLER INLET
REFR I G TEMP = - 0 . 9 °C
SYS # LLSV I S ON
HOT GAS SOL I S OFF
SYS # FAN STAGE 3
DI SPLAY SAFETY SHUT-
DOWN NO . 1 ( 1 TO 4 )
SYS # OI L= 4 . 8 BAR
SP= 5 9 DP=1 5 . 7 BAR
SYS # OI L= 46 . 8 °C
ST= 8 . 1 °C
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