York YLUA0248 Series Installation Operation & Maintenance page 107

FORM 150.73-NM2
ISSUE DATE: 09/07/2020
History Displays
The HISTORY key gives the user access to many unit
and system operating parameters at the time of a unit
or system safety shutdown. When the HISTORY key is
pressed the following message is displayed.
D I S P L A Y S A F E T Y
D O W N N O .
While this message is displayed, the ↑ (UP) arrow key
can be used to select any of the six history buffers. Buf-
fer number 1 is the most recent, and buffer number 6 is
the oldest safety shutdown that was saved.
After selecting the shutdown number, pressing the EN-
TER key displays the following message which shows
when the shutdown occurred.
S H U T D O W N
0 3 : 5 6 P M
Pressing the ↓ (DOWN) arrow key repeatedly from the
DISPLAY SAFETY SHUTDOWN NO. X displays the
software version.
S O F T W A R E
C . M 0 8 . 1 4 . 0 2
The ↑ (UP) and ↓ (DOWN) arrow keys are used to
scroll forward and backward through the history buffer
to display the shutdown conditions stored at the instant
the fault occurred. The ↓ (DOWN) arrow key scrolls
through the displays in the order they appear below:
U N I T
L O W S U C T
Displays the type of fault that occurred.
U N I T
C O N D E N S I N G
Displays the type of unit; Liquid, Condensing Unit or
Heat Pump.
A M B I E N T
X X X X X X X X X X
Displays the type of Ambient Control; Standard or
Low Ambient.
JOHNSON CONTROLS
S H U T-
1 ( 1 T O 6 )
O C C U R R E D
2 9 J A N 0 2
V E R S I O N
F A U L T :
P R E S S
T Y P E
U N I T
C O N T R O L
L O C A L / R E M O T E
X X X X X X X X X
Displays Local or Remote control selection.
C O N T R O L
S U C T I O N
Displays the type of DSCH Air Temp Control (OAT or
Suct Press.
L E A D / L A G
X X X X X X X X
Displays the type of lead/lag control; Manual System
1, Manual System 2 or Automatic. This is only select-
able on 2-system Units.
F A N C O N T R O L
D I S C H A R G E
Displays the type of fan control; Discharge Pressure or
Ambient and Discharge Pressure.
M A N U A L O V E R R I D E
X X X X X X X X X
Displays whether Manual Override was Enabled or
Disabled.
C U R R E N T
X X X X X X X X X X X X X X X X
Displays type of Current Feedback utilized.
S O F T
X X X X X X X
Displays whether the optional European Soft Start was
installed and selected.
D I S C H A R G E
C U T O U T =
Displays the programmed Discharge Pressure Cutout.
S U C T I O N P R E S S U R E
C U T O U T =
Displays the programmed Suction Pressure Cutout.
SECTION 7 – UNIT CONTROLS
M O D E
M O D E
P R E S S U R E
C O N T R O L
P R E S S U R E
M O D E
F E E D B A C K
S T A R T
P R E S S U R E
X X X X P S I G
X X X X P S I G
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