YORK INTERNATIONAL
58
This message informs the operator that the micro has
commanded the auxiliary contacts (optional) for the
condenser water pump to close.
History
The HISTORY key also allows the user to scroll through
the SAFETY SHUTDOWN buffers to display informa-
tion relating to the last 3 Safety Shutdowns which oc-
curred. Information contained in the SAFETY SHUT-
DOWN Buffers is very important when attempting to
troubleshoot a system problem. This data reflects sys-
tem conditions at the
instant
the fault occurred.
Information is stored in the SAFETY SHUTDOWN Buff-
ers on every fault regardless of whether the fault caused
a Lockout to occur. The information is also not affected
by power failures (long term internal memory battery
back-up is built into the circuit board) or manual reset-
ting of a fault lock-out.
When the HISTORY key is passed, the following mes-
sage will appear.
The operator must then select which SAFETY SHUT-
DOWN Buffer which is desired. When deciding this,
keep in mind that Buffer No. 1 is always the most re-
cent fault. As new fault information is stored, it is al-
ways placed in Buffer No. 1, No. 1 is loaded to No. 2,
No. 2 is loaded to No. 3, and information previously in
No. 3 is discarded.
To select a buffer, simply press the 1, 2, or 3 EN-
TRY key and press ENTER. Repetitively pressing the
ENTER key will allow the operator to scroll through the
information available in the SAFETY SHUTDOWN
Buffer.
In the information that follows, a sample message along
with an explanation is provided for all available mes-
sages.
This message informs the operator of the time and date
of the fault.
This message informs the operator of the nature of the
fault which occurred.
This message indicates the Return Water Temperature
at the time of the fault.
This message indicates the Leaving Water Tempera-
ture at the time of the fault.
This display shows the Low Water Cut-out (Leaving)
which was programmed at the time of the fault.
This display shows the Setpoint Temp which was pro-
grammed at the time of the fault.
This message indicates the Outdoor Ambient Tempera-
ture at the time of the fault.
This display shows the Low Ambient Cut-out pro-
grammed at the time of the fault.
This display shows the Low Pressure Cut-out pro-
grammed at the time of the fault.
C O N D E N S E R
W A T E R
P U M P
S T A T U S
O F F
D I S P L A Y
S A F E T Y
S H U T -
D O W N
N O . 1
( 1
T O
3 )
S H U T D O W N
O C C U R R E D
3 : 2 4 P M
3 / 2 1 / 9 1
S Y S # 1
L O W
O I L
P R E S S
S Y S # 2
N O
F A U L T S
R E T U R N
W A T E R
T E M P
5 2 . 7
D E G F
L E A V I N G
W A T E R
T E M P
4 4 . 3
D E G F
L O W
W A T E R
C U T O U T
3 6 . 0
D E G F
S E T P O I N T
T E M P
4 4 . 0
D E G F
O U T S I D E
A I R
T E M P
7 7 . 6
D E G F
L O W
A M B I E N T
C U T O U T
3 5 . 0
D E G F
L O W
P R E S S U R E
C U T O U T
4 4
P S I G