York YLPA 0115SE, Installation, Operation And Maintenance Manual

Page: 39 / 90

39
JOHNSON CONTROLS
FORM 150.68-ICOM1
ISSUE DATE: 10/15/2020
The first message indicates the status (ON or OFF) of
each compressor in the system.
The second message indicates the system run time in
days - hours - minutes - seconds.
This is not accumulated run time but only
the current system cycle.
The third message indicates the system, and its current
status (OFF, COOLING, HEATING or DEFROST) and
the time in days - hours - minutes - seconds this state
has existed.
The fourth message indicates the system last state
previous to the current state.
The fifth message shows the current state of the system
mode solenoid valve ON or OFF.
The sixth message indicates what stage of condenser
fan operation is active.
PRINT Key
The PRINT key allows the operator to obtain a printout
of real-time system operating data or a printout of system
data at the instant of the fault on the last six faults which
occurred on the unit. An optional printer is required for
the printout.
Operating Data Print-out
Pressing the PRINT key and then OPER DATA key
allows the operator to obtain a printout of current system
operating parameters. When the OPER DATA key is
pressed, a snapshot will be taken of system operating
conditions and panel programming selections. This data
will be temporarily stored in memory and transmission
of this data is sent to the printer.
History Print-out
Pressing the PRINT key and then the HISTORY key
allows the operator to obtain a printout of information
relating to the last 6 Safety Shutdowns which occurred.
The information is stored at the instant of the fault,
regardless of whether the fault caused a lockout to occur.
The information is also not affected by power failures
or manual resetting of a fault lock-out.
When the HISTORY key is pressed, a printout is
transmitted of all system operating conditions which
were stored at the instant the fault occurred for each of
the 6 Safety Shutdowns buffers. The printout will begin
with the most recent fault which occurred. The most
recent fault will always be stored as Safety Shutdown
No. 1. Identically formatted fault information will then
be printed for the remaining safety shutdowns.
Information contained in the Safety Shutdown buffers is
very important when attempting to troubleshoot 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.
The history printout is identical to the operational
data printout with the exception of the header and the
schedule information which is not printed.
History Key
The HISTORY key displays unit and system operating
parameters at the time of a unit or system safety
shutdown.
Clearing History Buffers
The history buffers may be cleared by pressing the
HISTORY key and then repeatedly pressing the UP
ARROW key until you scroll past the last history buffer
choice. The following message will be displayed:
INITIALIZE HISTORY?
ENTER = YES
Pressing the ENTER/ADV key at this display will cause
the history buffers to be cleared. Pressing any other key
will cancel the operation.
History Messages
When the HISTORY key is pressed the following
message is displayed.
DISPLAY SAFETY SHUT-
DOWN NO. (1 TO 9)
While this message is displayed, the UP ARROW or
DOWN ARROW keys can be used to select any of the
six history buffers. Buffer number 1 is the most recent,
and buffer number 6 is the oldest saved safety shutdown.
After selecting the shutdown number, pressing the
ENTER key displays the following message which
shows when the shutdown occurred.
SHUTDOWN OCCURRED
12:00AM 18 JUN 71