Section 3 Service And Troubleshooting - York YCUL0045 Installation Operation & Maintenance

CLEARING HISTORY BUFFERS
The history buffers may be cleared by pressing the HIS-
TORY key and then repeatedly pressing the UP arrow
key until you scroll past the last history buffer choice.
The following message will be displayed:
I N I T I A L I Z E
I
E N T E R
Pressing the ENTER/ADV key at this display will cause
the history buffers to be cleared. Pressing any other key
will cancel the operation.
DO NOT CLEAR BUFFERS. Impor-
tant information may be lost. Contact
factory service.
SOFTWARE VERSION
The software version may be viewed by pressing the
HISTORY key and then repeatedly pressing the DOWN
arrow key until you scroll past the first history buffer
choice. The following message is an example of what
will be displayed:
S O F T W A R E
C . M M C . 0 1 . 0 1
SERVICE MODE
Service Mode is a mode that allows the user to enable
or disable all of the outputs (except compressors) on the
unit, change chiller configuration setup parameters and
view all the inputs to the microboard.
To enter Service Mode, turn the unit switch off and press
the following keys in the sequence shown; PROGRAM,
UP ARROW, UP ARROW, DOWN ARROW, DOWN
ARROW, ENTER. Service Mode will time out after 30
minutes and return to normal control mode, if the panel is
accidentally left in this mode. Otherwise, turning the unit
switch on will take the panel out of Service Mode.
SERVICE MODE – OUTPUTS
After pressing the key sequence as described, the con-
trol will enter Service Mode permitting the outputs
(except compressors), operating hours, refrigerant
JOHNSON CONTROLS
SERVICE AND TROUBLESHOOTING
H I S T O R Y
= Y E S
V E R S I O N
type, expansion valve type, and start/hour counters to
be viewed/modified. The ENTER/ADV key is used to
advance through the outputs. Using the UP/DOWN AR-
ROW keys will turn the respective digital output on/off
or modify the value.
Following is the order of outputs that will appear as the
ENTER/ADV key is pressed:
SYS 1 COMP 1 STATUS TB3-2 IS:
SYS 1 LLSV STATUS TB3-3 IS:
SYS 1 COMP 2 STATUS TB3-4 IS:
SYS 1 COMP 3 STATUS TB3-5 IS:
SYS 1 HGBP STATUS TB3-6 IS:
SYS 2 COMP 1 STATUS TB3-8 IS:
SYS 2 LLSV STATUS TB3-9 IS:
SYS 2 COMP 2 STATUS TB3-10 IS:
SYS 2 COMP 3 STATUS TB4-1 IS:
SYS 1 FAN OUTPUT 1 TB4-2 IS:
SYS 1 FAN OUTPUT 2 TB4-4 IS:
SYS 1 FAN OUTPUT 3 TB4-5 IS:
SYS 2 FAN OUTPUT 1 TB4-6 IS:
SYS 2 FAN OUTPUT 2 TB4-8 IS:
SYS 2 FAN OUTPUT 3 TB4-9 IS:
SYS 1 ALARM STATUS TB5-1 IS:
SYS 2 ALARM STATUS TB5-2 IS:
EVAP PUMP STATUS TB5-3 IS:
ANALOG OUTPUT 3 J10 - 5, 6 = :
ANALOG OUTPUT 4 J10 - 7, 8 = :
Each display will also show the output connection on the
microboard for the respective output status shown.
For example:
S Y S 1 L L S V
T B 3 - 2
This display indicates that the system 1 liquid line so-
lenoid valve is OFF, and the output connection from the
microboard is coming from terminal block 3 - pin 2.
Pressing the UP Arrow key will energize the liquid line
solenoid valve and OFF will change to ON in the display
as the LLSV is energized.
It should be noted that some of the out-
puts, such as Evaporator Heater only
apply to units configured as chillers
and do not apply to condensing units.
FORM 150.63-NM6 (1020)
S T A T U S
I S O F F
121
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