Section 9 - Service And Troubleshooting; Clearing History Buffers; Service Mode; Service Mode - Outputs - York YLAA0285SE Manual

FORM 150.72-NM3 (1020)
ISSUE DATE 10/05/2020
SECTION 9 – SERVICE AND TROUBLESHOOTING

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:
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.

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
control will enter Service Mode permitting the outputs
(except compressors), operating hours, refrigerant
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 ↑ and ↓ (UP/
DOWN ) arrow keys will turn the respective digital
output on/off or modify the value.
The following is the order of outputs that will appear as
the ENTER/ADV key is pressed:
SYS 1 COMP 1 STATUS TB7-2 IS:
SYS 1 LLSV STATUS TB7-3 IS:
SYS 1 COMP 2 STATUS TB7-4 IS:
JOHNSON CONTROLS
H I S T O R Y
= Y E S
SYS 1 COMP 3 STATUS TB7-5 IS:
SYS 1 HGBP STATUS TB7-7 IS:
SYS 2 COMP 1 STATUS TB10-2 IS:
SYS 2 LLSV STATUS TB10-3 IS:
SYS 2 COMP 2 STATUS TB10-4 IS:
SYS 2 COMP 3 STATUS TB10-5 IS:
SYS 1 FAN OUTPUT 1 TB7-8 IS:
SYS 1 FAN OUTPUT 2 TB7-9 IS:
SYS 1 FAN OUTPUT 3 TB7-10 IS:
SYS 2 FAN OUTPUT 1 TB10-8 IS:
SYS 2 FAN OUTPUT 2 TB10-9 IS:
SYS 2 FAN OUTPUT 3 TB10-10 IS:
EVAP HEATER STATUS TB8-2 IS:
SYS 1 ALARM STATUS TB8-3 IS:
SYS 2 ALARM STATUS TB9-2 IS:
EVAP PUMP STATUS TB8-6,7 IS:
SYS 2 HGBV STATUS TB10-7 IS:
SPARE DO TB8-4 IS:
SPARE DO TB8-5 IS:
SPARE DO TB8-8, 9 IS:
SPARE DO TB9-4 IS:
SYS 1 EEV OUTPUT TB5-1, 2 = XXX%
SYS 2 EEV OUTPUT TB6-1, 2 = XXX%
SYS 1 COND FAN SPEED J15-1,5 = XXX%
SYS 2 COND FAN SPEED J15-2,6 = XXX%
SPARE AO J15-3,7 = XXX%
SPARE AO J15-4,8 = XXX%
DATA LOGGING MODE 1 = ON, 0 = OFF
DATA LOGGING TIMER X SECS
SOFT START (disabled)
REFRIGERANT TYPE (R410A only)
EXPANSION VALVE TYPE (Thermostatic Only)
REMOTE TEMP RESET OPTION =
REMOTE INPUT SERVICE TIME =
"NORTH AMERICAN FEATURE SET ENABLED"
HYDRO PUMP SELECTION
EVAP PUMP TOTAL RUN HOURS
SYS 1 HOURS
SYS 2 HOURS
SYS 1 STARTS
SYS 2 STARTS
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 10 - 3
This display indicates that the system 1 liquid line
solenoid valve is OFF, and the output connection from
the microboard is coming from Terminal Block 10 –
pin 3.
S T A T U S
I S O F F
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