Section 9 - Service And Troubleshooting; Clearing History Buffers; Service Mode - Outputs; Service Mode - Condensing Unit Configuration - York YLUA0078 Installation Operation & Maintenance

FORM 150.73-NM1
ISSUE DATE: 09/04/2020
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. Important
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 unit 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; PRO-
GRAM, 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
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.
Following is the order of outputs that will appear as the
ENTER/ADV key is pressed:
JOHNSON CONTROLS
H I S T O R Y
= Y E S
SYS 1 COMP 1 STATUS TB7-2 IS:
SYS 1 LLSV STATUS TB7-3 IS:
SYS 1 COMP 2 STATUS TB7-4 IS:
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
A display may 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 sole-
noid valve is OFF, and the output connection from the
microboard is coming from Terminal Block 10 – pin 3.
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. Energizing and
de-energizing outputs may be useful during trouble-
shooting.
S T A T U S
I S O F F
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