Section 9: Service And Troubleshooting; Clearing History Buffers; Resetting System Lockout Faults; Service Mode - York YLAA0041 Installation Operation & Maintenance

Form 150.72-ICOM6
Issue date: 12/19/2023

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.

Resetting system lockout faults

If 3 faults on the same system occur within 90 minutes,
that system is locked out on the last fault. This condi-
tion requires a manual reset. Turn off and then turn on
the system switch (under OPTIONS key) to clear the
lockout fault. Fault messages are displayed whenever a
system is locked out.

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.
Johnson Controls

Section 9: Service and troubleshooting

H I S T O R Y
= Y E S

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 out-
put 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 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
DATA LOGGING TIMER X SECS
SOFT START (disabled)
REFRIGERANT TYPE (R-410A only)
EXPANSION VALVE TYPE (Thermostatic Only)
REMOTE TEMP RESET OPTION =
REMOTE INPUT SERVICE TIME =
9
185