York YCAV0569, Installation Operation & Maintenance

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JOHNSON CONTROLS
FORM 201.21-NM2 (616)
MICRO PANEL
LD10605
SERVICE
KEY
SERVICE KEY
SERVICE Key Operation
The Service Key allows viewing data related to the in-
ternal function of the chiller system electronics. Data
such as circuit board output status as controlled by the
Chiller Control software while operating can be viewed
and compared to actual chiller operation in the event
servicing is required. The Service Key allows control-
ling of analog and digital outputs for troubleshooting
purposes when the unit is not running. The Unit Serial
Number and Optimized IPLV Control mode are also
entered using the Service Key.
The ▲▼ (ARROW) keys allow scrolling through the
displays. The ▼ (ARROW) key scrolls through the
displays in the forward direction.
When the SERVICE key is pressed, the following mes-
sage will appear:
XXXX will display a password, if a numerical password
is entered.
SERVICE MODE XXXX
PRESS ENTER KEY TO CONTINUE
Pressing the

(ENTER) key allows “view only” Service
Mode operation. All control board I/O will be view-
able in this mode. No outputs can be changed. For
troubleshooting or start-up commissioning purposes,
the Chiller Micro Board and some VSD outputs can be
toggled or changed by turning off the UNIT SWITCH,
pressing the SERVICE Key, entering password 9675,
and pressing the

(ENTER) key. Once the password
is entered, the Digital Outputs (DO) can be toggled by
pressing the

(ENTER) key. The Analog Outputs can
be programmed to output a specific value using the key-
pad and programming in the desired value, which will
usually be noted as a % or VDC. If the UNIT SWITCH
is turned back on, the chiller will revert to normal view-
able only control.
Displays can be viewed by pressing the ▲ and ▼ (AR-
ROW) keys. The ▼ (ARROW) key scrolls through the
displays in the forward direction.
The
◄
and
►
(ARROW) keys allow jumping from data
section to data section to avoid scrolling sequentially
through all the data. Once in a data section, the ▲ and ▼
(ARROW) keys allow scrolling through the data under
the section. Pressing the ◄ and ► (ARROW) keys at
any time moves to the top of the next data section.