CK721-A Network Controller Hardware Installation
24-10025-237 Rev. –
14
To replace the lithium battery:
1. Ensure that AC power is supplied to the panel.
2. With a narrow blade (1/8 in. blade) carefully pry up the battery until a portion of the battery
is out of the plastic holder.
3. With your free hand gently move the battery out of the holder while keeping the battery
pried up.
4. Dispose of the old battery according to local requirements.
5. Insert the new battery into holder.
IMPORTANT: The lithium battery is polarized. Ensure the side marked ‘+’ faces out or towards you.
Impaired Performance Conditions
A list of conditions that may cause impaired performance is provided in the following table,
with reference pages.
Field Servicing
Troubleshoot the CK721-A by substituting the suspected defective panel with a new
component.
All replaceable parts are available from Johnson Controls.
Consult your Customer Success Center representative at (800) 482-2778 for domestic orders or
for instructions on how to obtain replaceable parts.
Table 8: Impaired Performance Conditions
Condition Information Location
Unit environment not as specified. Table 2 on page 2
Unit power and grounding not as specified. Power Wiring on page 7
Cable length or type not as specified. Table 5 on page 6
Backup battery not replaced correctly. This section (Maintenance).
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