Johnson Controls CK721-A User Manual

24-10349-8 Rev. B 5-1
Chapter
5
This document contains confidential and proprietary information of Johnson Controls, Inc.
© 2012 Johnson Controls, Inc.
MAINTENANCE
This chapter provides maintenance instructions, operational testing procedures,
troubleshooting guidelines, and instructions on how to obtain replaceable parts for the
CK721-A system.
ROUTINE MAINTENANCE
 Perform the following routine maintenance on the CK721-A:
1. Periodically check the continuity of the grou
nding circuit.
2. Perform operational testing mo
nthly (see “Testing Procedure” on page 5-2).
3. Replace the lithium battery every five
years or after extended (five days)
power interruption (Panasonic CR 2025 or equivalent).
4. If installed, replace the lead-acid backup batteries every three years (either
Power
Sonic PS-1270, 12 VDC, 7 Ah or equivalent; or Power Sonic PS-1228,
12 VDC, 2.8 Ah or equivalent.)
IMPAIRED PERFORMANCE CONDITIONS
A list of conditions that may cause impaired performance is provided in Table 5-1, with
reference pages.
Table 5-1: Impaired Performance Conditions
Condition Information Location
Unit environment not as specified. Table 1-5.
Unit power and grounding not as
spec
ified.
Page 2-17, Table 3-2, and Appendix C.
Cable length or type not as specified. Page 2-11, Table 3-1, and Figure 3-19.
Backup battery not replaced correctly. This chapter.

Johnson Controls CK721-A Specifications

General

Brand	Johnson Controls
Model	CK721-A
Category	Controller
Language	English