Honeywell CIU 888 - CHAPTER 4 Maintenance; Hardware; Cooling

Maintenance
Part No.: 4417594_Rev11 Troubleshooting & Maintenance Guide
CIU 888 4 - 1
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CHAPTER 4 MAINTENANCE
4.1 Hardware
4.1.1 Cooling
To prevent the CIU 888 from overheating, it is recommended to clean
the heat sinks of the CIU 888 regularly to ensure a good air flow.
4.1.2 Lithium battery
The lithium battery built into the CIU 888 is used for powering the real-
time clock during power-off situations. The battery life is approximately
10 years.
FIGURE 4-1 CIU 888: Lithium battery