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4. Cycle power and reattempt communication with the compressor.
4.27.3 BMCC Battery and Verification
All BMCC printed circuit boards (PCBs) include a real-time clock integrated circuit (RTC-IC) for the purpose of
maintaining the time and date of compressor events. While power is applied to the compressor, the BMCC receives
a 5V supply via the Backplane to power the RTC-IC. The battery becomes the RTC-IC power supply and maintains the
date and time only in the event of a power loss, if the BMCC is installed on a compressor that is not powered on, or if
the BMCC was never installed on a compressor at all.
The Backup Battery does not affect the operation of the compressor in any way, nor does it have any adverse effects
on the software within the BMCC. In fact, the only way to know if the battery may be defective is to verify the correct
time was kept after the BMCC lost its 5V supply for any reason.
4.27.3.1 BMCC Battery Safety
The battery used in the BMCC is a coin type lithium style. The part number is BR1225. This battery is not sold by
Danfoss LLC but can be locally sourced at most stores that sell coin-type batteries.
• • • DANGER! • • •
Please follow the safety warnings listed in this section.
Please observe the following safety warnings:
l
Verify the battery is properly installed (“+” side facing up, away from the PCB)
l
Do not attempt to charge the battery
l
Do not deform, short, or heat up the battery
l
Keep the battery away from small children and pets. A physician should be contacted immediately
if the battery is swallowed
l
Wrap insulating tape, such as electrical tape, around the battery prior to disposal
l
Always refer to local requirements in your area to ensure the battery is properly disposed
4.27.3.2 BMCC Battery Verification
To verify the integrity of the battery, the BMCC case must be separated.
• • • CAUTION • • •
The BMCC is sensitive to ESD, which can render the BMCC software useless. When attempting to verify the condition of the backup battery,
refer to Section 1.9 Handling Static Sensitive Devices on page 24 in this manual.
NOTE
This should only be performed when warranty has expired.
1. Remove the BMCC. Refer to Section 4.27.4.1 BMCC Removal on page 222.
2. Separate the BMCC case by removing or cutting the stickers that are applied to the seam of the case
halves.
M-SV-001-EN Rev. H-1/23/2023 Page 221 of 294
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