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Appendix A – Major Monitoring and Maintenance Events This appendix provides a table (Table 3) outlining the timeline for major monitoring and maintenance events, and their resolution, at the field site. 1 3 2019 5 2019 7 Feb Mar 20 Tree branch fell on inoperable HPWH3 HPWH1 entered idle status Storm damage Error code indicated possible control board issues† Eventual flow meter replacement in March 2019 New HPWH ordered to replace damaged equipment Issue detected and building maintenance alerted Issue detected and building maintenance alerted. Because of second failure for this unit, factory recommended control board replacement. Part was ordered. Table 3. Major Measurement and Verification Events Event Year Month M&V Observation Event Cause Resolution 2 2018 2019 Dec Jan 2019 Ongoing M&V Equipment trouble shooting; active energy monitoring HPWH3* entered idle status (this had happened several times previously) A faulty flow meter was identified and scheduled for replacement Error code indicated possible control board issues† 4 2019 Mar 7 Faulty flow meter and damaged Sanden replaced See Events 1 and 3 above Resolution to Events 1 and 3 above 6 2019 Apr 11 HPWH1 operable again See Event 5 Building maintenance staff power cycled the equipment so it resumed operation – resolution to Event 5 2019 Apr 22 Error code indicated possible control board issues† 8 2019 May 1 HPWH1 entered idle status Energy monitoring data outage Remote connection to data communication protocols interrupted. Resolved connection issues, and data began logging again within 5 days BONNEVILLE POWER ADMINISTRATION 25PDF Image | CO2 Heat Pump Water Heater Multifamily Retrofit
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