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Event Year Month M&V Observation Event Cause Resolution 20 2019 2019 Dec 20 Dec 27-28 Jan 23 2020 No issue Building maintenance staff performed preventative cleaning on all HPWH strainers. 22 2020 HPWH3§ entered idle status HPWH1 entered idle status Unknown – possible tank stratification keeping the aquastat above the temperature which would have engaged the HPWH See Event 24 Issue detected and building maintenance alerted 21 23 2020 25 HPWH resumed normal operation on 12/29. No action was taken. Feb 6 HPWH2 entered idle status See Event 24 24 2020 Feb 8 HPWHs operable Error code on both units (E071) indicated condenser fan motor revolution error. Upon re-start contractor observed normal fan operation. Mechanical contractor serviced the idle units. Resolution to Events (22 & 23) 2020 Mar 18 Abnormal back-up system operation observed during February HPWH idle period. Possible cause identified as a set-point, adjusted since commissioning. Lowered final storage tanks set point back to 120°F threshold. *Numbering corresponds to eGauge labelling. † Initial error codes were mis-diagnosed and early equipment shut-offs were attributable to low-flow / high entering-water temperatures. ‡ HPWH1 error history was accessed 2020-03-18. Stored records indicated these errors were due to a condenser fan motor revolution error. §This is HPWH4 via the online web portal. BONNEVILLE POWER ADMINISTRATION 27PDF Image | CO2 Heat Pump Water Heater Multifamily Retrofit
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