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January. The storm-damaged unit was replaced in March 2019. Several weeks later the team reviewed the M&V online portal and detected a different unit (HPWH1) in idle status. Initially, the error code was believed to indicate a faulty control board; the manufacturer suggested replacing it. Later, it was determined that the error code was misinterpreted based on error codes from a prior generation model. The error codes received to date were eventually attributed to a low-flow/high entering-water temperature warning. With this new information, action was taken to resolve idle HPWH1 in July. In late May, a water leak was detected at the site. This was addressed in June, and the repair required shutting off the water. As the water was turned back on, a single valve was overlooked, causing water to flow backward through the system. This registered as extremely high flow rates visible via the M&V portal. In mid-June, the valve issue was addressed, but there were still only three operational HPWHs. In mid-July, with new information on the error codes, the team discovered that HPWH1 was shutting off to avoid operating at high temperatures. The incoming water filter (strainer) was clogged, leading to the high- water temperature warning. Once the strainer was cleaned, and the unit power cycled, HPWH1 resumed proper function. After mid-July, there were few equipment issues until September 2019, when the same unit (HPWH1) again experienced idle periods. A service visit identified a clogged strainer and the same strainer cleaning and cycling of power procedure brought the HPWH back online. In September, the mechanical contractor instructed the facilities staff in this process. Additional idle events were detected between November 2019 and February 2020. The error code was not always recorded by building maintenance staff, but rinsing the filters and power cycling the units returned the idle unit to operations. In late January – early February 2020 two of the HPWHs became idle. The error on both units indicated the condenser fan revolution had initiated the alarm. In March, the error history on HPWH1 revealed that the November through February events were also due to the condenser fan revolution error. Appendix A provides a summary of the events at this site to date. The January/February event also suggested that the electric boiler backup system was not fully operational because the temperature of the water delivered to the recirculation loop fell below the backup system set point. Maintenance staff conducted an onsite investigation to verify backup system operation settings. In March, staff determined that the set-point for the back-up boiler operation was changed to a higher M&V site data was critical to detect and troubleshoot HPWHs; facilitated communications with stakeholders and maintenance staff; and ensured that the system operated as designed. BONNEVILLE POWER ADMINISTRATION 11PDF Image | CO2 Heat Pump Water Heater Multifamily Retrofit
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