Forum discussion
CS-v4 EAc6: Enhanced refrigerant management
We are using a heat pump type water heater. The refrigerant capacity for the unit is over the 0.5 lb threshold. Does anyone have any advice as to determine the nominal capacity of the heat pump portion of the water heater since that is what needs to be compared to the refrigerant charge?
Also I was planning on listing the equipment as a packaged heat pump. Does that seem appropriate?
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Melissa Kelly
Sustainability SpecialistGensler
85 thumbs up
June 2, 2016 - 6:43 pm
Hi Ammon,
I've not had experience including heating-only equipment in this credit and it'd be great to hear from anyone that has, since this has actually been puzzling me for a while! The credit language is written as if it applies to heating, cooling, ventilation, and refrigeration, but only cooling and refrigeration is ever addressed.
My thought is that the best approach, from the standpoint of the credit intent and the calculations, would be to use the nominal heating capacity of the equipment (found on the cutsheet or submittal), convert it to tons to keep the units correct in the calculation, and then include it in the table.
If it's serving water heating and not space heating, it may be better to list it as an "other" type of equipment with a ten-year lifespan. You can use a longer value for the lifespan if the manufacturer is able to provide backup documentation, such as a warranty period.