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NC-2009 EAc4:Enhanced Refrigerant Management

N, Qunit (tons) and Refrigerant Charge (Rc) in lb/ton

Dear All, I'm trying to fill the EAc4 form, but I don't understand about HVAC&R at all. I'm not too sure what is N, Q and Rc column meaning. Please correct me if I'm wrong. N = number of outdoor HVAC unit Q = the weigh of the outdoor HVAC unit Rc = the weigh of refrigerant inside the piping system. Are those correct? In addition, I also found difficulties in filling the Rc column. In the form, Rc unit is in lb/ton, but as I look into the manufacturers data, the Rc is provided in kg. How can I deal with this? Please help, because our HVAC engineers are also not familiar with refrigerant impact calculation.

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Art Irwin
CBCP, LEED AP
Alfa Tech Consulting Engineers
LEEDuser Basic Member
12 thumbs up

Wed, 02/05/2014 - 00:27

N is the number of units matching that description Q is the capacity of each unit in "tons" (1 ton = 12,000 btu/hr) Rc is the weight per ton of the refrigerant. You may need to convert from kg to lb and from kW to tons. To calculate the Rc, you can divide the total refrigerant charge weight by the unit capacity. For example, a 25 ton AC unit with 23 lb of R-410A will have an Rc of 0.92 lb/ton.

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