This post references a previous blog post from March 2011, where I outlined the max refrigerant quantities allowed in a VRF system to meet CAN/CSA B52-2005. There has been a recent update to this standard, which increases the refrigerant quantity allowance. The following chart reflects the most recent update from CSA:
Occupancy Classification | MAX Refrigerant Charge (lbs/1,000-ft3) |
Institutional | 12.5 |
Publiy Assy/Residential | 25 |
Commercial | 25 |
Industrial | 25 |