What performance inputs (e.g., capacity, COP) should be used for the low speed of a two-speed heat pump when cooling? The rating conditions specified in the I/O reference state 26.7 C dry-bulb/19.4 C wet-bulb indoor and 35 C dry-bulb/23.9 C wet-bulb for each speed. However, AHRI standard 210/240 only has a test at these conditions for the high speed (the A_2 test). The AHRI low speed test conditions are the same for the indoor but are either 27.8 C/18.3 C (test B_1) or 19.4 C/11.9 C (test F_1) for the outdoor. Note that there is a test B_2 for the high speed at the same conditions as B_1.
So, it seems my options are either to comply with the E+ specifications for the high speed and use results from the B_1 test for the low speed, or ignore the E+ specifications and stay consistent between the two tests and use results from B_2 and B_1. Thoughts?
