This report presents details and results from a test on a pressurized fluidized-bed combustor which was concerned with: demonstrating that load can be changed at a suitable rate in a PFBC by changing the bed height and thus altering the ratio of cooled surface between the bed and the freeboard; and operating at 1400/sup 0/F bed temperature and a bed depth of 6 ft, with and without cooling in the freeboard at a fluidizing velocity, excess air and pressure of 4 ft/s, 50% and 75 psig, respectively. Most of the test was concerned with transferring bed material to-and-from a storage vessel at controlled but varying rates and at different bed temperatures. Bed levels were changed at rates of between 0.2 and 0.5 ft/min with no untoward excursions in gas composition. The most stringent conditions existed when changing bed temperature and pressure at the same time as changing bed level. It was concluded that changing load in this manner in a commercial unit would be a practical possibility. While changing bed height, heat transfer coefficients to cooled tubes in the splash zone were measured. The combustion efficiency was 97% without freeboard cooling, and 96% with freeboard cooling. Sulphur retention was about 71% at a Ca/S ratio of 1.4. NO/sub x/ emission was about 0.35 lb/10/sup 6/ Btu. Elutriation from the combustor was about 19,000 ppM of dust, considerably higher that in a previous test, because the dolomite contained many more fines than in Test 1. Response rate measurements were made. Other data given in the report deal with alkali emissions and the performance of the gas cleaning equipment.