Attributes . Temperature: Operating: 0° C to 49° C (32° F to 120° F). Storage: - 20° C to 70° C ( - 4° F to 158° F). Relative Humidity 85% +/- 5%. BTU/Hr (approx.): 24VAC: 344 BTU/Hr. 28VAC: 358 BTU/Hr. System AC input VA requirement: 310.5VA. . Names