US Army, Technical Manual, TM 5-4120-384-14, AIR CONDITIONER, HORIZONTAL COMPACT; 18,000 BTU/HR, 208 V, 3 PHASE, 50/60 HZ, MODEL F18H-3S, (NSN 4120-01-165-1125), MDL F18H-3SA (4120-01-237-4663), MDL F1, (4120-01-268-4451), AND 230V, SINGLE PHASE, 60HZ, MDL F18H-1S, (4120-01-268-4450), military manuals