Note: *C33-18A through C33-62C coils are positioned on the furnace cabinet front-to-rear, as shown, C33-60D and C33. 1. Crankcase heater, manual reset high-pressure switch, auto reset low-pressure switch TSA*H4 Optional Features: 1. Compressor sound cover 2. Hail guard 3. Low ambient cut-out switch to prevent compressor operation below 35°F 4.