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188.8.131.52 Compressor Systems
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Refrigeration compressor systems shall conform to the following requirements:
- Compressors and multiple-compressor systems suction groups shall include control systems that use floating suction pressure control logic to reset the target suction pressure temperature based on the temperature requirements of the attached refrigeration display cases or walk-ins.
- Liquid subcooling shall be provided for all low-temperature compressor systems with a design cooling capacity equal to or greater than 100,000 Btu/h with a design saturated suction temperature equal to or less than —10°F. The subcooled liquid temperature shall be controlled at a maximum temperature set point of 50°F at the exit of the subcooler using either compressor economizer (interstage) ports or a separate compressor suction group operating at a saturated suction temperature equal to or greater than 18°F.
- Subcooled liquid lines are subject to the insulation requirements of Table 6.8.3-2.
- All compressors that incorporate internal or external crankcase heaters shall provide a means to cycle the heaters off during compressor operation.