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AEC A0551794 RS Series Manual
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Screw Compressor Central Chiller Chapter 3: Installation 19Making Tank Piping ConnectionsIf you have purchased the Screw Compressor central chilling station with the optionalintegral pump tank, please proceed with this section.Note: Thermocouplings for chillers must be installed on both the hot and coldsides of the tank.Freezestat ControlThe unit can be equipped with a freezestat control which shuts down the compressor if thechilled water temperature approaches the freezing point. The chilled water pump on thesystem will continue to run. It is factory-set at 40°F (4ºC) or 10°F (6ºC) below the ratedcapacity operating temperature of 50°F (10ºC).If you want lower chilled water temperatures (minimum of 30°F (-1ºC), you’ll need to mixprocess water with industrial- (not automotive) grade ethylene or propylene glycol with rustinhibitor to provide protection down to 20°F (12ºC) below the operating temperature youwant. Figure 1 below shows the proper mixtures needed to provide protection to 20°F (12ºC)below the operating temperature you want. You can then reset the freezestat cutouttemperature to a temperature 10°F (6ºC) below the operating temperature you selected.Caution! Make sure all freezestat adjustments are performed by a qualifiedrefrigeration service technician.The manufacturers product warranty does not cover system freeze-up!Figure 1: Freezing Protection CurveExample: Desired leaving temperature = 35°F (1.7ºC),Glycol % by volume = 35%This will provide protection to 15°F (-9.4ºC)Ethylene glycol required for evaporator freeze protectionEthyleneglycolpercent byvolumeChilled water operating temperature ºF / ºC6050403020100-50ºF -40ºF-40ºC-30ºF -20ºF -10ºF 0ºF 10ºF 20ºF 30ºF 40ºF 50ºF 60ºF16ºC10ºC4ºC-1ºC-7ºC-12ºC-18ºC-23ºC-29ºC-34ºC-46ºC |
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