Data Aire DAMA-01 Installation, Operation And Maintenance Manual

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Data Aire DAMA-01 Installation, Operation And Maintenance Manual Manual pdf 26 page image

26NOTE: Charging to a full liquid line sight-glass should never be the sole means of de-termining the correct refrigerant charge. Other parameters such as superheat, suctionpressure, head pressure, sub-cooling and ambient temperature are also important. Asystem charged to a clear sight-glass is often overcharged.5.3 Water/Glycol Cooled Systems5.3.1 Water/Glycol Cooled System ChargingAll water/glycol cooled units are factory charged with refrigerant. The water regulating valve shouldbe adjusted to maintain a condensing temperature of 105 to 119°F. Saturated suction temperatureshould be 33°F or higher. The superheat at the compressor suction line (measured at least 6 inchesaway from the compressor) should be 8 to 15°F.Field charging water/glycol systems (if required) should be done by referring to the unit’s electricalnameplate. The factory charge is indicated on the nameplate. Although this value represents theoriginal factory charge, it is still necessary to measure and note proper unit operation including su-perheat, head and suction pressure. Some adjustment to the refrigerant may be required.Adjust the refrigerant charge until the sight-glass clears or has sparse bubbles. The unit shouldbe allowed to stabilize for several minutes before meaningful measurements can be taken and theconditioned space should be at or near the temperature setpoint.All water/glycol cooled units have a water regulating valve. A head pressure sensing transducer isconnected to a shrader fitting on the discharge line and water is regulated into the condenser coil.Standard condensers are plate fin type.WARNING: Before starting a compressor, the crankcase heater should be energizedfor a minimum of 12 hours to reduce the possibility of liquid slugging on start-up. Fail-ure to energize the crankcase heater could result in compressor damage. If the systemis charged from a vacuum, the pre-heating of the compressor is not necessary.NOTE: Charging to a full liquid line sight-glass should never be the sole means of de-termining the correct refrigerant charge. Other parameters such as superheat, suctionpressure, head pressure, sub-cooling and ambient temperature are also important. Asystem charged to a clear sight-glass is often overcharged.5.3.2 Factory Charge for Water/Glycol Cooled SystemsEvaporator Model R-407C R-410ADAMW/G 01 Consult Factory Consult FactoryDAMW/G 1.5 Consult Factory Consult FactoryDAMW/G 02 Consult Factory Consult FactoryDAMW/G 2.5 Consult Factory Consult Factory