Carrier 30XW Installation, Operation And Maintenance Instructions

Also see for 30XW: Operation instructions User guide Installation, operation and maintenance instructions

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Carrier 30XW Installation, Operation And Maintenance Instructions Manual pdf 18 page image

186.2 - Minimum chilled water flowThe minimum chilled water flow is shown in the table inchapter 6.6.If the system flow is less than the minimum unit flow rate,the evaporator flow can be recirculated, as shown in thediagram.For minimum chilled water flow rateLegend1. Evaporator2. Recirculation6.3 - Maximum chilled water flowThe maximum chilled water flow is limited by the permittedpressure drop in the evaporator. It is provided in the tablein chapter 6.6.• Select the option with one water pass less that willallow a higher maximum water flow rate (see option100C in the table in chapter 6.5).• Bypass the evaporator as shown in the diagram toobtain a lower evaporator flow rate.For maximum chilled water flow rateLegend1. Evaporator2. BypassEvaporator leaving water temperature, °CCondenser leaving water temperature, °C6.4 - Condenser water flow rateThe minimum and maximum condenser water flow ratesare shown in the table in chapter 6.6.If the system flow is higher than the maximum unit flowrate, select the option with one pass less that will allow ahigher maximum water flow rate. Please refer to option102C in the table in chapter 6.5.1520253035404550550 5 10 15 20From approx. 45% to full loadPart load limit approx. 35%Minimum load limit approx.15%5.7 - 24 and 230 V power reserve for the userControl circuit reserve:After all required options have been connected, the TCtransformer includes a power reserve that can be used forthe field control wiring:• Unit without option 084* 2 A (24 V a.c.) or 48 VA• Unit with option 084* 1.3 A (24 V a.c.) or 30 VA* 084 or 084R or 084DAs an option, a the 230 V, 50 Hz circuit allows the supply ofa battery charger for a portable computer at 1 A maximumat 230 V. The connection is via a CEE7/7 type socket (2poles with earth) located under the control box andaccessible from outside.6 - APPLICATION DATA6.1 - Operating limits for 30XW units30XW--/30XW-P Minimum MaximumEvaporatorEntering temperature at start-up - 35.0°CLeaving temperature during operation 3.3°C* 20.0°CEntering/leaving temperature difference at full load 2.8 K 11.1 KCondenserEntering temperature at start-up 13.0°C** -Leaving temperature during operation 19.0°C** 50.0°C***Entering/leaving temperature difference at full load 2.8 K 11.1 K* For low-temperature applications, where the leaving water temperature isbelow 3.3°C, a frost protection solution must be used. Please refer to option 5and option 6.** For lower condenser temperatures a water flow control valve must be used atthe condenser (two or three-way valve). Please refer to option 152 to ensurethe correct condensing temperature.*** Please refer to option 150 for applications with a high condenser leavingtemperature (up to 63°C).Note: Ambient temperatures: These units are dedicated for indoor environment.The external temperature at chiller start up should be at least 5°C. For such lowambient, option 152 is recommended. During storage and transport of the 30XWunits (including by container) the minimum and maximum permissible temperaturesare -20°C and 72°C (and 65°C for option 200).For more precise details refer to the unit selection program.12121