Carrier AquaForce PUREtec 30XW-VZE 451 Installation, Operation And Maintenance Instructions

176 - APPLICATION DATA6.1 - 30XW-VZE /30XWHVZE Operating limits30XW-V/30XWHV Minimum MaximumEvaporatorEntering temperature at start-up - 35,0°CLeaving temperature during operation 3,3°C(1) 20,0°CEntering/leaving temperature difference at fullload 2,8 K 11,1 KCondenserEntering temperature at start-up 13,0°C (2) -Leaving temperature during operation 19,0°C(2) 55,0°CEntering/leaving temperature difference at fullload 2,8 K 11,1 K(1) For low-temperature applications, where the leaving water temperature is below3.3°C, a frost protection solution must be used. Please refer to option 8(2) 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.152025303540455055600 5 10 15 20Condenser leaving water temperature, °CEvaporator leaving water temperature, °CFrom approx. 60% to full loadPart load limit approx. 50%Minimum load limit 20%Note: Ambient temperatures: These units are dedicated forindoor environment. The external temperature at chiller startup should be at least 5°C. For such low ambient, option 152is recommended. During storage and transport of the 30XW-VZE/30XWHVZE units (including by container) the minimumand maximum permissible temperatures are -20°C and 70°C.6.2 - Condenser-side installationrecommendationTo ensure unit start-up at low condenser water temperatureconditions, a specific installation may be necessary. Please referto the table below:0 < t <20min20 < t <40min40 < t <60min t > 60min15°C < x13 < x < 15°C11 < x < 13°C8 < x < 11°Cx < 8°C1 23 4x Condenser water temperature before start-upt Time required to reach a temperature of 19°C at the condenser outlet1 “The unit can start without the use of a two- or three-way valve, but operationwill be more reliable with the control valve.”2 “The use of a two- or three-way valve is strongly recommended.”3 “The use of a two- or three-way valve is compulsory.”4 The use of a two- or three-way valve is compulsory and the use of variablespeed pumps is strongly recommended.6.3 - Minimum chilled water flowThe minimum chilled water flow is shown in the table in chapter7.7.If the system flow is less than the minimum unit flow rate, theevaporator flow can be recirculated, as shown in the diagram.For munimum chiller flow rate12Legend1 Evaporator2 Recirculation6.4 - Maximum chilled water flowThe maximum chilled water flow is limited by the permittedpressure drop in the evaporator. It is provided in the table in chapter7.7.- Select the option with one water pass less that will allow ahigher maximum water flow rate (see option 100C in the tablein chapter 6.6 “Number of passes”.- Bypass the evaporator as shown in the diagram to obtain alower evaporator flow rate.For maximum chiller flow rate12Legend1 Evaporator2 Bypass6.5 - Condenser water flow rateThe minimum and maximum condenser water flow rates are shownin the table in chapter 7.7 “Evaporator and condenser water flowrates”.If the system flow is higher than the maximum unit flow rate, selectthe option with one pass less that will allow a higher maximumwater flow rate. Please refer to option 102C in the table in chapter7.6 “Number of passes”.