Carrier Aquaforce 30XA302 Installation, Operation And Maintenance Instructions

Also see for Aquaforce 30XA Series: Installation instructions Operation instructions User guide

Contents

419.5 - Operating limits for stable operation (no modechangeover)9.5.1 - Cooling only modePlease refer to the earlier chapters in this manual:6.1 - Unit operating range6.7 - Evaporator water flow rate9.5.2 - Heat reclaim modeCondenser water temperature°C Minimum MaximumWater entering temperature at start-up 12.5* 55Water entering temperature during operation 20 55Water leaving temperature during operation 25 60Evaporator water temperature°C Minimum MaximumWater entering temperature at start-up - 45Water entering temperature during operation 6.8 21Water leaving temperature during operation 3.3 15* The water entering temperature at start-up must not be lower than 12.5 °C. Forinstallations with a lower temperature a three-way valve must be used.NOTE: If the temperature at the evaporator is below 4 °C, a glycol/water solution orthe frost protection option must be used.In part-load operation, the limitation of the condenserleaving water temperature is due to the operating range ofthe screw compressor. If the condenser leaving watertemperature is above the limit value given in the curvesbelow, the unit will automatically change over to the modewithout heat recovery:9.3 - Condenser locationAll heat reclaim condensers are located between theair-cooled condensers on the upper part of the chassis,support-ed by two cross rails. The water inlet and outlet areon the same side.9.4 - Condenser water connections9.4.1 - Unit with one heat reclaim condenser (30XA 252-502)The water flow switch must be installed at the water inlet ofthe installation that arrives at the heat reclaim condenser.Legend1 Heat reclaim condenser2 Entering water temperature sensor (supplied)3 Leaving water temperature sensor (supplied)4 Condenser water flow switch (supplied)5 Three-way valve (not supplied)9.4.2 - Unit with two heat reclaim condensers (30XA 602-1002)The two condensers must be installed in parallel in the watersystem of the installation. The water flow switch and theentering/leaving water temperature sensors must beinstal-led in the line that is common to both heat reclaimcircuits and as close as possible to the condensers. AT-piece must be provided by the installer at the water inletand outlet of the condensers.For units with two condensers the maximum cable lengthof the temperature sensors and the flow switch (7.5 m) isdesigned to allow connection to the common inlet or outletin a radius of 4.5 m after routing along the width of the unit.LegendPlease refer to the legend in chapter 9.4.1 opposite, noting that items 2, 3 and 4 -flow switch and sensors - are placed on the common sections.9.4.3 - Three-way valvesIt is strongly recommended to install a three-way valve inthe system (not supplied with the unit). A 0-10 V output isavailable on the unit electronic board to control this valve.The valve allows bypassing of the heat reclaim condenserentering/leaving circuit to ensure unit operation with heatreclaim at low entering water temperature (< 12.5 °C). It alsoensures an optimal and controlled leaving water temperature.2 02 53 03 54 04 55 05 56 06 50 5 1 0 1 5Condenser leaving water temperature, °CEvaporator leaving water temperature, °CPart load operating limits (evaporator leaving watertemperature = 7 °C)404550556030405060708090100Maximum condenser leaving watertemperature, °CUnit load, %Full loadPart load limit, approx. 60%Minimum load limit, approx. 30%