Carrier Aquazone 50RHE 006 Installation, Operation And Maintenance Instructions

Contents

22Table 9 - Typical unit operating pressures and temperaturesEntering Water Cooling Heatingwater flow Suction Discharge Super- Sub- Water temp. Air temp. Suction Discharge Super- Sub- Water temp. Air temp.temp. l/s per kW pressure pressure heat cooling rise drop pressure pressure heat cooling drop rise°C kPa kPa K K K K kPa kPa K K K K-1 0.027 225-254 269-314 14-22 7-11 12-13 12-14 102-117 499-556 7- 9 1-2 4-5 8-110.041 222-251 239-284 14-22 6-10 7- 9 12-14 111-129 514-571 7- 9 1-2 3-4 9-120.054 219-248 209-254 14-22 6- 9 3- 6 12-14 120-138 529-586 7- 9 1-2 2-3 9-1210 0.027 225-254 374-463 7-11 6-10 11-13 11-14 150-179 538-628 6- 9 1-3 6-7 13-160.041 222-251 359-425 7-11 5- 9 7- 8 11-14 158-185 553-643 6- 9 1-3 4-5 13-170.054 219-248 344-413 7-11 4- 8 4- 7 11-14 164-194 568-658 6- 9 1-3 3-4 14-1721 0.027 225-254 535-592 5- 9 4- 8 11-12 11-13 212-245 613-688 8-11 1-3 8-9 16-190.041 222-251 502-556 5- 9 4- 7 7- 9 11-13 218-254 628-712 8-11 1-3 5-6 17-210.054 219-248 472-523 5- 9 4- 7 4- 7 11-13 227-263 643-724 8-11 1-3 3-4 17-2132 0.027 225-254 685-750 5- 9 4- 8 10-12 9-13 254-284 658-777 10-16 1-3 8-9 18-220.041 222-251 652-721 5- 9 4- 7 6- 8 9-13 269-299 673-792 10-16 1-3 6-7 18-230.054 219-248 622-688 5- 9 4- 7 3- 6 9-13 284-314 688-807 10-16 1-3 4-5 19-2343 0.027 231-260 837-957 4- 8 6-14 9-11 8-110.041 228-257 807-927 4- 8 6-13 5- 7 8-110.054 225-254 777-897 4- 8 6-12 3- 6 8-11Notes:1. Based on nominal 54 l/s per kW air flow and 21°C entering air temperature heating and 26.7/19.4°C entering air temperature cooling.2. Cooling air and water numbers can vary greatly with changes in humidity.3. Subcooling is based upon the head pressure at compressor service port.Table 10 - 50RHE tube-in-tube water pressure drop50RHE Flow Pressure drop, kPal/s 0°C 10°C 20°C 30°C006 0.047 6.0 5.4 5.1 4.80.071 8.4 7.8 7.2 6.90.095 14.1 13.2 12.0 11.7009 0.071 8.1 7.5 6.9 6.60.107 12.0 11.1 10.5 9.90.139 23.9 22.4 20.9 20.0012 0.095 19.1 17.9 16.7 16.10.145 41.3 38.9 36.2 34.70.189 66.1 61.9 57.7 55.0015 0.114 16.7 15.5 14.7 14.10.164 32.6 30.5 28.7 27.20.221 55.9 52.3 48.7 46.3019 0.142 12.9 12.0 11.1 10.80.215 23.0 21.5 20.3 19.10.284 45.4 42.5 39.8 37.7024 0.189 13.8 12.6 11.7 11.40.284 28.7 26.9 25.1 23.90.379 47.8 44.9 41.9 39.8030 0.237 9.9 9.0 8.4 8.10.347 17.0 15.8 14.7 14.10.473 26.9 25.4 23.6 22.4036 0.284 7.8 7.2 6.9 6.60.426 15.0 13.8 12.9 12.30.568 23.9 22.4 20.9 20.0042 0.331 9.9 9.3 8.7 8.40.498 19.7 18.5 17.0 16.40.663 31.1 29.3 27.5 26.0048 0.379 14.1 13.2 12.3 11.70.568 26.9 25.4 23.6 22.40.757 44.0 41.0 38.3 36.5060 0.473 33.5 31.4 29.3 27.80.713 58.3 54.4 50.8 48.40.947 88.5 82.8 77.1 73.36.6 - FlushingOnce the piping is complete, units require final purging and loopcharging. A flush cart pump of at least 1.12 kW is needed toachieve adequate flow velocity in the loop to purge air and dirtparticles from the loop. Flush the loop in both directions with ahigh volume of water at a high velocity. Follow the steps belowto flush the loop properly:1. Verify power is off.2. Fill loop with water from hose through flush cart beforeusing flush cart pump to ensure an even fill. Do not allowthe water level in the flush cart tank to drop below the pumpinlet line to prevent air from filling the line.3. Maintain a fluid level in the tank above the return tee toavoid air entering back into the fluid.4. Shutting off the return valve that connects into the flushcart reservoir will allow 345 kPa surges to help purge airpockets. This maintains the pump at 345 kPa.5. To purge, keep the pump at 345 kPa until maximumpumping pressure is reached.6. Open the return valve to send a pressure surge through theloop to purge any air pockets in the piping system.7. A noticeable drop in fluid level will be seen in the flushcart tank. This is the only indication of air in the loop.NOTE: If air is purged from the system while using a 254 mmPVC flush tank, the level drop will only be 25 to 51 mm sinceliquids are incompressible. If the level drops more than this,flushing should continue since air is still being compressed inthe loop. If level is less than 25 to 51 mm, reverse the flow.8. Repeat this procedure until all air is purged.9. Restore power.Anti-freeze may be added before, during or after the flushingprocess. However, depending on when it is added in the process, itcan be wasted. Refer to the anti-freeze section for more detail.Loop static pressure will fluctuate with the seasons. Pressures willbe higher in the winter months than during the warmer months.This fluctuation is normal and should be considered whencharging the system initially. Run the unit in either heating orcooling for several minutes to condition the loop to a homogenoustemperature.When complete, perform a final flush and pressurise the loop toa static pressure of 275 to 345 kPa for winter months or 105 to135 kPa for summer months.After pressurisation, be sure to remove the plug from the end ofthe loop pump motor(s) to allow trapped air to be dischargedand to ensure the motor housing has been flooded. Be sure theloop flow centre provides adequate flow through the unit bychecking pressure drop across the heat exchanger. Compare theresults to the data in Table 10.