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Hersteller: Carrier Dateigröße: 1.45 mb Dateiname: 30h-10si.pdf Unterrichtssprache:

Shell-and-Tube Condenser Cleaning — The shelland- tube condenser tubes can be cleaned either mechanically or chemically. To clean them chemically, follow the procedure described in Brazed-Plate Cooler and Condenser Heat Exchanger Cleaning section above. To clean the condenser tubes manually: 1. Order tubing brushes (Carrier part no. KC21AH105). 2. Close the valves on the condenser and relieve condenser water pressure. BE SURE TO PROVIDE DRAINAGE TO PREVENT WATER DAMAGE. 3. Remove the condenser heads and brush the tubes clean, removing scale and other deposits. 4. Inspect the head gaskets and replace if necessary. 5. Clean all gasket surfaces prior to reassembly. 6. Replace the water heads and torque the head bolts to 90 ft-lb (122 N-m). Allow the gaskets to set overnight and re-torque the bolts to ensure proper sealing. 32 Thermistor — The resistance at various temperatures for the thermistor are given in Tables 12A and 12B. THERMISTOR REPLACEMENT, 30HK, HL UNITS Thermistors are installed directly in fluid circuit. Drain fluid before removing. Proceed as follows (see Fig. 22): 1. Remove and discard original thermistor and coupling. IMPORTANT: Do not diassemble new coupling. Install as received. 2. Apply pipe sealant to 1.4-in. NPT threads on replacement coupling and install in place of original. Do not use a packing nut to tighten coupling. This damages the ferrules (see Fig. 22). 3. Insert thermistor T1 into coupling body to its full depth. Tighten packing nut finger tight to position ferrules, then tighten 11.4 turns more using a back-up wrench. Ferrules are not attached to the sensor, which can be withdrawn from coupling for service. THERMISTOR REPLACEMENT, 30HW UNITS — To replace the thermistor, follow these steps: 1. Disconnect the existing thermistor from the S1 and S2 terminals of the temperature controller (located in the control section of the control box). 2. Remove the thermistor from the well in the cooler leaving- fluid cacity. 3. Insert the replacement thermistor into the thermistor well. 4. Run thermistor wires into the control box and connect to the S1 and S2 terminals of the temperature controller. Fig. 22 — Thermistor 33 Table 12A — Sensor Temperature (F) vs Resistance TEMPERATURE RESISTANCE TEMPERATURE RESISTANCE TEMPERATURE RESISTANCE (F) (OHMS) (F) (OHMS) (F) (OHMS) -25 98,010 63 7,091 151 1,007 -24 94,707 64 6,911 152 986 -23 91,522 65 6,735 153 965 -22 88,449 66 6,564 154 945 -21 85,485 67 6,399 155 925 -20 82,627 68 6,237 156 906 -19 79,871 69 6,081 157 887 -18 77,212 70 5,929 158 868 -17 74,648 71 5,781 159 850 -16 72,175 72 5,637 160 832 -15 69,790 73 5,497 161 815 -14 67,490 74 5,361 162 798 -13 65,272 75 5,229 163 782 -12 63,133 76 5,101 164 765 -11 61,070 77 4,976 165 749 -10 59,081 78 4,855 166 734 -9 57,162 79 4,737 167 719 -8 55,311 80 4,622 168 705 -7 53,526 81 4,511 169 690 -6 51,804 82 4,403 170 677 -5 50,143 83 4,298 171 663 -4 48,541 84 4,195 172 650 -3 46,996 85 4,096 173 638 -2 45,505 86 4,000 174 626 -1 44,066 87 3,906 175 614 0 42,678 88 3,814 176 602 1 41,339 89 3,726 177 591 2 40,047 90 3,640 178 581 3 38,800 91 3,556 179 570 4 37,596 92 3,474 180 560 5 36,435 93 3,395 181 551 6 35,313 94 3,318 182 542 7 34,231 95 3,243 183 533 8 33,185 96 3,170 184 524 9 32,176 97 3,099 185 516 10 31,201 98 3,031 186 508 11 30,260 99 2,964 187 501 12 29,351 100 2,898 188 494 13 28,472 101 2,835 189 487 14 27,624 102 2,773 190 480 15 26,804 103 2,713 191 473 16 26,011 104 2,655 192 467 17 25,245 105 2,598 193 461 18 24,505 106 2,542 194 456 19 23,789 107 2,488 195 450 20 23,096 108 2,436 196 444 21 22,427 109 2,385 197 439 22 21,779 110 2,335 198 434 23 21,153 111 2,286 199 429 24 20,547 112 2,238 200 424 25 19,960 113 2,192 201 419 26 19,392 114 2,147 202 415 27 18,843 115 2,103 203 410 28 18,311 116 2,060 204 405 29 17,796 117 2,018 205 401 30 17,297 118 1,977 206 396 31 16,814 119 1,937 207 391 32 16,346 120 1,898 208 386 33 15,892 121 1,860 209 382 34 15,453 122 1,822 210 377 35 15,027 123 1,786 211 372 36 14,614 124 1,750 212 366 37 14,214 125 1,715 213 361 38 13,826 126 1,680 214 356 39 13,449 127 1,647 215 350 40 13,084 128 1,614 216 344 41 12,730 129 1,582 217 338 42 12,387 130 1,550 218 332 43 12,053 131 1,519 219 325 44 11,730 132 1,489 220 318 45 11,416 133 1,459 221 311 46 11,111 134 1,430 222 304 47 10,816 135 1,401 223 297 48 10,529 136 1,373 224 289 49 10,250 137 1,345 225 282 50 9,979 138 1,318 51 9,717 139 1,291 52 9,461 140 1,265 53 9,213 141 1,239 54 8,973 142 1,214 55 8,739 143 1,189 56 8,511 144 1,165 57 8,291 145 1,141 58 8,076 146 1,118 59 7,868 147 1,095 60 7,665 148 1,072 61 7,468 149 1,050 62 7,277 150 1,028 34 Table 12B — Sensor Temperature (C) vs Resistance TEMPERATURE RESISTANCE TEMPERATURE RESISTANCE TEMPERATURE RESISTANCE (C) (OHMS) (C) (OHMS) (C) (OHMS) -32.0 100 049 16.0 7507 64.0 1090 -31.5 97 006 16.5 7334 64.5 1070 -31.0 94 061 17.0 7165 65.0 1050 -30.5 91 209 17.5 7000 65.5 1030 -30.0 88 449 18.0 6840 66.0 1011 -29.5 85 777 18.5 6683 66.5 992 -2...

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