Carrier 58MTB Installation, Start-up, And Operating Instructions Manual

Also see for 58MTB: User's information manual Owner's manual Service and maintenance instructions

SET TEMPERATURE RISEUNIT DAMAGE HAZARDFailure to follow this caution may result in overheating theheat exchangers or condensing flue gases in heat exchangerareas not designed for condensate.Temperature rise must be within limits specified on furnacerating plate. Recommended operation is at midpoint of riserange or slightly above.Place SW-1 in ON position. Jumper R to W/W1 and W2 to checkhigh-gas-heat temperature rise. To check low-gas-heat temperaturerise, remove jumper to W2. Determine air temperature rise for bothhigh and low gas heat. Do not exceed temperature rise rangesspecified on unit rating plate for high and low gas heat.This furnace must operate within the temperature rise rangesspecified on the furnace rating plate. Determine the air temperatureas follows:a. Place duct thermometers in return and supply ducts as closeto furnace as possible. Be sure thermometers do not ’see’heat exchangers so that radiant heat does not affect ther-mometer readings. This is particularly important withstraight run ducts.b. When thermometer readings stabilize, subtract return-airtemperature from supply-air temperature to determine tem-perature rise.If the temperature rise is outside this range, check the following:a. Gas input for low- and high gas heat operation.b. Derate for altitude if applicable.c. Return and supply ducts for excessive restrictions causingstatic pressures greater than 0.50-in. wc.d. Adjust temperature rise by adjusting blower speed. In-crease blower speed to reduce temperature rise. Decreaseblower speed to increase temperature rise.ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injuryor death.Disconnect 115-v electrical power before changing speed tap.For high-heat, the following connections can be made at HI HEATon control:a. Med-high (Yellow)b. Med (Orange) -Available only on 5-speed motors. Factorysetting for these motors.c. Med-Low (Blue) - Do NOT use for HI GAS-HEAT on80K & 120K Btuh input models. Factory setting for4-speed motors.UNIT DAMAGE HAZARDFailure to follow this caution may result in damage to the heatexchangers due to over temperature or condensate corrosion.1. NEVER connect Low Speed (Red) wire to ″HI HEAT″.2. Do NOT connect Medium Low Speed (Blue) wire to ″HI-HEAT″ on 80,000 Btuh and 120,000 Btuh input modelsizes.Table 15—Altitude Derate Multiplier for U.S.A.ALTITUDE(FT)PERCENTOF DERATEDERATE MULTIPLIERFACTOR FOR U.S.A.*0–2000 0 1.002001–3000 4–6 0.953001–4000 6–8 0.934001–5000 8–10 0.915001–6000 10–12 0.896001–7000 12–14 0.877001–8000 14–16 0.858001–9000 16–18 0.839001–10,000 18–20 0.81* Derate multiplier factor is based on midpoint altitude for altitude range.Table 16—Gas Rate (CU FT/HR)SECONDSFOR 1REVOLUTIONSIZE OF TEST DIAL SECONDSFOR 1REVOLUTIONSIZE OF TEST DIAL1Cu Ft2Cu Ft5Cu Ft1Cu Ft2Cu Ft5Cu Ft10 360 720 1800 50 72 144 36011 327 655 1636 51 71 141 35512 300 600 1500 52 69 138 34613 277 555 1385 53 68 136 34014 257 514 1286 54 67 133 33315 240 480 1200 55 65 131 32716 225 450 1125 56 64 129 32117 212 424 1059 57 63 126 31618 200 400 1000 58 62 124 31019 189 379 947 59 61 122 30520 180 360 900 60 60 120 30021 171 343 857 62 58 116 29022 164 327 818 64 56 112 28123 157 313 783 66 54 109 27324 150 300 750 68 53 106 26525 144 288 720 70 51 103 25726 138 277 692 72 50 100 25027 133 267 667 74 48 97 24328 129 257 643 76 47 95 23729 124 248 621 78 46 92 23130 120 240 600 80 45 90 22531 116 232 581 82 44 88 22032 113 225 563 84 43 86 21433 109 218 545 86 42 84 20934 106 212 529 88 41 82 20535 103 206 514 90 40 80 20036 100 200 500 92 39 78 19637 97 195 486 94 38 76 19238 95 189 474 96 38 75 18839 92 185 462 98 37 74 18440 90 180 450 100 36 72 18041 88 176 439 102 35 71 17842 86 172 429 104 35 69 17343 84 167 419 106 34 68 17044 82 164 409 108 33 67 16745 80 160 400 110 33 65 16446 78 157 391 112 32 64 16147 76 153 383 116 31 62 15548 75 150 375 120 30 60 15049 73 147 367 124 29 58 14556