LENNOX Evaporator Coils Manual L0806277
User Manual: LENNOX LENNOX Evaporator Coils Manual LENNOX Evaporator Coils Owner's Manual, LENNOX Evaporator Coils installation guides
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INSTALLATION INSTRUCTIONS ® ,1,_2008 Lennox Dallas, Industries Inc, Texas, USA CR33 Series Coils EVAPORATOR 505,056M COILS _ Technical LL.L[ Publications 04108 Litho U.S.A. Supersedes 05/05 CR33 Series Coils ............................. General ..................................... Shipping and Packing List ...................... Dry Air Charge Release ........................ Plenum Installation ............................ Coil Installation ................................ Condensate Drain ............................. Blower Speed Adjustment ...................... RETAIN THESE INSTRUCTIONS REFERENCE 1 1 1 2 2 3 4 4 FOR FUTURE WARNING CAUTION IMPORTANT 04/08 IIIHIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII CR33 downflow evaporator coils are designed for use with condensing units or heat pumps. Each coil is equipped with a compression fitting that provides convenient field installation of a refrigerant metering device. Either a refrigerant metering orifice (provided with some Lennox condensing units) or a thermal expansion valve (ordered separately) may be used in condensing unit applications. A check / expansion valve (ordered separately) is the only metering device approved for use in heat pump applications. Refer to the Lennox Engineering Handbook for proper use of these coils with Lennox furnaces, condensing units, heat pumps and line sets. These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities who have jurisdiction before installation. Package 1 of 1 contains the following: 1 - CR33 evaporator coil 1 - Bag assembly containing: 3 - Straight coil Iocators (24B, 30/36B, 30/36C, 48C, 60D) 2 - Angular and 1 straight coil Iocator (18A, 24A, 30/36A, 48B, 50/60C) 6 - #8 Screws for fastening coil Iocators 1 - Liquid line stub (3/8" copper swedged) 1- O-ring 1 - Warranty/Installation Instructions Check equipment for shipping damage. If you find any damage, immediately contact the last carrier. Page 1 505,056M IIIIIIIIIIIIIIIIIIIIIIIIIIIIIII CAUTION The CR33 coils are shipped with a 10 psi dry air holding charge. Puncture the suction line rubber plug to release the charge. Remove the rubber plug. NOTE - If there is no pressure when the rubber plug is punctured, check the coil for leaks before installing the coil. 3. Sealing--Seal between the furnace cabinet and the coil cabinet to prevent air leaks. Loosen and remove the liquid line compression fitting. Remove and discard the plug which is in the distributor body. 4. As you lower the furnace onto the coil, align the flanges of the furnace and the the coil cabinet. Gas Furnace A IMPORTANT and Coil GAS FURNACE See table 1 for the dimensions of the floor opening required to accommodate the supply air opening and the plenum. If the unit is installed against a wall, the rear edge of the opening must be at least 1" (25 mm) from the wall. Cut an appropriately sized opening. Table Floor Opening CR33 Unit 1 to Side 19 (483mm) SEAL BETWEEN ADAPTER RAILS AND FURNACE. Front to Rear USE STRAIGHT OR i ANGULAR COIL LOCATOR BRACKETS, DEPENDING ON :_._ MODEL AND ! ALIGNMENT 23" (584mm) -_ CAUTION E--I,_=-]_2_1 _ REQUIREMENTS X I. Lower plenum through floor opening--Align the the base of the unit with the matching plenum, then lower the unit over the plenum. The coil cabinet must be level or sloped slightly toward the drain outlet and secured and sealed to the plenum, If the furnace and coil cabinet are the same size, skip to step 3. Figure ASTEN BRACKETS TO FURNACE AND COIL CABINET WITH #8 SCREWS 1 The refrigerant line sets should be sized according to the recommendations given in the condensing unit installation instructions (see table 2 for sweat connection sizes). A field-provided adapter may be required to match line set connections. Table 2 BJ_ [_J_Jl_I_ Refrigerant 2, Coil Cabinet Width--Install the provided coil Iocator brackets on the coil. Align the coil Iocator brackets with the rear and sides of the coil cabinet. Figure 1 illustrates how the furnace, coil, and coil Iocator brackets fit together. Page 2 04/08 ALIGN THE COIL LOCATOR BRACKET WITH THE REAR AND SIDES OF THE COIL CABINET. CR33 COIL 22-1/2" (571mm) -50/60C, -60D 505056M COIL LOCATOR BRACKETS 14-1/4" (394mm) - 18A, -24A, -24B, -30/36A, -30136B I_'_/i_ 0 Dimensions Side -30136C, -48B, -48C o Line Connection CR33 Model Suction (Vapor) Line Sweat Size -18, -24, -30/36 314(19.0) -48,-60 7/8 (22.0) Sizes - in (mm) Liquid Line Sweat Size 3/8(9.5) 3/8 Typical 1. Placea field-provided heatshield,suchasa wetrag, againstthepipingplateandaroundthepipingstubs, andsweatinthesuctionline.Theheatshieldmustbe inplacetoguardagainstheatdamagetothepaint. 2. Slidetheliquidlinecompression nutontotheprovided liquidlinestub.Insertthefield-supplied liquidlineinto theliquidlinestubforbrazing. 3. Brazeliquidlineand coilconnections. Usea silver alloybrazingrod(5or6 percentsilveralloyforcopperto-copperconnections or 45 percentsilveralloyfor copper-to-brass orcopper-to-steel connections). 4. Removetheheatshieldafterbrazingandallowthe connections tocool. 5. Selectthe appropriaterefrigerantmeteringdeviceRefrigerant Valve. Flow Control Metering Device Installation NYLON SEAT DISTRIBUTOR TUBES _ ORIFICE or ORIFICE HOUSING EXPANSION VALVE O-RING O-RING STRAINER _) LIQUID LINE STUB Orifice or Expansion SENSING BULB SUCTION LINE Figure 2 Install either a Refrigerant Flow Control Orifice or (Check/) Thermal Expansion Valve. Refer to outdoor unit bulletins for approved metering device. Refrigerant Flow Control Orifice To install the Refrigerant Flow Control Orifice: 1. Ensure that the orifice is installed with the nylon seat pointing toward the distributor (see figure 2). Check / Thermal Expansion Valve To install the Check/Thermal Expansion Valve: 1. Remove factory-installed metering orifice from orifice housing (see figure 2). 2. Apply a small amount of refrigerant oil on the O-ring (shipped with the valve assembly) and place it securely in the orifice housing. 2. Apply a small amount of refrigerant oil on the O-ring and insert the O-ring securely into the orifice housing. 3. Screw the liquid line stub to the orifice housing. Tighten the compression fitting to 20 ft-lbs. 4. The suction line service port has no core. Make sure that the service port cap is tightened securely. 5. Insulate the refrigerant lines at the connections to prevent sweating. NOTE - Slide Armaflex insulation up to cabinet to cover all of the suction line and seal cabinet opening. 3. Insert the expansion valve into the orifice housing and tighten the expansion valve compression fitting. 4. Screw the liquid line compression nut (with the liquid line) on the threaded end of the expansion valve. Tighten the fitting to 20 ft.qbs. 5. Install the expansion valve equalizer line on the suction line service port. NOTE - Make sure that the equalizer line fitting is tightened securely. 6. Use the clamp provided with the valve assembly to secure the sensing bulb to the suction line. Zi, IMPORTANT IMPORTANT Page 3 CR33 SERIES Before connecting drain line(s), check drain hole(s) to verify that drain opening is fully open and free of any debris. Also check to make sure that no debris has fallen into the drain pan during installation that may plug up the drain opening, Proper air volume MUST be provided over the evaporator coil. To ensure that the static pressure is within the proper range, take a draft gauge reading as follows: Make drain connections from the 3/4" (19 mm) pipe nipple on pan with a 3/4" (19 mm) drain pipe. Route drain pipe downward to an open drain or sump, Never connect drain to a closed system. Connect main condensate drain and route downward to an open drain or sump. Do not connect drain to a closed waste system. See figure 3 for typical condensate trap configuration. Typical Condensate Drain VENT MUST EXTEND DRAIN ABOVE PAN BY 2 INCHES THE HEIGHT OF THE COIL" (51 MM). VENT CAUTION 1, Remove access panel. 2. Drill two 5/16" (8 mm) air test holes in the right front access panel; hole locations are shown in figure 4. Replace the panel, 3. Connect draft gauge. Zero end of draft gauge scale connects to air entering hole of the coil. Insert gauge hoses into test holes about 5/16" (8 mm), Seal around holes with permagum, 4. Set the thermostat fan switch to ON position with no heating nor cooling demand. Turn on power to the unit; the furnace blower will begin operating, Air Test Hole Locations TRAP MUST BE DEEP ENOUGH TO OFFSET MAXIMUM STATIC DIFFERENCE (GENERALLY, DRAIN PAN 2 INCHES [51MM]). NOTE--Remove panel before drilling test holes. DRAIN LINE SHOULD SLOPE 10 FEET (25 MM PER 3 M) A MINIMUM 1 INCH PER TO APPROVED Figure RIGHT FRONT ACCESS PANEL DRAIN 3 The following practices are recommended to ensure condensate removal: +l 1-1/2" 1/2-4 • Drain piping should not be smaller than the drain connections at drain pan. • A trap must be installed in the main drain line. • The trap must be deep enough to offset the difference in static pressure between drain pan and atmosphere. Generally, two inches is satisfactory for medium static applications. • Horizontal runs must be sloped 1" (25.4mm) per 10' (3m) of drain line to offset friction. 5. Table 3 lists the range of air volumes and equivalent draft gauge readings for this unit, Observe draft gauge reading. If reading is above required air volume, decrease blower speed, Refer to furnace wiring diagram for changing direct drive blower speed, Do not exceed maximum air volume as indicated in diagram blower speed table, • An open vent in the drain line, as illustrated in figure 3, should be used to overcome line length, friction and static pressure. Drains should be constructed in a manner to facilitate future cleaning and not interfere with filter access as illustrated in figure 3. 6. On belt drive blowers, check amperage draw on motor by connecting an ammeter to one leg of the motor supply line. Compare this reading with the full load amps listed on the motor nameplate. The motor pulley must be adjusted not to exceed the motor nameplate full load amps for motor listed, Auxiliary drain should run to an area where homeowner will notice it draining. The auxiliary drain line does not required venting or a trap. Refer to local codes. 7. After required draft gauge readings are obtained, remove draft lines and seal air test holes, • • Page 4 505056M 04/08 Figure 4 8. Set the room thermostat to desired temperature. CR33 Coil Air Volume Dry Coil Model No. 18A-F 24B-F 30/36B-F 48B-F 50/60C-F Resistance in.w.g. Table 3 and Static Pressure Wet Coil Air Volume Pa cfm L/s .05 .08 12 19 370 510 175 240 .10 25 645 .15 37 815 .20 50 .25 Resistance in.w.g. Resistance Dry Coil Air Volume Model Pa cfm L/s No. .05 .07 12 17 255 305 121 144 24A-F 305 .09 22 355 385 .12 30 395 980 465 .15 37 62 1115 525 .18 .30 75 1250 590 .35 87 1395 .40 100 .45 Resistance Pa cfm L/s .o5 .09 12 22 315 465 150 220 167 .14 35 595 186 .20 50 725 435 205 .25 62 44 520 245 .30 20 50 600 284 660 25 62 690 1535 725 .30 75 112 1645 775 .35 .50 125 1760 830 .55 137 1870 .06 15 .09 22 .13 Resistance cfm L/s .05 .10 12 25 335 490 157 231 280 .15 37 600 284 345 .20 50 705 332 825 390 .25 62 790 373 75 910 430 .30 75 870 411 .35 87 1000 470 .35 87 940 444 325 .40 100 1080 510 .40 100 1020 481 775 365 .50 125 1225 580 .45 112 1090 514 86 845 399 .60 150 1370 645 .51 127 1160 547 .39 97 920 433 880 .50 125 1505 711 400 190 .07 17 400 189 .10 25 600 283 .10 25 600 283 500 235 .10 25 500 236 .13 32 700 330 .14 35 700 330 32 600 285 .15 37 600 283 .16 40 800 378 .18 45 800 378 .17 42 700 330 .20 50 700 330 .20 50 900 425 .23 57 900 425 .23 57 800 380 .26 65 800 378 .24 60 1000 472 .27 67 1000 472 .27 67 900 425 .32 80 900 425 .28 70 1100 519 .32 80 1100 519 .33 82 1000 470 .39 97 1000 472 .33 82 1200 566 .38 95 1200 566 .39 97 1100 520 .46 115 1100 519 .38 94 1300 614 .43 107 1300 614 .47 117 1200 565 .54 135 1200 566 .43 107 1400 661 .49 122 1400 661 .05 12 525 245 .05 17 600 283 310 .08 .06 .08 .07 660 194 233 285 19 410 495 600 .08 12 19 15 20 700 330 .10 25 700 330 .10 25 795 375 .10 25 580 273 .10 25 800 380 .13 32 800 378 .15 37 980 465 .15 37 785 371 .13 32 900 425 .17 42 900 425 .20 50 1165 550 .20 50 995 469 .16 40 1000 470 .21 52 1000 472 .25 62 1320 625 .25 62 1155 546 .19 47 1100 520 .25 62 1100 519 .30 75 1475 695 .30 75 1320 624 .22 55 1200 565 .29 72 1200 566 .35 87 1605 760 .35 87 1465 692 .26 65 1300 615 .34 85 1300 614 .40 100 1735 820 .40 100 1610 761 .29 72 1400 665 .38 95 1400 661 .43 107 1805 855 .45 112 1730 816 .46 115 1875 885 .50 125 1850 872 .14 35 1200 566 .17 42 1200 566 .05 12 595 280 .05 12 575 271 .16 40 1300 614 .20 50 1300 614 .10 25 860 405 .10 25 820 386 .19 47 1400 661 .23 57 1400 661 .15 37 1060 500 .15 37 995 469 .22 55 1500 708 .26 65 1500 708 .20 50 1235 580 .20 50 1170 551 .25 62 1600 755 .29 72 1600 755 .25 62 1395 655 .25 62 1320 623 .28 70 1700 802 .32 80 1700 802 .30 75 1545 730 .30 75 1445 682 .30 75 1800 850 .36 90 1800 850 .35 87 1675 790 .35 87 1575 744 .34 85 1900 897 .42 105 1900 897 .40 99 1805 850 .40 100 1710 807 .37 92 2000 944 .45 112 2000 944 .45 112. 1925 910 .45 112 1825 861 .50 124 2030 960 .50 125 1915 904 1395 660 .19 47 1400 661 30/36C-F 48C-F in.w.g. Air Volume Pa 30/36A-F in.w.g. Wet Coil Air Volume .17 42 1395 660 .19 47 1400 661 .18 45 1450 685 .20 50 1450 684 .17 .18 42 45 1450 685 .20 50 1450 684 .19 47 1500 710 .22 55 1500 707 .19 47 1500 710 .22 55 1500 707 .20 50 1545 730 .23 57 1555 733 .20 50 1545 730 .23 57 1555 733 .21 52 1605 755 .24 60 1600 755 .21 52 1605 755 .24 60 1600 755 .22 55 1645 775 .25 62 1645 777 .22 55 1645 775 .25 62 1645 777 .24 60 1700 805 .27 67 1710 807 .24 60 1700 805 .27 67 1710 807 .25 62 1750 825 .28 70 1745 824 .25 62 1750 825 .28 70 1745 824 .27 67 1805 850 .31 77 1800 850 .27 67 1805 850 .31 77 1800 850 .28 70 1845 870 .32 80 1850 874 .28 70 1845 870 .32 80 1850 874 .29 72 1905 900 .33 82 1890 892 .29 72 1905 900 .33 82 1890 892 .30 75 1950 920 .34 85 1950 920 .30 75 1950 920 .34 85 1950 920 .32 80 2000 945 .36 90 2000 944 .32 80 2000 945 .36 90 2000 944 .33 82 2055 970 .38 95 2050 968 .33 82 2055 970 .38 95 2050 968 .35 87 2105 995 .40 100 2105 993 .35 87 2105 995 .40 100 2105 993 .38 94 2150 1015 .43 107 2150 1015 .38 94 2150 1015 .43 107 2150 1015 .39 97 2200 1040 .45 112 2190 1034 .39 97 2200 1040 .45 112 2190 1034 CR33 SERIES 60D-F Page 5 A trained technician or service agency must perform maintenance and service on equipment. At the beginning of each heating or cooling season, indoor coils should be cleaned, Cleaning the coil: 1. Remove the coil from the cabinet and take the coil to an appropriate place to clean it, Do not use hydrofluoric acid, alkaline, or similar chemicals on coils. These chemicals are not necessary to dissolve salt, and may damage the fin coating. Acid washes are used to dissolve oils and greases, which generally are not present on most installations, Do not use alkaline washes to dissolve oxides such as zinc oxide, aluminum oxide, and iron oxide (rust). These three oxides are more corrosion-resistant than base metals. Dissolving or removing them will cause an increase in corrosion. CAUTION 2. Vacuum or brush the coil to remove matted and surface debris from the fin. Use vacuum attachments and /or brushes that are non-destructive to fins, 3. If oil deposits are present, spray the coil with ordinary household liquid detergent, Allow detergent to soften deposits. Wait 10 minutes, NOTE - For units in coastal regions, fresh water will dissolve salt deposits. (Wash coils with fresh water at least every six months,) , 5, Spray the coil at a vertical angle of 30 to 45 degrees with a constant stream of water at moderate pressure. A pressure washer with a fan nozzle will work best, Do not spray the coil from a horizontal direction, Direct the spray so that any debris is washed out of the coil and base pan, For most residential units, hot water is not necessary, NOTE - Attempting to back flush from the inside of the coil will require removing parts from the unit, and it may be very difficult to flush the whole coil surface. Attempting to blow water through a coil will slow the water stream and reduce the flushing action of the outer fin surface. 6. Replace the coil into the cabinet, Page 6 505056M 04_8
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