LENNOX Evaporator Coils Manual L0806270
User Manual: LENNOX LENNOX Evaporator Coils Manual LENNOX Evaporator Coils Owner's Manual, LENNOX Evaporator Coils installation guides
Open the PDF directly: View PDF 
.
Page Count: 9
| Download | |
| Open PDF In Browser | View PDF |
,t_2007 Lennox DatIas, Industries Texas, INSTALLATION INSTRUCTIONS ® Inc. USA C33/CX34 Series Coils EVAPORATOR COILS 505,060M (65594205) _ Technical LL.L[Publications 10/07 Litho U.S.A. Supersedes 06/07 RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE WARNING WARNING CAUTION C33 and CX34 Series Coils ..................... General ...................................... Shipping and Packing List ...................... Releasing Air Charge .......................... Unit Installation ............................... Refrigerant Line Set ........................... Replacement Parts ............................ Connections .................................. Refrigerant Metering Device .................... Leaking Testing, Evaculating and Charging Sealing Ducts ................................. Condensate Drain Connection .................. Blower Speed Connection ...................... Maintenance .................................. ....... 1 1 1 2 2 3 4 4 5 7 7 7 8 9 C33 and CX34 upflow evaporator coils are designed to be used with air conditioner or heat pump units. C33 coils include a factory-installed fixed orifice metering device and are available cased or uncased. CX34 coils include a factory-installed, HFC-410A check (CTXV - heat pumps) or thermostatic (TXV - air conditioner units) expansion valve (externally equalized) and are only available cased. Refer to the Lennox Engineering Handbook for the proper use of these coils with Lennox furnaces, air conditioner units, heat pumps, and line sets. These instructions are intended as a general guide and do not supersede local or national codes in any way. Authorities who have jurisdiction should be consulted before installation. Package 1 of 1 contains the following: C33 A IMPORTANT 1 -- Evaporator coil 1 -- Patch plate with nameplate label (uncased coils only) 1 -- Metering device label (uncased coils only) OR CX34 1 -- Evaporator coil Check the components for shipping damage. If you find any damage, immediately contact the last carrier. 10/07 IIIHllllll]]lll]llllllllll]lllllllll] Page 1 505,060M (65594205) II]lllllllll]llllllllHlllllllllll] Table 1. Orifice Size Shipped with C33 Units Model C33 (Case/and Uncase) NOTE - If there is no pressure when the valve core is pressed, check the coil for leaks before continuing with the installation. Orifice Size C33-18A-2/(2-F) 0.053 C33-19A-2/(2-F) 0.053 C33-24A-2/(2-F) 0.062 C33-24B-2/(2-F) 0.062 C33-24C-2/(2-F) 0.062 C33-25A-2/(2-F) 0.062 C33-25B-2/(2-F) 0.062 C33-30A-2/(2-F) 0.071 C33-30B-2/(2-F) 0.071 C33-30C-2/(2-F) 0.071 C33-31A-2/(2-F) 0.071 C33-31B-2/(2-F) 0.071 C33-36A-2/(2-F) 0.076 C33-36B-2/(2-F) 0.076 C33-36C-2/(2-F) 0.076 C33-38A-2/(2-F) 0.076 C33-38B-2/(2-F) 0.076 C33-42B-2/(2-F) 0.082 C33-43B-2/(2-F) 0.082 C33-43C-2/(2-F) 0.082 C33-44C-2/(2-F) 0.082 C33-48B-2/(2-F) 0.091 C33-48C-2/(2-F) 0.091 C33-49C-2/(2-F) 0.091 C33-50/60C-2/(2-F) 0.091 C33-60D-2/(2-F) 0.099 C33-62C-2/(2-F) 0.099 C33-62D-2/(2-F) 0.099 a WARNING Install the furnace or air handler according to the installation instructions provided with the unit. Cased C33 or CX34 Coils - Position the cased coil on top of the furnace or air handler cabinet and secure it using field-provided screws, NOTE - Cased coils have six screw clearance holes which should be aligned with the furnace engagement holes. Secure the coil casing to the furnace using six field-provided #8 X 1" screws. NOTE - An optional adapter base (ordered separately) is available for use with uncased coils. Order Lennox part no. 81J46 for a single adapter as illustrated in figure 1, and 11L09 for a package of 10 adapters. NOTE - Figure 2 illustrates how to place the uncased coil into the air duct. Note: *C33-18A through C33-62C coils are positioned on the furnace cabinet front-to-rear, as shown, C33-60D and C33-62D are positioned left-to-right on the furnace. a CAUTION DUCT PATCH PLATE ADAPTER __ BASE (OPTIONAL-USEDIN UNCASED The C33 and CX34 coils are shipped with a 15 + 3 psi dry air holding charge. Ensure that the coil is void of pressure by performing the following procedure: COILS ONLY) FURNACE \ 1. Remove valve stem cap, 2. Press the liquid line valve stem. Figure 1. Adapter Base Page 2 505060M 10_7 DUCT (FIELD INSTALLED) COIL SUPPORT INSTALLED UNCASED UNCASED - FIELD - (USED WITH COILS ONLY) COIL* PIPES. Figure 3. Secure Distributor Tubes to Pipes Note: *C33-18A through C33-62C coils are positioned on the furnace cabinet front-to-rear, as shown, C33-60D and C33-62D are positioned left-to-right on the furnace. Figure 2. Field-Installed DO NOT LEAVE DISTRIBUTOR DISTRIBUTOR ES UNSECURED. TUBES _B Coil Support USE WIRE TIRES TO SECURE THE DISTRIBUTOR TUBES TOGETHER. WIRE TIES Installing Patch Plate (Uncased Coils Only - C33) -A two-piece patch plate and metering device label are provided (taped to the top of the coil), To install the plate: NOTE - Either models (C33 or CX34) could be configured as illustrated in either figure 10 or 11, 1. Carefully pull the orifice housing forward through the patch plate opening in the plenum. Do not twist, kink or damage the distributor tubes. Use wire ties to secure tubes to prevent movement that could cause the refrigerant tubing to fail. Adjust the tubes if necessary as illustrated in figures 3 and 4. Figure 4. Secure Distributor Tubes Together 2. Position the orifice housing with the patch plate as illustrated in either figure 10 or 11. Carefully install two #8 X 1/2" sheet metal screws through the patch plate into the orifice housing mounting base. The distributor lines must not be twisted or kinked, A IMPORTANT 3. Install the patch plate onto the plenum. 4. Affix metering device label to front of plenum. The refrigerant line sets should be sized according to the recommendations given in the air conditioner unit installation instructions. Use either table 2 or 3 to determine correct braze connection sizes. A field-provided adapter may be required to match line set connections. Page 3 C33/CX34 SERIES Table 2. Refrigerant Line Connections Model Number Suction 18-2(F) 19-2(F) 24-2(F), -24C-2, -24C-2(F) 25-2(F) 30-2(F), -30C-2, -3OC-2(F) 31-2(F) 36-2(F) 38-2(F) Line Sweat Size 3/4 Inch (19mm) 42-2(F) 43-2(F) 44-2(F) 48-2(F) 49-2(F) 60/60-2(F) 60-2(F) 62C-2(F) 62-2(F) Line Sweat Size 7/8 Inch (22mm) Table 3. Refrigerant Line Connections Model Number Liquid 4. Remove the heat shield after brazing and allow the connections to cool. C33 -- CONNECT LIQUID LINE Use the following procedure to connect the liquid line to the indoor coil unit: 1. Slide the liquid line compression nut onto the provided liquid line fitting (the liquid line fitting comes attached to the front of the delta plate of the uncased coils). 2. Insert the field-supplied liquid line into the liquid line stub for brazing. - Model CX34 Liquid Line Sweat Size 3/4 Inch (1gram) 42-6(F) 43-6(F) 44/48-6(F) 49-6(F) 50/60-6(F) 60-6(F) 62-6(F), -62C-6(F) 1. Remove rubber plug. 2. Place a field-provided heat shield, such as a wet rag, against the piping plate and around the piping stubs, and sweat in the suction line. The heat shield must be in place to protect the paint from heat damage. 3. Braze connection. Line Sweat Size 3/8 Inch (9.5mm) Suction 18/24-6F 19-6(F) 24-6(F), -24C-6(F) 25-6(F) 30-6E -3OC-6(F) 31-6(F) 36-6(F) 38-6(F) C33/CX34 -- BRAZE SUCTIONNAPOR LINE Use the following procedure to connect the vapor line to the indoor coil unit: - Model C33 CX34 -- CONNECT LIQUID LINE Use the following procedure to connect the liquid line to the indoor coil unit. Connect the field-provided liquid line to the liquid line of the cased coil as illustrated in figure 6 using one of the following procedures: Line Sweat Size 3/8 Inch Line Sweat Size 7/8 Inch (9.5mm) (22ram) If replacement parts are necessary, order kit 69J46. The kit includes: • 10 -- Brass nuts for liquid line assemblies • 20 -- Teflon rings • 10 -- Liquid line orifice housings • 10 -- Liquid line assemblies LIQUID LINE ORIFICE HOUSINGS (10) 1. Place a field-provided heat shield, such as a wet rag, against the piping plate and around the piping stubs, and braze in the liquid line. The heat shield must be in place to protect the metering device from heat damage. 2. Braze the brass seal assembly out of the swedged copper liquid line on the coil; braze field-provided liquid line into the swedged connection. OR 3. Cut the copper liquid line on a vertical or horizontal section. Use a field-provided coupling to join the field liquid line and coil liquid line connections. 4. Remove the heat shield after brazing and allow the connections to cool. J PISTON RETAINER REMOVE AND DISCARD STEM ASSEMBLY (IF PRESENT) / TEFLON RINGS (20) UNBRAZE / / BRASS "_ E] L,QU,D UNE ASSEMSL,ES (INCLUDES STRAINER) (10) Figure 5.69J46 CUT TWO INCHES NUTS (I 0) L_ _" STRAINER ] ]--O%ER COIL LIQUID SWEDGED CONNECTION \ LIQUID LINE ASSEMBLY COUPLING Kit Components Use a silver alloy brazing rod (5 or 6 percent silver alloy for copper-to-copper connections or 45 percent silver alloy for copper4o-brass or copper-to-steel connections). Page 4 10/07 \ AT FITTING LINE CUT TWO INCHES 505060M UP OUT Note: Use the coupling at either of the two cut connections. Figure 6. Liquid Line Connections DISTRIBUTOR Beloware the factory-installed meteringdevicesand optionalmeteringdevicesif applicableto bothtypesof coils. • TheC33coilsareshipped witha factory-installed fixed orifice.C33casedanduncasedcoilsarecompatible with eitherHFC-410Afixed orificeor TXV/CTXV meteringdevices, • CX34casedcoilshavefactory-installed HFC-410A TXV/CTXVmeteringdevices, Thepreviously reference TXV/CTXV metering deviceswill bereferredto inthisinstruction as TXV, DETERMINING CORRECT FIXEDORIFICE A properlysizedfixedorificemaybe providedwith the outdoorunit.Refertotheoutdoorunitinstruction toensure propersizingof the refrigerantflow controlorifice.An improperlysized RFC orificecan lead to diminished capacities and/orefficiencies, aswellaspotential damage tothe unit,RFCsshippedwiththe coilsareidentifiedin table1. TUBES LIQUID LINE ORIFICE TEFLON HOUSING RING REMOVE ORIFICE AND DISCARD VALVE STEM ASSEMBLY (IF PRESENT) # / BRASS NUT LIQUID LINE ASSEMBLY (INCLUDES STRAINER) VALVE STEM VALVE STEM CAP (Uncased Coil Shown) Figure 8. Typical Fixed Orifice Removal C33 - TYPICAL FIXED ORIFICE INSTALLATION PROCEDURE 1, Ensure that the orifice is installed with the nylon seat pointing toward the liquid line orifice housing, I/2TURN I_I/8 , TURN , Figure 7. Tightening Insert the Teflon ring securely into the liquid line orifice housing. Lightly lubricate the threads of the liquid line orifice housing and the expose surface of the Teflon ring, Connect the liquid line assembly with the brass nut to the liquid line orifice housing. Finger tighten and use an appropriately sized wrench to turn an additional 1/2 turn clockwise as illustrated in figure 7, or 20 ftqb, 4. Place the supplied fixed orifice sticker on the indoor cabinet after installation. Distance C33 - TYPICAL FIXED ORIFICE REMOVAL PROCEDURE 1. On fully cased coils, remove the coil access and plumbing panels. 2. Remove any shipping clamps holding the liquid line and distributor assembly, 3. Using two wrenches, disconnect liquid line from distributor. Take care not to twist or damage distributor tubes during this process, 4. Remove and discard orifice, valve stem assembly if present and Teflon ring as illustrated in figure 8. 5. Retain brass nut to be using later with the liquid line assembly. Figure 9. Typical Fixed Orifice Installation Page 5 C33/CX34 SERIES C33 - TYPICAL TXV INSTALLATION PROCEDURE The TXV unit can be installed internal or external to the indoor coil. In applications where an uncased coil is being installed in a field-provided plenum, install the TXV in a manner that will provide access for field servicing of the TXV. Refer to figures 10 or 11 for reference during installation of TXV unit. (Uncased TWO PIECE PATCH PLATE UNCASED COIL ONLY) LIQUID LINE ORIFICE HOUSING 1, Insert one of the provided Teflon rings into the stubbed end of the TXV, Lightly lubricate the threads of the stubbed end of the TXV and the expose surface of the Teflon ring. 2, Attach the stubbed end of the TXV to the liquid line orifice housing, Finger tighten and use an appropriately sized wrench to turn an additional 1/2 turn clockwise as illustrated in figure 7, or 20 ft-lb, Coil Shown) 3, Place the remaining Teflon washer around the other end of the TXV and lightly lubricate the threads of the that end of the TXV, and the expose surface of the Teflon ring, STUB END TXV DISTRIBUTOR TUBES RING 4, Attach the liquid line assembly with brass nut to the TXV. Finger tighten and use an appropriately sized wrench to turn an additional 1/2 turn clockwise as illustrated in figure 7, or 20 ft-lb, SENSING LINE 5, Attach the sensing bulb of the TXV in the proper orientation as illustrated in figure 12 to the suction line using the clamp and screws provided. On lines smaller than 7/8", mount sensing bulb at either the 3 or 9 o'clock Suction Line .. (Bu,b MALE EQUALIZER LINE FITTING (SEE FIGURE 13 FOR FURTHER DETAILS) Bu,b ) LIQUID LINE Sensing bulb insulation is required if mounted external to the coil casing. See figure 12 for bulb positioning. On 7/8" and larger lines, mount sensing bulb at Suction Line _ Figure 10. Patch Plate (Configuration O" I A) • _. ,_, , \\ _.___ _.,/_/either "_\\_q I position, never mount on bottom of line. the 4 or 8 o'clock (uncased coil shown) MALE EQUALIZER , PIECE PATCH LINE PLATE NOTE - Never mount on bottom of line. FITTING (SEE FIGURE 13 FOR FURTHER VAPOR LINE f Sensing bulb insulation is required if mounted external to the coil casing. See figure 12 for bulb positioning, SENSING S_BNuSIBN _ "UB END TXVTEFLON RING Figure 12. TXV Sensing NOTE - To prevent any possibility of water damage, properly insulate all parts of the TXV assembly that may sweat due to temperature differences between the valve and its surrounding ambient temperatures. 6. Connect the equalizer line from the TXV to the equalizer suction port on the suction line. Finger tighten the flare nut plus 1/8 turn (7 ft-lbs) as illustrated in figure 7. TEFLON RING LIQUID LINE ORIFICE HOUSING DISTRIBUTOR TUBES Xk IMPORTANT LIQUID LINE ASSEMBLh WITH BRASS NUT Figure 11. Patch Plate (Configuration B) Page 6 505060M 10/07 Bulb Installation A IMPORTANT FLAREcApSEAL _._ OR ,_ _FLARE NUT --FLARE SEAL COPPER BONNET I (REMOVE) I -- MALE BRASS EQUALIZER A IMPORTANT _ LINE FITTING SUCTION LINE Figure 13. Copper Flare Seal Bonnet Removal See the C33/CX34 Engineering Handbook for approved TXV match-ups and application information, Typically, the TXV kits include the following: 1 -- TXV 2 -- Teflon rings 1 -- 1 1/4" wide copper mounting strap for sensing bulb 2 -- #10 hex head bolts and nuts for securing sensing bulb VENT MUST EXTEND DRAIN ABOVE PAN BY 2 INCHES THE HEIGHT OF THE COIL" (51 MM). VENT DRAIN PAN TRAP MUST BE DEEP ENOUGH TO OFFSET %1%51(°? s @ TEFLON MAXIMUM 2 INCHES STATIC DIFFERENCE [51MM]). TRAP (49P66) DRAIN LINE SHOULD SLOPE 10 FEET (25 MM PER 3 M) COPPER MOUNTING RINGS STRAP (2) (I) (GENERAL A MINIMUM 1 INCH PER Figure 15. Typical Condensate Figure 14. TXV Kit Components Refer to the outdoor unit instruction for leak testing, evacuating and charging procedures, Always leak check entire system before charging, Ensure the duct is secured and all joints are properly sealed to either the coil cabinet flanges (fully cased models) or the furnace cabinet flanges (uncased models), TO APPROVED DRAIN Drain Connection 1, Install a trap in both drain lines per local codes, Ifa vent tee is required to reduce friction and static pressure, the trap should be installed between the unit outlet and the vent tee as illustrated in figure 15, 2, Make drain connections at the 3/4" female threaded pipe using condensate lines d the same size. Pitch the main drain line down to an open drain or sump. 3, If the auxiliary drain line is to be used, remove the plug and route the drain line so that water draining from the outlet will be easily noticed by the homeowner. 4, After removal of drain pan plugs, check the drain port to see if holes have been drilled. If not drilled, use a 19/32" bit to drill out the primary drain hole; use a 3/8" drill bit for the secondary drain hole, Remove all drill shavings. 5, Make sure drain ports and drain pan are free of all debris. C33(F) and CX34(F) coils have both main and auxiliary drain connections, The auxiliary drain removes accumulated condensate if the main drain becomes plugged, 6, Plug and check any unused drain pan openings for tightness. Tighten plugs to 1/8 tum or 7 ft-lb, to prevent water leaks or seepage from the drain pan, Page 7 C33/CX34 SERIES 5. Tables 4 and 5 lists the range of air volumes and equivalent static pressure readings for these units. Observe the static pressure reading. If the reading is below the required air volume, increase the blower speed; if the reading is above the required air volume, decrease the blower speed. Refer to the furnace wiring diagram for blower speed settings, 6. When the required static pressure readings are obtained, remove the test hose lines and insert snaphole plugs into test holes, TEST HOLES Table 4. Air Volume / Static Pressure Drop Across Coil - Model LEFT-HAND AIR DISCHARGE (TOPVlEW) Cabinet Model Width in. (ram) C33 Voh CFM Drop: in. w.g. (Pa) (L/s) Dry Wet 18A-2(F) 14-1/2 (394) 600 (285) .14 (35) .17 (42) 19A-2(F) 14-1/2 (394) 6OO (285) .O8 (2O) .09 (22) 24A-2(F) 24B-2(F) 14-1/2 (394) 17-1/2 (444) 8O0 (38O) .18 (45) .25 (62) 24C-2(F) 21 (533) 800 (380) .16 (40) .22 (55) 25A-2(F) 14-1/2 (394) 800 (380) .16 (40) .22 (55) 25B-2(F) 17-1/2 (444) 800 (380) .11 (27) .15 (37) 30C-2(F) 21 (533) 1000 (470) .20 (50) .28 (70) 30A-2(F) 30B-2(F) 14-1/2 (394) 17-1/2 (444) 1000 (470) .22 (55) .3O(75) 31A-2(F) 14-1/2 (394) 1000 (470) .18 (45) .2O(50) 31B-2(F) 17-1/2 (444) 1000 (470) .13 (32) .16 (40) 36A-2(F) 14-1/2 (394) 1200 (565) .27 (67) .3O(75) 36B-2(F) 17-1/2 (444) 1200 (565) .17 (42) .21 (52) 38A-2(F) 14-1/2 (394) 1200 (565) .27 (67) .3O(75) 38B-2(F) 17-1/2 (444) 1200 (565) .17 (42) .21 (52) 36C-2(F) 21 (533) 1200 (565) .17 (42) .21 (52) 42B-2(F) 17-1/2 (444) 1400 (660) .22 (55) .28 (70) 43B-2(F) 17-1/2 (444) 1400 (660) .23 (57) .24 (60) 1. Drill one 5/16" (8 mm) air test hole into the delta plate between the coil slabs, 43C-2(F) 21 (533) 1400 (660) .13 (32) .16 (40) 44C-2(F) 21 (533) 1400 (660) .18 (45) .23 (57) 2. Drill one 5/16" (8 mm) air test hole into the duct above the top of the coil, 48B-2(F) 17-1/2 (444) 1600 (755) .17 (42) .21 (52) 48C-2(F) 21 (533) 1600 (755) .23 (57) .29 (72) 3. Connect the instrument for static pressure measurement hoses to the air entering side of coil. Insert the hoses so that 1/4" (6 mm) extends inside the duct or end seal, Seal around holes with Permagum, 49C-2(F) 21 (533) 1600 (755) .17 (42) .22 (55) 50/60C-2(F) 21 (533) 1600 (755) .23 (57) .29 (72) 60D-2(F) 24-1/2 (622) 2000 (945) .21 (52) .27 (67) 62C-2(F) 24-1/2 (622) 2000 (945) .29 (72) .34 (85) 62D-2(F) 24-1/2 (622) 2000 (945) .21 (52) .27 (67) Figure 16. Static Pressure Test CAUTION Proper air volume must be provided over the evaporator coil. Select a blower motor speed tap that will provide 400 _+ 50 CFM per 12,000 Btuh of cooling capacity (wet coil). A static pressure reading must be taken to see if the pressure drop falls within the proper range, To ensure accuracy, air must be read from below the coil and above the coil. See figure 16 for an example to obtain an accurate reading, 4. Turn on electrical power to the furnace and set the thermostat to initiate a cooling demand. Page 8 505060M 10/07 Table 5. Air Volume / Static Pressure Drop Across Coil - Model CX34 Cabinet Model Width in. Vol: CFM (L/s) (mm) Drop: in. w.g. (Pa) Dry Wet 18/24A-6(F) 14-1/2 (394) 800 (380) .18 (45) .25 (62) 19A-6(F) 14-1/2 (394) 600 (285) .O8 (2O) .09 (22) 24B-6(F) 17-1/2 (444) 800 (380) .18 (45) .25 (62) 24C-6(F) 21 (533) 800 (380) .16 (40) .22 (55) 24B-6(F) 21 (533) 1000 (470) .2O (5O) .28 (70) 25A-6(F) 14-1/2 (394) 800 (380) .16 (40) .22 (55) 25B-6(F) 17-1/2 (444) 800 (380) .11 (27) .15 (37) 30A-6(F) 30B-6(F) 14-1/2 (394) 17-1/2 (444) 1000 (470) .22 (55) .30 (75) 31A-6(F) 14-1/2 (394) 1000 (470) .18 (45) .20 (50) 31B-6(F) 17-1/2 (444) 1000 (470) .13 (32) .16 (40) 36A-6(F) 14-1/2 (394) 1200 (565) .27 (67) .30 (75) 36B-6(F) 17-1/2 (444) 1200 (565) .17 (42) .21 (52) 38A-6(F) 14-1/2 (394) 1200 (565) .27 (67) .30 (75) 38B-6(F) 17-1/2 (444) 1200 (565) .17 (42) .21 (52) 36C-6(F) 21 (533) 1200 (565) .17 (42) .21 (52) 42B-6(F) 17-1/2 (444) 1400 (660) .22 (55) .28 (70) 43B-6(F) 17-1/2 (444) 1400 (660) .23 (57) .24 (60) 43C-6(F) 21 (533) 1400 (660) .13 (32) .16 (40) 44/48C-6(F) 21 (533) 1400 (660) .18 (45) .23 (57) 48B-6(F) 17-1/2 (444) 1600 (755) .17 (42) .21 (52) 49C-6(F) 21 (533) 1600 (755) .17 (42) .22 (55) 50/60C-6(F) 21 (533) 1600 (755) .23 (57) .29 (72) 60D-6(F) 24-1/2 (622) 2000 (945) .21 (52) .27 (67) 62C-6(F) 24-1/2 (622) 2000 (945) .29 (72) .34 (85) 62D-6(F) 24-1/2 (622) 2000 (945) .21 (52) .27 (67) 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. 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. Alkaline washes are useful for dissolving oxides such as zinc oxide, aluminum oxide, and iron oxide (rust). These three oxides are more corrosion-resistant than base metals, so dissolving or removing them will cause an increase in corrosion. CLEANING THE COIL: 1. Remove the coil from the cabinet or plenum, and take the coil to an appropriate place to clean it. 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 and wait 10 minutes. NOTE - For units in coastal regions, fresh water will dissolve away any salt deposits. (Wash coils with fresh water at least every six months.) 4. 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. 5. Direct the spray so that any debris is washed out of the coil and basepan. 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 or plenum. Ensure that you have followed the proper procedure for routing and securing the refrigerant tubing. Xk CAUTION A IMPORTANT Page 9 C33/CX34 SERIES
Source Exif Data:
File Type : PDF File Type Extension : pdf MIME Type : application/pdf PDF Version : 1.2 Linearized : No Page Count : 9 Page Layout : SinglePage Page Mode : UseNone Producer : Goby Monitor Application version 4, 0, 0, 13 Create Date : Mon Jun 30 04:46:59 2008 Author : Title : Subject :EXIF Metadata provided by EXIF.tools