LENNOX Evaporator Coils Manual L0806274
User Manual: LENNOX LENNOX Evaporator Coils Manual LENNOX Evaporator Coils Owner's Manual, LENNOX Evaporator Coils installation guides
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INSTALLATION INSTRUCTIONS ® ,t_2007 Lennox Industries Inc. Dallas, Texas, USA CH33 Series Units EVAPORATOR COILS 505,264M (65484504) 10/07 Supersedes 09/06 RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE WARNING WARNING CAUTION n ical blications Litho U.S.A. _puTeCh CH33 Series Coils ............................. General ...................................... Shipping and Packing List ...................... Releasing Air Charge .......................... Unit Installation ............................... Refrigerant Line Set ........................... Connections .................................. Refrigerant Metering Device .................... Leak Testing, Evacuating and Charging .......... Blower Speed Connection ...................... Condensate Drain Connection .................. Maintenance .................................. 1 1 1 2 2 3 4 4 6 6 7 7 CH33 horizontal evaporator coils are designed for use with air conditioner or heat pump units. Each coil is equipped with a compression fitting that provides convenient field installation of a refrigerant metering device. Either a refrigerant metering orifice (factory installed in coils and provided with some Lennox air conditioner units) or a thermostatic expansion valve (ordered separately) may be used in air conditioner unit applications. A check expansion valve (ordered separately) is the only metering device approved for use in heat pump applications. Refer to the CH33 Engineering Handbook for proper use of these coils with Lennox furnaces, air conditioner units, heat pumps and line sets. IMPORTANT These instructions are intended as a general guide and do not supersede local or national codes in any way. Consult authorities who have jurisdiction before installation. Package 1 of 1 contains the following: 1 -- CH33 evaporator coil Check the components for shipping damage. If you find any damage, immediately contact the last carrier. 10/07 [[IHHI[IIIII[HI[[III[IIIH[[II[[III Page 1 505,264M (65484504) [III[IHHIIII[IH[IHI[IIH Table 1. Orifice Size Shipped with CH33 Model Number. Orifice CH33-18A-2F 0.053 CH33-19A-2F 0.053 CH33-24/30A-2F 0.062 CH33-25A-2F 0.062 CH33-25B-2F 0.062 CH33-31A-2F 0.071 CH33-31 B-2F 0.071 CH33-36A-2F 0.076 CH33-36B-2F 0.076 CH33-36C-2F 0.076 CH33-42B-2F 0.082 CH33-43B-2F 0.082 CH33-43C-2F 0.082 CH33-44/48-2F 0.082 CH33-48C-2F 0.091 CH33-49C-2F 0.091 CH33-50/60C-2F 0.091 CH33-60D-2F 0.099 CH33-62D-2F 0.099 Size 1, Install the furnace per the installation instructions provided with the unit. 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 guard against heat damage to the paint. NOTE - In areas of high humidity, the suction line section in the air stream in the cabinet should be insulated with foam tape. See figure 1. FOAM TAPE CAUTION Figure 1. Discharge The CH33 coil are shipped with a 15+ 3 psi dry air holding charge. Ensure that the coil is void of pressure by performing the following procedure: I a WARNING End of Coil 3, Left-Hand and Right-Hand Discharge--The coil must have a 1/2" slope from the rear of the cabinet to the drain. Position the coil adjacent to the furnace cabinet and align the six screw clearance holes in the coil casing with the furnace engagement holes. Use six field-provided #8 X 1" screws to secure the coil casing to the furnace (see figures 2 and 3), 4, Right-Hand Air Discharge with Field-Provided Spacer--The coil must have a 1/2" slope from the rear of the cabinet to the drain. Position the coil in the left-to-right configuration connection on the service access side of the furnace (see figure 4). Position the field-provided spacer between the furnace and the coil. Use field-provided screws to secure the coil casing, spacer and the furnace together. The spacer should be long enough to allow room for proper installation (approximately six inches minimum). NOTE: When the coil is connected directly with a condensing furnace, the coil must be level from return end to supply end. The front (access side) of the furnace may be pitched down up to one-inch to accommodate a 1/2" pitched coil. 5, Secure the supply duct to the coil cabinet, 6, Refer to the instructions provided with the condensing unit for leak testing, evacuating and charging procedures. Always check the entire system for leaks before charging. 1. Remove valve stem cap, 2, Press the liquid line valve stem, NOTE - If there is no pressure when the valve core is pressed, check the coil for leaks before continuing with the installation, Page 2 505264M 10/07 7, Applications using CH33-62 "D" width unit with "C" width furnace--Figure 5 shows an application that includes a "D" width coil and a "C" width furnace. This application requires an insulated, field-supplied block-off plate be constructed to cover the open space on the coil housing, Supply "Air Unit Coil _ Test Hole Supply Air Unit Rear Back Front Slope 112" (13 mm) Coil _ _l Drain 90% Gas Furnace Drain (Supply Air End View) Plumbing Connections Supply Air Unit Front Figure 2. Left-Hand Air Discharge Supply Air Unit Rear Plumbinq Connections Supply Air Unit _. Supply Air Unit Front [' Coil b Coil Front Slope 1/2" II T/ i Test Hole Drain (Supply Air End View) NOTE - Use of this orientation is acceptable for 80% AFUE furnaces. Do not use this orientation for 90% condensing furnaces. Supply Air Unit Front Figure 3. Right-Hand Air Discharge Test Hole Supply Air Unit Rear iiiiiiiiiiiiiiii!!!!!!!!!!!!!!!!!_i!iii!i_iil;!i ..... Plumbing Connections \ / Supply Air Unit Front Spacer (6 in. 152 mm min.) Figure 4. Right-Hand Air Discharge with Spacer Field-fabricated insulated block-of[ plate Sealing Ducts - Ensure ducts are secured and all joints properly sealed to either the coil cabinet flanges or the furnace cabinet flanges. Test Hole IMPORTANT Supply Air Unit Rear Plumbing Connections SupplyAir Unit Front Figure 5. "D" Width Coil wl"C" Width Furnace Leak Testing, Evacuating,Charging - Refer to the instructions provided with the outdoor unit for leak testing, evacuating and charging procedures. Always leak check entire system before charging. The refrigerant line sets should be sized according to the recommendations given in the outdoor unit installation instructions. See table 1 for sweat connection sizes. A field-provided adapter may be required to match line set connections. Page 3 CH33 SERIES Table CH33 Model -18-F -19-F -24/30-F -25-F -31-F -36-F . Refrigerant Line Connections Suction (Vapor) 4. Remove the heat shield after brazing and allow the connections to cool. Liquid CONNECT LIQUID LINE Use the following procedure to connect the liquid line to the indoor coil unit: Line Sweat Size 314 Inch (19mm) 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. Line Sweat Size 3/8 Inch (9.5mm) -42-F -43-F -44/48-F -48-F -49-F -50/60-F -60-F -62-F Line Sweat Size 7/8 Inch (22mm) The CH33 coils are shipped with a factory-installed fixed orifice, CH33 coils are compatible with either HFC-410A fixed orifice or TXV/CTXV metering devices. The previously reference TXV/CTXV metering devices will be referred to in this instruction as TXV, 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 TEFLON ! HOUSINGS RINGS / BRASS "_ _/RETAINER NUTS STRAINER) (10) I/2TURN (I0) _ _11111_1 L_ L,QU,D UNE ASSEMBL,ES " (INCLUDES CORRECT FIXED ORIFICE PISTON (10) (20) DETERMINING A properly sized fixed orifice may be provided with the outdoor unit. Refer to the outdoor unit instruction to ensure proper sizing of the refrigerant flow control orifice. An improperly sized RFC orifice can lead to diminished capacities and/or efficiencies, as well as potential damage to the unit, RFCs shipped with the units are identified in table 1. _ STRAINER O%ER LIQUID LINE ASSEMBLY Figure 6. 69J46 Kit Components Figure 7. Tightening Distance TYPICAL FIXED ORIFICE REMOVAL PROCEDURE Use a silver alloy brazing rod (5 or 6 percent silver alloy for copper-to-copper connections or 45 percent silver alloy for copper-to-brass or copper-to-steel connections). BRAZE SUCTION/VAPOR LINE Use the following procedure to connect the vapor line to the indoor coil unit: 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. Page 4 505264M 10/07 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. DISTRIBUTOR TUBES (Uncased Coil Shown) LIQUID LINE ORIFICE TEFLON TWO PIECE PATCH PLATE dNCASED COIL HOUSING RING REMOVE ORIFICE AND DISCARD LIQUID LINE ORIFICE HOUSING STUB END )ISTRIBUTOR TUBES VALVE STEM ASSEMBLY (IF PRESENT) TXV RING BRASS / NUT SENSING LINE LIQUID LINE ASSEMBLY (INCLUDES STRAINER) VALVE STEM VALVE STEM CAP (Uncased Coil Shown) Figure 8. Typical Fixed Orifice Removal MALE EQUALIZER LINE FITTING (SEE FIGURE 12 FOR FURTHER DETAILS) TYPICAL FIXED ORIFICE INSTALLATION PROCEDURE 1. Ensure that the orifice is installed with the nylon seat pointing toward the liquid line orifice housing, 2. 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, LIQUID LINE Sensing bulb insulation is required if mounted external to the coil casing. See figure 11 for bulb positioning. Figure 10. Typical TXV Installation 3. 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. DISTRIBUTOR TUBES LIQUID \ LINE ORIFICE TEFLON HOUSING RING ORIFICE J / BRASS NUT LIQUID LINE ASSEMBLY (INCLUDES STRAINER) (Uncased Coil Shown Figure 9. Typical Fixed Orifice Installation 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 figure 10 for reference during installation of TXV unit, Figure 11. TXV Sensing Bulb Installation 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, 3. Place the remaining Teflon ring 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, Page 5 CH33 SERIES 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 if-lb. 5, Attach the sensing bulb of the TXV in the proper orientation as illustrated in figure 11 to the suction line using the clamp and screws provided in the TXV kit. Refer to the outdoor unit instruction for leak testing, evacuating and charging procedures, Always leak check entire system before charging, 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, 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 drops are within the proper range. See figure 14 to see for an example to obtain an accurate reading. A IMPORTANT Left-HandAir Discharge (TopView) TEST HOLE 1 Supply Air Unit Rear AIR FLARE SEAL CAP ,miD,, [ "_'1 r AIR RETURN DUCT 1 [_ I I OR _ FLARE NUT ._ FLARE SEAL ) COPPER TEST BONNET ] _I HOLE 2 (REMOVE) I ,R SS E? ,ZER Supply Air Unit Front Figure 14. Static Pressure Test To ensure accuracy, test the air on both sides of the coil (figure 14 exemplifies the two test hole locations). SUCTION/VAPOR LINE CAUTION Figure 12. Copper Flare Seal Bonnet Removal 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. See the CH33 Engineering Handbook for approved TXV match-ups and application information. Typically, the TXV kits include the following: 1 -- TXV Model CH33 Cabinet Width in (mm) Volume: CFM (L/s) Drop: in. w.g. (Pa) [Dry] [Wet] 2 -- Teflon rings -18-F 14-1/2 (394) 600 (285) .14 (35) .17 (42) 1 -- 1 1/4" wide copper mounting strap for sensing bulb -19-F 14-1/2 (394) 800 (380) .15 (37) .17 (42) 2 -- #10 hex head bolts and nuts for securing sensing bulb -25-F -25-F 14-1/2 (394) 17-1/2 (444) 800 (380) 800 (380) .15 (37) .09 (22) .19 (47) .11 (27) -24/30-F 14-1/2 (394) 1000 (470) .22 (55) .30 (80) -31-F -31-F 14-1/2 (394) 17-1/2 (444) 1000 (470) 1000 (470) .24 (60) .14 (35) .27 (67) .16 (40) -36-F -36-F -36-F 14-1/2 (394) 17-1/2 (444) 21 (533) 1200 (565) 1200 (565) 1200 (565) .27 (67) .17 (42) .17 (42) .30 (75) .21 (52) .21 (52) -42-F 17-1/2 (444) 1400 (660) .22 (55) .28 (70) -43-F -43-F 14-1/2 (394) 17-1/2 (444) 1400 (660) 1400 (660) .26 (65) .18 (45) .31 (77) .21 (52) -44/48-F 17-1/2 (444) 1400 (660) .18 (45) .23 (57) -48-F 21 (533) 1600 (755) .17 (42) .21 (52) 49-F 21 (533) 1600 (755) .25 (62) .29 (72) -50/60-F 21 (533) 1600 (755) .23 (57) .29 (72) -60/62-F 24-1/2 (622) 2000 (945) .21 (52) .27 (67) AND NUTS (2) @ TEFLON %/'/ COPPER MOUNTING RINGS STRAP (2) (1) /% Figure 13. TXV Kit Components Page 6 505264M 10/07 Table 2. Air Volume/Static Pressure Drop Across Coil 1, Drilla 5/16"(8 mm)testholeinthecoilcase1"from the furnaceflange(figure14,test hole1). 2. Drilla 5/16"(8 mm)testholeintotheair supplyduct connectedto thecoil.(testhole2 in figure14), 3, Connectthezero end of the draft gauge scale to the 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. furnace end of the coil. Insert the hoses so that 1/4" (6 mm) extends inside the duct or end seal, Seal around holes with Permagum. 4, Turn on the electrical power to the furnace and set the thermostat to initiate a cooling demand. 6. Plug and check any unused drain pan openings for tightness. Torque plugs to 30 in. lb. to prevent water leaks or seepage from the drain pan. 5, Table 2 lists the range of air volumes and equivalent draft gauge readings for this unit. Observe the draft gauge reading and if below the required air volume, increase the blower speed; if above the required air volume, decrease the blower speed. Refer to the furnace wiring diagram for blower speed settings. Xk IMPORTANT 6. When the required draft gauge readings are obtained, remove the draft gauge lines and insert snaphole plugs into the test holes, IMPORTANT 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. Vent must extend above the height of the coil drain pan by 2 inches (51 mm). Do not use hydrofluoric acid, alkaline, or similar chemicals on all 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. VENT DRAIN PAN Trap must be deep enough to offset maximum static difference (Generally, 2 inches [51ram]). Drain line should slope a minimum 1 inch per 10 feet (25 mm per 3 m) Figure 15. Typical Condensate k k _v_ 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. _ TRAP (49P66) TO APPROVED _, DRAIN Xk CAUTION Drain Connection CH33 evaporator coils have both main and auxiliary drain connections, The auxiliary drain removes accumulated condensate if the main drain becomes plugged, 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. See figure 15, 2. Make drain connections at the 3/4" female threaded pipe using condensate lines of the same size. Pitch the main drain line down to an open drain or sump, Page 7 CH33 SERIES 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, Wait 10 minutes, 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, 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, Page 8 505264M 10/07 A IMPORTANT
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