Installation,Start-Up and Service Instruction
Contents
1. M om Nr ER josho FURNACE HORIZONTAL LEFT AIR DISCHARGE AIR INLET FURNACE HORIZONTAL RIGHT A88109 Fig 2 Airflow Flexibility of Furnace to CD3A CD3B Coil Table 1 Parts List ITEM PARTS Top plate Filler plate 042 and 048 sizes Use the following procedure to attach the duct flanges plates bands and duct angle preparatory to mounting the CD3A horizontal coil in either a crawl space or an attic 1 Position coil as shown in Fig 3A then remove corner post screw indicated and lay post aside 2 Select 2 of 4 identical plates and position so that side with five holes faces inward on casing Drive screw removed in step 1 through hole in plate into corner post See Fig 3B 3 Drive screw removed in step 1 through hole in plate into corner post and install middle screw indicated in Fig 3B 4 Repeat steps 2 and 3 at other end of coil to install corner post and middle screws in remaining top plate See Fig 3B Note that side of the plate with 5 holes should face inward 5 Rotate unit 90 so that condensate drain refrigerant connections side is now on top Repeat steps 2 3 and 4 to install 2 bottom plates See Fig 3B 6 Return unit to original upright position Move a rear band into place over a top and a bottom plate See Fig 3C Notice that 2 of the large holes on the long surface of the band should fit over an installed sheet metal screw Make sure that rear band is oriented so tha2. proper condensate drainage 4 Using appropriate fasteners for type of duct being used connect supply air duct to coil PROCEDURE 3 HORIZONTAL CRAWL SPACE INSTALLATION As an alternate to the horizontal attic installation the CD3A CD3B Horizontal Coil can be installed in a crawl space by mounting on suitable blocks pads or by hanging from floor joists To suspend the CD3A CD3B 1 Select and cut to desired length 4 threaded 3 8 in hanger rods 2 Drill 1 2 in holes through pilot holes provided at 4 corners of coil casing on both top and bottom 3 Thread 3 8 in rods through 1 2 in holes at 4 corners of unit and secure each under casing with 1 x 3 8 in flat washer and two 3 8 in nuts See Fig 6 STEP 1 REMOVE SCREW A88105 A88103 j C SELF TAPPING DRILL AFTER SCREWS COIL IS INSTALLED Qe J 7 l DUCT ANGLE 8 SHOWN INSTALLED A88104 A88106 D Fig 3 Duck Flanges Assembly 4 Position coil in front of furnace discharge end The flanges on the coil casing plates and rear band should wrap around 3 sides of the furnace and extend over the furnace casing when the coil is moved into position against the discharge end of the furnace See Fig 3D 5 Secure coil and furnace together by driving 8 self tapping screws through coil flanges into furnace casing through holes provided in plates and bands 6 Make sure that coil i
3. provided from this pan and must be run into an open drain where it can be seen by the owner of the building The occupant should be informed that when water flows from this pipe the coil needs servicing Local codes may call for additional precautions and should be consulted before installation SERVICE Clean and inspect the coil condensate pan and drain before each cooling season Refer to the outdoor unit Installation Instructions for system start up and refrigerant charging details A RETAINER RUBBER O RING NN FROM COIL aes __ TO DRAIN 5 YL PISTON Y A92189 Fig 7 Typical Condensate Drain Trap Fig 8 Refrigerant Metering Device A88573 PROCEDURE 1 CLEANING COIL AND CONDENSATE PAN ON MODEL CD3A CD3B 1 Remove front access panel from coil by removing screws securing panel to enclosure 2 Use vacuum cleaner nozzle to clean face of coil Be careful not to damage fins 3 Disconnect condensate drain at drain pan connection 4 Clean condensate pan with a brush 5 Hold pail under condensate pan drain connections and flush pan by slowly pouring water on coil Do not overflow the pan 6 Reinstall front access panel PROCEDURE 2 METERING DEVICE REPLACEMENT OR CLEANING 1 Pump down condensing unit See Service Manual Split System Residential Air Conditioner and Heat Pump available from your dealer Shut off service valves at condensing unit A WARNING Before installation or se
4. 154 41 0 3 146 78 0 246 0 3 IN LIQUID LINE 9 53 111346 LEFT SIDE E SUCTION LINE FRONT 300 0 A92188 aS ae ee ee 3 eae il CD3A CD3B 018 23 13 16 605 0 533 3 14 3 16 CD3A CD3B 042 30 13 16 782 5 533 3 1 533 3 20 5 8 524 5 22 23 1 in 3 1376 005 0 21 3333 Fig 4 Dimensional Drawing 30 13 16 CD3A CD3B 060 mo f HH TOP VIEW CROSS SECTION 2 A88108 A88107 Fig 5 Filler Plate Installation 036 042 and 048 sizes Fig 6 Typical Hanger Rod Suspension PROCEDURE 6 INSTALLING CONDENSATE DRAIN A 3 4 in female pipe connection is provided on each coil Use 7 8 in OD copper or PVC piping to carry the condensate to an open sump or drain Pitch the drain piping downward at a slope of 1 in in 10 ft Tighten nipple the required amount to seal Use pipe dope if needed Install a trap in the condensate piping near the coil casing See Fig 7 Prime the trap with water Check the trap and drain piping for leaks Insulate the piping when located above a living area to avoid condensate drip For applications where the cooling coil is located above the living space or where structural damage may result from condensate overflow or blowoff an additional watertight pan of corrosion resistant metal should be installed beneath the cooling coil to catch any overflow A separate 3 4 in drain must be
5. Installation Start Up and Service Instruction Cased Horizontal CD3A Furnace Coil CD3B A92187 Fig 1 Model CD3A CD3B NOTE Read the entire instruction manual before starting the installation SAFETY CONSIDERATIONS Improper installation adjustment alteration service maintenance or use can cause explosion fire electrical shock or other conditions which may cause personal injury or property damage Consult a qualified installer service agency or your distributor or branch for information or assistance The qualified installer or agency must use factory authorized kits or accessories when modifying this product Refer to the individual instructions packaged with the kits or accessories when installing Follow all safety codes Wear safety glasses and work gloves Use quenching cloth for brazing operations Have fire extinguisher available Read these instructions thoroughly and follow all warnings or cautions attached to the unit Consult local building codes and National Electrical Codes NEC for special requirements It is important to recognize safety information This is the safety alert symbol When you see this symbol on the unit and in instructions or manuals be alert to the potential for personal injury Understand the signal word DANGER WARNING or CAUTION These words are used with the safety alert symbol DANGER identifies the most serious hazards which will
6. result in severe personal injury or death WARNING signifies hazards that could result in personal injury or death CAUTION is used to identify unsafe practices which would result in minor personal injury or product and property damage Z WARNING Before installing or servicing system always turn off main power to system There may be more than one disconnect switch Turn off accessory heater power if applicable Electrical shock can cause personal injury or death INTRODUCTION The CD3A CD3B is a horizontal multi use cased furnace coil designed to directly match our horizontal downfolw furnace and attach without any transitions See Fig 1 With the use of field supplied transition duct these furnace coils can also be applied to a number of other similar horizontal furnaces on the market The CD3A is available in sizes 018 through 060 The unit can be installed on a working platform pad secured to ceiling joists in an attic suspended from hangers on floor joists installed on blocks or pads in the crawl space It is designed to allow airflow in either direction to mate with horizontal right or horizontal left furnace installations See Fig 2 PROCEDURE 1 MOUNTING COIL A Attachment of duct flange components to coil Table 1 list the parts packaged together and placed in the coil carton Remove these items and inventory against the table Form IM CD3A 02 Cancels IM CD3A 01 Printed in U S A 6 92 Catalog No 92 33CD 3A7 AIR AIR
7. rvicing system always turn off main power to system There may be more than one disconnect switch Turn off accessory heater power if applicable Electrical shock can cause personal injury or death Recover remaining refrigerant from tubing and coil through gage port on suction service valve Remove front panel from coil casing Using a backup wrench disconnect refrigerant liquid tube from metering device Carefully using a knife pry off retainer which is the flare end of the metering device Using small wire pull piston from body of refrigerant metering device See Fig 8 When cleaning be careful not to scratch or enlarge opening as this will affect operation Install new or cleaned piston in refrigerant metering device body There is no front or back to piston Install new retainer Part No 300499 201 for 018 through 060 size coils Reconnect refrigerant tube and tighten Z CAUTION Use a backup wrench and do not over tighten as deformation of refrigerant metering device body will occur causing piston to lodge in a partially open or closed position 11 Pressurize tubing and coil then leak check 12 Purge or evacuate tubing and coil as necessary 1992 RESCO P O Box 1667 Indianapolis IN 46206 14054 6 Book Tab 1 3d 4 2d Catalog No 92 33CD 3A7
8. s level for proper condensate drainage 7 Using appropriate fasteners for type of duct being used connect supply air duct to coil PROCEDURE 4 METERING DEVICE INSTALLATION The refrigerant metering device piston shipped with the coil is used for most applications See Table 2 However for reliable full capacity operation the piston specified in the condensing unit Installation Instructions for the combination should be used If your combination is not shown the piston shipped with the coil is correct Order the proper piston from your dealer Table 2 Refrigerant Metering Device MODEL CD3A CD3B PISTON COIL SIZE NUMBER 70 Fo Ed PROCEDURE 5 CONNECTING REFRIGERANT TUBING Always recover refrigerant if field supplied tubing is used or when sweat connections are made If field supplied tubing is used insulate the entire suction tube NOTE Wrap the tubing with a wet rag as close to the rubber grommets as possible before brazing the liquid and suction tubing joints pak ae Le D DUCT OPENING TYPICAL In BOTH ENDS eg ba m m mii 4 H BOTH lol lol ENDS E y B 7 Cc o o i DUCT OPENING TYPICAL El di BOTHENDS ANNET b aH sis 19 1 n 2 H Fa B 444 5 o 5 1 ER 114 AN e JE 610 De mare 2 Vie o I 43 0 520 f r 7 lor L 042 amp 048 UNITS 4 OPTIONAL DUCT OPENING 13 35 6
9. t edge of band with most holes faces inward on casing Use sheet metal screws to install first rear band as shown in Fig 3C then repeat for rear band at other end of coil 7 When coil furnace orientation has been determined use 2 sheet metal screws to install duct angle at discharge end of the coil See Fig 3C and 3D The duct angle with the 2 plates and a rear band form a duct flange at the discharge end of the coil 8 The 036 042 and sizes have a filler plate included in the package to be used when the coil is being coupled with a narrow furnace Attach filler plate between coil flange and furnace as shown See Fig 5 PROCEDURE 2 HORIZONTAL ATTIC INSTALLATION A Constructing work platform to support coil furnace combination 1 Construct working platform using material in platform that will support the weight of an installer or a service person 2 Place working platform in front of discharge end of furnace 3 Secure platform to building joists B Installation of coil 1 Position coil in front of furnace discharge end The flanges on the coil casing plates and rear band should wrap around 3 sides of the furnace and extend over the furnace casing when the coil is moved into position against the discharge end of the furnace See Fig 3D 2 Secure coil and furnace together by driving 8 self tapping screws through coil flanges into furnace casing through holes provided in plates and bands 3 Make sure that coil is level for
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