Carrier 28GH User's Manual
Contents
1. Carrier Direct Expansion Evaporator Coil GENERAL These encased coils must be used in a hori zontal position with the air flow in the direction as indicated in Fig 1 Transportation Damage If any damage is noted when unpacking coil file a claim with the trans portation agency PRIMARY ORAIN CONN A NPT X is LG NIPPLE AUXILIARY CONDENSATE CONN 28GHO02 003 L KRZ om F PRIMARY ORAIN CONN i if 005 006 3 NPT X 15 LG SERVICE AND PES NIPPLE AUXILIARY ACCESS SPACE CONDENSATE CONN UNIT 283GR 002 004 005 003 1I i 20 Lih j 3 0 DIM ft in g BY CONN in ODF i o eee Suction D E E AE EET m Liquid So 7 Condensate F Pe 7 A G i 18 Paet imeto y i 24 18 22 i 26 i 34 T 18 Duct Ootlettia oo rere ae as Ki 14 i 18 22 26 34 Fig 1 Dimensions Carrier Corporation 1969 INSTALLATION Install coil in the horizontal run of a supply air duct from any furnace Fig 2 shows typical installations Attach ductwork to encased coil Use straps for hanging Do not drill or screw into coil condensate pan Coil must be level for proper condensate drainage If the duct cross sectional area between coil and furnace is smaller than entering air opening of encased coil a transition must be made in the duct The ratio of transition in the duct must not exceed more than one inch for every s2. LOCKING RATCHET TEETH SMALL TABS LOCKING TONGUE CLAMP IN LOCKING POSITION Fig 3 Hose Clamp 3 Grip adjacent bridges with pliers and compress to tight position Pliers can be held parallel to hose where space is limited 4 To remove lift the locking tongue with screwdriver Protective Plastic Film Pee from unit panels when installation is complete AIR QUANTITY To prevent moisture blowoff do not exceed cfm shown in Table 1 Table 1 Maximum Allowable CFM for 28GH Coil COIL 28GH 002 003 004 oos 006 oe 1580 A 1920 2560 EBSON cos GSE ae cs g Nive WUE RE i _ aie Os i Horizontal Manufacturer reserves the right to change any product specifications without notice CARRIER AIR CONDITIONING COMPANY Tab 7 Form 28GH 1S New Printed in U S A SYRACUSE NEW YORK 6 69 Codes D and MS Catalog No 532 841
3. even in both the horizontal and vertical planes Where it is necessary to reduce fan noise or vibration install a canvas connection in the duct work on the entering air side of the coil When encased coil is installed in a crawl space attic or basement with less than 18 in service clearance above the unit it is not possible to service unit thru the access panel In these cases part of the ductwork must be cut away or unit must be removed from duct for servicing DROP DUCT ACCESSORY 58BV FURNACE UPFLOW Fig 2 Typical Installation Refrigerant Piping Connection sizes are given in Fig 1 COILS 002 THRU 005 use Carrier Compatible Fittings and accessory tubing package for connec tions Detailed instructions are included with the tubing package Do not remove rubber plugs from Carrier Compatible Fittings on the coil until ready to connect the suction or liquid line into the fitting If coil piping is left open vapor holding charge will escape and allow moisture to enter Form 28GH 1SI w Ge ate COIL 006 must have the liquid and suction lines soldered to the unit Refrigerant Control is a factory installed thermal expansion valve For proper operation locate the feeler bulb outside the encased coil about 45 degrees above the horizontal center line of the suction line Do not mount bulb such that capillary tube extends from bottom of bulb Clean suction line for good contact with bulb Secure b
4. ulb tightly to suction line with metal straps provided If this is not done liquid may slug to the compressor Suction Line Insulation Insulate entire suction line Tubing package has an insulated suction line Insulate suction line from encased coil to and surrounding expansion valve feeler bulb on 28GH Coils Refrigerant Charge Coils 002 thru 005 have vapor holding charge Do not evacuate if accessory tubing package with Carrier Compatible Fittings is used If sweat connections are used purge or evacuate coil and piping Coil 006 is shipped without charge Purge or evacuate coil and piping Refer to Standard Service Techniques Manual Chapter 1 pages 1 8 thru 1 14 and condensing unit and or tubing package instructions for details Condensate Drain 1 Connect the rubber elbow furnished with unit to the primary drain See Fig 1 2 Connect 7 8 in copper tube to the elbow 3 Form a trap in the 7 8 in copper tube and run the tubing to an open drain Drain tube should be pitched at least 1 in per 10 ft 4 Run individual condensate lines to the primary and secondary drain pans The condensate line should discharge at a point where it can be readily observed if a correction is needed HOW TO APPLY HOSE CLAMPS 1 Pull ends apart Fig 3 2 Wrap around hose with toothed end beneath Prelatch by compressing until last ratchet teeth catch behind small tabs uo ww LOCKING TONGUE STARTING POSITION FOR
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