Carrier 48EZ(N) - A Installation Instructions Manual

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Contents

7InspectionPrior to initial use, and at monthly intervals, all rigging shackles,clevis pins, and straps should be visually inspected for anydamage, evidence of wear, structural deformation, or cracks.Particular attention should be paid to excessive wear at hoisthooking points and load support areas. Materials showing any kindof wear in these areas must not be used and should be discarded.UNIT FALLING HAZARDFailure to follow this warning could result in personalinjury or death.Never stand beneath rigged units or lift over people.! WARNINGPROPERTY DAMAGE HAZARDFailure to follow this warning could result in personalinjury/death or property damage.When straps are taut, the clevis should be a minimum of 36in. (914 mm) above the unit top cover.! WARNINGRigging/Lifting of Unit (See Fig. 5)Lifting holes are provided in base rails as shown in Fig. 2 and 3.1. Leave top shipping skid on the unit for use as a spreader barto prevent the rigging straps from damaging the unit. If theskid is not available, use a spreader bar of sufficient lengthto protect the unit from damage.2. Attach shackles, clevis pins, and straps to the base rails ofthe unit. Be sure materials are rated to hold the weight of theunit (See Fig. 5).3. Attach a clevis of sufficient strength in the middle of thestraps. Adjust the clevis location to ensure unit is lifted levelwith the ground.After the unit is placed on the roof curb or mounting pad, removethe top skid.Step 6 — Connect Condensate DrainNOTE: When installing condensate drain connection be sure tocomply with local codes and restrictions.Model 48EZ--A disposes of condensate water through a 3/4 in.NPT fitting which exits through the compressor access panel (SeeFig. 2 and 3 for location).Condensate water can be drained directly onto the roof in rooftopinstallations (where permitted) or onto a gravel apron in groundlevel installations. Install a field--supplied condensate trap at endof condensate connection to ensure proper drainage. Make sure thatthe outlet of the trap is at least 1 in. (25 mm) lower than thedrain--pan condensate connection to prevent the pan fromoverflowing (See Fig. 6). Prime the trap with water. When using agravel apron, make sure it slopes away from the unit.If the installation requires draining the condensate water awayfrom the unit, install a 2--in. (51 mm) trap at the condensateconnection to ensure proper drainage (See Fig. 6). Make sure thatthe outlet of the trap is at least 1 in. (25 mm) lower than thedrain--pan condensate connection. This prevents the pan fromoverflowing.Prime the trap with water. Connect a drain tube -- using a minimumof 3/4--in. PVC or 3/4--in. copper pipe (all field--supplied) -- at theoutlet end of the 2--in. (51 mm) trap. Do not undersize the tube.Pitch the drain tube downward at a slope of at least 1--in. (25 mm)for every 10 ft (3 m) of horizontal run. Be sure to check the draintube for leaks.TRAPOUTLET1-in. (25 mm) min.2-in. (51 mm) min.A09052Fig. 6 -- Condensate TrapStep 7 — Install Flue HoodThe flue assembly is secured and shipped in the return air duct.Remove duct cover to locate the assembly (See Fig. 8 and 9).NOTE: Dedicated low NOx models MUST be installed inCalifornia Air Quality Management Districts where a Low NOxrule exists.These models meet the California maximum oxides of nitrogen(NOx) emissions requirements of 40 nanograms/joule or less asshipped from the factory.NOTE: Low NOx requirements apply only to natural gasinstallations.CARBON MONOXIDE POISONING HAZARDFailure to follow this warning could result in personalinjury or death.The venting system is designed to ensure proper venting.The flue hood assembly must be installed as indicted in thissection of the unit installation instructions.! WARNINGInstall the flue hood as follows:1. This installation must conform with local building codesand with the National Fuel Gas Code (NFGC) NFPA 54 /ANSI Z223.1, (in Canada, CAN/CGA B149.1, andB149.2) latest revision. Refer to Provincial and localplumbing or wastewater codes and other applicable localcodes.2. Remove flue hood from shipping location (inside the returnsection of the blower compartment--see Fig. 8 & 9). Re-move the return duct cover to locate the flue hood. Placeflue hood assembly over flue panel. Orient screw holes influe hood with holes in the flue panel.3. Secure flue hood to flue panel by inserting a single screw onthe top flange and the bottom flange of the hood.Step 8 — Install Gas PipingThe gas supply pipe enters the unit through the access holeprovided. The gas connection to the unit is made to the 1/2--in.(12.7 mm) FPT gas inlet on the gas valve.Install a gas supply line that runs to the heating section. Refer toTable 2 and the NFGC for gas pipe sizing. Do not use cast--ironpipe. It is recommended that a black iron pipe is used. Check thelocal utility for recommendations concerning existing lines. Sizegas supply piping for 0.5 IN. W.C. maximum pressure drop. Neveruse pipe smaller than the 1/2--in. (12.7 mm) FPT gas inlet on theunit gas valve.For natural gas applications, the gas pressure at unit gas connectionmust not be less than 4.0 IN. W.C. or greater than 13 IN. W.C.while the unit is operating. For propane applications, the gaspressure must not be less than 11.0 IN. W.C. or greater than 13 IN.W.C. at the unit connection.48EZ -- A