Carrier WEATHERMAKER 48AJ Installation Instructions Manual

Also see for 48AJ: Installation, Start-Up and Service Instructions Operation and service guide Started guide Operating and service guide

Contents

19Step 5 — Install Flue Hood48AJ,AK,AW,AY020-050 UNITS — Flue hood is shippedinside gas section of unit. To install, secure flue hood to accesspanel. See Fig. 14.48AJ,AK,AW,AY051 AND 060 UNITS — Flue hood andwind baffle are shipped inside gas section of unit. To install, se-cure flue hood to access panel. Install the two pieces of thewind baffle over the flue hood. See Fig. 15.NOTE: When properly installed, flue hood will line up withcombustion fan housing. See Fig. 16.Step 6 — Trap Condensate Drain — See Fig. 4-9for drain location. Condensate drain is open to atmosphere andmust be trapped. Install a trapped drain at the drain location.One 1-in. FPT coupling is provided inside the unit evaporatorsection for condensate drain connection. A trap at least 4-in.deep must be used. See Fig. 17. Trap must be installed to pre-vent freeze-up.Condensate pans are sloped so that water will completelydrain from the condensate pan to comply with indoor air quali-ty guidelines. The condensate drain pans are not insulated.Step 7 — Install Gas Piping — Unit is equipped foruse with natural gas. Installation must conform with localbuilding codes or, in the absence of local codes, with the Na-tional Fuel Gas Code, ANSI Z223.1.Install manual gas shutoff valve with a 1/8-in. NPT pressuretap for test gage connection at unit. Field gas piping must in-clude sediment trap and union. See Fig. 18. An 1/8-in. NPT isalso located on the gas manifold adjacent to the gas valve.WARNINGDo not pressure test gas supply while connected to unit.Always disconnect union before servicing. Serious injurycould result.FLUE HOODGAS SECTIONACCESS PANELWINDBAFFLETOP VIEW SIDE VIEWFig. 14 — Flue Hood Location(48AJ,AK,AW,AY020-050 Units)Fig. 15 — Flue Hood Location(48AJ,AK,AW,AY051 and 060 Units)a48-3712a48-4076Fig. 16 — Combustion Fan Housing Location(48AJ,AK,AW,AY020-050 Shown)a48-3823Fig. 17 — Condensate Drain Trap Piping Details(Typical Roof Curb or Slab Mount Shown)a48-3714