Carrier 48DU Instruction Manual Page 1

Installation InstructionsThis kit is used on:Two-Stage (2 - 5 Tons) Models: 48DU, 48DT, 48XL, 48XT,577B, 577D, 677B, and 677D. (Two-Stage conversion s

This normally open switch closes when gas is supplied to gas valveunder normal operating pressure. The dosed switch completescontrol circuit. Should a

Table 6 - Single-Stage Sequence of OperationsTrial-for-Ignition Sequence: The ignition sequence is to immediately energize the inducer motor on a call

BURNERFLAME(Blueinappearance)BURNERMANIFOLDFig. 14 - Monoport BurnerJ :////A07805Single-Stage 90,000 BTUH to130,000 BTUH UnitsSingle-Stage 40,000 BTUH

Rollout SwitchFig. 16 - Single-Stage Burner BracketBurner BracketA0787413

LOW GAS PRESSURE SWITCH\1/8 NPTx 2 NIPPLESINGLE-STAGE GAS VALVEELBOW1/8 NPTx 3/4 CLOSE PiPE NIPPLE1/8 NPTx 3/4 CLOSE PIPE NIPPLEFig. 17 - Installing E

TableI - Two-Stage Kit ContentsITEMInstallation InstructionsPropane Gas Orifice #50*Propane Gas Orifice #51 *Propane Gas Orifice #52*Propane Gas Orifi

Replacetheburnersintherackusingthesavedscrews,makingsureclosedcrossoversofburnersareateachend.13.Removethenaturalgasorificesfromthemanifoldusinga9/16i

Table 2 - Two-Stage Sequence of OperationsInducer Pre-Purge Period: When the inducer motor comes up on high speed, the pressure switch closes, and the

IMPORTANT: Restart unit and leak check all gas connectionsincluding the main service connection, gas valve, gas spuds, andmanifold pipe plug.FIRE AND

FLAMESENSORBURNER (3)MANIFOLDORIFICE (3)TWO-STAGE90,000 BTUHTO 130,000 BTUH UNITSFLAMESENSORORIFICE (3)BURNER INSERT (3)_ SPARKER"__- - GASVALVE.

Table 4 - Propane Gas Orifice Sizes and Manifold Pressures (IN. W.C.)PROPANE CONVERSION KiT RATING PLATE CARRIER CORP.TH S APPL ANCE HAS BEEN CONVERTE

TWO -STAGE GAS VALVE1/8 NPTx 3/4 CLOSE PIPE NIPPLE1/8 NPTx 3/4 CLOSE PIPE NIPPLE1/8 ELBOW1/8 ELBOW1/8 NPTx2 NIPPLELOW GAS PRESSURE SWITCHFig. 9 - Inst

SINGLE-STAGE KIT INTRODUCTIONThese instructions cover the installation of a propane gasconversion kit on models 48ES, 48EZ, 48VL, 48VT, 574D, 577C,674