Carrier 58MTB Installation, Start-up, And Operating Instructions Manual

Also see for 58MTB: User's information manual Owner's manual Service and maintenance instructions

Combustion air and vent pipes MUST terminate outside structure.A factory accessory termination kit must be installed as shown inTable 13. There are four options of vent/combustion air termina-tion kits available as shown in Table 13.NOTE: Combustion air pipe must have the same diameter as ventpipe.Concentric Vent/Combustion Air Termination Kit (Direct Vent/2-Pipe System Only)Determine an appropriate location for termination kit using theguidelines provided in section ″Vent Termination: General″ in thisinstruction.1. Cut one 4-in. diameter hole for 2-in. kit, or one 5-in. diameterhole for 3-in. kit.2. Loosely assemble concentric vent/combustion air terminationcomponents together using instructions in kit.3. Slide assembled kit with rain shield REMOVED through hole.NOTE: Do not allow insulation or other materials to accumulateinside of pipe assembly when installing it through hole.Roof terminations—Locate assembly through roof to appro-priate height as shown in Fig. 44.Sidewall terminations—Locate assembly through sidewallwith rain shield positioned no more than 1-in. from wall asshown in Fig. 44.4. Disassemble loose pipe fittings. Clean and cement using sameprocedures as used for system piping.5. Check required dimensions as shown in Fig. 44.Two-Pipe Termination Kit (Direct Vent/2-Pipe System Only)Determine an appropriate location for termination kit using theguidelines provided in section ″Vent Termination: General″ in thisinstruction.1. Cut 2 holes, 1 for each pipe, of appropriate size for pipe sizebeing used.2. Loosely install elbow in bracket and place assembly oncombustion-air pipe.Roof terminations—Loosely install pipe coupling on prop-erly cut vent pipe. Coupling must be positioned so bracket willmount as shown in Fig. 44.For applications using combustion-air pipe option, indicatedby dashed lines in Fig. 44, install 90° street elbow into 90°elbow, making a U-fitting. A 180° U-fitting may be used.Sidewall terminations—Install bracket as shown in Fig. 44.For applications using vent pipe option indicated by dashedlines in Fig. 44, rotate vent elbow 90° from position shown inFig. 44.3. Disassemble loose pipe fittings. Clean and cement using sameprocedures as used for system piping.4. Check required dimensions as shown in Fig. 44.Multiventing and Vent TerminationsWhen 2 or more 58MTB Furnaces are vented near each other, eachfurnace must be individually vented. NEVER common vent orbreach vent 58MTB furnaces.(Direct Vent/2-Pipe System ONLY)-When 2 or more 58MTBfurnaces are vented near each other, 2 vent terminations may beinstalled as shown in Fig. 44, but next vent termination must be atleast 36 in. away from first 2 terminations. It is important that ventterminations be made as shown in Fig. 44 to avoid recirculation offlue gases.Step 11—Condensate DrainUNIT MAY NOT OPERATEFailure to follow this caution may result in intermittent unitoperation.Unit must not be installed, operated, and then turned off andleft in an unoccupied structure during cold weather whentemperature drops to 32°F and below unless drain trap anddrain line have adequate freeze protection. See Service andMaintenance Instructions for winterizing procedure.GENERALCondensate trap is shipped installed in the blower shelf and factoryconnected for UPFLOW applications. Condensate trap must beRELOCATED for use in DOWNFLOW and HORIZONTALapplications.Condensate trap MUST be used for all applications.An external trap is not required when connecting the field drain tothis condensate trap.The field drain connection (condensate trap or drain tube coupling)is sized for l/2-in. CPVC, 1/2-in. PVC, or 5/8-in. ID tubeconnection.Drain pipe and fittings must conform to ANSI standards andASTM D1785, D2466 or D2846. CPVC or PVC cement mustconform to ASTM D2564 or F493. Primer must conform to ASTMF656. In Canada, use CSA or ULC listed schedule 40 CPVC orPVC drain pipe, fittings, and cement.When a condensate pump is required, select a pump which isapproved for condensing furnace applications. To avoid conden-sate spillage, select a pump with an overflow switch.Furnace condensate is mildly acidic, typically in the pH range of3.2 to 4.5. Due to corrosive nature of this condensate, a condensatepH neutralizing filter may be desired. Check with local authoritiesto determine if a pH neutralizer is required.APPLICATIONThe furnace, A/C, and humidifier drains may be combined anddrained together. The A/C drain must have an external, field-supplied trap prior to the furnace drain connection. All drainconnections (furnace, A/C, or humidifier) must be terminated intoan open or vented drain as close to the respective equipment aspossible to prevent siphoning of the equipment’s drain.See Fig. 46 for example of possible field drain attachment using1/2-in. CPVC or PVC tee for vent and A/C or humidifier drainconnection.Outdoor draining of the furnace is permissible if allowed by localcodes. Caution should be taken when freezing. Ambient mayfreeze drain pipe and prohibit draining.Table 13—Vent Termination Kit for Direct Vent/2-Pipe SystemDIRECT VENT (2-PIPE) TERMINATION KIT TERMINATION SYSTEM DIAM. OF COMBUSTION AIR AND VENTPIPES (IN INCHES)2-in. Concentric Vent Kit Single Penetration of Wall or Roof 1, 1-1/2, 2, or 2-1/23-in. Concentric Vent Kit Single Penetration of Wall or Roof 2-1/2, 3 or 42-in. Termination Bracket Kit 2-Pipe Termination System 1, 1-1/2 or 23-in. Termination Bracket Kit 2-Pipe Termination System 2-1/2, 3 or 442→