Carrier 58MTB Operations Instructions

58MTBDeluxe 4–Way Multipoise 2-StageCondensing Gas FurnaceInstallation, Start-up, and Operating InstructionsSizes 060-120, Series 100NOTE: Read the en

b. Remove and discard UPPER (molded) inducer housingdrain tube which was previously connected to condensatetrap.c. Install cap and clamp on UPPER indu

d. Clamp tube to prevent any condensate leakage.3. Relief Port Tubea. Extend collector box tube (green label) which was previ-ously connected to the c

MINOR PROPERTY DAMAGEFailure to follow this caution may result in minor propertydamage.Local codes may require a drain pan under entire furnace andcon

d. Clamp tube to prevent any condensate leakage.2. Inducer Housing Drain Tube:a. Remove factory-installed cap and clamp from LOWERinducer housing drai

UNIT MAY NOT OPERATEFailure to follow this caution may result in intermittent unitoperation.The condensate trap MUST be installed below furnace. SeeFi

UNIT DAMAGE HAZARDThis gas furnace may be used for construction heat providedthat:-The furnace is permanently installed with all electricalwiring, pip

NON-DIRECT VENT (1-PIPE) APPLICATIONUNIT DAMAGE HAZARDFailure to follow this caution may result in intermittent unitoperation.Do not install furnace i

b. Not less than the sum of the areas of all vent connectors inthe space.The opening shall commence within 12″ (300 mm) of theceiling. Appliances in t

If:Iother= combined input of all other than fan-assisted appli-ances in Btu/hrIfan= combined input of all fan-assisted appliances in Btu/hrACH = air c

Combination of Indoor and Outdoor Air1. Indoor openings shall compy with the Indoor CombustionAir Method below and,2. Outdoor openings shall be locate

SAFETY CONSIDERATIONSFURNACE RELIABILITY HAZARDImproper installation or misapplication of furnace may re-quire excessive servicing or cause premature

Table 3—Opening Dimensions (In.)FURNACECASINGWIDTHAPPLICATIONPLENUM OPENING FLOOR OPENINGABCD17-1/2Upflow Applications 16 24-1/8 16-5/8 24-3/4Downflow

furnace, the return air must also be handled by a duct(s) sealed tothe furnace casing and terminating outside the space containing thefurnace.Secure d

The air filter arrangement will vary due to application, furnaceorientation, and filter type. The filter may be installed in anexternal Filter/Media c

CUT HAZARDFailure to follow this caution may result in minor personalinjury.Use care when cutting support rods in filters to protect againstflying pie

Step 7—Gas PipingGas piping must be installed in accordance with national and localcodes. Refer to current edition of NFGC in the United States.Canadi

Step 8—Electrical ConnectionsSee Fig. 31, 32, and 50A-H for field wiring diagram showingtypical field 115-v and 24-v wiring. Check all factory and fie

Fig. 31—Typical Heating and Cooling Application Wiring Diagram 1-Stage Thermostat and Condensing UnitA99071115-V FUSEDDISCONNECTSWITCH(WHEN REQUIRED)

Use a separate, fused branch electrical circuit containing a properlysized fuse or circuit breaker for this furnace. See Table 6 for wiresize and fuse

Step 9—Removal of Existing Furnaces fromCommon Vent SystemsWhen an existing Category I furnace is removed or replaced, theoriginal venting system may

Fig. 36—Wiring DiagramA02176GVHIMGRN/YELCNOTE #3BRNBLUBRNGRN/YELREDREDFRSLSNOTE #11ORNYELHSIL1NOTE #2GNDNEUTRALFU2FUSE OR CIRCUITBREAKER & DISCONN

Install this furnace only in a location and position as specified inLOCATION and INSTALLATION sections of these instructions.Always provide adequate c

FIRE AND EXPLOSION HAZARDFailure to follow this warning could result in fire, propertydamage, personal injury, or death.Solvent cements are combustibl

UNIT CORROSION HAZARDExcessive exposure to contaminated combustion air mayresult in safety and performance related problems.Combustion air must not be

Table 8—Direct Vent Termination ClearanceA0500932

→ Table 9—Other than Direct Vent Termination ClearanceA0501333

Attachment of Combustion Air Pipe1. Determine location of combustion air intake pipe connectionto combustion air intake housing as shown in Fig. 38 fo

NOTE: (Direct Vent/2-Pipe ONLY) vent pipe system has thesame diameter and same length as combustion air pipe as men-tioned in section ″Assembly of Com

UNIT DAMAGE HAZARDFailure to follow this caution may result in unit componentdamage.Vent pipe must be installed and fully seated against inducerhousin

5. Clean and dry all surfaces to be joined.6. Check dry fit of pipe and mark insertion depth on pipe.7. After pipes have been cut and preassembled, ap

TABLE 12—MAXIMUM ALLOWABLE PIPE LENGTH (FT) (Continued)ALTITUDE (FT)UNIT SIZE(BTUH)DIRECT VENT (2-PIPE) ONLYNON-DIRECT VENT(1-PIPE) ONLYNUMBER OF 90°

EXAMPLE:An 080-12 size furnace located in Indianapolis, elevation650 ft above sea level, could be installed as either a directvent/2-pipe system that

Fig. 2—Dimensional DrawingDIMENSIONS (IN.)UNIT SIZE A D E060-12 17-1/2 15-7/8 16080-12 17-1/2 15-7/8 16080-16 17-1/2 15-7/8 16100-16 21 19-3/8 19-1/21

Vent/2-Pipe system and Table 9 for Non-direct Vent/1-Pipesystem. For exterior piping arrangements, refer to Fig. 44 forDirect Vent/2-Pipe system and F

Fig. 44—Combustion Air and Vent Pipe Terminationfor Direct Vent (2-pipe) System (All Sizes)A05090At least 36 in.18 in. maximumVertical separationbetwe

Combustion air and vent pipes MUST terminate outside structure.A factory accessory termination kit must be installed as shown inTable 13. There are fo

PERSONAL INJURY HAZARDCaution should be taken to prevent draining where slipperyconditions may cause personal injuries.Excessive condensate draining m

FIRE HAZARDFailure to follow this caution may result in intermittent unitoperation or performance satisfaction.This furnace is equipped with a manual

TWO-STAGE HEATING WITH SINGLE-STAGETHERMOSTAT (ADAPTIVE MODE)(See Fig. 31 for thermostat connections.)NOTE: Low-heat-only switch, SW-1, selects either

the high-heat gas valve solenoid GV-HI is energized. Theblower motor BLWM will switch to HI HEAT speed fiveseconds after the R to W2 circuit closes.2.

A00275Fig. 50A—Two-Stage Furnace with Single-Speed AirConditionerFig. 50B—Two-Stage Furnace with Two-Speed AirConditionerA00276A00277Fig. 50C—Two-Stag

A00279Fig. 50E—Dual Fuel Thermostat with Two-StageFurnace and Single-Speed Heat PumpA00281Fig. 50G—Two-Stage Thermostat With Two-StageFurnace and Two-

Notes for Fig. 50A-H:1. Heat pump MUST have a high pressure switch for dual fuel applications.2. Refer to outdoor equipment Installation Instructions

Step 3—Combustion and Ventilation Air• US: Section 8.3 of the NFGC, Air for Combustion andVentilation• CANADA: Part 7 of the NSCNGPIC, Venting Systems

b. When the R to G-and Y/Y2 circuit is closed and there is ademand for dehumidification, the furnace blower motorBLWM will drop the blower speed from

6. Operate furnace per instruction on outer door.7. Verify furnace shut down by lowering thermostat settingbelow room temperature.8. Verify that furna

Table 14—Model 58MTB Orifice Size and High/Low-Heat Manifold Pressures for Correct Inputsfor Use with 060 Through 120 Size Furnaces Only(Tabulated Dat

Table 14—Model 58MTB Orifice Size and High/Low-Heat Manifold Pressures for Correct Inputs (Continued)for Use With 060 Through 120 Size Furnaces Only(T

Table 14—Model 58MTB Orifice Size and High/Low-Heat Manifold Pressures for Correct Inputs (Continued)for Use With 060 Through 120 Size Furnaces Only(T

3. Verify Natural Gas Input Rate By Clocking Gas Meter.NOTE: Be sure all pressure tubing, combustion-air and ventpipes, and burner enclosure front are

SET TEMPERATURE RISEUNIT DAMAGE HAZARDFailure to follow this caution may result in overheating theheat exchangers or condensing flue gases in heat exc

For low-heat, the following connections can be made at LO-HEAT on control:a. Med (Orange) -Available only on 5-speed motorsb. Med-Low (Blue)c. Low (RE

CHECKLIST1. Put away tools and instruments. Clean up debris.2. Check SW-1 through SW-3 after completing installation toensure desired settings for the

CHECKLIST—DIRECT VENT (2-PIPE) INSTALLATIONLOAD CALCULATION____________ Heating Load (Btuh)____________ Cooling Load (Btuh)____________ Furnace Model

ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONSPROCEDUREUNIT DAMAGE HAZARDFailure to follow this caution may result in damage to unitcomponents.Electrostati

CHECKLIST—NON DIRECT VENT (1-PIPE) INSTALLATIONLOAD CALCULATION____________ Heating Load (Btuh)____________ Cooling Load (Btuh)____________ Furnace Mo

NOTE: Failure to use CPVC elbows may allow drain to kink andprevent draining.f. Connect larger diameter drain tube and clamp (factory-supplied in loos

2. Inducer Housing Drain Tubea. Remove and discard LOWER (molded) inducer housingdrain tube which was previously connected to condensatetrap.b. Use in

To relocate condensate trap from the blower shelf to desiredlocation, perform the following:1. Remove 3 tubes connected to condensate trap.2. Remove t