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Carrier 58MTA Installation, Start-Up, And Operating Instructions Manual

Sizes 060-120, series 120 deluxe 4–way multipoise 2-stage direct vent condensing gas furnace
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Installation, Start-up, and Operating Instructions
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TABLE OF CONTENTS

SAFETY CONSIDERATIONS .....................................................2
INTRODUCTION ..........................................................................2
CODES AND STANDARDS........................................................3
Safety.........................................................................................3
General Installation...................................................................3
Combustion and Ventilation Air ..............................................3
Duct Systems ............................................................................5
Acoustical Lining and Fibrous Glass Duct..............................5
Gas Piping and Gas Pipe Pressure Testing..............................5
Electrical Connections ..............................................................5
APPLICATIONS............................................................................6
General ......................................................................................6
Upflow Applications.................................................................6
Orientation) ..........................................................................6
Orientation) ..........................................................................6
Orientation) ..........................................................................7
Orientation) ..........................................................................7
Condensate Trap Field Drain Attachment ..........................8
Pressure Switch Tubing.......................................................8
Drain Connections ...............................................................8
Condensate Trap Freeze Protection ....................................8
Downflow Applications ............................................................8
Condensate Trap Location ..................................................8
Condensate Trap Tubing .....................................................9
Condensate Trap Field Drain Attachment ........................10
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
PC 101
Catalog No. 535-80129
Tab 6a 8a
Direct Vent Condensing Gas Furnace
Sizes 060-120, Series 120
A93040
Printed in U.S.A.
Deluxe 4-Way Multipoise 2-Stage
Pressure Switch Tubing.....................................................10
Condensate Trap Freeze Protection ..................................10
Condensate Trap Location ................................................10
Condensate Trap Tubing ...................................................10
Pressure Switch Tubing.....................................................10
Condensate Trap Freeze Protection ..................................11
Construct a Working Platform ..........................................11
Condensate Trap Location ................................................11
Condensate Trap Tubing ...................................................13
Condensate Trap Field Drain Attachment ........................13
Pressure Switch Tubing.....................................................13
Condensate Trap Freeze Protection ..................................13
Construct a Working Platform ..........................................13
LOCATION..................................................................................13
General ....................................................................................13
Equipment ...............................................................................14
Hazardous Locations...............................................................15
INSTALLATION .........................................................................15
Leveling Legs (If Desired) .....................................................15
Applications ............................................................................15
Installation in Horizontal Applications ..................................17
Air Ducts.................................................................................17
General Requirements .......................................................17
Ductwork Acoustical Treatment .......................................17
Supply Air Connections ....................................................17
Return Air Connections.....................................................17
Filter Arrangement..................................................................18
Bottom Closure Panel.............................................................19
Gas Piping...............................................................................20
Electrical Connections ............................................................20
115-V Wiring.....................................................................22
24-V Wiring.......................................................................23
Accessories ........................................................................23
Direct Venting.........................................................................23
Systems ..............................................................................23
Combustion-Air and Vent Piping .....................................25
Kit Installation ...................................................................30
Multiventing and Vent Terminations................................33
Condensate Drain....................................................................33
General...............................................................................33
Application.........................................................................34
Condensation Drain Protection .........................................34
General ....................................................................................34
Prime Condensate Trap With Water ......................................37
Purge Gas Lines......................................................................37
Form 58MTA-7SI
58MTA
Pg 1
5-04
Replaces: 58MTA-6SI

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  • Page 1: Table Of Contents

    Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 1 4 PC 101 Catalog No. 535–80129 Printed in U.S.A. Form 58MTA-7SI Pg 1 5-04 Replaces: 58MTA-6SI Tab 6a 8a...

  • Page 2: Safety Considerations

    The qualified The model 58MTA, 2-Stage, 4-way multipoise, Gas-Fired, Cat- installer or agency must use only factory-authorized and egory IV, direct vent condensing furnace is available in model listed kits or accessories when modifying this product.

  • Page 3: Codes And Standards

    Service and Maintenance Instructions manufacturer’s coil assembly or when the manufacturer’s coil box User’s Information Manual is used. The design of the 58MTA furnace is not C.S.A. (formerly Warranty Certificate AGA and CGA) certified for installation in mobile homes, Loose Parts Bag includes: Quantity recreational vehicles, or outdoors.

  • Page 5: Duct Systems

    INSTALLATION This forced air furnace is equipped for use with natural gas at altitudes 0 - 10,000 ft (0 - 3,050m), except 140 size furnaces are only approved for altitudes 0 - 7,000 ft. (0 - 2,135m). An accessory kit, supplied by the manufacturer, shall be used to convert to propane gas use or may be required for some natural gas applications. This furnace is for indoor installation in a building constructed on site.

  • Page 6: Applications

    APPLICATIONS MINOR PROPERTY DAMAGE Failure to follow this caution may result in minor property damage. Local codes may require a drain pan under entire furnace and condensate trap when a condensing furnace is used in an attic application or over a finished ceiling. NOTE: In Canada, installations shall be in accordance with current NSCNGPIC and/or local codes.

  • Page 7: Condensate Trap Location (Alternate Upflow Orientation)

    FURNACE BLOWER SHELF CONDENSATE DOOR TRAP FURNACE CONDENSATE DOOR FURNACE TRAP (INSIDE) FURNACE SIDE SIDE FIELD FIELD DRAIN DRAIN CONN CONN ALTERNATE DRAIN TUBE LOCATION SIDE VIEW FRONT VIEW END VIEW FRONT VIEW CONDENSATE TRAP DRAIN TUBE LOCATION HORIZONTAL DOWNFLOW AND ALTERNATE UPFLOW APPLICATIONS APPLICATIONS EXTERNAL UPFLOW APPLICATIONS...

  • Page 8: Condensate Trap Field Drain Attachment

    PLUG PLUG COLLECTOR BOX COLLECTOR BOX DRAIN TUBE (BLUE DRAIN TUBE (BLUE & WHITE STRIPED) & WHITE STRIPED) COLLECTOR BOX COLLECTOR BOX TUBE (PINK) TUBE (PINK) COLLECTOR BOX COLLECTOR BOX TUBE (GREEN) TUBE (GREEN) COLLECTOR BOX DRAIN TUBE (BLUE) INDUCER HOUSING (MOLDED) DRAIN TUBE (BEHIND COLLECTOR BOX...

  • Page 9: Condensate Trap Tubing

    4. Install casing hole filler cap into blower shelf hole where trap COLLECTOR BOX was removed. DRAIN TUBE (BLUE) PLUG FIRE, INJURY, OR DEATH HAZARD Failure to follow this warning could result in electrical shock, fire, personal injury or death. COLLECTOR BOX TUBE (GREEN) Casing hole filler cap must be installed in blower shelf hole...

  • Page 10: Condensate Trap Field Drain Attachment

    (a.) Determine appropriate length and cut. 2. Remove trap from blower shelf by gently pushing tabs inward and rotating trap. (b.) Connect tube to condensate trap. 3. Install casing hole filler cap (factory-supplied in loose parts (c.) Clamp tube to prevent any condensate leakage. bag) into blower shelf hole where trap was removed.

  • Page 11: Condensate Trap Freeze Protection

    PLUG COLLECTOR BOX AUXILIARY "J" BOX DRAIN TUBE (BLUE AND WHITE STRIPED) CONDENSATE COLLECTOR BOX TRAP TUBE (GREEN) INDUCER HOUSING COLLECTOR DRAIN TUBE (VIOLET) BOX EXTENSION COLLECTOR BOX DRAIN TUBE DRAIN TUBE (BLUE) COLLECTOR BOX EXTENSION TUBE DRAIN TUBE COUPLING COLLECTOR BOX TUBE (PINK) RELOCATE TUBE BETWEEN BLOWER SHELF AND INDUCER HOUSING FOR 040, 060, AND 080 HEATING INPUT FURNACES...
  • Page 12 COMBUSTION – AIR INTAKE VENT A 12-IN. MIN HORIZONTAL PIPE SECTION IS RECOMMENDED WITH SHORT (5 TO 8 FT) VENT SYSTEMS TO REDUCE EXCESSIVE CONDENSATE DROPLETS FROM ″ EXITING THE VENT PIPE. WORK AREA ″ ⁄ MANUAL SHUTOFF ACCESS OPENING GAS VALVE FOR TRAP DRAIN...

  • Page 13: Condensate Trap Tubing

    3. Install casing hole filler cap (factory-supplied in loose parts 1. Disconnect collector box pressure tube (pink label) attached to bag) into blower shelf hole where trap was removed. High Pressure Switch. 2. Extend collector box pressure tube (green label) which was previously connected to condensate trap relief port connection by splicing to small diameter tube (factory-supplied in loose FIRE, INJURY, OR DEATH HAZARD...

  • Page 14: Furnace Location Relative To Cooling Equipment

    FRONT LEVEL (0″) FRONT FRONT ⁄ ″ ⁄ ″ MAX ⁄ ″ MAX UPFLOW OR DOWNFLOW HORIZONTAL A02146 BACK Fig. 13—Proper Condensate Drainage When a furnace is installed so that supply ducts carry air circulated FRONT by the furnace to areas outside the space containing the furnace, A93043 return air must also be handled by ducts sealed to furnace casing.

  • Page 15: Hazardous Locations

    Step 3—Hazardous Locations ″ ⁄ ″ ⁄ ″ ⁄ ″ ⁄ ″ ⁄ 18-IN. MINIMUM TO BURNERS A93044 ″ ⁄ ″ Fig. 16—Installation in a Garage ⁄ ″ ⁄ A89014 → FIRE, EXPLOSION, INJURY OR DEATH HAZARD Fig. 17—Leveling Legs Improper location or inadequate protection could result in fire or explosion.
  • Page 16 TABLE 1—OPENING DIMENSIONS (IN.) FURNACE PLENUM OPENING FLOOR OPENING CASING APPLICATION WIDTH Upflow Applications 24–1/8 16–5/8 24–3/4 Downflow Applications on Non-Combustible Flooring 15-7/8 16-1/2 19-5/8 Downflow Applications on Combustible Flooring Using KGASB Subbase 15-1/8 16-3/4 20-3/8 Furnace with or without CD5 or CK5 Coil Assembly or 17-1/2 KCAKC Coil Box Downflow Applications on Combustible Flooring NOT Using...

  • Page 17: Installation In Horizontal Applications

    When a furnace is installed so that the supply ducts carry air circulated by the furnace to areas outside the space containing the PERFORATED DISCHARGE DUCT furnace, the return air must also be handled by a duct(s) sealed to FLANGE the furnace casing and terminating outside the space containing the furnace.

  • Page 18: Filter Arrangement

    ⁄ -IN. ROD ANGLE ″ ⁄ IRON OR EQUIVALENT ALTERNATE SUPPORT LOCATION 4-IN. MIN 8-IN. MAX DRAIN (A) ROD LOCATION USING DIMPLE LOCATORS -IN. MAX -IN. HEX NUT (SEE DIMENSIONAL ALTERNATE SUPPORT DWG FOR & WASHER (4) LOCATION FROM BACK REQD PER ROD LOCATIONS) NOTES:...

  • Page 19: Bottom Closure Panel

    ⁄ -IN. WIDE Table 2—FILTER INFORMATION CASINGS ONLY: INSTALL FIELD-SUPPLIED AIR FILTER LOCATED IN BLOWER COMPARTMENT FILTER FILLER STRIP UNDER FILTER. FURNACE FILTER SIZE (IN.)* FILTER CASING TYPE Side Return Bottom Return WIDTH (IN.) 3 ″ 17-1/2 (1) 16 X 25 X 1† (1) 16 X 25 X 1†...

  • Page 20: Gas Piping

    Step 7—Gas Piping Gas piping must be installed in accordance with national and local SUPPLY codes. Refer to current edition of NFGC in the United States. MANUAL SHUTOFF Canadian installations must be made in accordance with NSCNG- VALVE PIC and all authorities having jurisdiction. (REQUIRED) Gas supply line should be a separate line running directly from SEDIMENT...
  • Page 21 FIELD 24-V WIRING FIELD 115-, 208/230-, 460-V WIRING FACTORY 24-V WIRING FACTORY 115-V WIRING 1-STAGE THERMOSTAT TERMINALS FIVE FIELD-SUPPLIED WIRE FUSED DISCONNECT TWO-WIRE 208/230- OR HEATING- 460-V ONLY THREE PHASE 208/230-V W/W1 SINGLE PHASE Y/Y2 115-V FUSED JUNCTION DISCONNECT SWITCH CONTROL CONDENSING (WHEN REQUIRED)

  • Page 22: 115-V Wiring

    Table 5—APPROVED COMBUSTION-AIR AND VENT PIPE, FITTING AND CEMENT MATERIALS ASTM SPECIFICATION MATERIAL PIPE FITTINGS SOLVENT CEMENT AND PRIMERS DESCRIPTION (MARKED ON MATERIAL) D1527 Pipe — — Schedule-40 D1785 Pipe — — Schedule-40 Solvent D2235 For ABS — — For ABS Cement D2241 Pipe...

  • Page 23: 24-V Wiring

    100 ft. For wire lengths Step 9—Direct Venting over 100 ft, use AWG No. 16 wire. The 58MTA furnace requires a dedicated (one 58MTA furnace The 24-v circuit contains an automotive-type, 3-amp fuse located only) direct-vent system. In a direct-vent system, all air for on furnace control (See Fig.
  • Page 24 ACRDJ PRINTED CIRCIUT BOARD PRINTED CIRCIUT BOARD...

  • Page 25: Combustion-Air And Vent Piping

    Combustion-air and vent pipes must terminate together in same atmospheric pressure zone, either through roof or sidewall (roof CARBON MONOXIDE POISONING HAZARD termination preferred), using accessory termination kit. Failure to follow the steps outlined below for each appliance See Table 6 for required clearances. connected to the venting system being placed into operation Furnace combustion-air and vent pipe connections must be at- could result in carbon monoxide poisoning or death.
  • Page 26 25--24--65--2 AREA WHERE TERMINAL IS NOT PERMITED VENT TERMINAL AIR SUPPL Y INLET U.S. Installation (2) Item Clearance Description Canadian Installation (1) Clearance above grade, veranda, porch, deck, balcony, or 12˝ (30cm) # 12˝ (30 cm) anticipated snow level Clearance to a window or door that may be opened 12˝...
  • Page 27 SETUP SWITCHES TWINNING AND/OR LOW-HEAT ONLY AND COMPONENT TEST BLOWER OFF-DELAY TERMINAL ACRDJ - AIR CONDITIONING RELAY DISABLE JUMPER 24-V-THERMOSTAT TERMINALS TEST/TWIN TRANSFORMER 24-VAC CONNECTIONS 0.5-AMP024 VAC HUMIDIFIER TERMINAL (24-VAC 0.5 AMP MAX.) PL1 - LOW VOLTAGE MAIN FUSE 3-AMP HARNESS CONNECTOR SEC-1 SEC-2...
  • Page 28 NOTE: Select 1 vent pipe connection and NOTE: Select 1 vent pipe connection and 1 combustion-air pipe connection. 1 combustion-air pipe connection. FLOW COMBUSTION- COMBUSTION- VENT VENT VENT VENT COMBUSTION- COMBUSTION- FLOW UPFLOW DOWNFLOW COMBUSTION- COMBUSTION- VENT VENT FLOW FLOW HORIZONTAL-LEFT DISCHARGE HORIZONTAL-RIGHT DISCHARGE A96187...
  • Page 29 12 ″ MIN 12 ″ MIN VENT PIPE VENT PIPE COMBUSTION-AIR PIPE COMBUSTION-AIR PIPE HORIZONTAL TO ROOF HORIZONTAL TO SIDEWALL COMBUSTION-AIR PIPE VENT PIPE COMBUSTION-AIR PIPE 12 ″ MIN 12 ″ MIN VENT PIPE VERTICAL TO ROOF VERTICAL TO SIDEWALL NOTE: A 12 In.

  • Page 30: Concentric Vent And Combustion-Air Termination Kit Installation

    TABLE 7—MAXIMUM ALLOWABLE PIPE LENGTH (FT) NUMBER OF 90° ELBOWS TERMINATION PIPE DIA ALTITUDE (FT) UNIT SIZE TYPE (IN.)* 1-1/2 2 Pipe or 2-in 060–12 Concentric 1-1/2 080–12 2 Pipe or 2-in 080–16 Concentric 2-1/2 0 to 2000 100-16 2 Pipe or 3-in 2-1/2 100-20 Concentric...
  • Page 31 TABLE 7—MAXIMUM ALLOWABLE PIPE LENGTH (FT) (Continued) NUMBER OF 90° ELBOWS TERMINATION PIPE DIA ALTITUDE (FT) UNIT SIZE TYPE (IN.)* 1-1/2 2 Pipe or 2-in 060-12 Concentric 080-12 2 Pipe or 2-in 080-16 Concentric 2-1/2 4001 to 5000‡ 2-1/2 100-16 2 Pipe or 3-in 100-20 Concentric...
  • Page 32 TABLE 7—MAXIMUM ALLOWABLE PIPE LENGTH (FT) (Continued) NUMBER OF 90° ELBOWS TERMINATION PIPE DIA ALTITUDE (FT) UNIT SIZE TYPE (IN.)* 1-1/2 2 Pipe or 2-in 060-12 Concentric 080-12 2 Pipe or 2-in 080-16 Concentric 2-1/2 8001 to 9000‡ 2-1/2 100-16 2 Pipe or 3-in 100-20 Concentric...

  • Page 33: Multiventing And Vent Terminations

    6. Check required dimensions as shown in Fig. 38 or 39. MULTIVENTING AND VENT TERMINATIONS When 2 or more 58MTA furnaces are vented near each other, each UNIT MAY NOT OPERATE furnace must be individually vented. NEVER common vent or Failure to follow this caution may result in intermittent unit breach vent 58MTA furnaces.

  • Page 34: Application

    Furnace condensate is mildly acidic, typically in the pH range of OVERHANG OR ROOF 3.2 to 4.5. Due to corrosive nature of this condensate, a condensate pH neutralizing filter may be desired. Check with local authorities to determine if a pH neutralizer is required. 12″...
  • Page 35 TABLE 8—MAXIMUM ALLOWABLE EXPOSED VENT PIPE LENGTH (FT) WITH AND WITHOUT INSULATION IN WINTER DESIGN TEMPERATURE AMBIENT* WINTER DESIGN MAX PIPE UNIT WITHOUT WITH 3/8–IN. OR TEMPERATURE DIAMETER SIZE INSULATION THICKER INSULATION† (°F) (IN.) * Pipe length (ft) specified for maximum pipe lengths located in unconditioned spaces. Pipes located in unconditioned space cannot exceed total allowable pipe length as specified in Table 7.
  • Page 36 A96128 Fig. 43—Rooftop Termination (Dimension “A” is Touching or 2–in. Maximum Separation) VENT VENT VENT COMBUSTION COMBUSTION AIR COMBUSTION AIR A93056 Fig. 44—Concentric Vent and Combustion-Air Roof Termination (Dimension “A” is Touching or 2-in. A96129 Maximum Separation) Fig. 46—Raised Sidewall Termination when Wall Penetration is 12 in.

  • Page 37: Prime Condensate Trap With Water

    OPEN STAND PIPE FOR A/C OR HUMIDIFIER DRAIN TO OPEN DRAIN A94054 Fig. 48—Example of Field Drain Attachment A99118 Fig. 50—Inducer Housing Drain Cap CONDENSATE TRAP FIRE HAZARD Failure to follow this caution may result in intermittent unit operation or performance satisfaction. This furnace is equipped with a manual reset limit switch in the burner box area.

  • Page 38: Sequence Of Operation

    NOTE: Low-heat-only switch, SW-1, selects either the low-heat- only operation mode when ON, or adaptive heating mode when OFF, in response to a call for heat. (See Fig. 32.) This furnace can operate as a 2-stage furnace with a single-stage thermostat because furnace control CPU includes a programmed adaptive sequence of controlled operation, which selects low-gas- heat or high-gas-heat operation.

  • Page 39: Two-Stage Heating With Two-Stage Thermostat (Non-Adaptive Heating Mode)

    at SEC1 or SEC2 to the furnace control CPU (not at W/W1, G, 2. Switching From High- To Low- Heat- If the thermostat R to R, etc.). W2 circuit opens, and the R to W1 circuit remains closed, the If flame is proved when flame should not be present, the furnace control CPU will switch the inducer motor IDM speed furnace control CPU will lock out of Gas-Heating mode and from high to low.
  • Page 40 A00277 A00275 Fig. 52C—Two-Stage Furnace with Single-Speed Heat Fig. 52A—Two-Stage Furnace with Single-Speed Air Pump (Dual Fuel) Conditioner A00276 A00278 Fig. 52D—Two-Stage Furnace with Two-Speed Heat Fig. 52B—Two-Stage Furnace with Two-Speed Air Conditioner Pump (Dual Fuel)
  • Page 41 A00281 Fig. 52G—Two-Stage Thermostat With Two-Stage Furnace and Two-Speed Air Conditioner A00279 Fig. 52E—Dual Fuel Thermostat with Two-Stage Furnace and Single-Speed Heat Pump A00282 Fig. 52H—Single-Stage Thermostat With Two-Stage Furnace and Two-Speed Air Conditioner A00280 Fig. 52F—Dual Fuel Thermostat With Two-Stage Furnace and Two-Speed Heat Pump...

  • Page 42: Thermidistat Mode

    Notes for Fig. 52A-H: 1. Heat pump MUST have a high pressure switch for dual fuel applications. 2. Refer to outdoor equipment Installation Instructions for additional information and setup procedure. 3. Select the ″ZONE″ position on the two-speed heat pump control. 4.

  • Page 43: Continuous Blower Mode

    CONTINUOUS BLOWER MODE disappears, the furnace control begins a normal inducer post-purge period and the blower switches to COOL speed after a 3 second When the R to G circuit is closed by the thermostat, the blower delay. If the R to W/W1-and-Y/Y2-and-G or R to W/W1-and-Y1- motor BLWM will operate on continuous-blower speed (can be set and-Y/Y2-and-G signals disappear at the same time, the blower to LO HEAT, HI HEAT, or COOL speed).

  • Page 44: Furnace Restart

    TABLE 10—MODEL 58MTA ORIFICE SIZE AND HIGH/LOW-HEAT MANIFOLD PRESSURES FOR CORRECT INPUTS FOR USE WITH 060 THROUGH 120 SIZE FURNACES ONLY (TABULATED DATA BASED ON 20,000/13,000 BTUH PER BURNER, DERATED 2 PERCENT FOR EACH 1000 FT ABOVE SEA LEVEL)* SPECIFIC GRAVITY OF NATURAL GAS...
  • Page 45 TABLE 10—MODEL 58MTA ORIFICE SIZE AND HIGH/LOW-HEAT MANIFOLD PRESSURES FOR CORRECT INPUTS (Continued) FOR USE WITH 060 THROUGH 120 SIZE FURNACES ONLY(TABULATED DATA BASED ON 20,000/13,000 BTUH PER BURNER, DERATED 2 PERCENT FOR EACH 1000 FT ABOVE SEA LEVEL)* SPECIFIC GRAVITY OF NATURAL GAS...
  • Page 46 TABLE 10—MODEL 58MTA ORIFICE SIZE AND HIGH/LOW-HEAT MANIFOLD PRESSURES FOR CORRECT INPUTS (Continued) FOR USE WITH 060 THROUGH 120 SIZE FURNACES ONLY (TABULATED DATA BASED ON 20,000/13,000 BTUH PER BURNER, DERATED 2 PERCENT FOR EACH 1000 FT ABOVE SEA LEVEL)*...
  • Page 47 BURNER FLAME REGULATOR COVER SCREW BURNER PLASTIC ADJUST SCREW ON/OFF SWITCH REGULATOR SPRING HIGH STAGE GAS PRESSURE REGULATOR ADJUSTMENT PROPANE–WHITE, 13.5 TURNS NATURAL–SILVER,12 TURNS LOW STAGE INLET GAS PRESSURE PRESSURE TAP REGULATOR ADJUSTMENT PROPANE–WHITE, 9.5 TURNS NATURAL–SILVER,9.5 TURNS) MANIFOLD PRESSURE TAP MANIFOLD A89020 A04048...

  • Page 48: Set Temperature Rise

    TABLE 11—ALTITUDE DERATE MULTIPLIER FOR TABLE 12—GAS RATE (CU FT/HR) U.S.A. SIZE OF TEST DIAL SIZE OF TEST DIAL SECONDS SECONDS FOR 1 FOR 1 ALTITUDE PERCENT DERATE MULTIPLIER REVOLUTION REVOLUTION Cu Ft Cu Ft Cu Ft Cu Ft Cu Ft Cu Ft (FT) OF DERATE...

  • Page 49: Adjust Blower Off Delay (Heat Mode)

    a. Place duct thermometers in return and supply ducts as close Table 13–Speed Selection to furnace as possible. Be sure thermometers do not ’see’ LEAD COLOR SPEED AS SHIPPED heat exchangers so that radiant heat does not affect ther- White Common mometer readings.

  • Page 50: Checklist

    CHECKLIST This control shuts off gas control system and energizes air-circulating blower motor if furnace overheats. 1. Put away tools and instruments. Clean up debris. Recommended method of checking this limit control is to 2. Check SW-1 through SW-3 after completing installation to gradually block off return air after furnace has been operating ensure desired settings for thermostat type (SW-1) and for a period of at least 5 minutes.
  • Page 51 CHECKLIST—INSTALLATION LOAD CALCULATION Condensate Drain ____________ Heating Load (Btuh) ________ Unit Level or Pitched Forward ____________ Cooling Load (Btuh) Internal Tubing Connections Free of Kinks ________ and Traps ____________ Furnace Model Selection External Drain Connection Leak Tight and COMBUSTION AND VENT PIPING ________ Sloped Termination Location...
  • Page 52 Copyright 2004 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231 58mta7si Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 1 4 Tab 6a 8a PC 101 Catalog No.

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