Page 1: Table Of Contents
58CU0A 4---Way Multipoise, Ultra Low NOx Communicating, 80% AFUE Gas Furnace Input Capacities: 40,000 thru 100,000 Btuh Installation, Start---up, Operating and Service and Maintenance Instructions SAFETY CONSIDERATIONS ......COMPONENT TEST .
Page 2: Safety Considerations
SAFETY CONSIDERATIONS 1. Use only with type of gas approved for this furnace. Refer to the furnace rating plate. 2. Install this furnace only in a location and position as WARNING specified in the “Location” section of these instructions. 3. Provide adequate combustion and ventilation air to the FIRE, EXPLOSION, ELECTRICAL SHOCK, AND furnace space as specified in “Air for Combustion and Ventilation”...
Page 3 A180207 Fig. 1 - - Dimensional Drawing Table 1 – Dimensions ACCESSORY FILTER CABINET OUTLET TOP FLUE BOTTOM VENT MEDIA WIDTH WIDTH COLLAR ONLY INLET WIDTH SHIP WT. CABINET SIZE CONNECTION IN. (MM) IN. (MM) IN. (MM) IN. (MM) IN. (MM) SIZE LB.
Page 4: Codes And Standards
Duct Systems Air Conditioning Contractors Association (ACCA) Manual D, Sheet Metal and Air Conditioning Contract- ors National Association (SMACNA), or American Society of Heating, Refrigeration, and Air Condition- ing Engineers (ASHRAE) 2005 Fundamentals Hand- book Chapter 35 or 2004 HVAC Systems and Equip- ment Handbook Chapters 9 and 16.
Page 5: Location
THE BLOWER IS LOCATED BELOW THE BURNER SECTION, AND CONDITIONED AIR IS DISCHARGED UPWARD. THE BLOWER IS LOCATED TO THE RIGHT OF THE BURNER SECTION, AND AIR CONDITIONED AIR IS DISCHARGED TO THE LEFT. THE BLOWER IS THE BLOWER IS LOCATED ABOVE THE LOCATED TO THE LEFT OF THE BURNER SECTION,...
Page 6 WARNING FIRE HAZARD Failure to follow this warning could result in personal injury, death, and/or property damage. When the furnace is installed in a residential garage, the burners and ignition sources must be located at least 18 inches above the floor. (See Fig. 5) The furnace must be located or protected to avoid damage by vehicles.
Page 7: Safety Considerations
a. One opening MUST commence within 12- -in. (300 mm) CAUTION of the ceiling and the second opening MUST commence within 12- -in. (300 mm) of the floor. b. Size openings and ducts per Fig. 7 and Table 2. FURNACE CORROSION HAZARD Failure to follow this caution may result in furnace damage.
Page 8 WARNING = 21ft Volume other 1000 Btu/hr Other CARBON MONOXIDE POISONING HAZARD Failure to follow this warning could result in death and/or A04002 personal injury. 2. For fan- -assisted appliances such as this furnace: Many homes require air to be supplied from outdoors for furnace combustion, ventilation, and dilution of flue gases.
Page 9: Installation
b. Outdoor opening size reduction Factor is 1 minus the 4. Adjust outside nut to provide desired height, and tighten Ratio in a. above. inside nut to secure arrangement. c. Minimum size of Outdoor openings shall be the size 5. Reinstall bottom closure panel if removed. required in Outdoor Combustion Air Method above 5/ 16 ...
Page 10: Horizontal Installation
4. Reinstall bottom filler panel and screws FURNACE APPROVED COIL ASSEMBLY COIL BOX COMBUSTIBLE FLOORING PLENUM OPENING SHEET METAL PLENUM FLOOR OPENING FLOOR OPENING A96283 A08556 Fig. 11 - - Floor and Plenum Opening Dimensions Fig. 13 - - Furnace, Plenum, and Coil Assembly or Coil Box Installed on a Combustible Floor FURNACE HORIZONTAL INSTALLATION...
Page 11: Air Ducts
Suspended Furnace Support There are no provisions for an internal filter rack in these furnaces. The furnace may be supported under each end with threaded rod, A field- -supplied accessory external filter is required. angle iron or metal plumber’s strap as shown. (See Fig. 15 and 16) Secure angle iron to bottom of furnace as shown.
Page 12 flange temporarily while the remaining attachment and sealing of the coil are performed. Downflow Furnaces Connect supply- -air duct to supply- -air outlet on furnace. Bend flange inward past 90_ with wide duct pliers. (See Fig. 14) The supply- -air duct must be connected to ONLY the furnace supply outlet or air conditioning coil casing (when used).
Page 13 A180240 Fig. 17 - - Typical Attic Installation Return Air Connections WARNING FIRE HAZARD Failure to follow this warning could cause personal injury, death and/or property damage. Never connect return- -air ducts to the back of the furnace. Follow instructions below Downflow Furnaces The return- -air duct must be connected to return- -air opening (bottom inlet) as shown in Fig.
Page 14: Gas Piping
CAUTION FURNACE OVERHEAT HAZARD Failure to follow this caution may result in property damage. Connect gas pipe to gas valve using a backup wrench to avoid damaging gas controls and burner misalignment. WARNING FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in personal injury, death, and/or property damage.
Page 15: Electrical Connections
If pressure exceeds 0.5 psig (14- -In. W.C.), gas supply pipe must be disconnected from furnace and capped before and during SUPPLY supply pipe pressure test. If test pressure is equal to or less than MANUAL 0.5 psig (14- -In. W.C.), turn off electric shutoff switch located on SHUTOFF furnace gas control valve and accessible manual equipment VALVE...
Page 16: 115- -V Wiring
5. Route J- -Box wires within furnace away from sharp edges, WARNING rotating parts and hot surfaces. ELECTRICAL CONNECTION TO J- -BOX ELECTRICAL SHOCK AND FIRE HAZARD Electrical Box on Furnace Casing Side Failure to follow this warning could result in personal WARNING injury, death, or property damage.
Page 17: 24- -V Wiring
operation. Use only AWG No. 18, color- -coded, copper thermostat wire. The 24- -v circuit contains an automotive- -type, 3- -amp. fuse located on the control. Any direct shorts during installation, service, or maintenance could cause this fuse to blow. If fuse replacement is required, use ONLY a 3- -amp.
Page 18 FIELD 24-VOLT WIRING FIELD 115-, 208/230-, 460-VOLT WIRING FACTORY 24-VOLT WIRING FACTORY 115-VOLT WIRING NOTE 2 1-STAGE THERMOSTAT FIVE FIELD-SUPPLIED TERMINALS WIRE FUSED DISCONNECT THREE-WIRE 208/230- OR HEATING- 460-VOLT ONLY THREE PHASE 208/230- W/W1 VOLT NOTE 1 SINGLE Y/Y2 115-VOLT FIELD- JUNCTION PHASE SUPPLIED...
Page 19 A190371 Fig. 29 - - Two- -Stage Thermostat with 1- -Speed Variable Fur- nace and Two- -Speed Air Conditioner A190368 Fig. 27 - - 1- -Speed Variable Furnace with Single- -Speed Heat Pump (Dual Fuel) A190173 Fig. 30 - - Single- -Stage Thermostat with 1- -Speed Variable Furnace and Two- -Speed Air Conditioner A190370 Fig.
Page 20: Venting
VENTING GENERAL VENTING REQUIREMENTS Follow all safety codes for proper vent sizing and installation The furnace shall be connected to a listed factory built chimney requirements, including local building codes, the current edition or vent, or a clay- -tile lined masonry or concrete chimney. Venting of National Fuel Gas Code ANSI Z223.1/NFPA 54 (NFGC), into an unlined masonry chimney or concrete chimney is Parts 12 and 13, the local building codes, and furnace and vent...
Page 21: Appliance Application Requirements
Table 7 – Minimum Allowable Input Rating of Table 8 – Combined Appliance Maximum Input Rating in Space- -Heating Appliance in Thousands of BTUH per Hour Thousands of BTUH per Hour INTERNAL AREA OF CHIMNEY INTERNAL AREA OF CHIMNEY VENT HEIGHT .
Page 22 A180242 Fig. 31 - - Chimney Inspection Chart...
Page 23: Additional Venting Requirements
ADDITIONAL VENTING REQUIREMENTS CAUTION A 4” (101 mm) round vent elbow is supplied with the furnace. A 5- -inch (127 mm) or 6- - inch (152 mm) vent connector may be CUT HAZARD required some model furnaces. field- -supplied 4- -inch- -to- -5- -inch (101 - - 127 mm) or 4- -inch- -to- -6- -inch (101 - - Failure to follow this caution may result in personal injury.
Page 24 SEE NOTES: 1,2,4,7,8,9 on the page following these figures A03213 Fig. 34 - - Horizontal Left Application- -Vent Elbow Left SEE NOTES: 1,2,4,5,6,7,8,9 on the page following these figures A03207 Fig. 37 - - Downflow Application- -Vent Elbow Left then Up SEE NOTES: 1,2,4,5,7,8,9 on the page following these figures A03215...
Page 25: Start- -Up, Adjustment, And Safety Check
START- - UP, ADJUSTMENT, AND SAFETY Refer to service label attached to furnace or See Fig. 38. CHECK Component test sequence is as follows: General a. Inducer motor turns on at 50% duty cycle for 15 secs, then stays on for the entire test. WARNING b.
Page 26: Furnace Setup Switches
Table 10 – Furnace Setup Switch Description A190351...
Page 27 A190348 Fig. 38 - - Service Label...
Page 28 2. Determine the correct outlet gas pressure adjustment. h. Install regulator seal cap. a. Obtain average yearly gas heat value (at installed altitude) i. Leave manometer or similar device connected and pro- from local gas supplier. ceed to next step. b.
Page 29 e. To increase heating airflow, set Comfort/Efficiency CAUTION SW1- -4 on furnace control to OFF = Efficiency. f. Repeat steps a through e. g. When correct input rate and temperature rise is achieved, FURNACE OVERHEATING HAZARD turn gas valve ON/OFF switch to OFF. Failure to follow this caution may result in reduced furnace h.
Page 30: Air Delivery - - Cfm
9. Set Airflow for Continuous Fan/Low Speed Cooling airflow from Fig. 42. For airflow at 400 CFM per ton, turn Airflow The ECM blower motor can be adjusted for Setup SW1- -5 ON (See Fig. 42) The airflow selected for continuous fan speeds different than heating or cooling fan low speed cooling will also be the airflow used for speed.
Page 31 Air Delivery - - CFM continued (with Filter)* (SW1--- 5 and SW4--- 3 set to OFF, except as indicated. See notes 1 and 2) 080C21--- 20 Clg/CF Switch settings External Static Pressure (ESP) Size: Clg Switches SW2--- 3 SW2--- 2 SW2--- 1 Clg Default: 1905...
Page 32: Cooling Or Continuous Airflow
BASED ON 350 CFM/TON (SETUP SWITCH SW1---5 OFF, SW4---3 OFF) SETUP SWITCH SW2 OR SW3 POSITIONS Model Size 3T-040 1050 1225 1400 1400 4T-060 1050 1225 1400 1400 5T-080 1050 1225 1400 1750 2100 5T-100 1050 1225 1400 1750 2100 BASED ON 400 CFM/TON (SETUP SWITCH SW1---5 ON, SW4---3 OFF) SETUP SWITCH SW2 OR SW3 POSITIONS Model Size...
Page 33: Checklist
Checklist Table 14 – Gas Valve Outlet Pressure for Gas Heat Values at Altitude - - 40,000 1. Put away tools and instruments. Clean up debris. 2. Verify that switches SW1- -1 and SW1- -6 are OFF and oth- (Tabulated Data Based on 40,000 BTUH Input for 0-ft (0m) to er setup switches are set as desired.
Page 34 Table 15 – Gas Valve Outlet Pressure for Gas Heat Values at Table 16 – Gas Valve Outlet Pressure for Gas Heat Values at Altitude - - 60,000 Altitude - - 80,000 (Tabulated Data Based on 60,000 BTUH Input for 0-ft (0m) to (Tabulated Data Based on 80,000 BTUH Input, for 0-ft (0-m) to 5000-ft (1524-m) above sea level) 5000-ft (1524-m) above sea level)
Page 35: Service And Maintenance Procedures
Table 17 – Gas Valve Outlet Pressure for Gas Heat Values at WARNING Altitude - - 100,000 (Tabulated Data Based on 100,000 BTUH Input, for 0-ft (0-m) FIRE, INJURY, OR DEATH HAZARD to 5000-ft (1524-m) above sea level) Failure to follow this warning could result in personal SPECIFIC GRAVITY OF injury, death and/or property damage.
Page 36: Care And Maintenance
The control system also requires an earth ground for proper WARNING operation of the control and flame- -sensing electrode. The 24- -v circuit contains an automotive- -type, 3- -amp. fuse ELECTRICAL SHOCK HAZARD located on the control. (See Fig. 45) Any shorts of the 24- -v wiring during installation, service, or maintenance will cause this Failure to follow this warning could result in personal injury, fuse to blow.
Page 37: Cleaning And/Or Replacing Air Filter
ber and size. For expandable replacement media, refer to WARNING the instructions included with the replacement media. 6. Slide filter into cabinet. CARBON MONOXIDE POISONING AND 7. Replace filter cabinet door. FIRE HAZARD 8. Turn on electrical supply to furnace. Failure to follow this warning could result in personal injury, death and/or property damage.
Page 38: Flame Sensor Cleaning And Servicing
Loosen set screw on blower wheel and reposition if neces- WARNING sary. 11. Spin the blower wheel by hand to verify that the wheel does not rub on the housing. ELECTRICAL SHOCK AND FIRE HAZARD 12. Reinstall blower assembly in furnace. Failure to follow this warning could result in personal injury, 13.
Page 39: Cleaning Heat Exchanger
CLEANING HEAT EXCHANGER The following steps should be performed by a qualified service agency: NOTE: If the heat exchangers get a heavy accumulation of soot and carbon, they should be replaced rather than trying to clean them thoroughly. A heavy build- -up of soot and carbon indicates that a problem exists which needs to be corrected, such as improper adjustment of gas valve outlet pressure, insufficient or poor quality combustion air, incorrect size or damaged orifice(s),...
Page 40: Sequence Of Operation
b. Transducer The blower door must be installed for power to be conducted through the blower door interlock switch ILK to the furnace c. Limit over- -temperature switch control CPU, transformer TRAN, inducer motor IDM, blower d. Gas valve motor BLWM, hot- -surface ignitor HSI, and gas valve GV. e.
Page 41 heat airflow for 90, 120, 150, or 180 seconds (depend- opened. The outdoor unit stops, and the furnace blower BLWM ing on selection at blower- -OFF delay switches). The and electronic air cleaner terminal EAC- -1 will remain energized furnace control CPU is factory- -set for a 120- -second for an additional 90 seconds.
Page 42: Wiring Diagrams
a. When the R- -to- -Y1 circuit is closed, R- -to- -G circuit is times as desired and is stored in the memory to be open, and there is a demand for dehumidification, the automatically used following a power interruption. furnace blower motor BLWM will drop the blower NOTE: If the blower- -off delay is set to the maximum (SW1- -7 airflow to 65 percent of low- -cooling airflow for a...
Page 43 A190249 Fig. 45 - - Wiring Diagram...
Page 44: Parts Replacement Information Guide
Catalog No: 58CU0A ---01SI Copyright 2019 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231 Edition Date: 09/19 Replaces: NEW Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Carrier 58CU0A Series Installation, Start-Up, Operating And Service And Maintenance Instructions

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