Carrier 58DXT Operating Instructions Manual Download Page 23

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CHECKLIST—INSTALLATION

LOAD CALCULATION

________

Heating Load (Btuh)

________

Cooling Load (Btuh)

________

Furnace Model Selection

AIR FOR COMBUSTION AND VENTILATION

________

Unconfined Space

________

Confined Space

VENTING

________

NFGC (United States)

________

NSCNGPIC (Canada)

________

Local Codes

________

1/4-in. Upward Slope

________

Joints Secure

________

See Attached Vent Table Instructions

CHECKLIST—START-UP

________

Gas Input Rate
(Set Within 2 percent of Rating
Plate)

________

Temperature Rise Adjusted

________

Thermostat Anticipator Setting Ad-
justed or

________

Thermostat Cycle Rate (3 Cycles per
Hr) Selected

CHECK SAFETY CONTROLS OPERATION

________

Primary Limit

________

Pressure Switches

________

Draft Safeguard Switch

________

Auxiliary Limit Switch(es)

Summary of Contents for 58DXT

Page 1: ...nd on labels attached to or shipped with the unit and other safety precautions that may apply Follow all safety codes In the United States follow all safety codes including the National Fuel Gas Code NFGC NFPA 54 1996 ANSI Z223 1 1996 and the Installation Standards Warm Air Heating and Air Conditioning Systems NFPA 90B ANSI NFPA 90B In Canada refer to the CAN CGA B149 1 and 2 M95 National Standard...

Page 2: ...uching ungrounded objects 7 An ESD service kit available from commercial sources may also be used to prevent ESD damage INTRODUCTION The model 58DXT Series 110 or Series 120 Furnace is available in sizes 63 000 through 105 000 Btuh input capacities The design of the downflow gas fired furnace is A G A C G A certified for natural and propane gases and for installation on noncombustible flooring The...

Page 3: ...mponent door This label explains how to use the LED status indicated on furnace control which is viewed through the sight glass on door Improper installation adjustment alteration service mainte nance or use can cause carbon monoxide poisoning explo sion fire electrical shock or other conditions which may cause personal injury loss of life or property damage Consult a qualified installer service a...

Page 4: ...r must prevent chilled air from entering furnace If dampers are manually operated they must be equipped with means to prevent operation of either unit unless damper is in full heat or full cooling position HAZARDOUS LOCATIONS Step 2 Air for Combustion and Ventilation Provisions for adequate combustion and ventilation air must be provided in accordance with Section 5 3 Air for Combustion and Ventil...

Page 5: ... air from an unconfined space inside the structure requires 2 openings for structures not usually tight a Each opening MUST have at least 1 sq in of free area per 1000 Btuh of total input for all equipment within the confined space but not less than 100 sq in per opening See Fig 3 and Table 2 The minimum dimension of air openings shall not be less than 3 in b If the building is constructed unusual...

Page 6: ...he first branch take off may require internal acoustical lining As an alternative fibrous ductwork may be used if constructed and installed in accordance with the latest edition of SMACNA construction standard on fibrous glass ducts Both acoustical lining and fibrous ductwork shall comply with NFPA 90B as tested by UL Standard 181 for Class 1 Rigid air ducts SUPPLY AIR CONNECTIONS Connect supply a...

Page 7: ...m of 2 in outside furnace casing Use the proper length of pipes to avoid stress on gas control manifold A failure to follow this warning could result in a gas leak causing fire explosion personal injury or death Use a backup wrench at furnace gas control when connecting gas pipe to furnace to avoid damaging gas controls or manifold Table 3 Opening Dimensions In FURNACE CASING WIDTH APPLICATION PLE...

Page 8: ...or test gage connection Installation of additional 1 8 in NPT plugged tapping accessible for test gage connection installed immediately upstream of gas supply connection to furnace and downstream of manual shutoff valve is not required Place ground joint union between gas control manifold and manual shutoff Fig 6 Furnace Plenum and Subbase Installed on a Combustible Floor A96285 DOWNFLOW SUBBASE S...

Page 9: ...wn in Fig 11 or 12 for proper operation in cooling mode Use AWG No 18 color coded copper thermostat wire only The 24 v circuit contains an automotive type 3 amp fuse located on main control Any 24 v electrical shorts during installation service or maintenance could cause this fuse to blow If fuse replacement is required use ONLY a 3 amp fuse The control will flash code 24 when fuse needs replaceme...

Page 10: ...e thermostat to select gas heating modes The W2 from thermostat must be connected to W2 on furnace control terminal block See Fig 12 Before operating furnace check each manual reset switch for continuity If necessary press and release button to reset switch This furnace is equipped with 2 manual reset limit switches in gas control area The switches will open and shut off power to gas valve if a fl...

Page 11: ...IELD SUPPLIED FUSED DISCONNECT 2 SPEED CONDENSING UNIT FURNACE G R W2 Y2 G Y1 C GND GND FIELD 24 V WIRING FIELD 115 208 230 460 V WIRING FACTORY 24 V WIRING FACTORY 115 V WIRING 208 230 OR 460 V THREE PHASE 208 230 V SINGLE PHASE Y2 Y1 C WHT BLK WHT BLK W1 R W2 COM W W1 Y Y2 NOTES 1 Connect Y terminal as shown for proper operation 2 Some thermostats require a C terminal connection as shown 3 If an...

Page 12: ...witches ALS1 2 used on some horizontal and some downflow models 7 This wire must be connected to furnace sheet metal for control to prove flame 8 Factory connected when LGPS not used RED LS FRS2 RED RED FRS1 WHEN USED ALS1 DSS ORN LGPS YEL NOTE 8 LPS NOTE 8 WHEN USED RED YEL ORN WHEN USED NOTE 6 ALS2 ORN SWITCH 1 2 HEAT SET UP SWITCH NORM HI HT LO HT ON OFF OFF ON BLOWER OFF DELAY SEC SWITCH 3 4 9...

Page 13: ...ower on delay If burner flame is proven 45 sec after gas valve GV is opened blower motor BLWM is energized on appropriate heating speed low gas heat or high gas heat speed Simultaneously EAC terminals EAC 1 and EAC 2 are energized with 115v and remain energized as long as blower motor BLWM is energized f Switching from low to high gas heat If furnace control CPU switches from low gas heat to high ...

Page 14: ...continuous blower speed 3 When thermostat calls for high cooling blower motor BLWM operates on high cool speed When thermostat is satisfied blower motor BLWM operates an additional 2 sec on high cool speed before reverting back to continuous blower speed 4 When R to G circuit is opened blower motor BLWM continues operating for an additional 90 sec if no other function requires blower motor BLWM op...

Page 15: ... or other sources of ignition to check for gas leakage Use a soap and water solution to check for gas leaks A failure to follow this warning could result in fire explosion personal injury or death 3 To operate furnace follow procedures on operating instruction label attached to furnace 4 With furnace operating set thermostat below room tempera ture and observe that furnace goes off Set thermostat ...

Page 16: ... from 2000 to 4500 ft this furnace must be derated 10 percent by an authorized Gas Conver sion Station or Dealer To determine correct input rate for altitude see example above and use 0 82 as derate multi plier factor b Check that gas valve adjustment caps are in place for proper input to be clocked c Obtain yearly heat value average for local gas supply NOTE Be sure heating value of gas used for ...

Page 17: ...42 3 2 1 3 42 3 3 1 4 42 3 4 1 4 42 3 5 1 4 Altitudes 800 43 3 5 1 4 43 3 6 1 5 43 3 7 1 5 42 3 2 1 3 42 3 3 1 3 2001 825 44 3 8 1 6 43 3 4 1 4 43 3 5 1 5 43 3 6 1 5 43 3 7 1 5 to 850 44 3 6 1 5 44 3 7 1 5 44 3 8 1 6 43 3 4 1 4 43 3 5 1 5 3000 875 44 3 4 1 4 44 3 5 1 4 44 3 6 1 5 44 3 7 1 5 44 3 8 1 6 or 900 44 3 2 1 3 44 3 3 1 4 44 3 4 1 4 44 3 5 1 4 44 3 6 1 5 Canada 925 46 3 8 1 6 45 3 8 1 6 44...

Page 18: ... 4 725 44 3 3 1 4 44 3 4 1 4 44 3 5 1 4 44 3 6 1 5 44 3 7 1 5 750 45 3 7 1 5 44 3 2 1 3 44 3 3 1 4 44 3 4 1 4 44 3 5 1 4 775 46 3 6 1 5 46 3 8 1 6 45 3 7 1 5 44 3 2 1 3 44 3 3 1 4 5001 800 46 3 4 1 4 46 3 5 1 5 46 3 7 1 5 46 3 8 1 6 45 3 7 1 5 825 47 3 7 1 5 47 3 8 1 6 46 3 4 1 4 46 3 6 1 5 46 3 7 1 5 to 850 47 3 4 1 4 47 3 6 1 5 47 3 7 1 5 47 3 8 1 6 46 3 5 1 4 875 48 3 7 1 5 48 3 8 1 6 47 3 5 1 ...

Page 19: ...Low Orifice No Manifold Pressure High Low Orifice No Manifold Pressure High Low U S A Only 600 45 3 7 1 5 44 3 2 1 3 44 3 3 1 4 44 3 4 1 4 44 3 5 1 4 625 46 3 6 1 5 46 3 7 1 5 46 3 8 1 6 45 3 8 1 6 44 3 2 1 3 8001 650 47 3 8 1 6 46 3 4 1 4 46 3 5 1 5 46 3 7 1 5 46 3 8 1 6 675 47 3 5 1 4 47 3 6 1 5 47 3 7 1 5 47 3 8 1 6 46 3 5 1 4 to 700 48 3 7 1 5 48 3 8 1 6 47 3 5 1 4 47 3 6 1 5 47 3 7 1 5 725 48...

Page 20: ...ature rise by adjusting blower speed Increase blower speed to reduce temperature rise Decrease blower speed to increase temperature rise For high heat speed selection can be med high med 5 speed blowers only or med low factory setting For low heat speed tap selection can be low factory setting med low or med 5 speed blowers only Table 10 Gas Rate Cu Ft Hr SECONDS FOR 1 REVOLUTION SIZE OF TEST DIAL...

Page 21: ...ferred method of checking limit control is to gradually block off return air after furnace has been operating for a period of at least 5 minutes As soon as limit has shut off burners return air opening should be unblocked By using this method to check limit control it can be established that the limit is functioning properly and will operate if there is a motor failure 2 Check draft safeguard swit...

Page 22: ... furnace i Remove blower access door j Reconnect red motor lead reset switch and replace door k Turn on 115 v power to furnace CHECKLIST 1 Put away tools and instruments and clean up debris 2 Check SW 1 through SW 4 after completing installation to ensure desired settings for thermostat type SW 1 and SW 2 and blower off delay SW 3 and SW 4 Refer to Tables 6 and 7 3 Verify manual reset switches hav...

Page 23: ...ocal Codes ________ 1 4 in Upward Slope ________ Joints Secure ________ See Attached Vent Table Instructions CHECKLIST START UP ________ Gas Input Rate Set Within 2 percent of Rating Plate ________ Temperature Rise Adjusted ________ Thermostat Anticipator Setting Ad justed or ________ Thermostat Cycle Rate 3 Cycles per Hr Selected CHECK SAFETY CONTROLS OPERATION ________ Primary Limit ________ Pre...

Page 24: ...ce Training plus hands on the products in our labs can mean increased confidence that really pays dividends in faster troubleshooting fewer callbacks Course descriptions and schedules are in our catalog CALL FOR FREE CATALOG 1 800 962 9212 Packaged Service Training Classroom Service Training Copyright 1999 CARRIER Corp 7310 W Morris St Indianapolis IN 46231 58dxt4si Manufacturer reserves the right...

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