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Carrier 58MTA Series, Service Manual

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Carrier 58MTA Series Service Manual Download Page 16

Copyright 2002 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231

58mta4sm

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. 535-80098

Printed in U.S.A.

Form 58MTA-4SM

Pg 16

11-02

Replaces: 58MTA-3SM

Summary of Contents for 58MTA Series

Page 1: ...g Collector Box and Drainage System 6 Servicing Hot Surface Igniter 7 Electrical Controls and Wiring 8 Checking Heat Tape Operation If Applicable 8 Winterizing 9 WIRING DIAGRAM 10 TROUBLESHOOTING 10 Status Codes 10 Component Test 11 SAFETY CONSIDERATIONS Recognize safety information This is the safety alert symbol When you see this symbol on the furnace and in instructions or manuals be alert to t...

Page 2: ...e to the control Tools held in a person s hand during grounding will be satisfactorily discharged 3 After touching the chassis you may proceed to service the control or connecting wires as long as you do nothing that recharges your body with static electricity for example DO NOT move or shuffle your feet DO NOT touch ungrounded objects etc 4 If you touch ungrounded objects recharge your body with ...

Page 3: ...ectrical supply to furnace 2 Remove filter cabinet door 3 Slide filter out of cabinet 4 If equipped with permanent washable filter clean filter by spraying cold tap water through filter in opposite direction of airflow Rinse filter and let dry Oiling or coating of the filter is not recommended 5 If equipped with factory specified disposable media filter replace only with a factory authorized filte...

Page 4: ... assembly on blower shelf 12 Reinstall condensate trap and tubing if previously removed a Reinstall condensate trap in hole in blower shelf b Connect condensate trap drain tubes See Fig 8 or tubing diagram on main furnace door for proper tube location 1 Connect 1 tube blue or blue and white striped from collector box 2 Connect 1 tube violet or unmarked from inducer housing 3 Connect 1 tube relief ...

Page 5: ...rs get an accumulation of light dirt or dust on the inside they may be cleaned by the following procedure NOTE If the heat exchangers get a heavy accumulation of soot and carbon both the primary and secondary heat exchangers should be replaced rather than trying to clean them thoroughly due to their intricate design A build up of soot and carbon indicates that a problem exists which needs to be co...

Page 6: ...s can be inspected by removing the inducer assembly See Flushing Collector Box and Drainage System section for details on removing inducer assembly Step 5 Flushing Collector Box and Drainage System 1 Turn off gas and electrical supplies to furnace 2 Remove main furnace door 3 Disconnect inducer motor and pressure switch wires or connectors 4 Disconnect pressure switch tubes 5 Disconnect vent pipe ...

Page 7: ...e Trap on LEFT Side Optional CAP COLLECTOR BOX DRAIN TUBE BLUE PLUGGEDEND COLLECTORBOX DRAIN TUBE BLUE WHITE STRIPED COLLECTOR BOX TUBE GREEN COLLECTOR BOX TUBE PINK COLLECTOR BOX EXTENSIONTUBE CONDENSA TE TRAP INDUCERHOUSINGDRAINTUBE VIOLET COLLECTOR BOX EXTENSIONTUBE Condensate Trap on RIGHT Side PLUG CAP COLLECTOR BOX DRAIN TUBE BLUE WHITE STRIPED CONDENSA TE TRAP COLLECTOR BOX EXTENSIONTUBE CO...

Page 8: ...tion NOTE If the polarity is not correct the STATUS LED on the furnace control board will flash rapidly and prevent the furnace from operating The control system also requires an earth ground for proper operation of the furnace control board and flame sensor The 24 v circuit contains an automotive type 3 amp fuse located on the control See Fig 12 Any direct shorts of the 24 v wiring during install...

Page 9: ...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 WHT BLK WHT BLK W W1 W2 Y Y2 G NOTES 1 Connect Y terminal as shown for proper operation 2 Some thermostats require a C terminal connection as shown 3 If any of the original wire as supplied must be replaced use same type or equivalent wire 115 V FUSE...

Page 10: ... and all blower off delays must be completed to view previous codes To retrieve previous codes remove 1 of the red main limit or flame rollout switch wires 1 to 4 sec until the LED light goes out then reconnect it Do not leave red wire disconnected for longer periods of time as the control will assume an overtemperature condition exists and will respond with blower operation This places the contro...

Page 11: ...R lead from furnace control 3 Manually close blower door switch 4 For approximately 2 sec short jumper the COM 24v terminal on control to the TEST TWIN 3 16 in quick connect terminal on control until LED turns off Remove jumper from termi nals See Fig 12 NOTE If TEST TWIN and COM 24v terminals are jumpered loner than 2 sec LED will flash rapidly and ignore status code retrieval request Component t...

Page 12: ... EMITTING DIODE FOR STATUS CODES AMBER LGPS LOW GAS PRESSURE SWITCH SPST N O LPS LOW HEAT PRESSURE SWITCH SPST N O LS LIMIT SWITCH AUTO RESET SPST N C OL AUTO RESET INTERNAL MOTOR OVERLOAD TEMPERATURE SWITCH N C PCB PRINTED CIRCUIT BOARD CONTROL PL1 12 CIRCUIT PCB CONNECTOR PL2 3 CIRCUIT PCB HSI IDM CONNECTOR PL3 6 CIRCUIT ICM MOTOR CONNECTOR NOT SHOWN PL4 4 CIRCUIT IDM CONNECTOR PL5 2 CIRCUIT HSI...

Page 13: ...ITCH DID NOT CLOSE OR REOPENED If open longer than five minutes inducer shuts off for 15 minutes before retry If opens during blower on delay period blower will come on for the selected blower off delay Check for Excessive wind Restricted vent Defective inducer motor Low inlet gas pressure if LGPS used Defective pressure switch Low inducer voltage 115 VAC Inadequate combustion air supply Proper ve...

Page 14: ...ducer will run for the entire component test The HSI blower motor LO HEAT speed HI HEAT speed and COOL speed will run for 10 15 seconds each Gas valve and humidifier will not be turned on When the blower motor is turned OFF the inducer will be switched to low speed for 10 seconds Was there a previous status code other than 11 Is door switch closed Is there 115V going to switch Replace door switch ...

Page 15: ...ION PROVING FAILURE If flame is not sensed during the trial for ignition period the control will repeat the ignition sequence 3 more times before lockout 14 occurs If flame signal is lost during the blower on delay period blower will come on for the selected blower off delay Check the following items first before proceeding to the next step Gas valve turned off Manual shut off valve Green Yellow w...

Page 16: ...31 58mta4sm 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 535 80098 Printed in U S A Form 58MTA 4SM Pg 16 11 02 Replaces 58MTA 3SM ...

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