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3DJH 

PROBLEM 6: BURNERS LIGHT WITH HEATING DEMAND BUT UNIT SHUTS DOWN

PREMATURELY (CONT.)

Condition

Possible Cause

Corrective Action/Comments

6.3

-- Combustion air blower ener-

gizes with a heating demand.

-- Burners light.

-- Roll--out switch trips during the

heating demand.

-- Diagnostic lights flash roll--out

failure.

6.3.1

Unit is firing above 100% of the

nameplate input.

ACTION 1 -- Check that the manifold pressure

matches value listed on nameplate. See

installation instructions for proper proce-

dure.

ACTION 2 -- Verify that the installed orifice

size match the size listed on the nameplate or

installation instructions.

ACTION 3 -- Check gas valve sensing hose to

insure no leaks are present.

ACTION 4 -- Check the input rate to verify rate

matches value listed on nameplate.

LED#1--On

LED#2--Slow Flash

6.3.2

Gas orifices leak at the manifold

connection.

ACTION 1 -- Tighten orifice until leak is sealed.

NOTE: Be careful not to strip orifice threads.

ACTION 2 -- Check for gas leakage at the

threaded orifice connection. Use approved

method for leak detection (see unit instruc-

tions).

6.3.3

Insufficient flow through the heat

exchanger caused by a sooted or

restricted heat exchanger.

ACTION 1 -- Check for sooting deposits or oth-

er restrictions in the heat exchanger assem-

bly. Clean assembly as outlined in instruction

manual.

ACTION 2 -- For G24M gas furnaces, check for

proper combustion and flow. CO2 should

measure between 6.0% and 8.0% for NG and

between 6.5% and 8.5% for LP. CO should

measure below .04% (400PPM) in an air--free

sample of flue gases for either NG or LP.

6.3.4

Burners are not properly located in

the burner box.

ACTION 1 -- Check that the burners are firing

into the center of the heat exchanger open-

ings. Correct the location of the burners if

necessary.

6.4

-- Combustion air blower ener-

gizes with a heating demand.

-- Burners light roughly and the

unit fails to stay lit.

-- Diagnostic lights flash watch-

guard flame failure.

6.4.1

Recirculation of flue gases. This

condition causes rough ignitions

and operation. Problem is charac-

terized by nuisance flame failures.

ACTION 1 -- Check for proper flow of exhaust

gases away from intake vent. Remove any

obstacles in front of the intake and exhaust

vent which would cause recirculation.

ACTION 2 -- Check for correct intake and ex-

haust vent installation. See instructions

guard flame failure.

LED#1--Alternating Slow Flash

LED#2--Alternating Slow Flash

6.4.2

Improper burner cross--overs

ACTION 1 -- Remove burner and inspect the

cross--overs for burrs, or any restriction or if

crossover is warped. Remove restriction or

replace burners.

Содержание G24M SERIES

Страница 1: ...of local or state codes the guidelines and procedures outlined in this manual except where noted are recommended only and do not constitute code SPECIFICATIONS Model No G24M2 X 45 G24M2 60 G24M3 X 60...

Страница 2: ...characteristics 120 volts 60 hertz 1 phase less than 12 amps All models H Optional Accessories Must Be Ordered Extra H LPG propane kit LB 69845L 38K84 LB 69845K 81J14 Twinning Kit 96J69 5 lbs 2 kg Up...

Страница 3: ...6 x 20 x 1 Filter Rack No Size of Filters mm 2 406 x 508 x 25 Down flow Combustible Floor Base LB 79239B 67J92 10 lbs 4 kg LB 79239C 67J93 12 lbs 5 kg Sidewall Power Venting Kit 79J15 25 lbs 11 kg Han...

Страница 4: ...e Also see Filter Air Resistance table G24M4 75 G24M3 4 100 AND G24M3 4 120 BLOWER PERFORMANCE External Static Air Volume at Various Blower Speeds External Static Pressure High Medium High Medium Medi...

Страница 5: ...0 1125 2105 995 1930 910 1675 790 1480 700 30 75 2360 1115 2090 985 1915 905 1670 790 1470 695 40 100 2310 1090 2050 965 1870 880 1650 780 1440 680 50 125 2260 1065 2000 945 1810 855 1610 760 1410 665...

Страница 6: ...RY LIMITS FRONT LOUVERED PANEL DOOR INTERLOCK SWITCH CONTROL BOARD TRANSFORMER PRESSURE SWITCH NOx TURBULATOR LOW PRESSURE SWITCH Propane Only PRIMARY LIMIT FIGURE 2 HEATING COMPONENTS shown in horizo...

Страница 7: ...PRIMARY LIMIT ROLLOUT SWITCHES SURELIGHT IGNITOR FIGURE 4 To Access Blower 1 Turn off power to unit and disconnect L1 and L2 line voltage power 2 Disconnect thermostat wiring connec tions from furnac...

Страница 8: ...Shock hazard Disconnect power before servicing Control is not field repairable If control is inoperable simply replace entire control Can cause injury or death Unsafe operation will result if repair...

Страница 9: ...ration signaled when heating demand initiated at thermostat SLOW FLASH ON Primary or Secondary limit open Units with board 63K8901 or 24L85 Limit must close within 5 trials for ignition or board goes...

Страница 10: ...20 seconds after which the gas valve opens for a 4 second trial for ignition The ignitor stays en ergized for the first second of the 4 second trial G24M units with 63K89 24L85 or 56L83 the ignitor s...

Страница 11: ...e After a demand the combustion air blower continues to operate for 5 seconds post purge before stopping Post purge allows the heat exchanger to be cleared of combustion products Ignition Control The...

Страница 12: ...he indoor blower starts after a 45 second delay Gas valve remains open and blower continues to run until demand stops flame sensor senses loss of flame a limit opens or the prove switch opens If any o...

Страница 13: ...C Out T o Rollout Switches RO IN J20 P20 Pin 15 24VAC In From Rollout Switches SPARK ELECTRODE Male Spark Plug Type High Voltage Out T o Spark Electrode FS J20 P20 Pin 12 Flame Microamp Sensing FIGURE...

Страница 14: ...ly reset a tripped switch push the reset button located on the control FIGURE 12 ROLLOUT SWITCH S47 MANUAL RESET BUTTON E Primary Limit Control S10 FIGURE 13 G24M SERIES UNITS LIMIT CONTROL FOR THIS T...

Страница 15: ...ition control 24V applied to the terminals energizes the valve Inlet and outlet pressure taps are located on the valve A regulator adjustment screw is located on the valve Refer to figure 17 or 18 for...

Страница 16: ...y and Seasonal Checks 1 Inspect electrical wiring both field and factory installed for loose connections Tighten as required 2 Check voltage at disconnect switch Voltage must be within range listed on...

Страница 17: ...ent dam age to gas valve or overfire For natural gas units op erating pressure at unit gas connection must be be tween 5 0 W C and 13 0 W C For L P gas units operating pressure at unit gas connection...

Страница 18: ...itudes Refer to table 12 for pressure switch replacement for models at elevations of 4500 feet 1372m and greater TABLE 11 ALTITUDE feet m GAS FUEL MANIFOLD PRESSURE in W C kPa 0 4500 Natural 3 5 0 87...

Страница 19: ...unit rating plate To Measure Temperature Rise 1 Place plenum thermometers in the supply and return air plenums Locate supply air thermometer in the first horizontal run of the plenum where it will no...

Страница 20: ...SE CURELY IN PLACE E Blower Speed Taps Leaded Motors Blower speed tap changes are made on the SureLight control board See figure 6 Unused taps must be secured on dummy terminals PARK M1 and or PARK M...

Страница 21: ...tial for gas leaks fire or explosion Some soaps used for leak detection are corrosive to certain metals Carefully clean piping thor oughly after leak detection has been completed Can cause damage to p...

Страница 22: ...92 7 7 3 0 5 1 5 0 1 851 6 167 5 75 16 250 5 225 17 5 2 6 7 20 867 21 5 2 5 35 6685 6 7 1 7 5 35 0 5 0 7 0 52 287 6 7 6 85 COMPRESSOR COMMON POWER HEAT INDOOR BLOWER COMMON HS UNIT COMMON HS UNIT COMP...

Страница 23: ...lower nears full speed combustion air prove switch S18 closes 5 When S18 closes assuming the flame rollout switch S47 primary limit S10 and secondary limits S21 are closed the furnace control begins a...

Страница 24: ...N RESET THERMOSTAT LED 5 flash if flame sensed with valve off LED Steady on if control board failure NO NO CHECK TO SEE IF MAIN VALVE IS OFF SEQUENCE HOLDS UNTIL HI LIMIT CLOSES LED 4 flashes NO CHECK...

Страница 25: ...e REMAINS UNCHANGED THROUGHOUT SEQUENCE THERMOSTAT CALLS FOR COOLING SYSTEM FAN SWITCHES TO HEATING SPEED AFTER SELECTED DELAY ACC TERM REMAINS ENERGIZED SYSTEM FAN SWITCHED TO COOLING SPEED ACC TERMI...

Страница 26: ...Pressure Switch delay Once S18 closes a 15 second pre purge follows 4 SureLight control energizes ignitor A 20 second warm up period begins 5 Gas valve opens for a 4 second trial for ignition Ignitor...

Страница 27: ...G SPEED LED 1 SLOW FLASH LED 2 OFF GAS VALVE OFF COMBUSTION AIR BLOWER OFF INDOOR BLOWER OFF WITH DELAY LED 1 OFF LED 2 SLOW FLASH Sequence holds until pressure switch closes or thermostat resets cont...

Страница 28: ...TO SENSE FLAME FOR FIVE CONSECUTIVE TRIES DURING A SINGLE HEAT DEMAND IGNITION WATCHGUARD MODE GAS VALVE OFF COMBUSTION AIR INDUCER OFF INDOOR BLOWER OFF WITH DELAY LED 1 ALT SLOW FLASH LED 2 ALT SLO...

Страница 29: ...CHANGED THROUGHOUT COOLING CYCLE THERMOSTAT CALLS FOR COOLING COMPRESSOR CONTACTOR AND SYSTEM FAN ENERGIZED WITH 0 SECOND DELAY ACB COOL SPEED AND ACC TERM ENERGIZED COMPRESSOR OFF THERMOSTAT OPENS AC...

Страница 30: ...Y THERMOSTAT OPENS COMBUSTION AIR AND HTG ACC TERMINAL DE ENERGIZE SYSTEM FAN SWITCHED TO ACB COOL SPEED ACC TERM REMAINS ON THERMOSTAT OPENS BOARD 63K89 SYSTEM FAN OFF ACC TERM OFF AFTER OFF DELAY CO...

Страница 31: ...ch open ACTION 1 Manually reset the roll out switch by pushing the top button ACTION 2 Determine the cause of the roll out switch activation before leaving furnace out code LED 1 O 1 2 2 Roll out swit...

Страница 32: ...ternating Fast Flash 2 1 2 Broken or failed ignitor ACTION 1 Unplug ignitor and read resis tance across ignitor If resistance does not read between 10 9 and 19 7 ohms replace the ignitor PROBLEM 3 UNI...

Страница 33: ...with a heating demand Diagnostic lights flash the pres sure switch failure code 2 5 min utes after heating demand 4 1 2 Pressure switch does not close due to obstructions in the pressure lines ACTION...

Страница 34: ...atisfying T stat demand Diagnostic lights flash the pres sure switch code LED 1 Off LED 2 Slow Flash 6 1 1 Low pressure differential at the pressure switch ACTION 1 Check for restricted vent inlet or...

Страница 35: ...rsootingdepositsoroth er restrictions in the heat exchanger assem bly Cleanassemblyasoutlinedininstruction manual ACTION 2 ForG24Mgasfurnaces checkfor proper combustion and flow CO2 should measurebetw...

Страница 36: ...ated ACTION 1 Check sense rod for contamina tion or coated surface Clean the sense rod with steel wool or replace sensor DO NOT USE SAND PAPER TO CLEAN ROD SAND PAPER WILL CONTRIBUTE TO THE CON TAMINA...

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