Lennox 80UHG Series Скачать руководство пользователя

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Page 26

HEATING SEQUENCE CONTINUED

NORMAL HEATING MODE

ABNORMAL HEATING MODE

FLAME RECTIFICATION CURRENT

CHECK. CAN FLAME BE PROVEN WITHIN

4 SECONDS AFTER GAS VALVE OPENS?

(

0.15 microamps)

FLAME PRESENT?

INDOOR BLOWER ON DELAY BEGINS

(45 seconds.)

PRIMARY AND SECONDARY LIMIT

SWITCHES CLOSED?

COMBUSTION AIR PRESSURE

SWITCH CLOSED?

LOW FLAME SIGNAL

(Does not affect operation of control)

LED #1 −− SLOW FLASH

LED #2 −− FAST FLASH

GAS VALVE DE−ENERGIZED.

COMBUSTION AIR INDUCER DE−ENERGIZED.

INDOOR BLOWER ON UNTIL SWITCH CLOSES.

LED #1 −− SLOW FLASH. LED #2 −− ON.

IS LIMIT SWITCH CLOSED?

GAS VALVE DE−ENERGIZED.

COMBUSTION AIR INDUCER ON.

INDOOR BLOWER OFF WITH DELAY

LED #1 −− OFF. LED #2 −− SLOW FLASH.

HAS CAB SWITCH CLOSED IN 2.5 MINUTES?

158SECOND COMBUSTION AIR INDUCER PREPURGE

INITIATED BY CLOSED PRESSURE SWITCH.

YES

IGNITOR WARM8UP −− 20 SECONDS.

YES

48SECOND TRIAL FOR IGNITION.

GAS VALVE OPENS. IGNITOR ENERGIZED FOR 1

SECOND AFTER VALVE OPENS. CONTROL

10M9301: IGNITOR ENERGIZED DURING TRIAL

UNTIL FLAME SENSED.

YES

FLAME STABILIZATION PERIOD.

GAS VALVE OFF. COMBUSTION AIR INDUCER ON.

INDOOR BLOWER OFF.

HAS CONTROL FAILED TO SENSE FLAME FOR

FIVE CONSECUTIVE TRIES DURING A SINGLE

HEAT DEMAND?

WATCHGUARD MODE. GAS VALVE OFF.

COMBUSTION AIR INDUCER OFF.

INDOOR BLOWER OFF WITH DELAY

LEDs SIGNAL WATCHGUARD FAILURE CODE.

IS 608MINUTE RESET PERIOD COMPLETE?

YES

4 SECONDS

YES

HAS CONTROL RESET IGNITION

SEQUENCE FOUR TIMES?

FLAME SIGNAL ABOVE 0.2 MICROAMPS?

YES

ROLLOUT SWITCH CLOSED?

GAS VALVE POWER OFF.

COMBUSTION AIR INDUCER POWER ON.

INDOOR BLOWER ON

LED #1 −− ON. LED #2 −− SLOW FLASH.

SEQUENCE HOLDS UNTIL ROLLOUT SWITCH IS RESET

AND MAIN POWER IS INTERUPTED OR

THERMOSTAT IS CYCLED OFF/ON FOR 1 TO 20 SEC.

YES

THERMOSTAT DEMAND SATISFIED.

LED #1 & #2 SIMULTANEOUS SLOW FLASHES.

COMB. AIR INDUCER CONTINUES 58SECOND

POST PURGE AFTER T’STAT DEMAND IS SATISFIED.

INDOOR AIR BLOWER COMPLETES SELECTED

KOFF" DELAY BEFORE SHUTTING OFF.

YES

58MINUTE PRESSURE SWITCH

WATCHGUARD MODE.

YES

IS THERE A PROPER GROUND?

IS VOLTAGE ABOVE 75 VOLTS?

IS IGNITOR INTACT AND CONNECTED?

LEDS SIGNAL

ALTERNATING

FAST FLASH

YES

HAS PRIMARY SECONDARY

LIMIT RESET (CLOSED)

WITHIN 3 MINUTES?

LIMIT SWITCH

WATCHGUARD

MODE. GAS VALVE

OFF. COMB. AIR

INDUCER OFF.

INDOOR BLOWER

OFF WITH DELAY.

LED#1−SLOW

FLASH LED#2− ON.

IS 60−MINUTE

RESET PERIOD

COMPLETE?

Содержание 80UHG Series

Страница 1: ...itrogen Oxides NOx Standards and California Sea8 sonal Efficiency requirements All units use a redundant gas valve to assure safety shut off as required by A G A or C G A Units may be installed in upf...

Страница 2: ...46J66 15 lbs 8 kg SPECIFICATIONS Model No 80UHG3 4 X 100 80UHG4 5 X 100 80UHG3 4 X 120 80UHG4 5 X 120 Input Btuh kW 100 000 29 3 120 000 35 2 Output Btuh kW 82 000 24 0 98 400 28 8 A F U E 80 1 80 0...

Страница 3: ...375 20 50 1370 645 1180 555 980 460 790 375 25 62 1350 635 1160 545 970 460 780 370 30 75 1330 630 1140 540 955 450 770 365 40 100 1280 605 1095 515 925 435 750 355 50 125 1210 570 1040 490 900 425 72...

Страница 4: ...lace Also see Filter Air Resistance table FILTER AIR RESISTANCE cfm L s in w g Pa 0 0 0 00 0 200 95 0 01 2 400 185 0 03 7 600 280 0 04 10 800 375 0 06 15 1000 470 0 09 22 1200 560 0 12 30 1400 655 0 1...

Страница 5: ...BOX SECONDARY LIMITS FRONT ACCESS PANEL DOOR INTERLOCK SWITCH CONTROL BOARD TRANSFORMER PROVE SWITCH 80UHG PARTS IDENTIFICATION FIGURE 2 HEAT EXCHANGER COMBUSTION AIR INDUCER MANIFOLD ROLLOUT SWITCH...

Страница 6: ...protect the furnace s electronic controls Precautions will help to avoid control exposure to electrostatic dis charge by putting the furnace the control and the technician at the same electrostatic po...

Страница 7: ...be open the combustion air inducer is energized When the differ8 ential in the prove switch is great enough the prove switch closes and a 15 second pre purge begins If the prove switch is not proven...

Страница 8: ...ed OR Pressure switch closed prior to activation of combustion air blower ALTERNATING SLOW FLASH ALTERNATING SLOW FLASH Watchguard burners fail to ignite SLOW FLASH OFF Flame sensed without gas valve...

Страница 9: ...nal is sensed NOTE The 80UHG furnace contains electronic components that are polarity sensitive Make sure that the furnace is wired correctly and is properly grounded PARK TERMINAL DESIGNATIONS COOL H...

Страница 10: ...ts If the primary or secondary heating limits open the control de energizes the main gas valve and combustion air blower while the indoor blower remains en ergized When the limit automatically resets...

Страница 11: ...is a heating demand On Flash Primary or Secondary Limit Switch Open Auto Reset Switch Flash Off Pressure Switch Watchguard pressure switch opened during operation Alternate Flash Alternate Flash Watch...

Страница 12: ...P 1 2 1 3 1 4 5MFD 370V 5MFD 370V 7 5MFD 370V 80UHG5 6 80UHG4 80UHG4 5 1 2 7 5MFD 370V 3 4 40MFD 370V 3 4 40MFD 370V FIGURE 11 SUPPLY AIR BLOWER AND SECONDARY LIMITS Front Bottom Right Left Top Back B...

Страница 13: ...t point will be printed on the limit Two limits are supplied in each furnace 80UHG3 80UHG4 and 80UHG4 5 model units built prior to Apri 1999 will have one each of style shown in figures 13 and 14 If s...

Страница 14: ...ODEL SHOWN FIGURE 18 SPARK ELECTRODE SPARK ELECTRODE TO BURNER GAP 80UHG 1 MODEL SHOWN BURNER FLAME SENSOR TO BURNER GAP BURNER FLAME SENSOR SPARK ELECTRODE 5 16 in 7 mm 5 16 in 7 mm 13 Combustion Air...

Страница 15: ...ard 80UHG 1 units are equipped with a direct spark igni tion system Do not attempt to light manually 1 STOP Read the safety information at the beginning of this section 2 Set thermostat to lowest sett...

Страница 16: ...to check for gas leaks D Testing Gas Supply Pressure When testing supply gas pressure connect test gauge to inlet pressure tap field provided See figure 20 Check gas line pressure with unit firing at...

Страница 17: ...roamp DC meter is needed to check the flame signal on the ignition control Flame microamp signal is an electrical current which passes from the furnace control through the sensor during unit opera tio...

Страница 18: ...mperature is too low decrease blower speed If temperature is too high first check the firing rate Provided the firing rate is acceptable in crease blower speed to reduce temperature To change blower s...

Страница 19: ...in the heat exchanger clean ing is not recommended Removal is for inspection only NOTE Use papers or protective covering in front of fur nace while cleaning furnace To clean burners 1 Remove screws ho...

Страница 20: ...ting in gas leaks fire or explosion C Supply Air Blower 1 Check and clean blower wheel 2 Motors used on the Lennox 80UHG series units are permanently lubricated and need no further lu brication D Flue...

Страница 21: ...n control energizes the combustion air inducer B6 When the combustion air inducer nears full speed combustion air prove switch S18 closes Switch must close within 2 1 2 minutes or control goes into 5...

Страница 22: ...OR BLOWER WITH DELAY OFF DIAG CODE 1 OFF 2 FLASHING C A B PRESSURE SWITCH OPEN IS 5 MINUTE RESET PERIOD COMPLETE INDOOR AIR BLOWER ON Fixed 45 second delay PRIMARY SECONDARY LIMITS MONITORED IN HEAT C...

Страница 23: ...RMOSTAT CONTROL ENERGIZES SYSTEM FAN AT HEATING SPEED ACC TERMINAL ENERGIZED THERMOSTAT CALLS FOR HEAT LED Slow flash rate REMAINS UNCHANGED THROUGHOUT SEQUENCE THERMOSTAT CALLS FOR COOLING SYSTEM FAN...

Страница 24: ...hguard 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 i...

Страница 25: ...AS VALVE OFF COMBUSTION AIR INDUCER ON INDOOR BLOWER ON HEATING SPEED LED 1 SLOW FLASH LED 2 OFF GAS VALVE OFF COMBUSTION AIR INDUCER OFF INDOOR BLOWER OFF WITH DELAY LED 1 OFF LED 2 SLOW FLASH Sequen...

Страница 26: ...CONTROL FAILED TO SENSE FLAME FOR FIVE CONSECUTIVE TRIES DURING A SINGLE HEAT DEMAND WATCHGUARD MODE GAS VALVE OFF COMBUSTION AIR INDUCER OFF INDOOR BLOWER OFF WITH DELAY LEDs SIGNAL WATCHGUARD FAILU...

Страница 27: ...D SLOW FLASH RATE REMAINS UNCHANGED THROUGHOUT COOLING CYCLE THERMOSTAT CALLS FOR COOLING COMPRESSOR CONTACTOR AND SYSTEM FAN ENERGIZED WITH 0 SECOND DELAY COOLING SPEED EAC H TERM ENERGIZED COMPRESSO...

Страница 28: ...THERMOSTAT CALLS FOR HEAT W THERMOSTAT CALLS FOR COOLING THERMOSTAT OPENS SYSTEM FAN SWITCHED TO COOL H SPEED EAC H TERM REMAINS ON THERMOSTAT OPENS MANUAL FAN SELECTION MADE AT THERMOSTAT CONTROL G...

Страница 29: ...he roll out switch by pushing the top button ACTION 2 Determine the cause of the roll out switch activation before leaving furnace code 1 2 2 Roll out switch failure ACTION 1 Check continuity across r...

Страница 30: ...WER DOES NOT ENERGIZE Condition Possible Cause Corrective Action Comments 2 1 Unit operates with a cooling or con tinuous fan demand Combustion air inducer will not start with a Heating demand Diagnos...

Страница 31: ...e pressure switch failure code 2 5 minutes after heating demand 3 1 2 Pressure switch does not close due to obstructions in the pressure lines ACTION 1 Remove any obstructions from the the pressure li...

Страница 32: ...ch code LED 1 Off LED 2 Slow Flash 5 1 1 Low pressure differential at the pres sure switch ACTION 1 Check for restricted exhaust vent Remove all blockage ACTION 2 Check for proper vent sizing See inst...

Страница 33: ...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 openings Cor rect the location of the burners if necessary 5 4...

Страница 34: ...Action Comments 7 0 Indoor blower fails to operate in continuous fan cooling or heating mode 7 1 1 Miswiring of furnace or improper con nections at control or indoor blower motor ACTION 1 Correct wir...

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