Service Guide - HVACpartners
Contents
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4. OPEN If open longer than three minutes code changes to 13 Flame roll out switch requires manual reset Check for Defective blower motor or capacitor Dirty filter or restricted duct system Loose blower wheel Defective switch or connections Inadequate combustion air supply Flame Roll out Switch or fuse link open Open Flame Roll out Switch or fuse link Manual reset or replace IGNITION PROVING FAILURE Control will try three more times before lockout 14 occurs If flame signal lost after trial for ignition period blower will come on for 90 second recycle delay Check for Oxide buildup on flame sensor clean with fine steel wool Proper flame sense microamps 5 microamps D C min 4 0 6 0 nominal Gas valve defective or gas valve turned off Defective Hot Surface Ignitor Manual valve shut off Low inlet gas pressure Control ground continuity Green wire MUST be connected to furnace sheet metal Inadequate flame carryover or rough ignition Flame sensor must be ungrounded COMPONENT TEST EN To initiate the component test sequence shut OFF the room thermostat or disconnect the R thermostat lead Briefly short the TEST terminal to the Com 24V terminal Status LED will flash code and then turn ON the inducer motor The inducer motor will run for the entire component test The hot surface ignitor blower motor heat speed and blower motor cool speed will be turned ON for 10 15 se
5. drill and gradually work cable out 4 Remove burner assembly and cell inlet plates CAUTION Be very careful when removing the burner assembly to avoid breaking the igniter See Fig 9 for the correct igniter location 10 11 12 5 Replace screws in center panel and cells before cleaning 6 Insert brush end of cable in lower opening of cell and proceed to clean 2 lower passes of cell in same manner as 2 upper passes 7 Repeat foregoing procedures until each cell in furnace has been cleaned 8 Remove residue from each cell using vacuum cleaner 9 Clean burner assembly using vacuum cleaner with soft brush attachment 10 Reinstall cell inlet plates and burner assembly Care must be exercised to center the burners in the cell openings After cleaning flue openings check sealant on flue collector to ensure that it has not been damaged If new sealant is needed contact your dealer or distributor Clean and replace flue collector assembly making sure all 8 screws are secure Reinstall relief box Reconnect wires to the following components a Draft safeguard switch b Inducer motor f c Pressure switch d Limit overtemperature switch es e Gas valve f Hot surface igniter g Flame sensing electrode 13 Reinstall vent connector on the furnace flue collar Reinstall the vent enclosure on downflow horizontal furnace onlly After fully assembling the vent connector to the furnace flue collar securely
6. during installation service or maintenance will cause this fuse to blow If fuse replacement is required use ONLY a fuse of identical size With power to the unit disconnected check all electrical connections for tightness Tighten all screws on electrical connections If any smoky or burned connections are found disassemble the connection clean all parts strip wire and reassemble properly and securely Reconnect electrical power to the unit and observe unit through 1 complete operating cycle Electrical controls are difficult to check without proper instrumentation if there are any discrepancies in the operating cycle contact your dealer and request service For an explanation of status codes refer to service label located on blower access door or Fig 13 and the troubleshooting guide The control stores 1 status code the last status to occur for a period of 48 hrs or until the 115 or 24 v power is interrupted NOTE Look into blower access door sight glass for current LED status Removing blower access door will open blower access door switch and terminate 115 v power to control and status code will be erased 1 To retrieve status code proceed with the following NOTE NO thermostat signal may be present at control and all blower time delay off periods must be completed a Leave 115 v power to furnace turned on b Look into blower access door sight glass for current LED status NOTE Leave blower access panel installed to main
7. electrical leads from control needed to permit control to be moved so that blower assembly can be removed from furnace See Fig 6 or 7 Note location of wires for reassembly Remove screws holding blower assembly to blower deck and slide blower assembly out of furnace Loosen screw in strap holding motor capacitor to blower housing and slide capacitor out from under strap Mark blower wheel motor and motor support in relation to blower housing before disassembly to ensure proper reassembly 4 10 11 12 13 14 15 A Loosen setscrew holding blower wheel on motor shaft Remove bolts holding motor mount to blower housing and slide motor and mount out of housing Disconnect ground wire attached to blower housing before removing motor Lubricate motor when oil ports are provided a Remove dust caps or plugs from oil ports located at each end of motor b Use a good grade of SAE 20 nondetergent motor oil and put 1 teaspoon 5 cc 3 16 oz or 16 to 25 drops in each oil port Do not over oil c Allow time for total quantity of oil to be absorbed by each bearing d Wipe excess oil from motor housing e Replace dust caps or plugs on oil ports Remove blower wheel from housing a Mark cutoff location to ensure proper reassembly b Remove screws holding cutoff plate and remove cutoff plate from housing c Lift blower wheel from housing through opening Clean blower wheel and motor using a vacuum c
8. fasten the vent connector to the collar with two field supplied corrosion resistant sheet metal screws located 180 apart and midway up the collar 14 Replace blower access door only 15 Turn on electrical power and gas 16 Set thermostat and check furnace for proper operation A WARNING Never use a match or other open flame to check for gas leaks Use a soap and water solution A failure to follow this warning could result in fire personal injury or death 17 Check for gas leaks 18 Replace control access door on upflow furnace 19 On downflow horizontal furnaces remove blower access door replace control access door first then replace blower access door and secure with 2 screws in front of door D Electrical Controls and Wiring AN CAUTION There may be more than 1 electrical supply to the unit Check accessories and cooling unit for additional electrical supplies and disconnects The electrical ground and polarity for 115 v wiring must be properly maintained Refer to Fig 10 for field wiring information and to Fig 12 for unit wiring information NOTE If the polarity is not correct the STATUS LED on the control center will flash rapidly and prevent the furnace from operating The control system also requires an earth ground for proper operation of the control and flame sensing electrode The 24 v circuit contains an automotive type 3 amp fuse located on the control See Fig 11 Any direct shorts of the 24 v wiring
9. in severe personal injury or death WARNING signifies a hazard which could result in personal injury or death CAUTION is used to identify unsafe practices which would result in minor personal injury or product and property damage NOTE is used to highlight suggestions which will result in enhanced installation reliability or operation N WARNING The ability to properly perform maintenance on this equipment requires certain expertise mechanical skills tools and equipment If you do not possess these do not attempt to perform any maintenance on this equipment other than those procedures recommended in the User s Manual FAILURE TO FOLLOW THIS WARNING COULD RESULT IN POSSIBLE DAMAGE TO THIS EQUIPMENT SERIOUS PERSONAL INJURY OR DEATH ELECTROSTATIC DISCHARGE ESD PRECAUTIONS PROCEDURE N CAUTION Electrostatic discharge can affect electronic components Take precautions during furnace installation and servicing to protect the furnace electronic control Precautions will prevent electrostatic discharges from personnel and hand tools which are held during the procedure These precautions will help to avoid exposing the control to electrostatic discharge by putting the furnace the control and the person at the same electrostatic potential 1 Disconnect all power to the furnace DO NOT TOUCH THE CONTROL OR ANY WIRE CONNECTED TO THE CONTROL PRIOR TO DISCHARGING YOUR BODY S ELECTROSTATIC CHARGE TO GROUND 2 Firmly touch a clean unpainted me
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13. NV FP AR ANAN J L en AIRFLOW X A98139 Fig 5 Downflow Filter Arrangement Table 1 Filter Size Information for Downflow Horizontal Furnaces In FILTER QUANTITY AND SIZE 2 14X20X 1 FILTER TYPE Cleanable 2 14 X 20X 1 Cleanable Cleanable 2 16 X 20 X 1 2 16 X 20 X 1 Cleanable FURNACE CASING WIDTH Table 2 Filter Size Information for Upflow Furnaces In FILTER QUANTITY AND SIZE Side Return 1 16 X 25 X 1 Bottom Return 1 14 X25 X 1 FILTER TYPE Cleanable 1 16 X 25 X 1 1 16 X 25 X 1 Cleanable 1 16 X25 X 1 1 20 X 25 X 1 Cleanable 2 16 X 25 X 1 1 24 X 25 X 1 Factory provided with the furnace Filter may be field modified as required by cutting to desired size A Air Filter Arrangement The air filter arrangement may vary depending on the application Refer to Table 1 or 2 for filter size information Cleanable A WARNING Never operate unit without a filter or with filter access door removed A failure to follow this warning could result in fire personal injury or death 1 Downflow Horizontal Each furnace requires 2 filters which are installed in the return air duct See Fig 4 and 5 To remove filters for cleaning or replacement proceed as follows a Disconnect electrical power before removing blower access door b Remove screw from fron
14. Service Guide Induced Combustion PG8DAA Gas Fired Furnaces PG8UAA Series B EFFICIENCY ea RATING 22 WIAA N CERTIFIED BIFX ama APPROVED S AS R e SGN TIE REGISTERED G SS A N QUALITY SYSTEM G s G S PSAN 22 sZ AC BIC 7 Ye YUU 4 97 SE g SS AS We ER ZSZ SSSSSSS A98143 A98144 A98145 Fig 1 Model PG8DAA Fig 2 Model PG8DAA Horizontal Fig 3 Model PG8UAA Downflow Upflow NOTE Read the entire instruction manual before performing any service or maintenance These procedures are for size 45 000 through 155 000 Btuh input units Index Page SAFETY CONSIDERATIONS 5 RH EHE EORR OE GERE IN TEE Gr Ubro epe devine ES E rte nn te ER Qa ia 1 2 ELECTROSTATIC DISCHARGE ESD PRECAUTIONS PROCEDURE 0 c esscsssssssessssserccersscsorscccessesssevaccsscseosscencusecgsesscoetanseesarocorescsarsseosers 2 CARE AND MAINTENANCE siii 2 13 Air Filter Ar O A E di 3 4 Blower Motor and Wheel 45 Cleaning Heat Exchanger 3 7 Electrical Controls and Wining T H P 7 8 TroubleshoOtHflg sassa n nas re REO RR REOR EU RERO EEUU USES usia cases DURER NM ls e ARIA EDS NEU Nes Furnace Wiring Diagram Nadal dm O Troubleshootins Guides
15. anges between heating and cooling Replace blower access door Secure with screw downflow horizontal furnace only C Cleaning Heat Exchanger The following steps should be performed by a qualified service technician NOTE Deposits of soot and carbon indicate the existence of a problem which needs to be corrected Take action to correct the problem If it becomes necessary to clean the heat exchanger because of carbon deposits soot etc proceed as follows Turn off gas and electrical power to furnace Remove screw from front of blower access door downflow horizontal furnace only and remove control and blower access doors 1 2 3 4 5 Remove internal vent pipe enclosure downflow horizontal furnace only and disconnect vent pipe from relief box Remove 2 mounting screws that secure relief box See Fig 6 or 7 Disconnect wires to the following components a Draft safeguard switch b Inducer motor Pressure switch a o Limit overtemperature switch es e Gas valve f Hot surface igniter g Flame sensing electrode Remove 8 screws that secure flue collector box to center panel Be careful not to damage sealant Remove complete inducer assembly from furnace exposing flue openings Clean cells using field provided small wire brush steel spring cable reversible electric drill and vacuum cleaner a Assemble wire brush and steel spring cable 1 Use 48 in of 1 4 in diameter high grade steel sp
16. conds each Gas Valve and Humidifier will not be turned on lolo o o HUM Com W R G sid 320615 102 REV K LIT Fig 13 Service Label i A99233 S euiul9 M919S 5 JO M 2e eubis 9e pz 0 puodsei jou seop 1 4 0HUO9 op d H IOnuoo y uo s euluu l 9 JO A M Je Juasaid ven yz S ejqeo B6uno uuoo4u lu JO yeJSOWAY WOO X09949 oeulnj 0 Jeyeaug PNO WO M u AJNUHUO 10 Y90949 pes o yoeq o6 pue Jexeaiq 1noJro 85019 pesojo Jeyea q yinoJro s HEIS 0 OB pue uoiiMs 100p 85019 peydnuejui si Apg 10 AG LL 4amod I A U UA 10 S14 8v Jaye posee ase sapos Snes uoneiedo y9ayo 0 ejo o Buijooo Jo Buneeu e ynom ueis s uny sjeu is je3souay 9eA pz 9 JO A M 01 puodsai 0 14U00 seog J19u1J0 SUe4 eoe deu U91MS Joop Ade day amp EYOUMS 0 BuioB AGL 3194 SI amp PESO O YAMS JOOP SI Ll ON uey 1810 epoo yne snolA81d e 3104 Sem 4988 988 G 0 10 uni IM peeds 1009 JOJO J3MO Q pue p ds jeay JOJOW 18MOIQ ISH 8ul 1159 jueuoduioo unu y 10 uni pue Yes IIM 1aonpul ay aouenbas sa jueuodu09 jeuq e yBnoiu OB m onuo2 eu saw epoo eu syeedei 01 U09 ay Jay UNEL snoad ou y ysey Buoj pue OUS LL ON 9poo eu 10 ynej snoad Aue jo epoo snje s ay ysey m q31 mo seo6 q31 eui gun euw O eu pue BULLE 1831 eui Buiuous Aluelu uuouu Aq ne snoi aJd 1
17. cuidan o rp rd Een eniin ecciesia c ced testis bai E rere E HERPES S Id sS SAFETY CONSIDERATIONS Installing and servicing heating equipment can be hazardous due to gas and electrical components Only trained and qualified personnel should install repair or service heating equipment Untrained personnel can perform basic maintenance functions such as cleaning and replacing air filters All other operations must be performed by trained service personnel When working on heating equipment observe precautions in the literature on tags and on labels attached to or shipped with the unit and other safety precautions that may apply Follow all safety codes including local building codes the National Fuel Gas Code NFGC ANSI Z223 1 1996 NFPA 54 1996 in the United States and the National Standard of Canada Natural Gas and Propane Installation Codes NSCNGPIC CAN CGA B149 1 and 2 M95 in Canada Wear safety glasses and work gloves Have fire extinguisher available during start up and adjustment procedures and service calls Form SG PG8D 04 Cancels SG PG8D 03 Printed in U S A 6 99 Catalog No 53PG 8D12 Recognize safety information This is the safety alert symbol N When you see this symbol on the furnace and in instructions or manuals be alert to the potential for personal injury Understand the signal words DANGER WARNING and CAUTION These words are used with the safety alert symbol DANGER identifies the most serious hazards which will result
18. e WeS S LNONIOT NOILINOI ge ON ees 958 jenuew sau nba yoyIms jnoj o1 eure J siu Jaye inooo M jese1 ojny s lnului g uey JeBuo uedo sem uos Hu 1003201 HOLIMS LNOTI04 3AV14 HO LINN pasop M H easy 10 eo e Buunp peidnuejur SI Jamod e2euinj uaym S 06 10 uni M J3MO g uoneiedo JeuuoN AvZ HO ASLL dn H3MOd H3 ldV NO H3MO 18 Ulejs s 49949 01 21949 Bui009 Jo Buneeu e ubnouui uiejs s uny peidnuejur SI AZ 10 AS Jamod Jangusym JO SIy gy Jaye paseja ae Syne4 LINVA SnOIA3Hd ON 15 1999 Payne Heating amp Cooling P O Box 70 Indianapolis IN 46206 16 sgpg8d04 Catalog No 53PG 8D12
19. erosol cans rags brooms dust mops vacuum cleaners or other cleaning tools 2 Soap powders bleaches waxes or other cleaning compounds plastic or plastic containers gasoline kerosene cigarette lighter fluid dry cleaning fluids or other volatile fluids 3 Paint thinners and other painting compounds paper bags or other paper products A failure to follow this warning could result in corrosion of the heat exchanger fire personal injury or death N WARNING Turn off the gas and electrical supplies to the unit before performing any maintenance or service Follow the operating instructions on label attached to furnace A failure to follow this warning could result in personal injury The minimum maintenance that should be performed on this equipment is as follows 1 Check and clean air filter each month or more frequently if required Replace if torn 2 Check blower motor and wheel for cleanliness each heating and cooling season Clean as necessary 3 Check electrical connections for tightness and controls for proper operation each heating season Service as necessary AN CAUTION As with any mechanical equipment personal injury can result from sharp metal edges etc therefore be careful when removing parts NE NS AIRFLOW A94307 Fig 4 Horizontal Filter Arrangement FURNACE CASING WIDTH INSTALLATION POSITION OF FILTERS RETURN AIR PLENUM ACCESS DOOR Esa ZS ARGS Bwe B N Z
20. ide filter s out e Furnaces are equipped with permanent washable filters Clean filters with tap water Spray water through filter in opposite direction of airflow Rinse and let dry Oiling or coating of filter is not recommended or required Reinstall filter s Replace blower access door Ems m me Restore electrical power to furnace B Blower Motor and Wheel For long life economy and high efficiency clean accumulated dirt and grease from the blower wheel and motor annually The following steps should be performed by a qualified service technician Some motors have prelubricated sealed bearings and require no lubrication These motors can be identified by the absence of oil ports on each end of the motor For those motors with oil ports lubricate motor every 5 years if motor is used on intermittent operation thermostat FAN in AUTO mode or every 2 years if motor is in continuous operation thermostat FAN in ON mode NOTE Remember to disconnect the electrical supply before removing access doors Clean and lubricate as follows 1 mn Remove screw from blower access door downflow horizontal furnace only and remove blower access door Downflow Horizontal furnace only Remove vent pipe enclosure and disconnect short piece of vent pipe from relief box 2 3 4 5 Downflow Horizontal furnace only Disconnect wires from auxiliary limit on blower housing Remove control Disconnect only those
21. leaner with soft brush attachment Do not remove or disturb balance weights clips on blower wheel blades The blower wheel should not be dropped or bent as balance will be affected Reinstall blower wheel by reversing items 12 a through c Be sure wheel is positioned for proper rotation Reassemble motor and blower by reversing items 5 through 10 Be sure motor ground wire is connected as before CAUTION Be sure the motor is properly positioned in the blower housing The motor oil ports in downflow and upflow furnaces must be at a minimum of 45 above the horizontal centerline of the motor after the blower assembly has been reinstalled in the furnace 16 17 18 19 20 21 Reinstall blower assembly in furnace Reinstall control Connect blower electrical leads to control Please note that the common wire connection is a 3 16 in quick connect terminal and all other wire connections are 1 4 in for assembly DO NOT FORCE Reconnect wires to auxiliary limit switch on blower housing downflow horizontal furnace only Reinstall vent connector on the furnace flue collar Reinstall the vent enclosure on downflow horizontal furnace only After fully assembling the vent connector to the furnace flue collar securely fasten the vent connector to the collar with two field supplied corrosion resistant sheet metal screws located 180 apart and midway up the collar Turn on electrical power and check for proper rotation and speed ch
22. lly closing this switch for service purposes Failure to follow this warning could result in personal injury or death d BRIEFLY short jumper TEST 1 4 in quick connect terminal on control adjacent to LED diagnostic light and Com 24v terminal on furnace thermostat connection block See Fig 11 NOTE If TEST to Com 24v terminals are jumpered longer than 2 sec LED will flash rapidly and retrieval request will be ignored e Component Test will function as described in item 2 above f Check LED status g If LED status indicates proper operation release blower access door switch replace blower access door and replace control access door E Troubleshooting Refer to the service label See Fig 13 Pages 12 and 13 contain a troubleshooting guide This guide can be a useful tool in isolating furnace operation problems Beginning with the word Start answer each question and follow the appropriate arrow to the next item The guide will help to identify the problem or failed component After replacing any component verify correct operation sequence 8 FIELD 24 V WIRING FIELD 115 208 230 460 V WIRING FACTORY 24 V WIRING FACTORY 115 V WIRING NOTE 2 THERMOSTAT FIVE DO TERMINALS FIELD SUPPLIED WIRE I DISCONNECT ESSE THREE WIRE e e ER HEATING
23. ring cable commonly known as drain clean out or Roto Rooter cable EN C 13 55 11 32 S I N _ H i YA CELL a PANEL E Pul HOT SURFACE IGNITER ASSEMBLY f fa J I N N IGNITER o 7 3 BURNER q IGNITER ASSEMBLY A91252 A93347 Fig 8 Cleaning Heat Exchanger Cell Fig 9 Position of Igniter to Burner 2 Use 1 4 in diameter wire brush commonly known as 25 caliber rifle cleaning brush NOTE The materials needed in items 1 and 2 can usually be purchased at local hardware stores A 3 Insert twisted wire end of brush into end of steel spring cable and crimp tight with crimping tool or strike with ball peen hammer TIGHTNESS is very important 4 Remove metal screw fitting from wire brush to allow insertion into cable b Clean each heat exchanger cell 1 Attach variable speed reversible drill to end of steel spring cable end opposite brush 2 Insert brush end of cable into upper opening of cell and slowly rotate with drill DO NOT force cable Gradually insert at least 36 in of cable into 2 upper passes of cell See Fig 8 3 Work cable in and out of cell 3 or 4 times to obtain sufficient cleaning DO NOT pull cable with great force Reverse
24. sn nahm Dm B Sud Sd91 EL 3LON EIHFLON Y y ay Si LK JON Q RUE N3HM WE TS ZHHZALON 2544 sta goss reas 9 3ION Ina y O aie GANNOH9 LNAWdINOA Y v ALON LOANNOOSIC Q l3 WASHL OL GNvdOHd 9 SVD TVHNLVYN AvVH9VIQ OLLVWAHOS WHLNAN Sd91 Sud SW sn NIHM LESION qasn N3HW TA EN EIE NHO NHO NEO NHO SSNa vL LON Sn N3HM NIML 1S31 WNH Pa nog mo M IMS aa A u HHI 6 ILON EES OAS SZZ 23S 081 O3S SEL E 938 06 Ss l J JHVHO NOLLO HS AV EG 440 H3MO 18 GN3S41 SERVICE If status code recall is needed do not remove power or blower door Briefly remove and then reconnect one main limit wire to display stored status code LED CODE STATUS CONTINUOUS OFF Check for 115VAC at L1 and L2 and 24VAC at SEC 1 and SEC 2 CONTINUOUS ON Control has 24VAC power RAPID FLASHING Line voltage 115VAC polarity reversed If twinned refer to twinning kit instructions EACH OF THE FOLLOWING STATUS CODES IS ATWO DIGIT NUMBER WITH THE FIRST DIGIT DETERMINED BY THE NUMBER OF SHORT FLASHES AND THE SECOND DIGIT BY THE NUMBER OF LONG FLASHES NO PREVIOUS CODE Stored status codes are erased when power 115VAC or 24VAC to control is interrupted or 48 hours after each faul
25. t is cleared BLOWER ON AFTER POWER UP 115VAC or 24 VAC Blower runs for 90 seconds if unit is powered up during a call for heat R W closed LIMIT OR FLAME ROLL OUT SWITCH LOCKOUT Control will auto reset after three hours Reset switch or replace fuse link Refer to 33 IGNITION LOCKOUT Control will auto reset after three hours Refer to 34 GAS HEATING LOCKOUT Control will NOT auto reset Check for Mis wired gas valve Defective control Valve relay ABNORMAL FLAME PROVING SIGNAL Flame is proved while gas valve is de energized Inducer will run until fault is cleared Check for Leaky gas valve Stuck open gas valve PRESSURE SWITCH DID NOT OPEN Check for Obstructed pressure tubing Pressure switch stuck closed SECONDARY VOLTAGE FUSE IS OPEN Check for Short circuit in secondary voltage 24VAC wiring PRESSURE DRAFT SAFEGUARD AUX LIMIT SWITCH when used OR BLOCKED VENT SWITCH when used DID NOT CLOSE OR REOPENED DOWNFLOW ONLY If open longer than five minutes inducer shuts off for 15 minutes before retry Check for Proper vent sizing Low inducer voltage 115VAC Defective inducer motor Defective Blower motor or capacitor Restricted vent Defective pressure switch Excessive wind Inadequate combustion air supply Disconnected or obstructed pressure tubing If it opens after trial for ignition period blower will come on for 90 second recycle delay LIMIT OR FLAME ROLL OUT SWITCH IS
26. t of door and remove blower access door c Reach up behind top plate tilt filters toward center of return air plenum remove filters and clean as needed Replace if torn d Furnaces are equipped with permanent washable filters Clean filters with tap water Spray water through filter in opposite direction of airflow cc MOUNTING DRAFT VENT PIPE SCREWS SAFEGUARD i ENCLOSURE SWITCH AUXILIARY i NUM WITCH is WHEN USED 74 FLUE E LLECTOR MOUNTING CONTROL BOX FOTO SCREWS BOARD GAS RELIEF VALVE LIEF CONTROL SAFEGUARD GAS SWITCH VALVE FILTER RETAINER MANUAL WASTIABLE RESET LIMIT EIER SWITCHES A98210 A98211 Fig 6 Model PG8UAA Upflow Fig 7 Model PG8DAA Downflow e Rinse and let dry Oiling or coating of filters is not recommended or required f Reinstall filters g Replace blower access door h Restore electrical power to furnace Upflow Each furnace requires 1 or 2 filters which are installed in the side and or bottom of blower compartment See Fig 6 To remove filters for cleaning or replacement proceed as follows a Disconnect electrical power before removing access doors b Remove blower and control access doors c Release filter retainer from clip at front of furnace casing See Fig 6 For side return clips may be used on either or both sides of the furnace d Sl
27. tain power to control to view current LED status c Remove control access door d BRIEFLY remove either wire from the main limit switch until LED goes out then reconnect it NOTE If wire to main limit is disconnected longer than 4 sec main blower starts and retrieval request is ignored 2 When above items have been completed the following will occur a LED flashes a status code 4 times Record this status code for further troubleshooting b Inducer motor starts and continues to run the entire component test c Hot surface igniter is energized for 15 sec then de energized d Main blower operates at cooling speed for 10 sec then turns off e Main blower operates at heating speed for 10 sec then turns off f Inducer motor stops Items a through e above will assist in furnace troubleshooting since all components are functionally operated except the gas valve This procedure is also referred to as Component Test 3 Operate furnace through 1 heat cycle to test for proper operation and check LED status 4 If furnace is operating properly and LED indicates proper operation replace control access door NE am 5 Component Test can also be initiated by performing the following a Remove control access door b Remove blower access door c Manually close blower access door switch A WARNING Blower access door switch opens 115 v power to control center No component operation can occur Caution must be taken when manua
28. tal surface of the furnace chassis which is close 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 static electricity firmly touch furnace again before touching control or wires 5 Use this procedure for installed and uninstalled ungrounded furnaces 6 Before removing a new control from its container discharge your body s electrostatic charge to ground to protect the control from damage If the control is to be installed in a furnace follow items 1 through 5 before bringing the control or yourself into contact with the furnace Put all used AND new controls into containers before touching ungrounded objects 7 An ESD service kit available from commercial sources may also be used to prevent ESD damage CARE AND MAINTENANCE For continuing high performance and to minimize possible equipment failure it is essential that periodic maintenance be performed on this equipment Consult your local dealer as to the proper frequency of maintenance and the availability of a maintenance contract N WARNING Never store anything on near or in contact with the furnace such as 1 Spray or a
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