Gamages 58DHB User's Manual
Contents
1. 0 WO PMN UQ 0 O0 O 0 WD 00 0 Wm hon on Provides a 30 in service clearance in front of the furnace tIndicates supply or return sides when furnace is in the horizontal position Table 2 Dimensions in MODEL 58DHB ie a a VENT CONN 040 100BC 4 055 100BC 4 055 100CC 4 075 1008C 17 15 16 4 075 100cC 174 15 16 4 095 100CC 17 15 16 4 095 100DC i a o 4 z Table 3 Ratings and Performance MODEL INPUT CAPACITY Ext Static Ext Static MOTOR SHIP 58DHB Btuh Btuh RANGE F Pressure Pressure HP PSC WT Ib in we in we aag 008 130 055 1008C 140 055 1006 ma 075 100BC 1010 160 075 1006 163 095 1000C 178 095 1000C 788 PSC Permanent Split Capacitor The above gas inputs are certified for altitudes to 2000 feet For elevations above 2000 ft reduce input 4 for each 1000 ft above sea level Determined by US Government tests DEPTH HOLE IN FLOOR Fig 4 Floor Opening for Concrete Slab Fig 6 Accessory Combustible Floor Base Table 4 Opening Dimensions in FURNACE CASING W H ee ae EE Heat Only COMBUSTIBLE FURNACE FLOOR BASE OR COIL CASING WHEN USED ap MMM CSA AASNASASSAY FURNACE Fig 7 Furnace Plenum and Base Installed on Combustible Floor Fig 5 Furnace ona Concrete Slab INSTALL FURNACE 1 Position furnace in desired location NOTE For attic or concealed installation2. V formation inside return air plenum See Fig 10 and Table 5 for horizontal applications See Fig 11 for downflow applications A WARNING Never operate unit without a filter or with filter access door removed Electrical Connections LINE VOLTAGE WIRING IMPORTANT Before proceeding with electrical connections make certain that voltage frequency and phase correspond to that specified on unit rating plate Also check to be sure that service provided by utility is sufficient to handle additional load imposed by this equipment Refer to unit rating plate for equipment electrical requirements TWO WIRE HEATING ONLY FIELD SUPPLIED DISCONNECT PER N EC AUXILIARY JUNCTION BOX LOW VOLTAGE TERMINAL STRIP A CAUTION Do not connect aluminum wire between disconnect switch and furnace Make all electrical connections in accordance with National Electrical Code ANSI NFPA 70 1984 and any local codes or ordinances that apply See Fig 12 for wiring diagram showing proper field high and low voltage wiring Use separate fused branch electrical circuit containing proper fuse or HACR Heating Air Conditioning and Refrigeration type circuit breaker for this furnace A disconnecting means must be located within sight from and easily accessible from the furnace Blower door switch may be acceptable in some areas as a disconnect A WARNING Furnace must be electrically grounded in accordance with local
3. housing NOTE For ease of blower removal it may be neces sary to remove control box on some sizes 5 Remove blower assembly from furnace Remove motor from blower housing 7 Lubricate motor using good grade of SAE 20 non detergent motor oil Put one teaspoon Scc 3 16 oz or 16 to 25 drops in each oil port 8 Remove blower wheel from housing and clean by using vacuum with soft brush attachment Be careful ON Fig 17 Dual Blower with Left Hand Housing and Wheel Removed MOE 1S not to disturb balance weights clips on blower wheel vanes A CAUTION Be sure motor is properly positioned in blower housing Motor oil ports must be ata minimum of 45 above horizontal centerline of motor after blower assembly has been reinstalled in furnace 9 Reassemble furnace by reversing above procedures When more detailed servicing procedure is required see furnace Service Manual available from dealer Cleaning Heat Exchanger NOTE Deposits of soot and carbon indicate that a prob lem exists Action must be taken to correct the problem To clean heat exchanger of carbon deposits soot etc 1 Turn off gas and power to furnace 2 Remove control and blower access doors 3 Remove vent pipe enclosure and disconnect vent pipe from relief box 4 Remove 4 screws that secure relief box to blower shelf 5 Disconnect 2 wires from safeguard switch 6 Disconnect wire harness edge connector from s
4. DIAL Fig 16 Redundant Automatic Gas Essex 345 Control Valve Minimum Maintenance Requirements 1 Check and clean or replace air filter each month or as required 2 Check blower motor and wheel for cleanliness and lubrication each heating and cooling season Clean and lubricate as necessary 3 Check electrical connections for tightness and controls for proper operation each heating season Service as necessary A WARNING As with any mechanical equipment personal injury can result from sharp metal edges etc Be careful when removing parts Air Filter Each furnace accommodates 2 filters which are installed in return air duct See Fig 10 and 11 To clean or replace filters 1 Disconnect electrical power before removing access panel 2 Remove upper access panel 3 Reach up behind top plate tilt filters toward center of return air plenum remove filters Replace or clean as needed 4 Furnaces are equipped with permanent washable filters Clean filters as follows a Clean with tap water b Rinse and let dry No oiling or coating of filters is required c Reinstall filters with cross hatch binding facing blower NOTE The following steps should be performed by a qualified service person Blower Motor Wheel Remove blower access panel 2 Remove vent pipe enclosure 3 Disconnect vent pipe and remove short piece of pipe from furnace 4 Disconnect wires from auxiliary limit on blower
5. S8DHB Downflow Horizontal Induced Combustion Furnaces NG Installation Start Up and Service Instructions for Sizes 040 115 100 Series RS a EFFICIENCY RATING CERTIFIED IMPORTANT Induced combustion furnaces require special installation techniques Follow these instructions carefully The design of the downflow horizontal Fig 1 and 2 gas fired furnace is AGA certified for natural and pro A CAUTION pane gas installation on combustible flooring with optional floor base in alcoves attics crawl spaces Do not connect this furnace to a chimney flue basements closets or utility rooms The design of this serving a separate appliance designed to burn furnace line is not AGA certified for installation in solid fuel per American National Standard Z21 476 mobile homes recreation vehicles or outdoors 1986 National Fuel Gas Code GENERAL Before starting installation of this furnace read these instructions carefully and completely After installation is complete remove the Energy Guide tag from the furnace Also read the Procedures for Induced Combustion Gas Fired Furnaces packaged with furnace for important information concerning combustion venting piping and other standard installation practices Further reference can be made to the current edition of the American National Standard 2223 1 National Fuel Gas Code The induced combustion vent system of this furnace is designed to operate
6. amp reading after blower motor has started Room thermostat should be located where it will be in natural circulation path of room air Avoid locations where thermostat would be exposed to cold air infiltra tion drafts from windows doors or other openings leading to outside or exposed to air currents from warm or cold air registers or to exposure where natural circulation of air is cut off such as behind doors above or below mantels shelves etc Thermostat should not be exposed to heat from nearby fireplaces radios televisions lamps or rays from sun Do not mount thermostat on a wall containing pipes warm air ducts or a flue or vent that could affect its operation Any hole in the plaster or panel through which thermostat wires pass should be adequately sealed with suitable material to prevent drafts from affecting thermostat BLOWER CONTROL CENTER Furnace features a blower control center This aids installer and service technician when installing and servicing unit A low voltage terminal board is marked for easy connection of field wiring See Fig 15 Sequence of Operation Refer to wiring diagram Fig 13 HEATING CYCLE 1 When blower door is in place 115 volts is supplied through blower door interlock switch 9G Trans former 1A is energized supplying 24 volts to heating blower relay coil 2E which opens normally closed blower relay contacts 2E in low speed circuit of blower motor 3D 2 Wall
7. codes and the National Electric Code ANSI NFPA 70 1984 Do not use gas piping as an electrical ground to avoid possibility of electric shock personal injury or death If line voltage wiring to unit is encased in non metallic sheath connect incoming ground wire to grounding wire inside furnace junction box If metallic conduit is used it will serve as ground LOW VOLTAGE WIRING Make field low voltage connections at low voltage terminal strip See Fig 12 NOTE Use American Wire Gage AWG No 18 color coded copper thermostat wire for lengths up to 100 feet Above 100 ft use AWG No 16 wire NOTE When the furnace is installed in the horizontal position with right hand discharge air low voltage wire connections can be made easier by removing the 2 control box mounting screws and letting the control box turn so that the low voltage screw terminals are visible Be sure to reinstall the control box after the connections are made FIELD SUPPLIED THERMOSTAT DISCONNECT PERNEC TERMINALS edt OF at at eat J CONDENSING THREE PHASE 7 SINGLE a PHASE A pia TWO WIRE UNIT Fig 12 Heating and Cooling Application Wiring Diagram 5 IMPORTANT The thermostat heat anticipator must be set to match amp draw of gas valve and elec trical components in R W circuit Accurate amp draw readings can be obtained at thermostat subbase terminals R and W Figure 14 illustrates an easy method of obtaining actual amp draw Take
8. Auxiliary Limit Switch SPST N C Manual Reset seeezeere Conductors on 6C2 inducer When Used Control Board 7V Flow Sensing Switch SPDT 9G Blower Door Interlock Switch Screw Terminal for Field Wiring SPST N O 10B1 Edge Connector Furnace C in Quick Connect Terminals Control Board 10B2 Edge Connector Inducer Control Board 7 CKT NOTES 1 T2 internally connected to equipment ground spark generator 6F mounting screws 2 Relay 2E contacts are normally closed until 120 VAC is applied to furnace 3 If any of the original wire as supplied must be replaced it must be replaced with AWM 105C wire or its equivalent 4 Blower motor 3D has a thermal overload switch 5 Blower motor 3D factory speed selections are for average conditions See instal lation instructions for details on optimum speed selection Motor may have 3 or 4 speed taps Use copper wire only between the disconnect switch and the unit Symbols are an electrical representation only Pressure switch 7P is used for propane only spake link usage One required on uptiow and 2 required on downflow horizontal urnace Lockout module 6C8 is used for propane or 100 shutoff natural gas Two amp fuse in secondary or transformer for Canadian units only 0 COND os gt Fig 13 Line to Line Wiring Diagram THERMOSTAT TERMINALS CLAMP ON VOLT AMME TER FROM UNIT LOW VOLTAGE TERMINAL BLOCK OF FURNACE 5 0 AMPS ON AMMETE
9. R EXAMPLE TO TURNS AROUND JAWS AMPS FOR THERMOSTAT SETTING Fig 14 Amp Draw Check with Ammeter Fig 15 Blower Control Center 5 When thermostat is satisfied circuit between R and W is broken de energizing gas valve 5F inducer motor relay 2D and solid state time delay circuit on printed circuit board Gas flow stops immediately to pilot and main burners After approximately 105 seconds heat relay 2E is energized and blower motor 3D stops NOTE After brief interruption of either electric or gas supply furnace will not resume operation until con tacts of pilot flame sensing switch 6H move from nor mally open to normally closed position COOLING CYCLE 1 Wall thermostat calls for cooling 2 The R G and Y circuits are energized Simultan eously R and Y circuit starts outdoor condensing unit and R and G circuit energizes cooling relay coil 2F which closes normally open contacts 2F energizing cooling speed winding of motor 3D and opening normally closed contacts of cooling relay 2F START UP AND ADJUSTMENT In addition to the following information refer to Procedures for Induced Combustion Gas Fired Fur naces packaged with the unit NOTE Furnace blower door must be in place to complete 115 volt circuit to furnace A CAUTION Furnace is equipped with a fusible link in vestibule area Link will melt if overheating condition caused by inadequate combustion air supply or improper venting practi
10. alve 5F opens heating relay coil 2E is de energized which closes the 115 volt contacts of heating relay 2E starting blower motor 3D on its heating speed TO t20 VAC FIELD CONNECTIONS SCHEMATIC NAT L amp PROP 1901 4 1082 5 2D 1093 1 103 2 1082 1081 7 lt EAC 1 ans EAC 2 lect Rosie EA AIRC LEANER Q or WHEN USED PR i 120 VAC ys 2 H1 IA 11C 10B TIB SEC i 249 VAC USEC 1081 5 fk WHEN USED SOLID STATE TIME DELAY RELAY J1 o OS sO 309260 401 Rev D LEGEND 1A Transformer 115 VAC 24 VAC 10B3 Edge Connector inducer 2D Inducer Motor Relay Control Board 2 CKT OPST N O 10B4 Pilot Connector 2E Heating Blower Relay HFR 10B5 Factory Test Points DPST N C 1086 Blower Motor Connector 2F Cooling Blower Relay CFR 11C Fusible Link Overtemperature OPDT 11E Equipment Ground 3A Inducer Motor 11L Adjustable Resistor Off Time 3D Blower Motor TP1 Test Point 4A Run Capacitor 5F Gas Valve Redundant awe Factory Wiring 115 VAC 6C2 PC Board Inducer Control 6F Spark Generator Solid State __ Factory Wiring 24 VAC 6H Pilot Fiame Sensing Switch SPDT 733B m Field Wiring 115 VAC 7H1 Limit Switch SPST N C 7H2 Draft Safeguard Switch Conductors on 6C1 Furnace SPST N C Manual Reset Control Board 7H3
11. at zero or negative pressure at the amp vent connector outlet This furnace therefore complies with the National Fuel Gas Code NFPA 54 1984 or ANSI Z223 1 1984 Part 7 14 3 b This furnace is also listed by AGA for use with the type BI gas vent as described in the National Fuel Gas Code Part 7 3 2 Each furnace is shipped from the factory completely assembled with multispeed direct drive blower and wired ready for indoor heating installation All sizes feature a blower control center with easy to read low voltage terminal strip to ensure proper connections The output capacity and any representations of effi ciency for this product are based on standard Department of Energy test procedures The installed operation may vary depending on installation weather and other factors A CAUTION Do not block openings in front of furnace or on furnace top along side vent pipe These openings provide air for combustion and ventilation Never store anything on or in contact with furnace such as aerosol cans rags brooms and mops cleaning tools and aids powders bleaches waxes plastic items gasoline kerosene lighter fluids cleaning fluids thinners painting compounds or paper products week enrere l l rn a ji A CAUTION Do not install furnace in a corrosive or contaminated atmosphere Adhere to all combustion and circulat ing air requirements listed in Procedures for Induced Combustion Gas Fired Fur
12. ces develops Do not Jumper this fuse Correct condition and replace fuse with identical part Gas service pressure must not exceed 14 in we 1 2 in psig for natural gas NOTE Gas valve regulator has been factory set at 3 5in we for natural gas Refer to Procedures for Induced Combustion Gas Fired Furnaces for readjusting when checking input Adjustment of Blower Speed A WARNING Disconnect electrical power before changing speed tap to avoid possibility of electric shock personal injury or death To change motor speed taps remove motor tap lead See Table 6 Relocate it on desired terminal on plug in terminal block speed selector located on blower A CAUTION When adjusting blower speed make certain that temperature rise across heat exchanger does not exceed that specified on rating plate Table 6 Speed Selector NOTE Black control box lead to cooling speed selection red control box lead to heating speed selection Automatic Gas Control Valve Unit is equipped with an automatic gas control valve If not already checked when lighting main burner check proper opera tion of valve by moving room thermostat pointer above room temperature and observing that main burners light on call for heat there will be a time delay and go off when pointer is moved below room temperature setting NOTE For ease of adjusting pilot flame disconnect and tape one power lead at main gas valve Disconnect te
13. ide of inducer control box 7 Remove 8 screws that secure flue collector box to center panel Use care not to damage sealant 8 Remove complete inducer assembly from furnace exposing flue openings 9 Remove flue choke 10 Clean cells using field supplied small wire brush steel spring cable reversible electric drill and vacuum cleaner a Assemble wire brush and steel spring cable 1 Use 4ft of 1 4 in diameter high grade steel spring cable commonly known as drain cleanout or Roto Rooter cable 2 Use 1 4 in diameter wire brush commonly known as 25 caliber rifle cleaning brush NOTE Items called for in steps and 2 may be purchased at local hardware store 12 13 14 15 16 18 19 20 21 22 3 Remove metal screw fitting from wire brush to allow insertion into cable 4 Insert twisted wire end of brush into end of spring cable and crimp tight with crimping tool or strike with ball peen hammer Tight ness is very tmportant b Clean each heat exchanger cell 1 Attach variable speed reversible drill to end of 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 3 ft of cable into 2 upper passes of cell See Fig 18 3 Work cable in and out of cell 3 or 4 times to sufficiently clean Do not pull cable with great force Reverse drill and gradually work cable out 4 Remove bur
14. naces Observe all local codes and ordinances Fig 2 Furnace in Horizontal Position Manufacturer reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations Book 1 4 PC 101 Catalog No 535 845 Printedin USA Form 58DHB 2S Pg 1 3 87 Replaces 58DHB iSI Tab 6aj8a For replacement items contact distributor DIA KO HERMOSTAT IRE ENTRY RELOW 3 4 OUTLET j A DIMPLES TO 5 DRILL HOLES amp FOR HANGER BOLTS BOTH SIDES Fig 3 Dimensional Drawing in Installation Procedures Page Inspection irec rereoisid er takes as ae VR Sates 4 Location Ventilation and Air for Combustion Gas Pipe aoe reaa nakaa EE EEE wae Mae i VSHEING orice so eE ar acters ae E wate eg x Supply Air Plenum Installation downflow 2 Horizontal Attic Installation 0 00 2 Crawl Space Installation see eee cece ee 4 Filter Arrangement 2 cise eats ceed eee tees bo HOS 4 Electrical COnnections ve scace t 84 sha owes 5 Sequence of Operation viriiken say eas aens wwe ew aes 6 Start Up and Adjustment 0 ce eee eens 7 Care and Maintenance orc ii wi oS seed eo els aed 8 Refer to appropriate sections of Procedures fo1 Induced Combustion Gas Fired Furnaces booklet packed with this furnace INSTALLATION Supply Air Plenum Downflow INSTALLATION ON CONCRETE SLAB l See Fig 3 for dimension
15. ner assembly and flame radiators Identify gas valve leads 5 Insert brush end of cable in lower opening of cell Clean 2 lower passes of cell in same manner as 2 upper passes 6 Repeat above procedures until each cell in furnace has been cleaned 7 Using vacuum cleaner remove residue from each cell 8 Using vacuum cleaner with soft brush attach ment clean burner assembly 9 Reinstall burner assembly and flame radiators Take care to center flame radiators in the cell openings Refer to furnace wiring diagram when reconnecting gas valve leads After cleaning flue openings check sealant on flue collector to ensure it has not been damaged If new sealant is needed replace with proper material Replace flue choke Clean and replace flue collector assembly making sure all 8 screws are secure Replace 4 screws that secure relief box to blower shelf Reconnect 2 wires to safeguard switch Reconnect wire harness edge connector to side of inducer control box Reconnect vent pipe to relief box Reinstall pipe enclosure Replace blower door only Turn on power and gas Set thermostat Check furnace for proper operation Check for gas leaks Replace control door A WARNING Never use a match or other open flame to check for gas leaks Use a soap and water solution to avoid possibility of fire explosion personal injury or death Pilot Check pilot and clean if necessary at beginning of each heating
16. r minal no This prevents main burner ignition and allows time to adjust pilot Reconnect power lead after adjustment CARE AND MAINTENANCE A CAUTION lo prevent possible damage to equipment or personal injury maintenance should be performed only by qualitied persons A WARNING To avoid possibility of fire explosion personal injury or even death never store anything near furnace such as 1 Aerosol cans rags brooms dust mops cleaning aids and tools 2 Soap powders bleaches waxes or other cleaning compounds plastics gasoline kerosene lighter fluids dry cleaning fluids or other combustible fluids Paint thinners painting compounds paper products For continuing high performance and to minimize possible equipment failure it is essential that periodic maintenance be performed on this equipment Consult dealer as to proper frequency of maintenance and avail ability of a maintenance contract Ability to properly perform maintenance on this equip ment requires certain mechanical skills and tools If you do not possess them contact dealer for maintenance 4 WARNING Turn off gas and electrical supplies to unit before performing any maintenance or service on unit Follow relighting instructions on plate attached to furnace to avoid possibility of fire explosion personal injury or death PILOT REGULATOR ADJUSTMENT ADJUSTMENT PILOT TUBE CONNECTION PRESSURE TAP MANUAL ON OFF
17. s use type Bl 2 Connect gas supply pipe See Fig 8 for typical piping vent pa Raa g entry It is important to install a sediment trap in the CONSTRUCT WORKING PLATFORM gas pipe riser 1 Place working platform in location where all required 3 Connect supply and return air ducts ai eaten pie Opiate DIE Oe Tabie L a Install duct flange kit field supplied as shown in 2 Use materials in platform that can support installer Fig 9 and service persons b Connect duct to furnace using appropriate 3 Secure platform to building joists fasteners for type of supply air duct being used LINE CONTACT ONLY PERMISSIBLE BETWEEN LINES FORMED BY INTERSECTIONS OF THE TOP AND IDES OF THE FURNACE JACKET AND BUILDING JOISTS STUDS OR FRAMING Fig 9 Duct Flange Installation Field Supplied Table 5 Filter Retainer Field Supplied in FURNACE CASING WIDTH DIM A Fig 10 14 6 15 17 14 21 13 6 24 12 c Install filter retainer kit field supplied before connecting return air duct to furnace See Fig 10 and Table 5 See note below NOTE For ease of servicing a return air filter can be installed in a common return air grille Air velocity rating must not exceed 300 fpm for disposable filters Air velocity through reusable type filters shall not exceed manufacturer s recommendations d Using appropriate fasteners for type of duct being used connect return air duct to furnace 4 Install 24 x 24 in
18. s and location of supply air opening in furnace bottom 2 Construct hole in floor See Fig 4 and Table 4 3 Place plenum and furnace as shown in Fig 5 INSTALLATION ON COMBUSTIBLE FLOOR l Read installation instructions packaged with acces sory combustible floor base Fig 6 2 Cut and frame hole in floor See installation instruc tions packaged with combustible floor base If this requires cutting a floor joist tie ends of cut joist into adjacent joists for proper floor support 3 Assemble and install combustible floor base per instructions packaged with base 4 When completed install combustible floor base plenum and furnace or coil casing when used See Fig 7 Horizontal Attic Installation The Model58DHB furnace can be installed horizontally on either the left hand or right hand side A typical attic installation is Shown in Fig 8 Table 1 Clearances in 040 and 055 075 115 DOWNFLOW In Alcove or Closet Sides Single Wall Vent Type B1 Double Wall Vent Back Top Front Single Wall Vent Type B1 Doubje Wall Vent Vent Single Wail Type B1 Double Wall HORIZONTAL In Alcove Sidest Back Top Single Wall Vent Type B1 Double Wall Vent Front Vent Single Wall Type B1 Double Wall HORIZONTAL In Closet Sidest Back Top Single Wall Vent Type B1 Doukle Wall Vent Front Single Wall Vent Type B1 Double Wall Vent Vent Single Wall Type B1 Doubie Wall
19. season Pilot flame should be high enough for proper impingement of safety element and to light burners Remove accumulation of soot and carbon from safety element or sensing probe and check electrode position See Fig 19 Fig 18 Cleaning Heat Exchanger Cell Electrical Controls and Wiring NOTE There may be more than one electrical supply to unit al l With power to unit disconnected check all electrica connections for tightness Tighten all screws on electrical connections If any smoky or burned connections are noticed disassemble connection clean all parts and stripped wire reassemble properly and securely Elec trical controls are difficult to check without proper instrumentation therefore reconnect electrical power to unit and observe unit through one complete operating cycle If there are any discrepancies in operating cycle contact dealer and request service Fig 19 Position of Electrode to Pilot in ie Manufacturer reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations Book 1 14 Tab j6a 8a PC 101 Catalog No 535 845 PrintedinUSA Form 58DHB 2S1 Pg 10 3 87 Replaces 58DHB 1SI For replacement items contact distributor
20. sheet metal shield on platform in front of louvered control panel See Fig 8 Fig 10 Horizontal Filter Arrangement See Table 5 Brackets are field supplied Crawl Space Installation The Model 583DHB furnace can be installed horizontally with either the left hand or right hand side up In crawl space furnace can either be hung from floor joist or installed on suitable blocks or pad Furnace can be suspended from each corner by hanger bolts use four 3 8 in all thread rods cut to desired length x 3 8 in flat washer 3 8 in lock washer and 3 8 in nut Dimples are provided for hole locations See Fig 3 NOTE Use type B vent in a concealed space Crawl space installation is very similar to attic installa tion Refer to Horizontal Attic Installation Install Furnace steps 1 2 3 Installation of sheet metal shield in front of louvered control panel is covered in step 4 For crawl space installation the same size sheet metal shield must be installed above louvered control panel When installing furnace in horizontal position in a crawl space extend sheet metal shield over furnace top sufficiently to cover gas pipe entry hole Filter Arrangement Two factory supplied filters are shipped in blower compartment After return air duct has been connected to furnace install filters in a TN RETURN AIR PLENUM INSTALLATION POSITION OF FILTER ACCESS PANEL Fig 11 Downflow Filter Arrangement
21. thermostat calls for heat closing R and W circuit This closed circuit supplies power to 24 volt safety circuit containing limit switch 7H1 fusible link 11C manual reset draft safeguard switch 7H2 and manual reset auxiliary switch 7H3 3 Simultaneously PICK coil of gas valve 5F spark generator 6F and inducer motor relay coil 2D are energized Inducer motor relay contacts 2D in the 115 volt circuit close starting inducer blower motor 3A Also another set of contacts in inducer motor relay 2D closes in 24 volt circuit and locks in inducer motor relay coil 2D Coil is locked in until R and W circuit or safety circuit opens 4 When PICK coil of gas valve 5 Fis energized gas flows to pilot Pilot gas is ignited by a spark produced by spark generator 6F Simultaneously inducer motor 3A comes up to speed actuating flow sensing switch 7V energizing HOLD coil of gas valve SF PICK coil of gas valve 5F and spark generator 6F are de energized when contacts of pilot flame sensing switch 6H move from normally closed position breaking circuit to PICK coil and spark generator In approxi mately 50 to 60 seconds normally open pilot flame sensing contacts close making circuit to MGV Main Operator of gas valve 5F Gas valve 5F opens in approximately 10 seconds allowing gas flow to main burners which are ignited by pilot 6H Simultan eously time delay circuit 11L in blower control center is energized Approximately 50 seconds after gas v
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