These instructions must be read and understood completely before attempting installation. Safety Labeling and Signal Words DANGER, WARNING, CAUTION, and NOTE _ The signal words DANGER, WARNING, CAUTION, and NOTE Signal Words in Manuals The signal word WARNING is used throughout this manual in are used to identify levels of hazard seriousness. The signal word _ the following manner: DANGER is only used on product labels to signify an immediate hazard.
FRONT OF CASING Figure 1 - Dimensional Drawing —~ - & 16/16 150.7] — AIR FLOW 118/18 | BOF ane S768 159] [08.8] 1148.5] : ts P1385) [250.7] | 1190.5] TONETION BOX 978 ; 1 LOCATION | 12.7] 71 1 |[ THERMOSTAT WIRE ENTRY 33 1/4 TO [23.9] 7 (445) z | & be é i a : [736.9 AIR FLOW A roi | sa 4 AIR FLOW 19 dt Var:THEAMOSTAT WIRE ENTRY thy a. | ane m LT i [243.3] 1 ey SS jy he LE 4 oy 27 314 [704.7] men 20016 C718 —| [22.
SAFETY CONSIDERATIONS 4 4 WARNING CUT HAZARD FIRE, EXPLOSION, ELECTRICAL SHOCK, CARBON MONOXIDE POISONING HAZARD AND Failure to follow this warning could result in dangerous operation, serious injury, death, or property damage. Improper installation, maintenance, or use poisoning, explosion, adjustment, alteration, service, could cause carbon monoxide fire, electrical shock, or other conditions which may cause personal injury or property damage.
INTRODUCTION F8MXN, G8MXN, F8MXL, and G8MXL, 4-way multipoise Category | fan-assisted furnace is CSA design-certified. A Category | fan-assisted furnace is an appliance equipped with an integral mechanical means to either draw or force products of combustion through the combustion chamber and/or heat exchanger. The furnace is factory-shipped for use with natural gas. This furnace is not approved for installation in mobile homes, recreational vehicles, for minimum or outdoors.
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS PROCEDURE tb yies MAX Improper installation or service of furnace may TF EN NFGC NFPA54/ANSI Z223.1-2009 Section 9.3, Air for Combustion and Ventilation.
Figure 4 - Multipoise Orientations AIRFLOW a. THE BLOWER IS LOCATED TO THE RIGHT OF THE BURNER SECTION, AND AIR CONDITIONED AIR IS DISCHARGED TO THE LEFT. a aL > UPFLOW THE BLOWER IS LOCATED BELOW THE BURNER SECTION, AND CONDITIONED AIR IS DISCHARGED UPWARD. HORIZONTAL RIGHT HORIZONTAL LEFT AIRFLOW [> AIRFLOW DOWNFLOW THE BLOWER IS LOCATED TO THE LEFT OF THE BURNER SECTION, AND CONDITIONED AIR IS DISCHARGED TO THE RIGHT.
All fuel-burning equipment must be supplied with air for fuel combustion. Sufficient air must be provided to avoid negative pressure in the equipment room or space. A positive seal must be made between the furnace cabinet and a the CAUTION PERSONAL INJURY AND/OR PROPERTY DAMAGE HAZARD return-air duct to prevent pulling air from the burner area and from draft safeguard opening.
Table 3 — Minimum Space volumes for 100% combustion, Ventilation, and Dilution from Indoors OTHER THAN FAN-ASSISTED TOTAL (1,000°S BTUH GAS INPUT RATE 30 | 40 50 ACH FAN-ASSISTED TOTAL (1,000°S BTUH GAS INPUT RATE) 66 | 88 110 | | 132 Space Volume (ft.3) 0.60 0.50 0.40 0.30 0.20 0.10 0.
c. TWO HORIZONTAL DUCTS require 1 square inch of free area per 2,000 Btuh (1,100 mm2/kW) 4 of combined input for all gas appliances in the space per Figure 7 and Table 2. d. TWO CARBON OPENINGS OR VERTICAL DUCTS require 1 for combined input of all gas appliances in the space per Figure 7 and Table 2. a.
in 12” (300 mm) of the floor. The minimum dimension of air openings shall be at least 3 in. (80 mm). (See Figure 8) c. Combining volumes space on of spaces different floor levels. The on different floor levels shall be considered as communicating spaces if connected by one or more permanent openings in doors or floors having free area of at least 2 in.2/1,000 Btuh (4,400 mm?/kW) of total input rating of all gas appliances. Combination of Indoor and Outdoor Air 1.
closure panel to install leveling legs. To remove bottom closure panel, see Item 1. in Bottom Return Air Inlet section. Figure 11 - Fioor and Plenum Opening Dimensions To install leveling legs: 1. Position furnace on its back. Locate and drill a hole in each bottom corner of furnace. (See Figure 10) 2. For each leg, install nut on bolt and then install bolt and nut in hole. (Install flat washer if desired.) 8. Install another nut on other side of furnace base. (Install flat washer if desired.
Table 4 —- Opening FURNACE Dimensions - In.
2. Rotate bottom filler panel downward tabs. 3. Remove to release holding bottom closure panel. 4. Reinstall bottom filler panel and screws. Side Return Air Inlet furnaces are shipped with bottom closure panel installed in bottom return-air opening. This panel MUST be in place when side return air inlet(s) is used without a bottom return air inlet. Not all horizontal furnaces are approved for side return air connections. (See Figure 20).
Figure 14 - Duct Flanges Zl UPFLOW [oR DOWNELOW el HORIZONTAL ~\ [o YES ~ YES YES NO YES ‘aX. YES NO NO 02020 Figure 15 - Horizontal Unit Suspension ya" (6mm) THREADED 4 REQ.
Figure 16 - Horizontal Suspension with Straps iF 22 GAUGE GALVANIZED STRAPS TYPICAL FOR 4 STRAPS —_— Lo AIR L~ OPENING OUTER DOOR ASSEMBLY 7) \ ~ Pmeron 2 USE (4) #8 x 3/4 (19 mm) SHEET METAL SCREWS FOR EACH STRAP. THE STRAPS SHOULD BE VERTICAL AGAINST THE FURNACE SIDES AND NOT PULL AWAY FROM THE FURNACE SIDES. BACK OF FURNACE METHOD 4 FOLD ALL STRAPS UNDER FURNACE AND SECURE WTH (4) #8 x 3/4 (19 mm) SHEET METAL SCREWS (2 SCREWS IN SIDE AND 2 SCREWS IN BOTTOM).
furnace casing as shown in humidifier may be attached furnace casing. (See Figure Not all horizontal furnaces connections. (See Figure 20 and Figure 22. Bypass into unused return air side of the 20 and Figure 22) are approved for side return air An accessible manual equipment shutoff valve MUST be installed external to furnace casing and within 6 ft. (2 M) of FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in personal injury, death, and/or property damage.
Table 5 — Air Delivery - CFM UNITSIZE | 0451408 0701716 0902116 1102120 1352420 COLOR SPEED Gray Yellow Blue Orange Red Gray Yellow Blue Orange Red Gray Yellow Blue Orange Red Gray Yellow Blue Orange Red Gray Yellow Blue Orange Red 5 4 3 2 1 5 4 3 2 1 5 4 3 2 1 5 4 3 2 1 5 4 3 2 1 0.4 1185 920 735 820 650 1625. 1405. 1240 1190 1035 1845 1590 1365 1225.| 1100 2255 1600. 1945 1420 1280 2205 1725. 1910 1630 1430 | | | | | | | | | | | | | | | | | | | 0.
Figure 20 - Upflow Return Air Configurations and Restrictions SUPPLY AIR UPFLOW RETURN AIR FLOW AIR CONFIGURATIONS MODELS RETURN AIR CONNECTION ONLY 5 TONS AND GREATER * ALL OTHER MODELS 1 AND RESTRICTIONS RETURN AIR CONNECTION ONLY 2 RETURN AIR CONNECTION ONLY 3 RETURN AIR COMBINATIONS OF 1, 2, AND 3 YES YES YES YES YES YES YES YES * 2000 CFM AND GREATER AT .
Table 7 — Electrical Data FURNACE UWE OPERATING VOLTAGE* WOLTS) MAX MIN 127 104 127 104 127 104 127 104 127 104 VOLTS— HERTZ— PHASE 115—60—1 115—60—1 115—60—1 115—60—1 115—60—1 0451408A 0701716 0902116A 1102120A 1352420A MAX UNIT (AMPS) 84 10.8 11.4 14.2 14.2 UNIT AMPACITY# | (AMPS) 10.9 14.2 14.8 18.2 18.2 MAX WIRE = LENGTH FT.
ELECTRICAL CONNECTION TO J-BOX Figure 24 - Field-Supplied Electrical Box on Furnace Casing Electrical Box on Furnace Casing Side 4 WARNING FIRE OR ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury, death, or property damage. If field-supplied manual disconnect switch is to be mounted on furnace casing side, select a location where a drill or fastener cannot damage electrical or gas components. 1.
ACCESSORIES the control board thermostat strip. The HUM 24VAC terminal is energized when there is a call for heat (W) 1. Electronic Air Cleaner (EAC) Connect an accessory Electronic Air Cleaner and the gas valve relay GVR is energized. (See Figure 25 and Figure 55). NOTE: A field-supplied, 115-v control relay connected to EAC terminals may be added if humidifier operation is desired during blower operation.
Figure 26 - Heating and Cooling Application Wiring Diagram with Single-Stage Thermostat ~~ worms ——— mane FIELD 24-VOLT WIRING FIELD 115-, 208/230-, 460-VOLT WIRING FACTORY 24-VOLT WIRING FACTORY 115-VOLT WIRING 1-STAGE FIVE WIRE THREE-WIRE HEATINGONLY Steep lve} Wily wn nn fA ganda FUSED DISCONNECT db Pip so od | |@yi OP i | BOX CONTROL BOx| ICP THERMOSTAT ECM SINGLESTAGE FURNACE [| Ww [ ] lYyN2 } [ec] tt o—el--| @}--~} 208/280- eibel--a @-—— OUT ----|---@------J rr PHASE CON
Figure 29 - ECM Single-Stage Furnace with SingleStage Heat Pump (Dual Fuel) ECM SINGLESTAGE FURNACE ICP THERMOSTAT SINGLE-STAGE HEAT PUMP Figure 31 - ECM Single-Stage Furnace and Humidifier Only HUMIDITY SENSING THERMOSTAT ECM SINGLE-STAGE FURNACE Le | ° { ©| Ls Ls] ils s AEE Lf R OTE HUMIDIFIER 115 VAC [| L__J Die See note 6 Lol c L__J Figure 32 - AC with ECM Single-Stage Furnace, Humidifier and Dehumidification HUM 24VAC ECM SINGLE-STAGE FURNACE O/B OUTDOOR a oO on m Zz a
Figure 33 - HP with ECM Single-Stage Furnace, Humidifier and Dehumidification HUMIDITY SENSING THERMOSTAT 4. ECM SINGLE-STAGE FURNACE CARBON WARNING MONOXIDE POISONING HAZARD A Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monoxide poisoning O/B or death.
following information and warning must be considered addition to the requirements defined in the NFGC. 1. If a vent (common or dedicated) becomes in a. Shows signs of vent gas condensation, the chimney should be relined in accordance with local codes and the authority having jurisdiction. The chimney should blocked, the be relined with a listed metal liner, Type-B vent, or a furnace will be shut off by the draft safeguard switch listed chimney adapter kit shall be used to reduce condensation.
APPLIANCE APPLICATION REQUIREMENTS Appliance operation has a_ significant impact system. Do not use vent dampers on appliances common sized, installed, adjusted, and operated properly, the venting vented with this furnace. ADDITIONAL VENTING REQUIREMENTS A 4” (101 mm) round vent elbow is supplied with the furnace. system A 5-inch performance of the and/or venting the system. appliances If the should on the appliances are not suffer from condensation and corrosion.
Figure 34 - Chimney Inspection Chart CHIMNEY INSPECTION CHART For additional requirements refer to the National Fuel Gas Code NFPA 54/ANSI Z223.1 and ANSI/NFPA 211 Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances Crown condition: Missing mortar or brick? ; Rebuild crown. J Is chimney property lined with clay tile liner? No Yes Is liner and top No seal in good condition? Repair liner or top seal "Nor reline chimney as necessary.
4 The CAUTION BURN HAZARD Failure to follow this caution injury. may horizontal portion of the venting system shall slope upwards not less than 1/4-in. per linear ft. (21 mm/M) from the furnace to the vent and shall be rigidly supported every 5 ft. (2 M) or less with metal hangers or straps to ensure there cause is no movement after installation. SIDEWALL VENTING This furnace is not approved for direct sidewall horizontal venting.
Figure 39 - Downflow Application-Vent Elbow Left then SEE NOTES: ,2,3,4,5,7,8,9 on the page following Uy Up of Figure 37 - Downflow Application-Vent Elbow Up then Left SEE NOTES: 1,2,4,5,6,7,8,9 on the page following these figures these figures A03210 Figure 38 - Downflow Application-Vent Elbow Up A03207 Figure 40 - Downflow Application-Vent Elbow Up then Right SEE NOTES: 1,2,4,5,7,8,9 on the page following SEE NOTES:1,2,3,4,5,7,8,9 these figures on the page following these figures.
Figure 41 - Horizontal Left Application-Vent Elbow Left Figure 45 - Horizontal Right Application-Vent Elbow Left then Up Tt = O Z \ NOTES: \ je \ Jet SEE - 1,2,4,7,8,9 on the page following these figures SEE NOTES: 1,2,4,5,7,8,9 on the page following these figures A03213 Figure 42 - Horizontal Left Application-Vent Elbow Right then Up A03219 Figure 46 - Horizontal Left Application-Vent Elbow Right ‘[o, J | LY / ae a C) Ne io "8 ! SEE SEE NOTES: 1,2,4,5,7,8,9 on the page following th
. Four-inch single-wall (26 ga. min.) vent must be used inside furnace casing and when the Downflow Vent Guard Kit is used external to the furnace. . Accessory Downflow Vent Guard Kit, required in downflow installations with lower vent configuration. . Chimney Adapter Kit may be required for exterior masonry chimney applications. Refer to Chimney Adapter Kit, for sizing and complete application details. . Secure vent connector to corrosion-resistant sheet approximately 180° apart.
Step 3 —Adjustments 4 Table 10 — Altitude Derate Multiplier for U.S.A. WARNING ALTITUDE (FT. / M) PERCENT OF DERATE 0 8-12 12-16 16-20 20-24 24-28 28-32 32-36 36-40 FIRE HAZARD Failure to follow this warning could result in injury, DO NOT bottom out gas valve regulator screw. This can result in unregulated adjusting manifold death and/or property damage. pressure and result exchanger failures. 4 FURNACE in excess NOT and heat CAUTION DAMAGE redrill orifices.
If clocked increase rate does manifold not match pressure required to increase manifold pressure to decrease input from Step 1, Figure 48 - Gas Control Valve input or decrease input. Repeat steps b through e until correct input is achieved. Reinstall regulator seal cap on gas valve. 5. Set temperature rise. The furnace must operate within the temperature rise ranges specified on the furnace rating plate. Do not exceed temperature rise range specified on unit rating plate.
6. Set thermostat heat anticipator. a. Mechanical thermostat - Set thermostat heat anticipator to match the amp. draw of the electrical compon- ents in the R-W circuit. Accurate amp. draw readings can be obtained at the wires normally connected to thermostat subbase terminals, R and W. The thermo- stat anticipator should measuring current. NOT be in the circuit while h. Re-install vent connector.
Table 11 - Gas Rate (Cu Ft./Hr.) SECONDS SIZE OF TEST DIAL SECONDS SIZE OF TEST DIAL FOR 1 REVOLUTION cu Ft. 2 Cu Ft. 5 Cu Ft. FOR 1 REVOLUTION 1 Cu Ft. 2 Cu Ft. 5 Cu Ft.
Table 13 — Orifice Size* and Manifold Pressure (In. W.C.) for Gas Input Rate (TABULATED DATA BASED ON 22,000 BTUH PER BURNER, ALTITUDE AVG. RANGE GAS HEAT VALUE AT ALTITUDE | ft (m) 0.58 Orifice GRAVITY OF NATURAL 0.60 Manifold | Orifice GAS 0.62 Manifold | Orifice 0.64 Manifold | Orifice Manifold (Btu/cu ft) No. Pressure No. Pressure No. Pressure No. Pressure 900 42 3.5 42 3.6 42 3.7 41 3.5 0 925 42 3.3 42 3.4 42 3.5 42 3.7 (0) 950 43 3.8 42 3.3 42 3.
Table 13 - Orifice Size* and Manifold Pressure (In. W.C.) for Gas Input Rate (CONT) (TABULATED DATA BASED ON 22,000 BTUH PER BURNER, DERATED 4%/1000 FT (305M) ABOVE SEA LEVEL) ALTITUDE RANGE AVG. GAS AT ALTITUDE | ft (m) < SPECIFIC GRAVITY HEAT VALUE 0.58 Orifice | OF NATURAL 0.60 GAS 0.62 0.64 Manifold | Orifice | Manifold | Orifice | Manifold | Orifice | Manifold (Btu/cu ft) No. Pressure No. Pressure No. Pressure No. Pressure 650 43 3.1 43 3.2 43 3.4 43 3.
Table 14 — Orifice Size* And Manifoid Pressure (In. W.C.) For Gas Input Rate (TABULATED DATA BASED ON 21,000 BTUH PER BURNER, ALTITUDE RANGE AVG. GAS HEAT VALUE AT ALTITUDE | ft (m) 0 (0) ; = 5 to 2000 (610) “ _ | 2001 (611) > | < 5 to 3000 (914) 3001 (915) to 4000 (1219) < s 4001 (1220) to 5000 (1524) < s 5001 (1525) to 6000 (1829) < = 6001 (1830) to 7000 (2133) 0.58 Orifice Manifold Orifice (Btu/cu ft) No. Pressure No.
Table 14- Orifice Size* And Manifold Pressure (In. W.C.) For Gas Input Rate (CONT) (TABULATED DATA BASED ON 21,000 BTUH PER BURNER, DERATED 4%/1000 FT (305M) ABOVE SEA LEVEL) ALTITUDE RANGE AVG. GAS SPECIFIC GRAVITY OF NATURAL HEAT VALUE AT ALTITUDE |} ft (m) 0.58 Orifice | 0.60 GAS 0.62 0.64 Manifold | Orifice | Manifold | Orifice | Manifold | Orifice | Manifold Pressure (Btu/cu ft) No. Pressure No. Pressure No. Pressure No. 650 43 2.9 43 3.0 43 3.1 43 3.2 7001 675 43 2.
SERVICE AND MAINTENANCE PROCEDURES 4 The electrical ground and polarity for 115-v wiring must be properly maintained. Refer to Figure 26 for field wiring information and to Figure 55 for furnace wiring information. NOTE: [If the polarity is not correct, the STATUS LED on the WARNING FIRE, INJURY, OR DEATH HAZARD Failure to follow this warning could result in personal injury, death and/or property damage.
4 BLOWER WARNING 4 ELECTRICAL SHOCK AND FIRE HAZARD Failure to follow this warning could result in Failure to follow this warning could result in personal injury or death. Turn off the gas and electrical supplies to the unit install a lock out tag before performing any Blower access door switch opens 115-v power to control. No component operation can occur unless maintenance or service. Follow the operating instructions on the label attached to the furnace. 4 switch is closed.
10. Reassemble motor and blower by reversing steps 11f 20. Cycle furnace through through 11a, finishing with 11a. Be sure to reattach ground wire to the blower housing. 11. Verify that blower wheel is centered in blower housing tion if necessary. 12. Spin the blower wheel by hand to verify that the wheel CLEANING HEAT EXCHANGER does not rub on the housing.
NOTE: A releasing agent such as a vegetable oil cooking spray that does not contain corn oil, canola oil, halogenated Figure 52 - Igniter Position-Side View 9/32” hydrocarbons or aromatic content, which may prevent an inadequate seal from occuring, and RTV sealant such as G.E. RTV 162, G.E. RTV 6702, or Dow-Corning RTV 738 sealant are required. DO NOT substitute any other type of RTV sealant. — 7.1mm 5/167 7.9mm r | 12.
Sequence of Operation NOTE: Furnace control must be grounded for proper operation or control will lock out. Control is grounded through green/yellow wire routed to gas valve and manifold bracket EAC 1 AMP is energized and remains energized as long as the blower motor BLWM is energized. f. Heat-Off Delay- When the thermostat is satisfied, the screw.
fy mode. If the DHUM input is low for more than 48 hours, the furnace control reverts back to non-humidity sensing thermostat mode. The cooling operation described in item 2. above also applies to operation with a humidity sensing thermostat. The exceptions are listed below: a. When the R-to-G-and-Y1 circuit is closed and there is a demand for dehumidification, the furnace blower motor BLWM will continue running at low-cool speed (same speed as FAN). b.
CONNECTION PCB Zz 4Zz NOTE #5 g (NATURAL & PROPANE GASES) NOTE #2 ILk a SCHEMATIC DIAGRAM TO 115 VAC FIELD DISCONNECT SWITCH DIAGRAM FRS2 441 01 1411 03 HEAT OFF-DELAY JUMPER SELECTOR NEUTRAL L2 (WHEN USED) GrNvELPR NOTE #10 A o A a — § HUM 24VAC 8 RG RED Fut §2 ORG 4 BVSS (WHEN USED) NOTE#6 FUSE 3AMP RN 24VACRED Ow [oy] aufer —_ |2| YEL SPARE 1 ad oe = a vay ° 7 WHT get FL Yl BLK (WHEN USED) z =
£O LIVE LO Lv Troubleshooting Guide —Single Stage START NO Is LED status light ON solid, alternately flashing bright-dim-bright-dim like a >| Is there 115V at L1 and NEUTRAL? heartbeat, or flashing ON and OFF? NO t—>| YES Close the door switch. YES Vv | NO t—>| Is door switch closed? NO Is there 24V at 24VAC and COM? Vv. | NO Is there 115¥V going to switch? NO t—>| Is circuit breaker closed? YES YES YES Vv Is the 24V fuse open? Vv YES Vv. | Vv. Replace door switch.
£O LIVE PRESSURE SWITCH DID NOT OPEN Check for: - Obstructed pressure tube. - Pressure switch stuck closed. PRESSURE SWITCH DID NOT CLOSE OR REOPENED If opens during blower on-delay period, blower will come on for the selected blower off-delay. If open longer than 5 minutes inducer shuts off for 15 minutes before retry. Check for: — Proper vent sizing. Low inlet gas pressure (if LGPS used). Inadequate combustion air supply. Disconnected or obstructed pressure tubing.
PARTS REPLACEMENT INFORMATION GUIDE Outer door BLOWER GROUP Blower housing Biower door Blower cutoff Top filler plate Bottom filler plate Blower motor HEAT EXCHANGER GROUP Blower wheel Heat exchanger cell Bottom enclosure Capacitor (where used) Cell panel ELECTRICAL GROUP Capacitor strap (where used) Lox NOx baffle (California models only) Control bracket Grommet CASING GROUP Gas valve Manual reset limit switches Junction box Power choke (where used) INDUCER Limit switch(es) Housing
