Operating instructions

ManualsBrandsBryant ManualsFurnace340MAV

NOTE: Read the entire instruction manual before starting the

installation.

This symbol → indicates a change since the last issue.

Index Page

SAFETY CONSIDERATIONS.....................................................2

DIMENSIONAL DRAWING........................................................3

Clearances to Combustibles......................................................4

CODES AND STANDARDS........................................................5

ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS........5

INTRODUCTION..........................................................................5

APPLICATIONS............................................................................5

General ......................................................................................5

Upflow Applications.................................................................5

Downflow Applications............................................................8

Horizontal Left (Supply-Air Discharge) Applications ..........10

Horizontal Right (Supply-Air Discharge) Applications ........11

LOCATION..................................................................................13

General ....................................................................................13

Furnace Location Relative to Cooling Equipment ................14

Hazardous Locations...............................................................14

INSTALLATION.........................................................................14

Leveling Legs (If Desired).....................................................14

Installation In Upflow or Downflow Applications................14

Installation In Horizontal Applications..................................15

Air Ducts.................................................................................15

General Requirements .......................................................15

Ductwork Acoustical Treatment .......................................15

Supply Air Connections ....................................................15

Return Air Connections.....................................................15

Filter Arrangement ............................................................18

Bottom Closure Panel........................................................18

Gas Piping..........................................................................18

Electrical Connections ............................................................19

115-V Wiring.....................................................................20

24-V Wiring.......................................................................20

Accessories ........................................................................21

Direct Venting.........................................................................21

Removal of Existing Furnaces from

Common Vent Systems.....................................................21

Combustion-Air and Vent Piping .....................................24

Concentric Vent and Combustion-Air Termination

Kit Installation...................................................................31

Multiventing and Vent Termination .................................35

Condensate Drain....................................................................35

General...............................................................................35

Application.........................................................................35

Condensate Drain Protection.............................................35

START-UP, ADJUSTMENTS AND

SAFETY CHECK...................................................................35

General...............................................................................35

Prime Condensate Trap With Water.................................36

Purge Gas Lines ................................................................37

Sequence of Operation ......................................................37

Heating Mode...............................................................37

Cooling Mode ...............................................................37

Continuous Blower Mode............................................37

Heat Pump Mode .........................................................38

Component Test ...........................................................38

Adjustments .......................................................................38

Set Gas Input Rate.......................................................38

Set Temperature Rise...................................................45

Blower Off Delay (Heat Mode) ..................................45

Set Thermostat Heat Anticipator.................................46

Check Safety Controls.......................................................46

Check Primary Limit Control......................................46

Check Pressure Switch.................................................46

CHECKLIST......................................................................46

A93040

ama

CERTIFIED

REGISTERED

ISO 9001:2000

As an ENERGY STAR®

Partner, Bryant Heating &

Cooling Systems Com-

pany has determined that

this product meets the EN-

ERGY STAR® guidelines

for energy efficiency.

Fig. 1—Multipoise Orientations

A93041

UPFLOW

DOWNFLOW

HORIZONTAL

LEFT

AIRFLOW

HORIZONTAL

RIGHT

installation, start-up,

and operating instructions

4-WAY MULTIPOISE

FIXED-CAPACITY DIRECT-VENT

CONDENSING GAS FURNACE

Cancels: II 340M-40-12 II 340M-40-13

2-05

340MAV

Series J

—1—

Summary of content (48 pages)

PAGE 1
installation, start-up, and operating instructions 340MAV Series J 4-WAY MULTIPOISE FIXED-CAPACITY DIRECT-VENT CONDENSING GAS FURNACE Cancels: II 340M-40-12 II 340M-40-13 2-05 ama CERTIFIED ® ISO 9001:2000 A93040 NOTE: Read the entire instruction manual before starting the installation. This symbol → indicates a change since the last issue. Index Page SAFETY CONSIDERATIONS .....................................................2 DIMENSIONAL DRAWING....................................................
PAGE 2
SAFETY CONSIDERATIONS propane gases (see furnace rating plate) and for installation in alcoves, attics, basements, closets, utility rooms, crawlspaces, and garages. The furnace is factory-shipped for use with natural gas. A CSA listed gas conversion kit is required to convert furnace for use with propane gas. See Fig. 3 for required clearances to combustibles. Maintain a 1-in. clearance from combustible materials to supply air ductwork for a distance of 36 inches horizontally from the furnace.
PAGE 3
—3— 11⁄4" 1" 14 1⁄2" TYP 26 15⁄16" 1⁄2-IN. 26 15⁄16" TYP 23 1⁄4" TYP SIDE INLET SIDE INLET DIA THERMOSTAT ENTRY 22 11⁄16" 2-IN. VENT CONN DIA GAS CONN 1⁄2-IN. 2-IN. COMBUSTIONAIR CONN 22 5⁄16" 24 1⁄2" 26 1⁄4" UNIT SIZE 024040 036040 024060 036060 048060 036080 048080 060080 048100 060100 060120 060140 11/16" E INLET OUTLET D 11/16" 18 1⁄4" D 15-7/8 15-7/8 15-7/8 15-7/8 15-7/8 15-7/8 15-7/8 19-3/8 19-3/8 19-3/8 22-7/8 22-7/8 Fig.
PAGE 4
INSTALLATION This forced air furnace is equipped for use with natural gas at altitudes 0 - 10,000 ft (0 - 3,050m), except 140 size furnaces are only approved for altitudes 0 - 7,000 ft. (0 - 2,135m). An accessory kit, supplied by the manufacturer, shall be used to convert to propane gas use or may be required for some natural gas applications. This furnace is for indoor installation in a building constructed on site.
PAGE 5
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS For accessory installation details, refer to accessory installation instructions. → CODES AND STANDARDS Follow all national and local codes and standards in addition to these instructions. The installation must comply with regulations of the serving gas supplier, local building, heating, plumbing, and other codes. In absence of local codes, the installation must comply with the national codes listed below and all authorities having jurisdiction.
PAGE 6
FURNACE DOOR BLOWER SHELF CONDENSATE TRAP CONDENSATE TRAP (INSIDE) FURNACE DOOR FURNACE SIDE 4 78 FURNACE SIDE 4 534 534 4 ALTERNATE DRAIN TUBE LOCATION 26 1 4 26 1 4 FIELD DRAIN CONN 11 2 SIDE VIEW CONDENSATE TRAP DRAIN TUBE LOCATION FIELD DRAIN CONN FRONT VIEW END VIEW SLOT FOR SCREW HORIZONTAL APPLICATION (OPTIONAL) FRONT VIEW HORIZONTAL APPLICATIONS DOWNFLOW AND ALTERNATE EXTERNAL UPFLOW APPLICATIONS UPFLOW APPLICATIONS 34 1⁄4 OD COLLECTOR BOX TO TRAP RELIEF PORT 11 2 1⁄2 OD
PAGE 7
PLUG CAP COLLECTOR BOX DRAIN TUBE (BLUE & WHITE STRIPED) COLLECTOR BOX TUBE (PINK) PLUG CAP COLLECTOR BOX DRAIN TUBE (BLUE & WHITE STRIPED) COLLECTOR BOX TUBE (GREEN) COLLECTOR BOX TUBE (PINK) INDUCER HOUSING (MOLDED) DRAIN TUBE (BEHIND COLLECTOR BOX DRAIN TUBE) COLLECTOR BOX DRAIN TUBE (BLUE) COLLECTOR BOX TUBE (GREEN) CONDENSATE TRAP COLLECTOR BOX DRAIN TUBE (BLUE) FIELD-INSTALLED FACTORY-SUPPLIED DRAIN TUBE COUPLING (LEFT DRAIN OPTION) CONDENSATE TRAP FIELD-INSTALLED FACTORY-SUPPLIED DRAIN TUBE
PAGE 8
COLLECTOR BOX DRAIN TUBE (BLUE) CAP PLUG PLUG CAP COLLECTOR BOX TUBE (GREEN) COLLECTOR BOX DRAIN TUBE (BLUE) COLLECTOR BOX EXTENSION TUBE COLLECTOR BOX TUBE (PINK) COLLECTOR BOX TUBE (PINK) COLLECTOR BOX DRAIN TUBE (BLUE & WHITE STRIPED) COLLECTOR BOX TUBE (GREEN) COLLECTOR BOX EXTENSION TUBE COLLECTOR BOX DRAIN TUBE (BLUE & WHITE STRIPED) COLLECTOR BOX EXTENSION TUBE COLLECTOR BOX EXTENSION TUBE INDUCER HOUSING DRAIN TUBE (VIOLET) CONDENSATE TRAP CONDENSATE TRAP COLLECTOR BOX EXTENSION DRAIN TUBE
PAGE 9
PLUG CAP COLLECTOR BOX DRAIN TUBE (BLUE AND WHITE STRIPED) AUXILIARY "J" BOX CONDENSATE TRAP COLLECTOR BOX TUBE (GREEN) INDUCER HOUSING DRAIN TUBE (VIOLET) COLLECTOR BOX EXTENSION DRAIN TUBE COLLECTOR BOX DRAIN TUBE (BLUE) COLLECTOR BOX EXTENSION TUBE DRAIN TUBE COUPLING COLLECTOR BOX TUBE (PINK) RELOCATE TUBE BETWEEN BLOWER SHELF AND INDUCER HOUSING FOR 040, 060, AND 080 HEATING INPUT FURNACES A00215 Fig. 10—Horizontal Left Tube Configuration b.
PAGE 10
B. Condensate Trap Tubing NOTE: See Fig. 10 or tube routing label on main furnace door to check for proper connections. tube (green label) which was factory connected to the condensate trap relief port connection MUST be connected to the pressure switch in DOWNFLOW or HORIZONTAL RIGHT applications. NOTE: See Fig. 8 or 9 or tube routing label on main furnace door to check for proper connections. 1. Collector Box Drain Tube a.
PAGE 11
COMBUSTION – AIR INTAKE VENT 30″ MIN WORK AREA 5 3⁄4″ MANUAL SHUTOFF GAS VALVE A 12-IN. MIN HORIZONTAL PIPE SECTION IS RECOMMENDED WITH SHORT (5 TO 8 FT) VENT SYSTEMS TO REDUCE EXCESSIVE CONDENSATE DROPLETS FROM EXITING THE VENT PIPE. ACCESS OPENING FOR TRAP SEDIMENT TRAP DRAIN CONDENSATE TRAP NOTE: LOCAL CODES MAY REQUIRE A DRAIN PAN UNDER THE FURNACE AND CONDENSATE TRAP WHEN A CONDENSING FURNACE IS INSTALLED ABOVE FINISHED CEILINGS. A93031 Fig. 11—Attic Location and Working Platform F.
PAGE 12
CAP COLLECTOR BOX DRAIN TUBE (BLUE) COLLECTOR BOX TUBE (GREEN) COLLECTOR BOX EXTENSION TUBE COLLECTOR BOX TUBE (PINK) PLUG AUXILARY “J” BOX RELOCATED HERE CONDENSATE TRAP COLLECTOR BOX DRAIN TUBE (BLUE AND WHITE STRIPED) INDUCER HOUSING DRAIN TUBE (VIOLET) COLLECTOR BOX EXTENSION TUBE A00214 Fig. 12—Horizontal Right Tube Configuration B. Condensate Trap Tubing NOTE: See Fig. 12 or tube routing label on main furnace door to check for proper connections. C.
PAGE 13
E. Condensate Trap Freeze Protection Refer to Condensate Drain Protection section for recommendations and procedures. F. Construct a Working Platform Construct working platform where all required furnace clearances are met. (See Fig. 3 and 11.) LEVEL (0″) TO 1⁄2″ MAX CAUTION: UNIT MAY NOT OPERATE Failure to follow this caution may result in intermittent unit operation. The condensate trap MUST be installed below furnace. See Fig. 5 for dimensions.
PAGE 14
FRONT B A C K 32°F MINIMUM INSTALLED AMBIENT OR FREEZE PROTECTION REQUIRED BACK FRONT A93043 Fig. 14—Prohibit Installation on Back II. FURNACE LOCATION RELATIVE TO COOLING EQUIPMENT A93058 Fig. 15—Freeze Protection NOTE: The maximum length of bolt should not exceed 1-1/2 in. The cooling coil must be installed parallel with or on downstream side of furnace to avoid condensation in heat exchanger.
PAGE 15
1. Determine application being installed from Table 1. 2. Construct hole in floor per dimensions specified in Table 1 and Fig. 18. 3. Construct plenum to dimensions specified in Table 1 and Fig. 18. 4. If downflow subbase (KGASB) is used, install as shown in Fig. 19. If coil assembly CD5 or CK5 or Coil Box KCAKC is used, install as shown in Fig. 20. NOTE: Remove furnace perforated, discharge duct flanges when they interfere with mating flanges on coil on downflow subbase.
PAGE 16
A PLENUM OPENING D B FLOOR OPENING C A96283 Fig. 18—Floor and Plenum Opening Dimensions FURNACE FURNACE (OR COIL CASING WHEN USED) CD5 OR CK5 COIL ASSEMBLY OR KCAKC COIL BOX COMBUSTIBLE FLOORING COMBUSTIBLE FLOORING DOWNFLOW SUBBASE SHEET METAL PLENUM SHEET METAL PLENUM FLOOR OPENING FLOOR OPENING A96284 A96285 Fig. 20—Furnace, Plenum, and Coil Assembly or Coil Box Installed on a Combustible Floor Fig.
PAGE 17
WARNING: FIRE HAZARD A failure to follow this warning could result in fire, personal injury, or death. Never connect return-air ducts to the back of the furnace. Return-air duct connections on furnace side(s) permitted in upflow applications only. PERFORATED DISCHARGE DUCT FLANGE NO YES UPFLOW FURNACES YES The return-air duct must be connected to bottom, sides (left or right), or a combination of bottom and side(s) of main furnace casing as shown in Fig. 2.
PAGE 18
E. Filter Arrangement CAUTION: FIRE, CARBON MONOXIDE AND POISONING HAZARD Failure to follow this warning could result in fire, personal injury, or death. Never operate a unit without a filter or with filter access door removed. Factory-supplied washable framed filters are shipped in blower compartment. Determine location for filter and relocate filter retaining wire if necessary. See Table 2 to determine correct filter size for desired filter location.
PAGE 19
GAS SUPPLY MANUAL SHUTOFF VALVE (REQUIRED) SEDIMENT TRAP UNION BOTTOM CLOSURE PANEL FRONT FILLER PANEL A93324 Fig. 26—Typical Gas Pipe Arrangement A93047 Fig. 25—Removing Bottom Closure Panel WARNING: FIRE OR EXPLOSION HAZARD Failure to follow the safety warnings exactly could result in serious injury, death or property damage. Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections.
PAGE 20
FIELD 24-V WIRING FIELD 115-, 208/230-, 460-V WIRING FACTORY 24-V WIRING FACTORY 115-V WIRING NOTE 2 W FIVE WIRE THREE-WIRE HEATING-ONLY C R G Y THERMOSTAT TERMINALS FIELD-SUPPLIED DISCONNECT 208/230- OR 460-V THREE PHASE BLOWER DOOR SWITCH BLK W BLK WHT WHT GND 115-V FIELDSUPPLIED DISCONNECT GND AUXILIARY J-BOX C O N T R O L R 208/230-V SINGLE PHASE G COM GND NOTE 1 CONDENSING UNIT Y 24-V TERMINAL BLOCK FURNACE TWO WIRE NOTES: 1.
PAGE 21
TABLE 4—ELECTRICAL DATA UNIT SIZE VOLTS— HERTZ— PHASE 024040 036040 024060 036060 048060 036080 048080 060080 048100 060100 060120 060140 115—60—1 115—60—1 115—60—1 115—60—1 115—60—1 115—60—1 115—60—1 115—60—1 115—60—1 115—60—1 115—60—1 115—60—1 OPERATING VOLTAGE RANGE Max* Min* 127 104 127 104 127 104 127 104 127 104 127 104 127 104 127 104 127 104 127 104 127 104 127 104 MAX UNIT AMPS UNIT AMPACITY† MIN WIRE GAGE MAX WIRE LENGTH (FT)‡ MAX FUSE OR CKT BKR AMPS** 6.1 7.3 6.1 7.1 9.5 7.6 10.0 14.
PAGE 22
L E G E N D R Y BHT/CLR COOL —22— GND GV GVR 1, 2 HSI HSIR HUM IDM IDR ILK J1 J2 JB LED LGPS LS BHT/CLR BLWR BLWM CAP 1,2 CPU EAC-1 EAC-2 FRS FSE FU 1 FU 2 BLU (MED LO) HUM START BLWM EAC-1 PL1 RED BRN BRN 1 CAP -1 GRN/YEL PR1 2 PL2 GRN/YEL YEL WHT RED GRN/YEL WHT WHT ORN BLU BLK BLK WHT ILK WHT (COM) BLK FSE RED ORN BLOWER MOTOR SPEED CHANGE RELAY, SPDT BLOWER MOTOR RELAY, SPST-(N.O.
PAGE 23
TWINNING AND/OR COMPONENT TEST TERMINAL BLOWER OFF-DELAY J2 JUMPER BLOWER OFF-DELAY 120 180 90 150 J2 HUMIDIFIER TERMINAL (24-VAC 0.5 AMP MAX.) G Com 24V 24-V THERMOSTAT TERMINALS W TRANSFORMER 24-VAC CONNECTIONS PLT Y TEST/TWIN R HUM 0.
PAGE 24
WARNING: CARBON MONOXIDE POISONING HAZARD 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 or death. The following steps shall be followed for each appliance connected to the venting system being placed into operation, while all other appliances connected to the venting system are not in operation: 1. Seal any unused openings in venting system. 2.
PAGE 25
O Y D Y X H M E V P B I V B B C X L N V R OPE V D FIXE ED CLOS E A R BL OPE G D FIXE ED OS ABLE CL X K V A B J B F A B V Item 25--24--65--2 X AIR SUPPLY INLET VENT TERMINAL Clearance Description AREA WHERE TERMINAL IS NOT PERMITED U.S.
PAGE 26
TABLE 6—APPROVED COMBUSTION-AIR AND VENT PIPE, FITTING AND CEMENT MATERIALS ASTM SPECIFICATION MATERIAL PIPE FITTINGS SOLVENT CEMENT AND PRIMERS DESCRIPTION (MARKED ON MATERIAL) D1527 ABS Pipe — — Schedule-40 D1785 PVC Pipe — — Schedule-40 Solvent D2235 For ABS — — For ABS Cement D2241 PVC Pipe — — SDR-21 & SDR-26 D2466 PVC — Fittings — Schedule-40 D2468 ABS — Fittings — Schedule-40 Solvent D2564 For PVC — — For PVC Cement D2661 ABS Pipe Fittings — DWV at Schedule-40 IPS sizes D2665 PVC Pipe Fittings — DWV
PAGE 27
12″ MIN 12″ MIN VENT PIPE VENT PIPE COMBUSTION-AIR PIPE HORIZONTAL TO ROOF COMBUSTION-AIR PIPE HORIZONTAL TO SIDEWALL COMBUSTION-AIR PIPE VENT PIPE COMBUSTION-AIR PIPE 12″ MIN 12″ MIN VENT PIPE VERTICAL TO ROOF VERTICAL TO SIDEWALL NOTE: A 12 In. minimum offset pipe section is recommended with short (5 to 8 ft) vent systems. This recommendation is to reduce excessive condensate droplets from exiting the vent pipe. A96230 Fig. 34—Short Vent (5 to 8 Ft) System c.
PAGE 28
TABLE 7—MAXIMUM ALLOWABLE PIPE LENGTH (FT) ALTITUDE (FT) 0 to 2000 ALTITUDE (FT) TERMINATION TYPE PIPE DIA (IN.)* 024040 036040 2 Pipe or 2-in Concentric 024060 036060 048060 2 Pipe or 2-in Concentric 036080 048080 060080 2 Pipe or 2-in Concentric 048100 060100 2 Pipe or 3-in Concentric 060120 2 Pipe or 3-in. Concentric 060140 2 Pipe or 3-in. Concentric UNIT SIZE TERMINATION TYPE PIPE DIA (IN.
PAGE 29
TABLE 7—MAXIMUM ALLOWABLE PIPE LENGTH (FT) (CONTINUED) ALTITUDE (FT) 4001 to 5000‡ ALTITUDE (FT) 5001 to 6000‡ ALTITUDE (FT) 6001 to 7000‡ ALTITUDE (FT) 7001 to 8000‡ UNIT SIZE TERMINATION TYPE PIPE DIA (IN.
PAGE 30
TABLE 7—MAXIMUM ALLOWABLE PIPE LENGTH (FT) (CONTINUED) ALTITUDE (FT) UNIT SIZE 024040 036040 8001 to 9000‡ 024060 036060 048060 036080 048080 060080 TERMINATION TYPE PIPE DIA (IN.
PAGE 31
→ 11. Handle pipe joints carefully until cement sets. 12. Support combustion-air and vent piping a minimum of every 5 ft (3 ft for SDR-21 or -26 PVC) using perforated metal hanging strap. 13. Slope combustion-air and vent pipes downward toward furnace a minimum of 1/4 in. per linear ft with no sags between hangers. 14. Use appropriate methods to seal openings where vent and combustion-air pipes pass through roof or side wall. C.
PAGE 32
TABLE 8—MAXIMUM ALLOWABLE EXPOSED VENT PIPE LENGTH (FT) WITH AND WITHOUT INSULATION IN WINTER DESIGN TEMPERATURE AMBIENT* FURNACE SIZE 040 060 080 100 120 140 WINTER DESIGN TEMPERATURE (°F) 20 0 -20 20 0 -20 20 0 -20 20 0 -20 20 0 -20 20 0 -20 20 0 -20 20 0 -20 20 0 -20 20 0 -20 20 0 -20 MAX PIPE DIAMETER (IN.) 1.5 1.5 1.5 2 2 2 2 2 2 2 2 2 2.5 2.5 2.5 2.5 2.5 2.5 3 3 3 3 3 3 4 4 4 3 3 3 4 4 4 WITHOUT INSULATION WITH 3/8–IN.
PAGE 33
ROOF 18″ MAXIMUM BRACKET COUPLING COMBUSTION AIR VERTICAL SEPARATION BETWEEN COMBUSTION AIR AND VENT 8 3/4″ FOR 3″ KIT 6 3/4″ FOR 2″ KIT VENT MAINTAIN 12 IN. MINIMUM CLEARANCE ABOVE HIGHEST ANTICIPATED SNOW LEVEL. MAXIMUM OF 24 IN. ABOVE ROOF. A87224 Fig. 36—Roof Termination (Preferred) OVERHANG OR ROOF 12″ MINIMUM 1″ MAXIMUM VENT COMBUSTION-AIR VENT COMBUSTION AIR MAINTAIN 12 IN. CLEARANCE ABOVE HIGHEST ANTICIPATED SNOW LEVEL OR GRADE, WHICHEVER IS GREATER. MAINTAIN 12 IN. (18 IN.
PAGE 34
A A96128 Fig. 41—Rooftop Termination (Dimension "A" is Touching or 2-In. Maximum Separation) 1″ MAXIMUM (TYP) VENT VENT A COMBUSTION AIR VENT COMBUSTION AIR A VENT A93056 A93057 Fig. 42—Concentric Vent and Combustion-Air Roof Termination (Dimension "A" is Touching or 2-In. Maximum Separation) Fig. 43—Concentric Vent and Combustion-Air Side Termination (Dimension "A" is Touching or 2-In.
PAGE 35
3. Loosely assemble concentric vent/air termination components together using instructions in kit. 4. Slide assembled kit with rain shield REMOVED through hole. NOTE: Do not allow insulation or other materials to accumulate inside of pipe assembly when installing it through hole. Roof terminations—Locate assembly through roof to appropriate height as shown in Fig. 37.
PAGE 36
3. Natural gas service pressure must not exceed 0.5 psig (14-in. wc), but must be no less than 0.16 psig (4.5-in. wc). 4. Blower access panel must be in place to complete 115-v electrical circuit to furnace. CAUTION: UNIT MAY NOT OPERATE Failure to follow this caution may result in intermittent unit operation. These furnaces are equipped with a manual reset limit switch in burner box. This switch will open and shut off power to gas control if an overheat condition (flame rollout) occurs in burner enclosure.
PAGE 37
III. PURGE GAS LINES to hold the gas valve GV open. If the burner flame is not proved within two seconds, the control CPU will close the gas valve GV, and the control CPU will repeat the ignition sequence for up to three more Trials-ForIgnition before going to Ignition-Lockout. Lockout will be reset automatically after three hours, by momentarily interrupting 115 vac power to the furnace, or by interrupting 24 vac power at SEC1 or SEC2 to the furnace control CPU (not at W, G, R, etc.
PAGE 38
D. Heat Pump Mode When installed with a heat pump, the furnace control automatically changes the timing sequence to avoid long blower off times during demand defrost cycles. When the R-to-W-and-Y or R-to-W-andY-and-G circuits are energized the furnace control CPU will continue to turn on the blower motor BLWM at HEAT speed, and begin a heating cycle. The blower motor BLWM will remain on until the end of the prepurge period, then shut off for 24 seconds then come back on at HEAT speed.
PAGE 39
TABLE 9—MODEL 340MAV ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT FOR USE WITH 040 THROUGH 120 SIZE FURNACES ONLY (TABULATED DATA BASED ON 20,000 BTUH PER BURNER, DERATED 2% FOR EACH 1000 FT ABOVE SEA LEVEL) U.S.A. and Canada ALTITUDE RANGE (FT) 0 to 2000 0% derate U.S.A. and Canada ALTITUDE RANGE (FT) U.S.A. Altitudes 2001 to 3000 or Canada Altitudes 2001 to 4500 5% derate U.S.A.
PAGE 40
TABLE 9—MODEL 340MAV ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT (Continued) FOR USE WITH 040 THROUGH 120 SIZE FURNACES ONLY (TABULATED DATA BASED ON 20,000 BTUH PER BURNER, DERATED 2% FOR EACH 1000 FT ABOVE SEA LEVEL) ALTITUDE RANGE (FT) U.S.A. Only 4001 to 5000 0% derate U.S.A. Only ALTITUDE RANGE (FT) 5001 to 6000 11% derate ALTITUDE RANGE (FT) U.S.A.
PAGE 41
TABLE 9—MODEL 340MAV ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT (Continued) FOR USE WITH 040 THROUGH 120 SIZE FURNACES ONLY (TABULATED DATA BASED ON 20,000 BTUH PER BURNER, DERATED 2% FOR EACH 1000 FT ABOVE SEA LEVEL) ALTITUDE RANGE (FT) U.S.A. Only 7001 to 8000 15% derate ALTITUDE RANGE (FT) U.S.A. Only 8001 to 9000 17% derate ALTITUDE RANGE (FT) U.S.A.
PAGE 42
TABLE 10—MODEL 340MAV ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT FOR USE WITH 140 SIZE FURNACES ONLY (TABULATED DATA BASED ON 23,000 BTUH PER BURNER, DERATED 2% FOR EACH 1000 FT ABOVE SEA LEVEL) U.S.A. and Canada ALTITUDE RANGE (FT) 0 to 2000 0% derate U.S.A. and Canada ALTITUDE RANGE (FT) U.S.A. Altitudes 2001to 3000 or Canada Altitude 2001 to 4500 5% derate U.S.A.
PAGE 43
TABLE 10—MODEL 340MAV ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT (Continued) FOR USE WITH 140 SIZE FURNACES ONLY (TABULATED DATA BASED ON 23,000 BTUH PER BURNER, DERATED 2% FOR EACH 1000 FT ABOVE SEA LEVEL) ALTITUDE RANGE (FT) U.S.A. Only 4001 to 5000 9% derate U.S.A. Only ALTITUDE RANGE (FT) 5001 to 6000 11% derate ALTITUDE RANGE (FT) U.S.A.
PAGE 44
TABLE 11—ALTITUDE DERATE MULTIPLIER REGULATOR SEAL CAP REGULATOR ADJUSTMENT SCREW ON/OFF SWITCH REGULATOR SPRING (PROPANE - WHITE, 6 TURNS NATURAL - SILVER, 10 TURNS) INLET PRESSURE TAP GAS PRESSURE REGULATOR ADJUSTMENT ALTITUDE (FT) 0—2000 2001—3000 3001—4000 4001—5000 5001—6000 6001—7000 7001—8000 8001—9000 9001—10,000 % OF DERATE 0 4—6 6—8 8—10 10—12 12—14 14—16 16—18 18—20 DERATE MULTIPLIER FACTOR FOR U.S.A.* 1.00 0.95 0.93 0.91 0.89 0.87 0.85 0.83 0.
PAGE 45
EXAMPLE: 100,000 BTUH INPUT FURNACE INSTALLED AT 4300 FT. Derate Furnace Input Rate Furnace Input Rate X Multiplier = at Installation at Sea Level Factor Altitude 100,000 X 0.91 = 91,000 EXAMPLE: (0—2000 ft altitude) Furnace input from rating plate is 100,000 Btuh.
PAGE 46
D. Set Thermostat Heat Anticipator When using a nonelectronic thermostat, the thermostat heat anticipator must be set to match amp draw of the electrical components in R-W circuit. Accurate amp draw readings can be obtained at thermostat subbase terminals R and W. Fig. 53 illustrates an easy method of obtaining actual amp draw. The amp reading should be taken after blower motor has started and furnace is heating. Connect ammeter wires as shown in Fig. 53.
PAGE 47
CHECKLIST—INSTALLATION LOAD CALCULATION ____________ Heating Load (Btuh) ____________ Cooling Load (Btuh) ____________ Furnace Model Selection Condensate Drain ________ Unit Level or Pitched Forward ________ Internal Tubing Connections Free of Kinks and Traps ________ External Drain Connection Leak Tight and Sloped ________ Condensate Trap Primed before Start-Up ________ Heat Tape Installed if Required COMBUSTION AIR VENT PIPING Termination Location ________ Roof or Sidewall ________ Term
PAGE 48
© 2005 Bryant Heating & Cooling Systems 7310 W. Morris St. Indianapolis, IN 46231 —48— Printed in U.S.A. 340m4013 Catalog No.