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Bryant 340MAV - page 1
NOTE: Read the entire instruction manual before starting the installation. This symbol → indicates a change since the last issue. Index Page DIMENSIONAL DRAWING ........................................................2 SAFETY CONSIDERATIONS .....................................................3 Clearances to Combustibles.......................... ...
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Bryant 340MAV - page 2
Fig. 2—Dimensional Drawing DIMENSIONS (IN.) UNIT SIZE A D E 024040 17-1/2 15-7/8 16 036040 17-1/2 15-7/8 16 024060 17-1/2 15-7/8 16 036060 17-1/2 15-7/8 16 048060 17-1/2 15-7/8 16 036080 17-1/2 15-7/8 16 048080 17-1/2 15-7/8 16 060080 21 19-3/8 19-1/2 048100 21 19-3/8 19-1/2 060100 21 19-3/8 19-1/2 060120 24-1/2 22-7/8 23 → 060140 24-1/2 22-7/8 ...
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Bryant 340MAV - page 3
SAFETY CONSIDERATIONS Installing and servicing heating equipment can be hazardous due to gas and electrical components. Only trained and qualified person- nel should install, repair, or service heating equipment. Untrained personnel can perform basic maintenance functions such as clean- ing and replacing air filters. All other operations must be pe ...
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Bryant 340MAV - page 4
6. Before removing a new control from its container, dis- charge 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 touchin ...
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Bryant 340MAV - page 5
and also by a color label on each tube. These tubes are identified as follows: collector box drain tube (blue label), inducer housing drain tube (violet label or molded), relief port tube (green label), and pressure switch tube (pink label). 2. Condensate Trap Drain Tube The condensate trap drain connection must be extended for field attachment by ...
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Bryant 340MAV - page 6
D. Condensate Trap Tubing (Alternate Upflow Orientation) NOTE: See Fig. 6 or tube routing label on main furnace door to confirm location of these tubes. 1. Collector Box Drain Tube Connect collector box drain tube (blue label) to condensate trap. NOTE: On 17-1/2-in. wide furnaces ONLY, cut tube between corrugated sections to prevent kinks from occu ...
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Bryant 340MAV - page 7
H. Condensate Trap Freeze Protection Refer to Condensate Drain Protection section for recommenda- tions and procedures. III. DOWNFLOW APPLICATIONS A downflow furnace application is where furnace blower is located above combustion and controls section of furnace, and conditioned air is discharged downwards. A. Condensate Trap Location The condensate ...
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Bryant 340MAV - page 8
d. Use inducer housing drain tube (violet label and factory- supplied in loose parts bag) to connect LOWER inducer housing drain connection to the condensate trap. e. Connect inducer housing drain connection to condensate trap. (1.) Condensate Trap Located on Left Side of Casing (a.) Determine appropriate length and cut. (b.) Connect tube to conden ...
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Bryant 340MAV - page 9
CAUTION: Local codes may require a drain pan under entire furnace and condensate trap when a condensing furnace is used in an attic application or over a finished ceiling. NOTE: In Canada, installations shall be in accordance with current NSCNGPIC and/or local codes. NOTE: The auxiliary junction box (J-Box) MUST be relocated to opposite side of fur ...
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Bryant 340MAV - page 10
1. Remove 3 tubes connected to condensate trap. 2. Remove trap from blower shelf by gently pushing tabs inward and rotating trap. 3. Remove casing hole filler cap from casing hole. (See Fig. 2 or 11.) 4. Install casing hole filler cap into blower shelf hole where trap was removed. 5. Install condensate trap into casing hole by inserting tube connec ...
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Bryant 340MAV - page 11
2. Extend collector box pressure tube (green label) which was previously connected to condensate trap relief port connec- tion by splicing to small diameter tube (factory-supplied in loose parts bag). 3. Route extended collector box pressure tube behind inducer motor bracket then between inducer motor and pressure switch. 4. Connect collector box p ...
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Bryant 340MAV - page 12
CAUTION: If these furnaces are used during construc- tion when adhesives, sealers, and/or new carpets are being installed, make sure all combustion and circulating air requirements are followed. If operation of furnace is required during construction, use clean outside air for combustion and ventilation. Compounds of chlorine and fluorine, when bur ...
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Bryant 340MAV - page 13
INSTALLATION I. LEVELING LEGS (IF DESIRED) When furnace is used in upflow position with side inlet(s), leveling legs may be desired. (See Fig. 12.) Install field-supplied, corrosion-resistant 5/16-in. machine bolts and nuts. NOTE: The maximum length of bolt should not exceed 1-1/2 in. 1. Position furnace on its back. Locate and drill a 5/16-in. dia ...
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Bryant 340MAV - page 14
TABLE 1—OPENING DIMENSIONS (IN.) FURNACE CASING WIDTH APPLICATION PLENUM OPENING FLOOR OPENING AB C D 17-1/2 Upflow Applications 16 24-1/8 16-5/8 24-3/4 Downflow Applications on Non-Combustible Flooring 15-7/8 19 16-1/2 19-5/8 Downflow Applications on Combustible Flooring Using KGASB Subbase Furnace with or without CD5 or CK5 Coil Assembly or KCA ...
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Bryant 340MAV - page 15
III. INSTALLATION IN HORIZONTAL APPLICATIONS These furnaces can be installed horizontally in either horizontal left or right discharge position. In a crawlspace, 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 and angle iron supports. (See Fig. 17.) Cut ha ...
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Bryant 340MAV - page 16
IV. FILTER ARRANGEMENT CAUTION: Never operate unit without a filter or with blower access panel 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. Table 2 indicate ...
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Bryant 340MAV - page 17
VI. GAS PIPING Gas piping must be installed in accordance with national and local codes. Refer to current edition of NFGC. Canadian installations must be made in accordance with NSCNGPIC and all authorities having jurisdiction. Gas supply line should be a separate line running directly from meter to furnace, if possible. Refer to Table 3 for recomm ...
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Bryant 340MAV - page 18
NOTE: Proper polarity must be maintained for 115-v wiring. If polarity is incorrect, control center LED status indicator light will flash rapidly and furnace will NOT operate. WARNING: The cabinet MUST have an uninterrupted or unbroken ground according to NEC ANSI/NFPA 70-1996 and Canadian Electrical Code CSA C22.1 or local codes to minimize person ...
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Bryant 340MAV - page 19
Fig. 24—Wiring Diagram A95087 PCB BLOWER OFF DELAY SELECTION CH AR T 90 SEC 135 SEC 180 SEC 225 SEC GVR HI/LO RELAY SEC-1 SEC- 2 WHT PL1 3 2 1 6 5 4 9 87 LED TEST/TWIN BLOWER OFF DELAY G R Y W C HUM HSIR IDR BLWR BLOWER SPEED SELECT FU1 COOL HEAT L2 PL3 PL2 VAC 120 L1 PR1 1 2 1 2 3 PR2 24 VAC-3A FUSE SPARE-2 SPARE-1 EAC-1 EAC-2 C 1.5 AMP 12 PL5 W ...
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Bryant 340MAV - page 20
III. ACCESSORIES 1. Electronic Air Cleaner (EAC) Two quick-connect terminals marked EAC-1 and EAC-2 are provided for EAC connection. (See Fig. 25.) These terminals are energized with 115v (1.5-amp maximum) during blower motor operation. 2. Humidifier (HUM) A quick-connect terminal (HUM) and screw terminal (C OM ) are provided for 24-v humidifier co ...
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Bryant 340MAV - page 21
DIRECT VENTING The 340MAV Furnaces require a dedicated (one 340MAV furnace only) direct-vent system. In a direct-vent system, all air for combustion is taken directly from outside atmosphere, and all flue products are discharged to outside atmosphere. I. REMOVAL OF EXISTING FURNACES FROM COMMON VENT SYSTEMS If furnace being replaced was connected t ...
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Bryant 340MAV - page 22
CAUTION: When combustion-air pipe is installed above a suspended ceiling, pipe must be insulated with 3/8-in. thick Armaflex-type insulation. Combustion-air pipe should also be insulated when it passes through warm, humid space. CAUTION: When vent pipe is exposed to temperatures below freezing, such as when it passes through an unheated space or wh ...
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Bryant 340MAV - page 23
f. Drill a 1/8-in. hole in 2-in. combustion-air pipe using hole in intake housing as a guide. g. Install a field-supplied No. 6 or No. 8 sheet metal screw into combustion-air pipe. NOTE: DO NOT OVERTIGHTEN SCREW. Breakage to intake housing or fitting may cause air leakage to occur. NOTE: Do not attach combustion-air intake pipe permanently to combu ...
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Bryant 340MAV - page 24
TABLE 6—MAXIMUM ALLOWABLE PIPE LENGTH (FT) ALTITUDE UNIT SIZE TERMINATION TYPE PIPE DIA (IN.)* NUMBER OF 90° ELBOWS 1 23456 0 to 2000 024040 036040 2 Pipe or 2-In. Concentric 1 5 NA NA NA NA NA 1-1/2 70 70 65 60 60 55 2 7 0 7 07 07 07 07 0 024060 036060 048060 2 Pipe or 2-In. Concentric 1-1/2 20 15 10 5 NA NA 2 7 0 7 07 07 07 07 0 036080 048080 ...
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Bryant 340MAV - page 25
TABLE 6—MAXIMUM ALLOWABLE PIPE LENGTH (FT) Continued ALTITUDE UNIT SIZE TERMINATION TYPE PIPE DIA (IN.)* NUMBER OF 90° ELBOWS 123 4 5 6 4001 to 5000‡ 024040 036040 2 Pipe or 2-In. Concentric 1-1/2 60 55 50 45 44 39 2 7 07 07 0 7 0 7 0 7 0 024060 036060 048060 2 Pipe or 2-In. Concentric 1-1/2 15 10 5 NA NA NA 2 6 45 95 8 5 3 5 2 5 2 036080 0480 ...
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Bryant 340MAV - page 26
b. Reposition neoprene inducer housing outlet cap and clamp to appropriate unused inducer housing connec- tion. Tighten clamp. WARNING: Inducer housing outlet cap must be in- stalled and fully seated against inducer housing. Clamp must be tightened to prevent any condensate leakage. Failure to follow this warning could result in electrical shock, f ...
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Bryant 340MAV - page 27
9. While cement is still wet, twist pipe into socket with 1/4 turn. Be sure pipe is fully inserted into fitting socket. 10. Wipe excess cement from joint. A continuous bead of cement will be visible around perimeter of a properly made joint. 11. Handle pipe joints carefully until cement sets. 12. Support combustion-air and vent piping a minimum of ...
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Bryant 340MAV - page 28
Fig. 33—Sidewall Termination of 12 in. or More A87225 MAINTAIN 12 IN. CLEARANCE ABOVE HIGHEST ANTICIPATED SNOW LEVEL OR GRADE, WHICHEVER IS GREATER. 90 ° VENT 12 IN. SEPARATION BETWEEN BOTTOM OF COMBUSTION AIR AND BOTTOM OF VENT BRACKET COMBUSTION-AIR 12 ″ MINIMUM OVERHANG OR ROOF Fig. 31—Concentric Vent and Combu ...
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Bryant 340MAV - page 29
2. Cut 2 holes, 1 for each pipe, of appropriate size for pipe size being used. 3. Loosely install elbow in bracket and place assembly on combustion-air pipe. Roof terminations —Loosely install pipe coupling on prop- erly cut vent pipe. Coupling must be positioned so bracket will mount as shown in Fig. 30. For applications using combustion-air pip ...
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Bryant 340MAV - page 30
Fig. 38—Sidewall Termination of 12 in. or Less (Dimension "A" is Touching or 2-In. Maximum Separation) A96129 A COMBUSTION AIR COMBUSTION AIR VENT Fig. 36—Concentric Vent and Combustion-Air Roof Termination (Dimension "A" is Touching or 2-In. Maximum Separation) A93056 COMBUSTION AIR VENT VENT A Fig. 35—Rooftop Terminat ...
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Bryant 340MAV - page 31
See Fig. 40 for example of possible field drain attachment using 1/2-in. CPVC or PVC tee for vent and A/C or humidifier drain connection. Outdoor draining of the furnace is permissible if allowed by local codes. Caution should be taken when freezing ambient may freeze drain pipe and prohibit draining. WARNING: Caution should be taken to prevent dra ...
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Bryant 340MAV - page 32
6. Blower off delay —When thermostat is satisfied, circuit between R-W is opened, de-energizing gas valve (stopping gas flow to burners) and humidifier. Blower motor and electronic air cleaner remain energized for 135 sec. 7. Post purge —Inducer motor remains energized 15 sec after burners are extinguished (5 sec if jumper has been cut for 140 ...
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Bryant 340MAV - page 33
WARNING: Blower access panel door switch opens 115-v power to control center. No component operation can occur. Caution must be taken when manually closing this switch for service purposes. Failure to follow this warning could result in electrical shock, personal injury, or death. 4. BRIEFLY short (jumper) TEST, 1/4-in. quick-connect terminal on co ...
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Bryant 340MAV - page 34
III. PURGE GAS LINES If not previously done, purge lines after all connections have been made and check for leaks. WARNING: Never purge a gas line into a combustion chamber. Never use matches, candles, flame, or other sources of ignition for purpose of checking leakage. Use a soap-and-water solution to check for leakage. Failure to follow this warn ...
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Bryant 340MAV - page 35
→ TABLE 8—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) ALTITUDE RANGE (FT) AVG GAS HEAT VALUE AT ALTITUDE (BTU/CU FT) SPECIFIC GRAVITY OF NATURAL GAS 0.58 0.60 0.62 0.64 0.66 Orifice ...
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Bryant 340MAV - page 36
→ TABLE 8—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) AVG GAS HEAT VALUE AT ALTITUDE (BTU/CU FT) SPECIFIC GRAVITY OF NATURAL GAS 0.58 0.60 0.62 0.64 0.6 ...
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Bryant 340MAV - page 37
→ TABLE 8—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) AVG GAS HEAT VALUE AT ALTITUDE (BTU/CU FT) SPECIFIC GRAVITY OF NATURAL GAS 0.58 0.60 0.62 0.64 0.6 ...
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Bryant 340MAV - page 38
→ TABLE 9—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) ALTITUDE RANGE (FT) AVG GAS HEAT VALUE AT ALTITUDE (BTU/CU FT) SPECIFIC GRAVITY OF NATURAL GAS 0.58 0.60 0.62 0.64 0.66 Orifice No. Manifold ...
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Bryant 340MAV - page 39
→ TABLE 9—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) AVG GAS HEAT VALUE AT ALTITUDE (BTU/CU FT) SPECIFIC GRAVITY OF NATURAL GAS 0.58 0.60 0.62 0.64 0.66 Orifice No ...
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Bryant 340MAV - page 40
f. Look through sight glass in burner enclosure and check burner flame. Burner flame should be clear blue, almost transparent. (See Fig. 45.) 3. Verify natural gas input rate by clocking gas meter. NOTE: Be sure all pressure tubing, combustion-air and vent pipes, and burner enclosure front are in place when checking input by clocking gas meter. a. ...
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Bryant 340MAV - page 41
3. Adjust temperature rise by adjusting blower speed. Increase blower speed to reduce temperature rise. Decrease blower speed to increase temperature rise. WARNING: Disconnect 115-v electrical power before changing speed tap. Failure to follow this warning could result in personal injury. 4. To change blower motor speed selections for heating mode, ...
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Bryant 340MAV - page 42
CHECKLIST—INSTALLATION LOAD CALCULATION ____________ Heating Load (Btuh) ____________ Cooling Load (Btuh) ____________ Furnace Model Selection COMBUSTION AND VENT PIPING Termination Location ________ Roof or Sidewall ________ Termination Kit — 2 Pipe or Concentric ________ Combustion-Air Pipe Length ________ Combustion-Air Pipe Elbow Quantity _ ...
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Bryant 340MAV - page 43
—43— ...
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Bryant 340MAV - page 44
A94328 SERVICE TRAINING Packaged Service Training programs are an excellent way to increase your knowledge of the equipment discussed in this manual, including: • Unit Familiarization • Maintenance • Installation Overview • Operating Sequence A large selection of product, theory, and skills programs is availa ...
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