Bryant 345MAV manual

NOTE: Read the entire instruction manual before starting the installation. Index Page DIMENSIONAL DRAWING ........................................................2 SAFETY CONSIDERATIONS .....................................................3 Clearances to Combustibles......................................................3 ELECTROSTATIC DISCHARGE (ES[...]

→ 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 A99112 NO TES: 1. Mi[...]

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[...]

recharges your body with static electricity (for example; DO NOT move or shuffle your feet, DO NOT touch un- grounded objects, etc.). 4. If you touch ungrounded objects (recharge your body with static electricity), firmly touch furnace again before touch- ing control or wires. 5. Use this procedure for installed and uninstalled (un- grounded) furna[...]

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 [...]

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[...]

NOTE: See Fig. 5 or 6 or tube routing label on main furnace door to check for proper connections. 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 o[...]

b. Remove and discard UPPER (molded) inducer housing drain tube which was previously connected to conden- sate trap. c. Install cap and clamp on UPPER inducer housing drain connection where molded drain tube was removed. d. Use inducer housing drain tube (violet label and factory- supplied in loose parts bag) to connect LOWER inducer housing drain [...]

C. Condensate Trap Field Drain Attachment Refer to Condensate Drain section for recommendations and procedures. D. Pressure Switch Tubing The LOWER collector box pressure tube (pink label) is factory connected to the pressure switch for use when furnace is installed in UPFLOW applications. This tube MUST be disconnected, extended, rerouted, and the[...]

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[...]

3. Route extended collector box pressure tube behind inducer motor bracket then between inducer motor and pressure switch. 4. Connect collector box pressure tube (green label) to pres- sure switch connection labeled COLLECTOR BOX. 5. Use remaining smaller diameter tube (factory-supplied in loose parts bag) to extend collector box pressure tube (pin[...]

CAUTION: Do not use this furnace during construction when adhesives, sealers, and/or new carpets are being installed and curing. If the furnace is required during construction, use clean outside air for combustion and ventilation. Compounds of chlorine and fluorine, when burned with combustion air, form acids which will cause corrosion of heat exch[...]

III. HAZARDOUS LOCATIONS AIR FOR COMBUSTION AND VENTILATION I. GENERAL Provisions for adequate combustion and ventilation air must be provided in accordance with Section 5.3, Air for Combustion and Ventilation, of the NFGC or applicable provisions of the local building codes. Canadian installations must be in accordance with Section 7 of the NSCNGP[...]

2. If combustion air is taken from outdoors through horizontal ducts, the openings and ducts MUST have at least 1 sq in. of free area per 2000 Btuh of the total input for all equipment within the confined space. (See Fig. 13.) 3. When ducts are used, they must be of the same cross- sectional area as the free area of the openings to which they conne[...]

3. Install another nut on other side of furnace base. (Install flat washer if desired.) 4. Adjust outside nut to provide desired height, and tighten inside nut to secure arrangement. NOTE: Bottom closure must be used when leveling legs are used. See Bottom Closure Panel section. II. INSTALLATION ON A CONCRETE SLAB 1. Construct hole in floor per dim[...]

IV. 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. 19.) Cut han[...]

D. Return Air Connections 1. Upflow Furnaces 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. 1. Bypass humidifier may be attached into unused side return air portion of the furnace casing. DO NOT connect any portion of return-air duct to back of f[...]

To remove bottom closure panel, perform following: 1. Tilt or raise furnace and remove 2 screws holding front filler panel. (See Fig. 22.) 2. Rotate front filler panel downward to release holding tabs. 3. Remove bottom closure panel. 4. Reinstall front filler panel and screws. VIII. GAS PIPING Gas piping must be installed in accordance with nationa[...]

CAUTION: If a flexible connector is required or al- lowed by authority having jurisdiction, black iron pipe shall be installed at gas valve and extend a minimum of 2 in. outside furnace casing. An accessible manual shutoff valve MUST be installed upstream of furnace gas controls and within 6 ft of furnace. A 1/8-in. NPT plugged tapping, accessible [...]

CAUTION: Furnace control must be grounded for proper operation or control will lock out. Control is grounded through green wire routed to gas valve and burner box screw. I. 115-V WIRING Before proceeding with electrical connections, make certain that voltage, frequency, and phase correspond to that specified on unit rating plate. Also, check to be [...]

Fig. 26—Wiring Diagram A99106 PCB BLOWER OFF DELAY SELECTION CHART 90 SEC 135 SE C 180 SE C 225 SE C GVR HI / L O RE LA Y SEC-1 SEC-2 WHT PL1 32 1 6 5 4 9 87 LED TEST/TWIN BLOWER OFF DEL AY G R Y W C HUM H S IR ID R B L W R BLOWER SPEED SELECT FU1 COOL HEAT L2 PL3 PL2 VAC 120 L1 PR1 1 2 1 2 3 PR2 24 V AC - 3A FUS E SPARE-2 SPARE-1 EAC-1 EAC-2 C 1[...]

II. 24-V WIRING Make field 24-v thermostat connections at 24-v terminal block on control center. For proper cooling operation, Y wire from thermo- stat MUST be connected to Y terminal on control center, as shown in Fig. 24. The 24-v terminal board is marked for easy connection of field wiring. (See Fig. 26.) The 24-v circuit contains a 3-amp, autom[...]

7. If improper venting is observed during any of above tests, the venting system must be corrected. Vent system or vent connectors may need to be resized. For any other appliances when resizing vent systems or vent connectors, system or connector must be sized to approach minimum size determined in appropriate table in NFGC or NSCNGPIC. II. COMBUST[...]

NOTE: Do not attach combustion-air intake pipe permanently to combustion-air intake housing since it may be necessary to remove pipe for service of ignitor or flame sensor. The combustion-air intake plug fitting must be installed in unused combustion-air intake housing. This fitting must be attached by using RTV sealant, or by drilling a 1/8-in. ho[...]

TABLE 4—MAXIMUM ALLOWABLE VENT PIPE LENGTH (FT) ALTITUDE (FT) UNIT SIZE VENT PIPE DIAMETER (IN.) NUMBER OF 90° ELBOWS 1 23456 0 to 2000 024040 036040 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 1-1/2 20 15 10 5 NA NA 2 7 0 7 07 07 07 07 0 036080 048080 060080 1-1/2 10 NA NA NA NA NA 2 5 5 5 03 53 03 02 0[...]

TABLE 4—MAXIMUM ALLOWABLE VENT PIPE LENGTH (FT) Continued ALTITUDE (FT) UNIT SIZE VENT PIPE DIAMETER (IN.) NUMBER OF 90° ELBOWS 1 2 3456 5001 to 6000† 024040 036040 1-1/2 57 52 47 42 40 35 2 7 0 7 0 7 07 07 07 0 024060 036060 048060 1-1/2 14 9 NA NA NA NA 2 6 0 5 5 5 44 94 84 7 036080 048080 060080 2 4 1 3 6 2 31 81 7 8 2-1/2 70 70 70 70 70 70[...]

Fig. 32—Short Vent (5 to 8 Ft) System A96189 HORIZONTAL TO ROOF HORIZONTAL TO SIDEWALL VERTICAL TO SIDEWALL VERTICAL TO ROOF VENT PIPE VENT PIPE VENT PIPE VENT PIPE 12 ″ MIN 12 ″ MIN 12 ″ MIN 12 ″ MIN NOTE : A 12-In. minimum offset pipe section is recommended with short (5 to 8 ft) vent systems. This recommendation is to reduce excessive [...]

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, fire, personal injury, or death. 3. Install pipe support (factory-supplied in loose parts bag) into selected furnace casing vent[...]

15. Slope vent pipe toward furnace a minimum of 1/4 in. per linear ft with no sags between hangers. 16. Use appropriate methods to seal openings where vent pipe passes through roof or sidewall. D. Extended Exposed Sidewall Pipes Sidewall vent pipe termination may be extended beyond area shown in Fig. 34 in outside ambient by insulating pipe as indi[...]

Fig. 35—Sidewall Termination with Straight Pipe A96210 MAINTAIN 12-IN.  CLEARANCE ABOVE HIGHEST ANTICIPATED SNOW LEVEL OR GRADE, WHICHEVER IS GREATER. VENT 12 ″ MINIMUM OVERHANG OR ROOF 6-IN. MINIMUM CLEARANCE BETWEEN WALL AND END OF VENT PIPE. 10-IN. MAXIMUM PIPE LENGTH Fig. 34—Sidewall Termination with 2 Elbows[...]

4. Wrap field drain pipe with remaining heat tape, approxi- mately 1 wrap per ft. 5. When using field-supplied heat tape, follow heat tape manufacturer’s instructions for all other installation guide- lines. SEQUENCE OF OPERATION CAUTION: Furnace control must be grounded for proper operation, or control will lock out. Control is grounded through [...]

V. COMPONENT TEST A. Component Test Sequence NOTE: All components are functionally operated except the gas valve. When component test is initiated, the following sequence of events occurs: 1. LED flashes a status code 4 times. 2. Inducer motor starts and continues to run for remainder of component test. 3. Hot surface ignitor is energized for 15 se[...]

5. Remove funnel and tube from inducer housing and replace drain connection cap and clamp. 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 checki[...]

TABLE 7—MODEL 345MAV ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT (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 No. Manifold Pressure Orifice No. Manifold Pressur[...]

TABLE 7—MODEL 345MAV ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT Continued (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 No. Manifold Pressure Orifice No. Manifo[...]

TABLE 7—MODEL 345MAV ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT Continued (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 No. Manifold Pressure Orifice No. Manifo[...]

b. Remove cap that conceals adjustment screw for gas valve regulator. (See Fig. 40.) c. Turn adjusting screw, counterclockwise (out) to decrease manifold pressure or clockwise (in) to increase manifold pressure. NOTE: This furnace has been approved for a manifold pressure of 3.2 in. wc to 3.8 in. wc when installed at altitudes up to 2000 ft. For al[...]

c. Measure time (in sec) for gas meter test dial to complete 1 revolution. d. Refer to Table 9 for cu ft of gas per hr. e. Multiply gas rate (cu ft/hr) X heating value (Btu/cu ft) using natural gas heating value from local gas utility/supplier. EXAMPLE: Btu heating input = Btu/cu ft X cu ft/hr Heating value of gas = 975 Btu/cu ft Time for 1 revolut[...]

CHECK SAFETY CONTROLS I. CHECK PRIMARY LIMIT CONTROL This control shuts off combustion control system and energizes air-circulating blower motor if furnace overheats. Recommended method of checking this limit control is to gradually block off return air after furnace has been operating for a period of at least 5 minutes. As soon as limit control ha[...]

CHECKLIST—INSTALLATION LOAD CALCULATION ________ Heating Load (Btuh) ________ Cooling Load (Btuh) ________ Furnace Model Selection VENT PIPING Termination Location ________ Roof or Sidewall ________ Vent Pipe Length ________ Vent Pipe Elbow Quantity ________ Pipe Diameter Determined from Sizing Table ________ Pipe Sloped To Furnace Pipe Insulatio[...]