Bryant 345MAV Installation, Start-Up, And Operating Instructions Manual
Series f 4-way multipoise fixed-capacity condensing gas furnace
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- Installation, start-up, and operating instructions manual (40 pages) ,
- Service and maintenance procedures manual (16 pages) ,
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Table of Contents
DIMENSIONAL DRAWING........................................................2
SAFETY CONSIDERATIONS .....................................................3
Clearances to Combustibles......................................................3
CODES AND STANDARDS........................................................4
INTRODUCTION ..........................................................................5
APPLICATIONS............................................................................5
General ......................................................................................5
Upflow Applications.................................................................6
Downflow Applications ............................................................7
Horizontal Left (Supply-Air Discharge) Applications ............9
LOCATION..................................................................................12
General ....................................................................................12
Furnace Location Relative to Cooling Equipment ................13
Hazardous Locations...............................................................13
AIR FOR COMBUSTION AND VENTILATION ....................13
General ....................................................................................13
Unconfined Space ...................................................................14
Confined Space .......................................................................14
INSTALLATION .........................................................................15
Leveling Legs (If Desired) .....................................................15
Installation In Upflow or Downflow Applications................17
Installation In Horizontal Applications ..................................17
Air Ducts.................................................................................17
General Requirements .......................................................17
Ductwork Acoustical Treatment .......................................17
Supply Air Connections ....................................................17
Return Air Connections.....................................................18
Filter Arrangement ............................................................18
Bottom Closure Panel........................................................19
Gas Piping..........................................................................19
Electrical Connections ............................................................20
115-v Wiring......................................................................21
24-v Wiring........................................................................21
Accessories ........................................................................22
Venting ....................................................................................22
Vent Systems .....................................................................22
Combustion-Air and Vent Piping .....................................23
Vent Termination...............................................................31
Multiventing.......................................................................31
installation, start-up,
and operating instructions
4-WAY MULTIPOISE
FIXED-CAPACITY
CONDENSING GAS FURNACE
A93040
Page
-1-
Cancels: II 345M-40-7
UPFLOW
HORIZONTAL
LEFT
DOWNFLOW
AIRFLOW
Fig. 1-Multipoise Orientations
As an ENERGY STAR® Part-
ner, BRYANT Heating & Cool-
ing Systems Company has de-
termined that this product meets
the ENERGY STAR® guide-
lines for energy efficiency.
REGISTERED QUALITY SYSTEM
Condensate Drain....................................................................31
General...............................................................................31
Application.........................................................................33
Condensate Drain Protection.............................................33
SAFETY CHECK...................................................................33
General...............................................................................33
Prime Condensate Trap With Water.................................34
Purge Gas Lines ................................................................34
Sequence of Operation ......................................................34
Heating Mode...............................................................34
Cooling Mode...............................................................35
Continuous Blower Mode ............................................35
Heat Pump Mode .........................................................35
Component Test ...........................................................35
Adjustments .......................................................................36
Set Gas Input Rate .......................................................36
Set Temperature Rise...................................................40
Blower Off Delay (Heat Mode) ..................................41
Set Thermostat Heat Anticipator .................................41
Check Safety Controls.......................................................41
Check Primary Limit Control ......................................41
345MAV
Series F
II 345M-40-8
12-03
AIRFLOW
HORIZONTAL
RIGHT
AIRFLOW
AIRFLOW
A93041
ama
CERTIFIED
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Summary of Contents for Bryant 345MAV
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Page 1: Table Of Contents
Horizontal Right (Supply-Air Discharge) Applications ..11 LOCATION..................12 General ..................12 As an ENERGY STAR® Part- Furnace Location Relative to Cooling Equipment ....13 ner, BRYANT Heating & Cool- ing Systems Company has de- Hazardous Locations...............13 termined that this product meets the ENERGY STAR® guide- AIR FOR COMBUSTION AND VENTILATION ....13... -
Page 2: Dimensional Drawing
Check Pressure Switch..........41 be performed by trained service personnel. When working on CHECKLIST..............42 heating equipment, observe precautions in literature, on tags, and on labels attached to or shipped with unit and other safety SAFETY CONSIDERATIONS precautions that may apply. These instructions cover the minimum requirements and conform CAUTION: Application of this furnace should be in- to existing national standards and safety codes. -
Page 3: Clearances To Combustibles
—3—... -
Page 4: Codes And Standards
is used to identify unsafe practices which would result in minor Installer Packet includes: personal injury or product and property damage. NOTE is used to Installation, Startup, and Operating Instructions highlight suggestions which will result in enhanced installation, Service and Maintenance Instructions reliability, or operation. -
Page 5: Electrostatic Discharge (Esd) Precautions
FURNACE BLOWER SHELF CONDENSATE DOOR TRAP FURNACE CONDENSATE DOOR FURNACE TRAP (INSIDE) FURNACE SIDE SIDE FIELD FIELD DRAIN DRAIN CONN CONN ALTERNATE DRAIN TUBE LOCATION SIDE VIEW FRONT VIEW END VIEW FRONT VIEW CONDENSATE TRAP DRAIN TUBE LOCATION DOWNFLOW AND ALTERNATE HORIZONTAL UPFLOW APPLICATIONS APPLICATIONS... -
Page 6: Upflow Applications
PLUG PLUG COLLECTOR BOX COLLECTOR BOX DRAIN TUBE (BLUE DRAIN TUBE (BLUE & WHITE STRIPED) & WHITE STRIPED) COLLECTOR BOX COLLECTOR BOX TUBE (PINK) TUBE (PINK) COLLECTOR BOX COLLECTOR BOX TUBE (GREEN) TUBE (GREEN) INDUCER HOUSING COLLECTOR BOX (MOLDED) DRAIN DRAIN TUBE (BLUE) TUBE (BEHIND COLLECTOR BOX... -
Page 7: Downflow Applications
C. Condensate Trap Location (Alternate Upflow G. Upper Collector Box and Inducer Housing (Unused) Orientation) Drain Connections An alternate location for the condensate trap is the left-hand side UPPER COLLECTOR BOX DRAIN CONNECTION of casing. (See Fig. 2 and 7.) Attached to the UPPER collector box drain connection is a NOTE: If the alternate left-hand side of casing location is used, factory-installed corrugated, plugged tube (blue and white striped... - Page 8 COLLECTOR BOX DRAIN TUBE (BLUE) PLUG PLUG COLLECTOR BOX TUBE (GREEN) COLLECTOR BOX COLLECTOR BOX DRAIN TUBE (BLUE) EXTENSION TUBE COLLECTOR BOX COLLECTOR BOX TUBE (PINK) TUBE (PINK) COLLECTOR BOX TUBE (GREEN) COLLECTOR BOX COLLECTOR BOX DRAIN TUBE (BLUE EXTENSION TUBE &...
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Page 9: Horizontal Left (Supply-Air Discharge) Applications
2. Use smaller diameter tube (factory-supplied in loose parts 1. Remove 3 tubes connected to condensate trap. bag) to extend collector box pressure tube (green label) 2. Remove trap from blower shelf by gently pushing tabs which was previously connected to condensate trap relief inward and rotating trap. - Page 10 A 3-IN. MINIMUM CLEARANCE VENT TO COMBUSTION-AIR INTAKE IS REQUIRED. COMBUSTION–AIR INTAKE 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. 30-IN. MIN WORK AREA ⁄...
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Page 11: Horizontal Right (Supply-Air Discharge) Applications
COLLECTOR BOX DRAIN TUBE (BLUE) COLLECTOR BOX TUBE (GREEN) COLLECTOR BOX EXTENSION TUBE PLUG COLLECTOR BOX TUBE (PINK) 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. -
Page 12: Location
E. Condensate Trap Freeze Protection b. Remove and discard UPPER (molded) inducer housing drain tube which was previously connected to conden- Refer to Condensate Drain Protection section for recommenda- sate trap. tions and procedures. c. Install cap and clamp on UPPER inducer housing drain F. -
Page 13: Furnace Location Relative To Cooling Equipment
• be provided with ample space for servicing and cleaning. Always comply with minimum fire protection clearances shown on the furnace clearance-to-combustibles label. NOTE: For upflow/downflow applications install furnace so that it is level or pitched forward within 1/2-in. for proper furnace operation. -
Page 14: Unconfined Space
and ventilation openings must be sized the same as for a confined space as defined below. Return air must not be taken from the room unless an equal or greater amount of air is supplied to the room. III. CONFINED SPACE A confined space has a volume of less than 50 cu ft per 1000 Btuh of the total input rating for all appliances installed in that space. -
Page 15: Installation
NOTE: The maximum length of bolt should not exceed 1-1/2 in. 1 SQ IN. PER 4000 DUCTS BTUH * OUTDOORS SUPPLY VENT THROUGH ROOF OR SIDEWALL 12 MAX 1 SQ IN. VENT PER 2000 THROUGH SUPPLY BTUH * ROOF 12 MAX 1 SQ IN. - Page 16 PLENUM OPENING FLOOR OPENING A96283 Fig. 20—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 SHEET METAL SUBBASE PLENUM SHEET METAL FLOOR PLENUM OPENING FLOOR OPENING...
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Page 17: Installation In Upflow Or Downflow Applications
1. Position furnace on its back. Locate and drill a 5/16-in. diameter hole in each bottom corner of furnace. (See Fig. PERFORATED DISCHARGE DUCT 19.) Holes in bottom closure panel may be used as guide FLANGE locations. 2. For each hole, install nut on bolt and then install bolt and nut in hole. -
Page 18: Return Air Connections
DOWNFLOW FURNACES WARNING: Never connect return-air ducts to the back Connect supply-air duct to supply-air opening on furnace. The of the furnace. Return-air duct connections on furnace supply-air duct attachment must ONLY be connected to furnace side(s) permitted in upflow applications only. A failure to supply/outlet or air conditioning coil casing (when used), when follow this warning could result in fire, personal injury, or installed on non-combustible material. -
Page 19: Bottom Closure Panel
Factory-supplied washable framed filters are shipped in blower CAUTION: Connect gas pipe to furnace using a backup compartment. Determine location for filter and relocate filter wrench to avoid damaging gas controls. Failure to follow retaining wire if necessary. See Table 2 to determine correct filter this caution will result in intermittent unit operation or size for desired filter location. -
Page 20: Electrical Connections
WARNING: Gas valve ON and OFF switch MUST be CAUTION: If a flexible connector is required or al- facing forward or tilted upward. (See Fig. 46.) Failure to lowed by authority having jurisdiction, black iron pipe follow this warning could result in property damage or shall be installed at furnace gas control valve and extend death. -
Page 21: 115-V Wiring
TABLE 4—ELECTRICAL DATA OPERATING VOLTS— UNIT UNIT MAX WIRE MAX FUSE OR VOLTAGE RANGE HERTZ— UNIT WIRE SIZE AMPACITY† LENGTH (FT)‡ CKT BKR AMPS** PHASE AMPS SIZE Max* Min* 024040 115—60—1 036040 115—60—1 10.0 024060 115—60—1 036060 115—60—1 048060 115—60—1 12.8 036080 115—60—1... -
Page 22: Accessories
FIELD 24-V WIRING FIELD 115-, 208/230-, 460-V WIRING FACTORY 24-V WIRING FACTORY 115-V WIRING NOTE 2 THERMOSTAT FIVE WIRE FIELD-SUPPLIED TERMINALS DISCONNECT THREE-WIRE HEATING-ONLY 208/230- OR BLOWER DOOR SWITCH 460-V THREE PHASE 208/230-V SINGLE PHASE AUXILIARY 115-V FIELD- J-BOX SUPPLIED NOTE 1 DISCONNECT CONDENSING... -
Page 23: Combustion-Air And Vent Piping
TABLE 5—APPROVED COMBUSTION-AIR AND VENT PIPE, FITTING AND CEMENT MATERIALS ASTM SPECIFICATION MATERIAL PIPE FITTINGS SOLVENT CEMENT AND PRIMERS DESCRIPTION (MARKED ON MATERIAL) D1527 Pipe — — Schedule-40 D1785 Pipe — — Schedule-40 Solvent D2235 For ABS — — For ABS Cement D2241 Pipe... - Page 24 PRINTED CIRCIUT BOARD TRAN NEUTRAL NOTE PRINTED CIRCIUT BOARD —24—...
- Page 25 TABLE 6—MAXIMUM ALLOWABLE PIPE LENGTH (FT) NUMBER OF 90° ELBOWS TERMINATION PIPE DIA ALTITUDE (FT) UNIT SIZE TYPE (IN.)* 024040 2 Pipe or 2-in 1-1/2 036040 Concentric 024060 1-1/2 2 Pipe or 2-in 036060 Concentric 048060 1-1/2 036080 2 Pipe or 2-in 048080 0 to 2000 Concentric...
- Page 26 TABLE 6—MAXIMUM ALLOWABLE PIPE LENGTH (FT) (CONTINUED) NUMBER OF 90° ELBOWS TERMINATION PIPE DIA ALTITUDE (FT) UNIT SIZE TYPE (IN.)* 1-1/2 024040 2 Pipe or 2-in 036040 Concentric 024060 1-1/2 2 Pipe or 2-in 036060 Concentric 048060 036080 2 Pipe or 2-in 4001 to 5000‡...
- Page 27 TABLE 6—MAXIMUM ALLOWABLE PIPE LENGTH (FT) (CONTINUED) NUMBER OF 90° ELBOWS TERMINATION PIPE DIA ALTITUDE (FT) UNIT SIZE TYPE (IN.)* 1-1/2 024040 2 Pipe or 2-in 036040 Concentric 024060 1-1/2 2 Pipe or 2-in 036060 Concentric 048060 036080 2 Pipe or 2-in 8001 to 9000‡...
- Page 28 TABLE 7—MAXIMUM ALLOWABLE EXPOSED VENT PIPE LENGTH (FT) WITH AND WITHOUT INSULATION IN WINTER DESIGN TEMPERATURE AMBIENT* WINTER DESIGN MAX PIPE FURNACE WITHOUT WITH 3/8–IN. OR TEMPERATURE DIAMETER SIZE INSULATION THICKER INSULATION† (°F) (IN.) * Pipe length (ft) specified for maximum pipe lengths located in unconditioned spaces. Pipes located in unconditioned space cannot exceed total allowable pipe length as specified in Table 7.
- Page 29 25--24--65--2 AIR SUPPL Y INLET VENT TERMINAL AREA WHERE TERMINAL IS NOT PERMITED Item Clearance Descriptions Canadian Installation (1) U.S. Installation (2) Clearance above grade, veranda, porch, deck, balcony, or 12˝ (30cm) # 12˝ (30 cm) anticipated snow level Clearance to a window or door that may be opened 6˝...
- Page 30 5. Working from furnace to outside, cut pipe to required WARNING: Vent pipe must be installed and fully length(s). seated against inducer housing internal stop. Clamp must 6. Deburr inside and outside of pipe. be tightened to prevent any condensate leakage. Failure to follow this warning could result in electrical shock, fire, 7.
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Page 31: Vent Termination
16. Use appropriate methods to seal openings where vent pipe HOUSING COMBUSTION–AIR PLUG passes through roof or sidewall. INTAKE HOUSING 3/8 ID TUBE BURNER NOTE: Select 1 vent pipe connection and NOTE: Select 1 vent pipe connection and 1 combustion-air pipe connection. 1 combustion-air pipe connection. - Page 32 12 MIN 12 MIN VENT PIPE VENT PIPE HORIZONTAL TO ROOF HORIZONTAL TO SIDEWALL VENT 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.
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Page 33: Application
Furnace condensate is mildly acidic, typically in the pH range of START-UP, ADJUSTMENTS AND SAFETY CHECK 3.2 to 4.5. Due to corrosive nature of unneutralized condensate, a I. GENERAL condensate pH neutralizing filter may be desired. Check with local authorities to determine if a pH neutralizer is required. 1. -
Page 34: Prime Condensate Trap With Water
CAUTION: These furnaces are equipped with a manual reset limit switch in burner box. This switch will open and shut off power to gas valve if an overheat condition (flame rollout) occurs in burner enclosure. Correct inad- equate combustion-air supply or improper venting condi- tion and reset switch. -
Page 35: Cooling Mode
a. Inducer Prepurge Period- As the inducer motor IDM 3. Continuous Blower Mode comes up to speed, the pressure switch contacts PRS When the R-to-G circuit is closed by the thermostat, the close, 24 vac power is supplied for a field installed blower motor BLWM will operate on continuous-blower humidifier at the HUM terminal and the control begins a speed (same as HEAT speed). -
Page 36: Adjustments
1. Remove blower access door. EXAMPLE: (0—2000 altitude) 2. Disconnect the thermostat R lead from furnace control. Heating value = 1050 Btu/cu ft Specific gravity = 0.62 3. Manually close blower door switch. Therefore: Orifice No. 45 Manifold pressure 3.6-in. wc 4. - Page 37 TABLE 9—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) * SPECIFIC GRAVITY OF NATURAL GAS AVG GAS ALTITUDE HEAT VALUE 0.58 0.60 0.62 0.64...
- Page 38 TABLE 9—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) * SPECIFIC GRAVITY OF NATURAL GAS AVG GAS ALTITUDE HEAT VALUE 0.58 0.60 0.62...
- Page 39 TABLE 9—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) * SPECIFIC GRAVITY OF NATURAL GAS AVG GAS ALTITUDE HEAT VALUE 0.58 0.60 0.62...
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Page 40: Set Temperature Rise
CANADA h. Multiply gas rate (cu ft/hr) X heating value (Btu/cu ft) At installation altitudes from 2000 to 4500 ft, this using natural gas heating value from local gas furnace must be derated 5% by an authorized Gas utility/supplier. Conversion Station. To determine correct input rate for altitude, see example above and use 0.95 as derate EXAMPLE: multiplier factor. -
Page 41: Blower Off Delay (Heat Mode)
TABLE 11—GAS RATE (CU FT/HR) TABLE 13—BLOWER OFF DELAY SETUP POSITION SECONDS SIZE OF TEST DIAL SECONDS SIZE OF TEST DIAL PINS 1 AND 2 2 AND 3 3 AND 4 4 AND 5 FOR 1 FOR 1 Time (in sec) REVOLUTION cu ft cu ft... - Page 42 CHECKLIST 3. Turn on 115-v power to furnace. 1. Put away tools and instruments. Clean up debris. 4. Set thermostat to "call for heat" and wait 1 minute. When pressure switch is functioning properly, hot surface igniter 2. Verify manual flame rollout reset switch has continuity. should NOT glow, and status code LED flashes a 31 fault.
- Page 43 CHECKLIST—INSTALLATION LOAD CALCULATION Condensate Drain ____________ Heating Load (Btuh) ________ Unit Level or Pitched Forward ____________ Cooling Load (Btuh) Internal Tubing Connections Free of Kinks ________ and Traps ____________ Furnace Model Selection External Drain Connection Leak Tight and ________ Sloped VENT PIPING ________ Condensate Trap Primed before Start-Up...
- Page 44 © 2003 Bryant Heating & Cooling Systems 7310 W. Morris St. Indianapolis, IN 46231 —44— Printed in U.S.A. 345m408 Catalog No. 5334-520...