Table of Contents
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NOTE: Read the entire instruction manual before starting the
Index
DIMENSIONAL DRAWING........................................................2
SAFETY CONSIDERATIONS..................................................1-3
Clearances to Combustibles......................................................3
INTRODUCTION.......................................................................4-5
APPLICATIONS ........................................................................4-7
General ......................................................................................5
Condensate Trap Installation.................................................5-7
LOCATION ................................................................................8-9
General...................................................................................8-9
Furnace Location Relative to Cooling Equipment ..................9
Hazardous Locations.................................................................9
INSTALLATION......................................................................9-12
Installation In Downflow Application ................................9-10
Filter Arrangement..................................................................11
Gas Piping..........................................................................11-12
ELECTRICAL CONNECTIONS...........................................12-13
115-v Wiring...........................................................................13
24-v Wiring.............................................................................13
Accessories..............................................................................13
Wiring Diagram ......................................................................14
DIRECT VENTING ...............................................................13-21
Common Vent Systems................................................13-15
Combustion-Air and Vent Piping .....................................15-19
Kit Installation..............................................................19-21
CONDENSATE DRAIN..............................................................21
General ....................................................................................21
Application ..............................................................................21
Condensate Drain Protection ..................................................21
SEQUENCE OF OPERATION..............................................21-23
Heating Mode ....................................................................21-22
Cooling Mode .........................................................................22
Continuous Blower Mode.......................................................22
Heat Pump Mode ....................................................................22
Component Test.................................................................22-23
installation, start-up,
and operating instructions
DOWNFLOW MANUFACTURED (MOBILE)
AND MODULAR HOME DIRECT-VENT
CONDENSING GAS FURNACE
A93040
Page
-1-
Cancels: New
®
SM
As an ENERGY STAR
Partner, Bryant Heating &
Cooling Systems Com-
pany has determined that
this product meets the EN-
ERGY STAR guidelines
REGISTERED QUALITY SYSTEM
for energy efficiency.
START-UP PROCEDURES ..................................................23-27
General ....................................................................................23
Prime Condensate Trap With Water ......................................23
Purge Gas Lines......................................................................23
Adjustments .......................................................................27-32
Set Gas Input Rate ............................................................27-32
Set Temperature Rise..............................................................32
Blower Off Delay (Heat Mode) .............................................32
Set Thermostat Heat Anticipator............................................32
CHECK SAFETY CONTROLS ............................................32-33
Check Primary Limit Control.................................................32
Check Pressure Switch ...........................................................33
CHECKLIST ................................................................................33
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 per-
formed by trained service personnel. When working on heating
equipment, observe precautions in literature, on tags, and on labels
attached to or shipped with unit and other safety precautions that
may apply.
Follow all safety codes. In the United States, follow all safety
codes including the National Fuel Gas Code (NFGC) NFPA No.
54-1996/ANSI Z223.1-1996 and the Installation Standards, Warm
Air Heating and Air Conditioning Systems (NFPA 90B)
ANSI/NFPA 90B. In Canada, refer to the current edition of the
National Standard of Canada CAN/CGA-B149.1- and .2-M95
Natural Gas and Propane Installation Codes (NSCNGPIC). Wear
safety glasses and work gloves. Have fire extinguisher available
during start-up and adjustment procedures and service calls.
Recognize safety information. This is the safety-alert symbol
When you see this symbol on unit or in instructions and manuals,
be alert to potential for personal injury.
Understand the signal words DANGER, WARNING, and CAU-
TION. These words are used with the safety-alert symbol. DAN-
GER identifies most serious hazards which will result in severe
351DAS
Series A
II 351D-80-1
2-99
ama
A PP R O VED
R
.
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Summary of Contents for Bryant 351DAS
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Page 1: Table Of Contents
2-99 ® A PP R O VED As an ENERGY STAR A93040 Partner, Bryant Heating & Cooling Systems Com- pany has determined that this product meets the EN- NOTE: Read the entire instruction manual before starting the ERGY STAR guidelines REGISTERED QUALITY SYSTEM for energy efficiency. -
Page 2: Dimensional Drawing
—2—... -
Page 3: Clearances To Combustibles
INSTALLATION This forced air furnace is equipped for use with natural or propane gas at altitudes 0 - 10,000 ft (0 - 3,050m). This furnace is for indoor installation in a manufactured (mobile) or modular home. This furnace may be installed on combustible flooring in alcove or closet at minimum clearance from combustible material. This appliance requires a special venting system. -
Page 4: Introduction
Gas Association, 55 Scarsdale Road, Don Mills, Ontario, Canada INTRODUCTION M3B 2R3. The model 351DAS, Series A Furnaces are available in 3 heating Installations must comply with applicable regulations of serving and cooling airflow sizes. gas supplier and local building, heating, plumbing, or other codes The 351DAS Condensing Gas-Fired Furnace is A.G.A./C.G.A. -
Page 5: Applications
b. Alternate method: Attach right angle mounting brackets WARNING: The conversion from natural gas to pro- or pipe strap (bent 90 degrees) to coil casing using No. pane gas or propane gas to natural gas shall be installed 10 self tapping screws. Attach other end of by a qualified service agency in accordance with the brackets/strap to floor of structure using 5/16-in. - Page 6 WALL STUDS RETURN AIR PLENUM (WHEN USED) SECURE FURNACE TO STRUCTURE PIPE STRAP REMOVE SLACK (TYPICAL BOTH SIDES) ATTACH ADHESIVE 1 /8-IN. THICK ANGLE MOUNTING POUCH TO BRACKET (TYPICAL BOTH SIDES) DOOR OR SIDE FASTEN FURNACE TO CASING SCREWS THROUGH CASING FLANGES FURNACE PIPE STRAP FASTENED TO FURNACE AND COIL CASING SIDES...
- Page 7 PLUG OR CAP COLLECTOR BOX PLUG OR CAP LOWER PRESSURE TUBE UPPER COLLECTOR BOX PRESSURE TUBE COLLECTOR BOX UPPER PRESSURE LOWER TUBE COLLECTOR BOX COLLECTOR BOX PRESSURE TUBE DRAIN TUBE COLLECTOR BOX DRAIN TUBE INDUCER HOUSING DRAIN TUBE CONDENSATE CONDENSATE TRAP TRAP COLLECTOR BOX...
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Page 8: Location
FURNACE LEVEL (0″) FRONT ″ MAX ⁄ FIELD-SUPPLIED SUPPORTS A99019 (1 X 4 OR 2 X 4 3 PLACES) NOTE: For proper furnace operation, install furnace so that it is level or pitched forward within 1/2 in. to ensure proper condensate drainage from secondary heat exchangers. -
Page 9: Furnace Location Relative To Cooling Equipment
Provide ample space for servicing and cleaning. Always comply with minimum fire protection clearances shown on unit’s clear- ance to combustibles label. (See Fig. 2.) Locate furnace where FRONT available electric power and gas supplies meet specifications on furnace rating plate. II. - Page 10 PLENUM OPENING FLOOR OPENING A96283 Fig. 8—Floor and Plenum Opening Dimensions FURNACE FURNACE (OR COIL CASING WHEN USED) CD5 OR CK5 COIL ASSEMBLY OR KCAKC COIL BOX COMBUSTIBLE COMBUSTIBLE FLOORING FLOORING DOWNFLOW SUBBASE SHEET METAL PLENUM SHEET METAL PLENUM FLOOR FLOOR OPENING OPENING...
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Page 11: Filter Arrangement
FILTER SUPPORT PERFORATED FILTER DISCHARGE DUCT RETAINER FLANGE WASHABLE FILTER 210° A93029 Fig. 11—Duct Flanges WARNING: Do not bend duct flanges inward as shown. This will affect airflow across heat exchangers and may cause limit cycling or premature heat exchanger failure. Remove duct flange completely or bend it inward a minimum of 210°... -
Page 12: Electrical Connections
ELECTRICAL CONNECTIONS WARNING: Never purge a gas line into a combustion See Fig. 14 for field wiring diagram showing typical field 115-v chamber. Never use matches, candles, flame, or other and 24-v wiring. Check all factory and field electrical connections sources of ignition for purpose of checking leakage. -
Page 13: 24-V Wiring
1. Remove 2 screws holding auxiliary J-box. (See Fig. 15.) DIRECT VENTING 2. Rotate J-box 180° and attach box to left side, using holes The 351DAS Furnace requires a dedicated direct-vent system. In a provided. direct-vent system, all air for combustion is taken directly from... -
Page 14: Wiring Diagram
—14—... -
Page 15: Combustion-Air And Vent Piping
TABLE 5—ELECTRICAL DATA OPERATING VOLTS— MAX WIRE MAX FUSE UNIT UNIT VOLTAGE RANGE HERTZ— UNIT WIRE LENGTH OR CKT BKR SIZE AMPACITY† PHASE AMPS SIZE (FT)‡ AMPS** Max* Min* 036080 115—60—1 10.4 048080 115—60—1 10.0 13.4 060080 115—60—1 14.1 18.4 * Permissible limits of voltage range at which unit will operate satisfactorily. - Page 16 NOTE: Furnace combustion-air and vent pipe connections are NOTE: Select 1 vent pipe connection and 1 combustion-air pipe connection. sized for 2-in. pipe. Any pipe size change should be made outside furnace casing in vertical pipe. (See Fig. 18.) This allows proper drainage of vent condensate.
- Page 17 TABLE 7—MAXIMUM ALLOWABLE PIPE LENGTH (FT) NUMBER OF 90° ELBOWS TERMINATION PIPE DIA ALTITUDE UNIT SIZE TYPE (IN.)* 1-1/2 036080 048080 2 Pipe or 2-In. 0 to 2000 060080 Concentric 2-1/2 036080 048080 2 Pipe or 2-In. 2001 to 3000 060080 Concentric 2-1/2...
- Page 18 2. When installing vent systems of short pipe length, use the smallest allowable pipe diameter. Do not use pipe size greater than required or incomplete combustion, flame disturbance, or flame sense lockout may occur. NOTE: Do not count elbows or pipe sections in terminations or within furnace.
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Page 19: Concentric Vent And Combustion-Air Termination Kit Installation
4. Deburr inside and outside of pipe. 3. Determine required insulation thickness for exposed pipe lengths. 5. Chamfer outside edge of pipe for better distribution of NOTE: Pipe length (ft) specified for maximum pipe lengths primer and cement. located in unconditioned spaces cannot exceed total allowable pipe 6. - Page 20 ROOF 18″ MAXIMUM BRACKET COUPLING COMBUSTION VERTICAL SEPARATION VENT BETWEEN COMBUSTION AIR AND VENT 8 3 / 4 ″ FOR 3″ KIT 6 3 / 4 ″ FOR 2″ KIT MAINTAIN 12 IN. MINIMUM CLEARANCE ABOVE HIGHEST ANTICIPATED SNOW LEVEL. MAXIMUM OF 24 IN.
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Page 21: Condensate Drain
TABLE 8—MAXIMUM ALLOWABLE EXPOSED VENT PIPE LENGTH (FT) WITH AND WITHOUT INSULATION IN WINTER DESIGN TEMPERATURE AMBIENT* WINTER DESIGN MAX PIPE UNIT WITHOUT WITH 3/8-IN. OR TEMPERATURE DIAMETER SIZE INSULATION THICKER INSULATION† (°F) (IN.) 2-1/2 2-1/2 2-1/2 * 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 22: Cooling Mode
If a call for heat (R-W) occurs while thermostat is in continuous blower mode, blower stops to allow furnace heat exchangers to CONDENSATE TRAP heat up more quickly, then restarts at end of blower on delay period of 60 sec. Blower reverts to continuous operation after heating cycle is completed. -
Page 23: Start-Up Procedures
B. Initiating Component Test By Removing Main Limit NOTE: Proper polarity must be maintained for 115-v wiring. If Switch Wire polarity is incorrect, control center LED status indicator light will flash rapidly and furnace will not operate. NOTE: NO thermostat signal may be present at control center and all blower time delay off periods must be completed. - Page 24 TABLE 9—MODEL 351DAS ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT FOR USE WITH 080 SIZE FURNACES USING NATURAL GAS (TABULATED DATA BASED ON 20,000 BTUH PER BURNER, DERATED 2 PERCENT FOR EACH 1000 FT ABOVE SEA LEVEL) SPECIFIC GRAVITY OF NATURAL GAS...
- Page 25 TABLE 9—MODEL 351DAS ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT Continued FOR USE WITH 080 SIZE FURNACES USING NATURAL GAS (TABULATED DATA BASED ON 20,000 BTUH PER BURNER, DERATED 2 PERCENT FOR EACH 1000 FT ABOVE SEA LEVEL) SPECIFIC GRAVITY OF NATURAL GAS...
- Page 26 TABLE 9—MODEL 351DAS ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT Continued FOR USE WITH 080 SIZE FURNACES USING NATURAL GAS (TABULATED DATA BASED ON 20,000 BTUH PER BURNER, DERATED 2 PERCENT FOR EACH 1000 FT ABOVE SEA LEVEL) SPECIFIC GRAVITY OF NATURAL GAS...
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Page 27: Adjustments
IV. ADJUSTMENTS WARNING: The conversion from natural gas to pro- pane gas or propane gas to natural gas shall be installed by a qualified service agency in accordance with the manufacturer’s instructions and all applicable codes and requirements of the authority having jurisdiction. If the information in these instructions is not followed exactly, a fire, explosion, or production of carbon monoxide may result causing property damage, personal injury, or loss of... - Page 28 LP/NAT CONVERTIBLE EXAMPLE: (0—2000 ft altitude using Table 9) Heating value = 1050 Btu/cu ft Specific gravity = 0.62 Therefore: Orifice No. 45 Manifold pressure 3.6-in. wc * Furnace is shipped with No. 45 orifices. In this example all main burner orifices are the correct size and do not need ON/OFF to be changed to obtain the proper input rate.
- Page 29 13 32" CAUTION: DO NOT bottom out gas valve regulator 11 32" MANIFOLD BURNER ORIFICE adjusting screw. This can result in unregulated manifold pressure and result in excess overfire and heat exchanger failures. CELL PANEL BURNER BOX d. Replace gas valve LP/NAT cap. The NAT arrow point IGNITOR should be toward valve.
- Page 30 TABLE 11—GAS RATE (CU FT/HR) EXAMPLE: (0—2000 ft altitude) SECONDS SIZE OF TEST DIAL SECONDS SIZE OF TEST DIAL Furnace input from rating plate is 80,000 Btuh. FOR 1 FOR 1 REVOLUTION cu ft cu ft cu ft REVOLUTION cu ft cu ft cu ft Btu heating input = Btu/cu ft X cu ft/hr...
- Page 31 MANUFACTURED (MOBILE) OR MODULAR HOME RATING PLATE This appliance is for Manufactured (Mobile) or Modular home applications only. Refer to installation instructions for gas conversion procedures. Use parts supplied by manufacturer and installed by qualified personnel. See main rating plate for appliance model number and input rating.
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Page 32: Set Temperature Rise
l. Turn off furnace power supply. C. Set Temperature Rise 5. Adjust manifold pressure to obtain input rate. CAUTION: Temperature rise must be within limits specified on unit rating plate. Recommended operation is NOTE: Manifold pressure must always be measured with burner at midpoint of rise or above. -
Page 33: Check Pressure Switch
3. Turn on 115-v power to furnace. THERMOSTAT SUBBASE TERMINALS WITH 4. Set thermostat to call for heat and wait 1 minute. When THERMOSTAT REMOVED (ANITICIPATOR, CLOCK, ETC., pressure switch is functioning properly, hot surface ignitor MUST BE OUT OF CIRCUIT.) should NOT glow, and control center diagnostic light HOOK-AROUND flashes a Status Code 31. - Page 34 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 COMBUSTION AND VENT PIPING ________ Tight and Sloped Termination Location...
- Page 35 —35—...
- Page 36 Course descriptions and schedules are in our catalog. CALL FOR FREE CATALOG 1-800-962-9212 [ ] Packaged Service Training [ ] Classroom Service Training A94328 © 1999 Bryant Heating & Cooling Systems 7310 W. Morris St. Indianapolis, IN 46231 —36— Printed in U.S.A. 351d801 Catalog No. 5335-100...
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