NOTE: Read the entire instruction manual before starting the
installation.
This symbol → indicates a change since the last issue.
Index Page
DIMENSIONAL DRAWING........................................................3
SAFETY CONSIDERATIONS..................................................1-2
Clearances to Combustibles......................................................4
CODES AND STANDARDS ....................................................4-5
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS ....5-6
INTRODUCTION..........................................................................6
APPLICATIONS ......................................................................6-12
General ......................................................................................6
Upflow Applications..............................................................6-8
Downflow Applications.........................................................8-9
Horizontal Left (Supply-Air Discharge) Applications ..........10
Horizontal Right (Supply-Air Discharge) Applications...10-12
LOCATION ............................................................................12-14
General...............................................................................12-13
Furnace Location Relative to Cooling Equipment ................13
Hazardous Locations...............................................................14
INSTALLATION.........................................................................14
Leveling Legs (If Desired).....................................................14
Installation In Upflow or Downflow Applications................14
Installation In Horizontal Applications..................................14
AIR DUCTS............................................................................14-19
General Requirements .......................................................14-16
Ductwork Acoustical Treatment .......................................16-17
Supply Air Connections..........................................................17
Return Air Connections..........................................................17
Filter Arrangement..................................................................17
Bottom Closure Panel.............................................................18
Gas Piping..........................................................................18-19
ELECTRICAL CONNECTIONS...........................................19-22
115-v Wiring...........................................................................20
24-v Wiring.............................................................................20
Wiring Diagram ......................................................................21
Accessories ........................................................................20-22
DIRECT VENTING ...............................................................22-34
Removal of Existing Furnaces from
Common Vent Systems.....................................................22
Combustion-Air and Vent Piping .....................................22-30
Concentric Vent and Combustion-Air Termination
Kit Installation..............................................................30-31
Multiventing and Vent Termination .................................31-34
CONDENSATE DRAIN..............................................................34
General ....................................................................................34
Application..............................................................................34
Condensate Drain Protection..................................................34
SEQUENCE OF OPERATION..............................................35-36
Heating Mode...............................................................................35
Cooling Mode...............................................................................35
Continuous Blower Mode............................................................35
Heat Pump Mode....................................................................35-36
Component Test ...........................................................................36
START-UP PROCEDURES ..................................................36-44
General ....................................................................................36
Prime Condensate Trap With Water......................................36
Purge Gas Lines......................................................................36
Adjustments .......................................................................36-44
Set Gas Input Rate ............................................................36-44
Set Temperature Rise..............................................................44
Blower Off Delay (Heat Mode).............................................44
Set Thermostat Heat Anticipator............................................44
CHECK SAFETY CONTROLS ............................................44-45
Check Primary Limit Control.................................................45
Check Pressure Switch ...........................................................45
CHECKLIST ................................................................................45
SAFETY CONSIDERATIONS
CAUTION: Application of this furnace should be in-
doors with special attention given to vent sizing and
material, gas input rate, air temperature rise, unit leveling,
and unit sizing. Improper installation or misapplication of
furnace can require excessive servicing or cause prema-
ture component failure.
A93040
ama
CERTIFIED
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.
REGISTERED QUALITY SYSTEM
installation, start-up,
and operating instructions
4-WAY MULTIPOISE
FIXED-CAPACITY DIRECT-VENT
CONDENSING GAS FURNACE
Cancels: II 340M-40-10 II 340M-40-11
10-03
340MAV
Series J
—1—
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