NOTE: Read the entire instruction manual before starting the
installation.
NOTE: This furnace can be installed as a
direct vent (2-pipe)
or non-direct vent (1-pipe) condensing gas furnace.
This symbol → indicates a change since the last issue.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS.....................................................2
CODES AND STANDARDS........................................................4
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS........6
INTRODUCTION..........................................................................6
APPLICATIONS............................................................................6
General ......................................................................................6
Upflow Applications.................................................................6
Downflow Applications............................................................8
Horizontal Left (Supply-Air Discharge)
Applications ............................................................................10
Horizontal Right (Supply-Air Discharge)
Applications ............................................................................11
LOCATION..................................................................................14
General ....................................................................................14
Furnace Location Relative to Cooling Equipment ................15
Hazardous Locations...............................................................16
Furnace Location and Application.........................................16
AIR FOR COMBUSTION AND VENTILATION ....................16
INSTALLATION.........................................................................18
Leveling Legs (If Desired).....................................................18
Installation in Upflow and Downflow
Applications ............................................................................19
Installation in Horizontal Applications ..................................21
Air Ducts.................................................................................21
General Requirements .......................................................21
Ductwork Acoustical Treatment .......................................21
Supply Air Connections ....................................................21
Return Air Connections.....................................................21
Filter Arrangement..................................................................22
Bottom Closure Panel.............................................................23
Gas Piping...............................................................................23
Electrical Connections............................................................24
115–v Wiring.....................................................................26
24–v Wiring.......................................................................26
Accessories ........................................................................27
Removal of Existing Furnaces from Common
Vent Systems ..........................................................................27
Combustion Air and Vent Pipe Systems ...............................27
Condensate Drain....................................................................41
General...............................................................................41
Application.........................................................................41
Condensation Drain Protection .........................................42
START-UP, ADJUSTMENTS AND SAFETY CHECK...........42
General ....................................................................................42
Prime Condensate Trap With Water......................................42
Purge Gas Lines......................................................................42
Sequence of Operation............................................................43
Heating Mode....................................................................43
Cooling Mode....................................................................47
Thermidistat Mode ............................................................47
Continuous Blower Mode .................................................47
Heat Pump Mode...............................................................48
Component Test.................................................................48
Adjustments .............................................................................48
Set Gas Input Rate ............................................................48
Set Temperature Rise ........................................................50
Adjust Blower Off Delay (Heat Mode)............................55
Set Thermostat Heat Anticipator ......................................55
Check Safety Controls............................................................55
Check Primary Limit Control ...........................................55
Check Pressure Switch......................................................56
Checklist..................................................................................56
A93040
installation, start-up,
and operating instructions
DELUXE 4-WAY MULITPOISE
FIXED-CAPACITY
CONDENSING GAS FURNACE
Cancels: II 350M-40-19 II 350A-40-1
8-05
350AAV
Series A
—1—
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