NOTE: Read the entire instruction manual before starting the
installation.
This symbol → indicates a change since the last issue.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS.....................................................1
INTRODUCTION..........................................................................2
Codes and Standards......................................................................4
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS........4
APPLICATIONS............................................................................4
General ......................................................................................4
Upflow Applications.................................................................4
Downflow Applications............................................................6
Horizontal Left (Supply-Air Discharge) Applications ............7
Horizontal Right (Supply-Air Discharge) Applications ..........9
LOCATION..................................................................................11
General ....................................................................................11
Furnace Location Relative to Cooling Equipment ................12
Hazardous locations................................................................12
INSTALLATION.........................................................................12
Leveling Legs (If Desired).....................................................12
Installation in Upflow and Downflow Applications..............13
Installation in Horizontal Applications ..................................14
Air Ducts.................................................................................14
Filter Arrangement..................................................................15
Bottom Closure Panel.............................................................16
Gas Piping...............................................................................17
Electrical Connections ............................................................17
Direct Venting.........................................................................19
Condensate Drain....................................................................28
Sequence of Operation............................................................31
START-UP PROCEDURES........................................................33
General ....................................................................................33
Prime Condensate Trap With Water......................................33
Purge Gas Lines......................................................................34
Adjustments.............................................................................34
Check Safety Controls............................................................38
Checklist..................................................................................39
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
54-1999/ANSI Z223.1-1999 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
A93040
Fig. 1—Multipoise Orientations
A93041
UPFLOW
DOWNFLOW
HORIZONTAL
LEFT
AIRFLOW
AIRFLOW
AIRFLOW
AIRFLOW
HORIZONTAL
RIGHT
REGISTERED QUALITY SYSTEM
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EFFICIENCY
RATING
CERTIFIED
CERTIFIED
Installation, Start-Up,
and Operating Instructions
DELUXE 4–WAY MULTIPOISE
FIXED-CAPACITY DIRECT-VENT
CONDENSING GAS FURNACE
Cancels: II 350M-40-10 II 350M-40-12
10-00
350MAV
Series E &F
—1—
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