NOTE: Read the entire instruction manual before starting the
installation.
This symbol → indicates a change since the last issue.
TABLE OF CONTENTS
Safety Considerations.....................................................................2
Introduction ....................................................................................2
Codes and Standards......................................................................5
Safety.........................................................................................5
General Installation...................................................................5
Combustion and Ventilation Air ..............................................5
Duct Systems ............................................................................5
Acoustical Lining and Fibrous Glass Duct..............................5
Gas Piping and Gas Pipe Pressure Testing..............................5
Electrical Connections ..............................................................5
Electrostatic Discharge (ESD) Precautions Procedure..................5
Applications....................................................................................6
General ......................................................................................6
Upflow Applications.................................................................6
Downflow Applications............................................................9
Horizontal Left (Supply-Air Discharge)
Applications ............................................................................10
Horizontal Right (Supply-Air Discharge) Applications ........12
Location........................................................................................13
General ....................................................................................13
Furnace Location Relative to Cooling
Equipment ...............................................................................14
Hazardous Locations...............................................................15
Installation ....................................................................................15
Leveling Legs (If Desired).....................................................15
Installation in Upflow and Downflow
Applications ............................................................................15
Installation in Horizontal Applications ..................................15
Air Ducts.................................................................................16
General Requirements .......................................................16
Ductwork Acoustical Treatment .......................................17
Supply Air Connections ....................................................17
Return Air Connections.....................................................17
Filter Arrangement..................................................................18
Bottom Closure Panel.............................................................19
Gas Piping...............................................................................19
Electrical Connections ............................................................20
115-V Wiring.....................................................................20
24-V Wiring.......................................................................21
Accessories ........................................................................22
Direct Venting.........................................................................22
Removal of Existing Furnaces from Common Vent
Systems ..............................................................................22
Combustion-Air and Vent Piping .....................................25
Concentric Vent and Combustion-Air Termination
Kit Installation...................................................................30
Multiventing and Vent Terminations................................34
Condensate Drain....................................................................34
General...............................................................................34
Application.........................................................................34
Condensation Drain Protection .........................................34
Start-Up Adjustment and Safety Check ......................................34
General ....................................................................................34
Prime Condensate Trap With Water......................................36
Purge Gas Lines......................................................................36
Sequence of Operation............................................................37
Two-Stage Heating With Single-Stage Thermostat
(Adaptive Mode)................................................................37
Two-Stage Heating With Two-Stage Thermostat
(Non-Adaptive Heating Mode) .........................................43
Cooling Mode....................................................................44
Thermidistat Mode ............................................................44
Continuous Blower Mode .................................................45
Heat Pump .........................................................................45
Component Self-Test.........................................................45
Operate Furnace.................................................................46
Furnace Restart..................................................................46
Adjustments .............................................................................46
Set Gas Input Rate ............................................................46
Set Temperature Rise ........................................................48
Adjust Blower Off Delay (Heat Mode)............................48
Set Thermostat Heat Anticipator ......................................49
Check Safety Controls............................................................49
Checklist..................................................................................49
A93040
installation, start-up,
and operating instructions
2-STAGE, DIRECT VENT
CONDENSING GAS FURNACE
Cancels: II 352M-60-6 II 352M-60-7
3-05
352MAV
Series C
—1—
To Next Page
General
