Installation Instructions
TABLE OF CONTENTS
Fig. 1 - Furnace Orientation
FURNACE RELIABILITY HAZARD
Required Notice for Massachusetts Installations
FURNACE RELIABILITY HAZARD
SAFETY CONSIDERATIONS
355CAV
CUT HAZARD
355CAV
Dimensions In. / mm
Fig. 2 - Dimensional Drawing
355CAV
Fig. 3 - Clearances to Combustibles
INSTALLATION
General Installation
Fig. 4 - Return-AirTemperature
Fig. 5 - Installation in a Garage
Safety
UPFLOW APPLICATION
ELECTROSTATIC DISCHARGE ESD PRECAUTIONS
INTRODUCTION
APPLICATIONS
355CAV
Fig. 6 - Condensate Trap
Condensate Trap Alternate Upflow Orientation
CARBON MONOXIDE POISONING HAZARD
Fig. 8 - Alternate Trap Location
Pressure Switch Tubing
Upper Inducer Housing Drain Connection
Condensate Trap Field Drain Attachment
Condensate Trap Tubing
DOWNFLOW APPLICATIONS
Fig. 9 - Condensate Trap
Condensate Trap Location
355CAV
Fig. 11 - Horizontal Left Tube Configuration
HORIZONTAL LEFT SUPPLY-AIRDISCHARGE APPLICATIONS
Pressure Switch Tubing
355CAV
Vent 2-PipeApplication
PROPERTY DAMAGE
Pressure Switch Tubing
UNIT OPERATION HAZARD
Fig. 14 - Horizontal Right Tube Configuration
HORIZONTAL RIGHT SUPPLY-AIRDISCHARGE APPLICATIONS
Construct a Working Platform
355CAV
LOCATION
Condenste Trap Field Drain Attachment
Pressure Switch Tubing
Furnace Location Relative to Cooling Equipment
Fig. 16 - Prohibit Installation on Back
FIRE OR DEATH HAZARD
Fig. 17 - Freeze Protection
Hazardous Locations
INSTALLATION
Installation in Upflow or Downflow Applications
Installation in Horizontal Applications
355CAV
Fig. 22 - Duct Flanges
Combustible Floor
Installed on a Combustible Floor
355CAV
Supply Air Connections Upflow Furnaces
AIR DUCTS
General Requirements
Ductwork Acoustical Treatment
Downflow and Horizontal Furnaces
Return Air Connections
FIRE HAZARD
Upflow Furnaces
FIRE OR EXPLOSION HAZARD
Fig. 24 - Filter Installed for Side Inlet
Bottom Closure Panel
Gas Piping
355CAV
Fig. 26 - Removing Bottom Closure Panel
Fig. 27 - Typical Gas Pipe Arrangement
Fig. 28 - Casing Pipe Grommets
355CAV
115-vWiring
Table 3 - Maximum Capacity of Pipe
ELECTRICAL SHOCK HAZARD
355CAV
Fig. 30 - Disconnect Switch and Furnace
Table 4 - Electrical Data
ELECTRICAL SHOCK AND FIRE HAZARD
Accessories
Factory Installed J-BoxLocation
24-vwiring
Fig. 31 - Factory Installed J-BoxLocation
Ventilated Combustion Air Option Materials
AIR FOR COMBUSTION AND VENTILATION
Combustion-Airand Vent Pipe Systems
Direct Vent / 2-PipeSystem
FITTINGS
ASTM
MATERIAL
PIPE
355CAV
Fig. 33 - Furnace Control
A06675
Fig. 34 - Direct Vent Termination Clearance
355CAV
A05013
355CAV
A05091
355CAV
A05090
UNIT CORROSION HAZARD
Location and Elbow Configuration
COMBUSTION AIR PIPE
Fig. 38 - Combustion Air and Vent Pipe Transition
CARBON MONOXIDE POISONING HAZARD
Fig. 40 - Intake Housing Plug Fitting Drain
355CAV
UNIT CORROSION HAZARD
355CAV
VENT PIPE
CARBON MONOXIDE POISONING AND
Attachment of Vent Pipe
Fig. 42 - Crawlspace Termination
304.8mm minimum
76.2 mm minimum 304.8 mm minimum
Fig. 41 - Attic Termination
3” 76.2mm minimum
Fig. 43 - Crawlspace Termination
304.8mm minimum
355CAV
General
VENT TERMINATION
Extended Exposed Sidewall Pipes
355CAV
355CAV
5.Check required dimensions as shown
355CAV
Winter Design Temperature Ambient
355CAV
Table 7 - Maximum Allowable Pipe Length Ft / M
UNIT SIZE
DIAMETER OF COMBUSTION AIR
CONDENSATE DRAIN
DIRECT VENT 2 PIPE TERMINATION
TERMINATION SYSTEM
Continuous Fan CF Setup Switches
START-UP,ADJUSTMENT AND SAFETY CHECK
Step 2 - Select Setup Switch Positions
Air Conditioning A/C Setup Switches
UNIT OPERATION HAZARD
Fig. 48 - Example of Setup Switch in Off Position
Prime Condensate Trap with Water
355CAV
A06677
Fig. 49 - Wiring Diagram
355CAV
355CAV
Fig. 50 - Inducer Housing Drain Tube
Table 9 - Furnace Setup Switch Description
Fig. 51 - Filling Condensate Trap
Adaptive Mode
Step 3 - Sequence of Operation
Purge Gas Lines
Single-StageThermostat and Step-ModulatingHeating
355CAV
Two-StageThermostat and Two-StageMedium/High
Heating
355CAV
Cooling Mode
Thermidistat Mode
Heat Pump
Super Dehumidify Mode
Continuous Blower Mode
Continuous Blower Speed Selection from Thermostat
355CAV
Conditioning
Conditioner
Pump Dual Fuel
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Pump
Furnace and Two-SpeedAir Conditioner
Furnace and Two-SpeedHeat Pump
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Step 4 - Adjustments
Set Gas Input Rate
Fig. 60 - Redundant Automatic Gas Valve
UNIT DAMAGE HAZARD
Fig. 61 - Burner Orifice
355CAV
355CAV
Derated 2% / 1000 Ft. Above Sea Level
Derated 2% / 1000 Ft. Above Sea Level
355CAV
UNIT DAMAGE HAZARD
Table 11 - Altitude Derate Multiplier for U.S.A
Fig. 62 - Burner Flame
355CAV
355CAV
Set Temperature Rise
Table 12 - Gas Rate cu Ft/Hr
Set Thermostat Heat Anticipator
Check Primary Limit Control
CHECKLIST
Check Safety Controls
Check Pressure Switches
355CAV
CHECKLIST - INSTALLATION
Safety Controls Check Operation
CHECKLIST --- START---UP