Johnson Controls RL18 - Page 40

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Installation Manual: RL18 Single-Stage Standard ECM Residential Gas Furnaces (Non-condensing Multi-position Standard

Low NOx)

Johnson Controls Ducted Systems

Main Page

Table of Contents3
General5
Certification5
Safety5
Specific Safety Rules and Precautions6
Safety Requirements7
Combustion Air Quality (List of Contaminants)7
Codes and Standards8
For Furnaces Installed in the Commonwealth of Massachusetts Only8
Inspection9
Ductwork10
Ductwork General Information10
Duct Flanges11
Ductwork Installation and Supply Plenum Connection - Upflow/Horizontal11
Floor Base and Ductwork Installation - Downflow11
Coil Installation12
Downflow Duct Connectors13
Residential and Modular Home Upflow Return Plenum Connection13
Side Return Application13
Bottom Return and Attic Installations13
Downflow Application13
Horizontal Application13
Attic Installation13
Suspended Furnace or Crawl Space Installation14
Filters16
Filter Installation16
Side Return16
Gas Piping17
Gas Safety17
Gas Piping Installation17
Gas Orifice Conversion for Propane (LP)18
High Altitude Gas Orifice Conversion18
High Altitude Pressure Switch Conversion19
Electric Power19
Electric Power Connections19
Supply Voltage Connections20
Low Voltage Control Wiring Connections20
Accessory Connections21
Electronic Air Cleaner Connection21
Humidifier Connection21
Twinning and Staging21
Furnace Control Twinning Wiring21
Twinning Duct System22
Vent System22
Vent Connections22
Category 1 - 450°F Maximum Vent Temperature23
Venting23
Venting into an Existing Chimney23
Fan-Assisted Combustion System23
Ambient Combustion Air Supply23
Dampers, Louvers and Grilles (Canada Only)25
Ventilated Combustion Air26
Vent and Supply (Outside) Air Safety Check Procedure26
Start-Up and Adjustments27
Removing Nox Screens (Lo-Nox Models Only)27
Gas Piping Leak Check28
Ignition System Sequence28
Calculating the Furnace Input (Natural Gas)28
Adjusting the Manifold Gas Pressure and Input Rate30
Airflow Settings31
Safety Controls34
Control Circuit Fuse34
Blower Door Safety Switch34
Rollout Switch Controls34
Pressure Switches34
Limit Controls35
Sequence of Operation35
Troubleshooting35
Furnace Control Diagnostics36
Diagnostic Fault Code Storage and Retrieval37
Replacement Parts List38
Replacement Part Contact Information38
Wiring Diagram39
Start-Up Sheet41

Johnson Controls RL18 - Page 40

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