Indirect Gas-Fired Heat Modules 3
Table of Contents
General Safety Information .................... 1
Receiving, Unpacking, Storage ................. 2
Unit Identification ............................ 2
Furnace Model Number ....................... 2
Burner Control Turndown ..................... 2
Furnace Serial Number ....................... 2
ETL Listing ................................. 2
Product Overview ............................ 2
Furnace Control Center
Furnace Control Center Components .......... 4
Typical Furnace Control Logic ................ 4
Typical Furnace, Electrical and
Control Components. . . . . . . . . . . . . . . . . . . . . . . 5
Gas-Fired Burner Turndown ................. 6
Electronic Modulation ....................... 6
Two Stage Valve ............................ 6
Combinations .............................. 6
Available Turndown Control Options .......... 6
Installation of Venting for Outdoor Units ...... 7
Installation of Venting for Indoor Units ........ 7
Venting Methods ........................... 8
Installation of Standard Indoor Venting
Horizontal ................................. 8
Vertical ................................... 8
Installation of Concentric Venting
Horizontal ...............................9-10
Vertical ................................10-11
Two-Pipe Venting - Horizontal .............11-12
Two-Pipe Venting - Vertical .................. 12
Installation of Control Wiring ............... 13
Installation of Discharge Air Sensor ......... 13
Installation of Gas Piping .................13-14
Gas Supply Requirements. . . . . . . . . . . . . . . . . . . 14
Connect the Supply Gas Line ................ 14
Installation Addition Regulator ............... 14
Testing the System for Leaks ................ 14
Gas Pressure Test Ports .................... 14
Sequence of Operation ..................... 15
Start-Up / Standby ........................ 15
Heat Mode ............................... 15
Recovery from Lockout ..................... 15
Performance Data ......................... 15
Gas Valves ................................ 16
Start-Up - Furnaces (all units) ............... 17
4:1 Turndown Electronic Modulation .......... 17
Adjust High Fire and Low Fire Settings ....... 18
Modulating Valve High Fire Setting .......... 18
Modulating Valve Low Fire Setting .......... 18
2:1 Turndown Electronic Modulation .......... 19
8 Stage Combustion ....................... 20
Single Stage .............................. 20
2 Stage Combustion ....................... 21
Combination Turndown Configurations ........ 21
Troubleshooting
Ignition Controller ......................... 22
4:1 Electronic Modulation .................23-24
2:1 Electronic Modulation ................... 25
8 Stage ................................26-27
Single and Two Stage ...................... 28
Reference: FX Controller ................... 29
Stand-alone Furnace Control ................ 29
Program Mode .......................... 29
Inlet Air Sensor (optional) .................. 29
Discharge Air Temperature ................. 29
Outside Air Temperature ................... 30
Go to High Fire Mode ..................... 30
Return to Normal Operation ................ 30
Access to Set Points Menu ................ 30
Access the Discharge Air Temperature ....... 30
Access the Inlet Air Sensor (optional) ........ 30
Access the Room Override Setting .......... 30
Furnace Control with Microprocessor .......30-31
Maintenance
Combustion Blower Motor .................. 31
Burners and Orifices ....................... 31
Heat Exchanger ........................... 31
Flue Collector Box ......................... 31
Electrical Wiring ........................... 31
Gas Train ................................ 31
Replacement Parts ........................ 31
Maintenance Log ....................Backcover
Our Commitment ....................Backcover
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