INSTALLATION MANUAL
RESIDENTIAL GAS FURNACE MODELS TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP (Single Stage
LIST OF SECTIONS
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 GAS PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 ELECTRICAL POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 TWINNING AND STAGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
VENT SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
LIST OF FIGURES
Duct Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Vertical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Coil Flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Horizontal Right Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Horizontal Left Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 PC Series Upflow Coil Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Horizontal Left or Right application (Right Shown) . . . . . . . . . . . . . . 7 Combustible Floor Base Accessory . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Horizontal Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical Attic Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Typical Suspended Furnace / Crawl Space Installation . . . . . . . . . . . 8 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Side Return Cutout Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Thermostat Chart - Single Stage AC with
Single Stage PSC Furnaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Thermostat Chart - Single Stage HP with
Single Stage PSC Furnaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Typical Twinned Furnace Application . . . . . . . . . . . . . . . . . . . . . . . . 15 Single Wire Twinning Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . 16 Single Wire Staging Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . 16 Combustion Air Inducer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Combustion Airflow Path Through The Furnace
Casing to the Burner Compartment . . . . . . . . . . . . . . . . . . . . . . . . . 17 Outside and Ambient Combustion Air . . . . . . . . . . . . . . . . . . . . . . . . 18 Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Reading Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Furnace Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
LIST OF TABLES
Unit Clearances to Combustibles . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Coil Projection Dimensions - PC Series Coils . . . . . . . . . . . . . . . . . . 7 Cabinet and Duct Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Recommended Filter Sizes (High Velocity 600 FPM) . . . . . . . . . . . . 9 Nominal Manifold Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Ratings & Physical / Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . 12 Estimated Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Unconfined Space Minimum Area . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Gas Rate (CU FT/HR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Inlet Gas Pressure Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Nominal Manifold Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Blower Performance CFM - Any Position
(without filter) - Bottom Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Blower Performance CFM - Any Position
(without filter) - Left Side Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
These high efficiency, compact units employ induced combustion, reli- able hot surface ignition and high heat transfer aluminized tubular heat exchangers. The units are factory shipped for installation in upflow or horizontal applications and may be converted for downflow applica- tions.
These furnaces are designed for residential installation in a basement, closet, alcove, attic, recreation room or garage and are also ideal for commercial applications. All units are factory assembled, wired and tested to assure safe dependable and economical installation and oper- ation.
These units are Category I listed and may be common vented with another gas appliance as allowed by the National Fuel Gas Code.
SECTION I: SAFETY
This is a safety alert symbol. When you see this symbol on labels or in manuals, be alert to the potential for personal
injury.
Understand and pay particular attention to the signal words DANGER, WARNING, or CAUTION.
DANGER indicates an imminently hazardous situation, which, if not avoided, will result in death or serious injury.
WARNING indicates a potentially hazardous situation, which, if not avoided, could result in death or serious injury.
CAUTION indicates a potentially hazardous situation, which, if not avoided may result in minor or moderate injury. It is also used to alert against unsafe practices and hazards involving only property dam- age.
Improper installation may create a condition where the operation of the product could cause personal injury or property damage. Improper installation, adjustment, alteration, service or mainte- nance can cause injury or property damage. Failure to carefully read and follow all instructions in this manual can result in fur- nace malfunction, death, personal injury and/or property dam- age. Only a qualified contractor, installer or service agency should install this product.
