INSTALLATION MANUAL
RESIDENTIAL GAS FURNACE WITH PSC MOTOR
MODELS:
TM8M/TMLM*MP, YM8M/YMLM*MP, CM8M/CMLM*MP, LM8M/LMLM*MP
(80% Modulating Multi-position / Low NOx)
EFFICIENCY
RATING
CERTIFIED
ISO 9001
Certified Quality
Management System
LIST OF SECTIONS
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 GAS PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 ELECTRICAL POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 TWINNING AND STAGING . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 VENT SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
LIST OF FIGURES
Duct Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Vertical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Coil Flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Horizontal Right Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Horizontal Left Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 PC Series Upflow Coil Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Horizontal Left or Right application (Right Shown) . . . . . . . . . . . . . . 8 Combustible Floor Base Accessory . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Horizontal Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Typical Attic Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Typical Suspended Furnace / Crawl Space Installation . . . . . . . . . . . 9 Downflow Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Downflow Installation - Gas Valve Rotation . . . . . . . . . . . . . . . . . . . . 9 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Side Return Cutout Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Upflow/Downflow Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Horizontal Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Thermostat Chart - Single Stage Air Conditioner –
Variable Speed or PSC Modulating Furnace . . . . . . . . . . . . . . . . . . 14 Thermostat Chart - Two Stage Air Conditioner –
Variable Speed or PSC Modulating Furnace . . . . . . . . . . . . . . . . . . 15 Thermostat Chart - Two Stage Air Conditioner with Single Stage Thermostat – Variable Speed or PSC Modulating Furnace . . . . . . . 16 Thermostat Chart - Single Stage Heat Pump –
Variable Speed or PSC Modulating Furnace . . . . . . . . . . . . . . . . . . 17 Thermostat Chart - Single Stage Heat Pump –
Variable Speed or PSC Modulating Furnace . . . . . . . . . . . . . . . . . . 18 Thermostat Chart - Two Stage Heat Pump –
Variable Speed or PSC Modulating Furnace . . . . . . . . . . . . . . . . . . 19 Combustion Air Inducer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Combustion Airflow Path Through The Furnace
Casing to the Burner Compartment . . . . . . . . . . . . . . . . . . . . . . . . . 20 Outside and Ambient Combustion Air . . . . . . . . . . . . . . . . . . . . . . . . 21 Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Furnace Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
LIST OF TABLES
Unit Clearances to Combustibles | . . . . . 4 | Unconfined Space Minimum Area in Square Inch | . . | 19 | |||||||
Coil Projection Dimensions - PC Series Coils | . . . . . 6 | Free Area | 19 | ||||||||
Cabinet and Duct Dimensions | . . . . . 8 | Gas Rate (CU FT/HR) at Full Input | 22 | ||||||||
Recommended Filter Sizes (High Velocity 600 FPM) | . . . . . 8 | Inlet Gas Pressure Range | 23 | ||||||||
High Altitude Orifices | . . . . 10 | Nominal Manifold Pressure | 23 | ||||||||
Ratings & Physical / Electrical Data | . . . . 10 | Cooling Airflow - A/C Capacity in Tons | 24 | ||||||||
Estimated Free Area | . . . . 19 |
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These high efficiency, compact units employ induced combustion, reli- | DANGER indicates an imminently hazardous situation, which, if not | ||||||||||
able hot surface ignition and high heat transfer aluminized tubular heat | avoided, will result in death or serious injury. |
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exchangers. The units are factory shipped for installation in upflow or | WARNING indicates a potentially hazardous situation, which, if | not | |||||||||
horizontal applications and may be converted for downflow applica- | avoided, could result in death or serious injury. |
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tions. |
| CAUTION indicates a potentially hazardous situation, which, | if | not | |||||||
These furnaces are designed for residential installation in a basement, | |||||||||||
avoided may result in minor or moderate injury. It is also used to | |||||||||||
closet, alcove, attic, recreation room or garage and are also ideal for | |||||||||||
alert against unsafe practices and hazards involving only property dam- | |||||||||||
commercial applications. All units are factory assembled, wired and | |||||||||||
age. |
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tested to assure safe dependable and economical installation and oper- |
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ation. |
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These units are Category I listed and may be common vented with |
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another gas appliance as allowed by the National Fuel Gas Code. |
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Improper installation may create a condition where the operation of | |||||||||||
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SECTION I: SAFETY |
| the product could cause personal injury or property damage. |
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| Improper installation, adjustment, alteration, service or mainte- | ||||||||||
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| This is a safety alert symbol. When you see this symbol on | nance can cause injury or property damage. Failure to carefully | ||||||||
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| labels or in manuals, be alert to the potential for | personal | read and follow all instructions in this manual can result in fur- | |||||||
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| injury. |
| nace malfunction, death, personal injury and/or property dam- | |||||||
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| age. Only a qualified contractor, installer or service agency should | ||||||||
Understand and pay particular attention to the signal words DANGER, | |||||||||||
install this product. |
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WARNING, or CAUTION. |
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