105561-UIM-B-0605
HIGH EFFICIENCY
TUBULAR HEAT EXCHANGER SERIES
MODELS: GY9S / GM9S / GF9S
(Single Stage Upflow)
40 - 135 MBH INPUT
(11.7 - 39.6 KW) INPUT
INSTALLATION MANUAL
EFFICIENCY
RATING
CERTIFIED
ISO 9001
Certified Quality
Management System
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. Refer to this manual
for assistance or for additional information, consult a qualified con-
tractor, installer or service agency.
This product must be installed in strict compliance with the installa-
tion instructions and any applicable local, state, and national codes
including, but not limited to building, electrical, and mechanical
codes.
LIST OF SECTIONS
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
GAS PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
ELECTRICAL POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
TWINNING AND STAGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
COMBUSTION AIR AND VENT SYSTEM . . . . . . . . . . . . . . . . . . . . .11
CONDENSATE PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
SAFETY CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
START-UP AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . .19
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
LIST OF FIGURES
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Furnace Base Rectangular Blockoff Panel . . . . . . . . . . . . . . . . . . . . . 6
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Line Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Single Stage Heat Thermostat Connections . . . . . . . . . . . . . . . . . . . . 9
Accessory Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Typical Twinned Furnace Application . . . . . . . . . . . . . . . . . . . . . . . . 10
Single Stage Twinning Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . 10
Two-Stage Twinning Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . 11
Home Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Termination Configuration - 1 Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Termination Configuration - 2 Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Termination Configuration - 2 Pipe Basement . . . . . . . . . . . . . . . . . .14
Double Horizontal Sealed Combustion Air and Vent Termination . . .15
Double Vertical Sealed Combustion Air and Vent Termination . . . . .15
Sealed Combustion Air Intake Connection and Vent Connection . . .15
Combustion Airflow Path Through The Furnace Casing . . . . . . . . . .15
Outside and Ambient Combustion Air . . . . . . . . . . . . . . . . . . . . . . . . .17
Attic and Crawl Space Combustion Air Termination . . . . . . . . . . . . . .18
Condensate Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Pressure Switch Tube Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Reading Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Typical Heat/Cool Speed Tap Connections . . . . . . . . . . . . . . . . . . . .22
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
LIST OF TABLES
Unit Clearances to Combustibles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Minimum Duct Sizing For Proper Airflow . . . . . . . . . . . . . . . . . . . . . . . 4
Round Duct Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Filter Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
High Altitude Conversion (40-120 MBTUH Models) . . . . . . . . . . . . . . . 7
High Altitude Conversion (135 MBTUH Models) . . . . . . . . . . . . . . . . . 7
Electrical and Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Combustion Air Intake and Vent Connection Size at Furnace
(All Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Combustion Air Supply and Vent Piping . . . . . . . . . . . . . . . . . . . . . . .12
Estimated Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Unconfined Space Minimum Area in Square Inch . . . . . . . . . . . . . . .16
Inlet Gas Pressure Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Nominal Manifold Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Blower Performance CFM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Filter Performance - Pressure Drop Inches W.C. and (kPa) . . . . . . . .23
