268890-UIM-B-0607
HIGH EFFICIENCY
TUBULAR HEAT EXCHANGER SERIES
MODELS: GY9S*DH / GM9S*DH / GF9S*DH
(Single Stage Downflow/Horizontal)
40 - 120 MBH INPUT
(11.72 - 35.17 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
GAS PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
ELECTRICAL POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
TWINNING AND STAGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
COMBUSTION AIR AND VENT SYSTEM . . . . . . . . . . . . . . . . . . . . .14
CONDENSATE PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
SAFETY CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
START-UP AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . .31
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
LIST OF FIGURES
Transition Kit Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Return Filter Grill and Return Duct Installation . . . . . . . . . . . . . . . . . . . 8
Typical Attic Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Typical Suspended Furnace / Crawl Space Installation . . . . . . . . . . . . 9
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Downflow Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Horizontal Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Thermostat Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Accessory Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Typical Twinned Furnace Application . . . . . . . . . . . . . . . . . . . . . . . . 13
Single Stage Twinning Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . 14
Two-Stage Twinning Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . 14
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Home Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Downflow/Horizontal Vent Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 18
Termination Configuration - 1 Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Termination Configuration - 2 Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Termination Configuration - 2 Pipe Horizontal . . . . . . . . . . . . . . . . . . 18
Crawl Space Termination Configuration - 2Pipe . . . . . . . . . . . . . . . . 19
Double Horizontal Sealed Combustion Air and Vent Termination . . . 19
Double Vertical Sealed Combustion Air and Vent Termination . . . . . 19
Sealed Combustion Air Intake Connection and Vent Connection . . .19
Combustion Airflow Path Through The Furnace Casing to the Burner
Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Outside and Ambient Combustion Air . . . . . . . . . . . . . . . . . . . . . . . . .21
Attic Combustion Air Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Condensate Drain Internal Hose Routing . . . . . . . . . . . . . . . . . . . . . .22
Downflow Condensate Drain Hose Configuration . . . . . . . . . . . . . . .23
Horizontal Left Condensate Drain Hose Configuration . . . . . . . . . . . .24
Horizontal Left Condensate Drain Hose Configuration . . . . . . . . . . . .25
Horizontal Right Condensate Drain Hose Configuration
(Option 1 - Front of Casing) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Horizontal Right Condensate Drain Hose Configuration
(Option 1 - Front of Casing) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Horizontal Right Condensate Drain Hose Configuration
(Option 2 - Back of Casing) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Horizontal Right Condensate Drain Hose Configuration
(Option 2 - Back of Casing) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Pressure Switch Tubing Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Reading Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Furnace Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
LIST OF TABLES
Unit Clearances to Combustibles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Minimum Duct Sizing For Proper Airflow . . . . . . . . . . . . . . . . . . . . . . . 5
Round Duct Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Cabinet and Duct Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Recommended Filter Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Nominal Manifold Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical and Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Maximum Equivalent Pipe Length . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Equivalent Length of Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Elbow Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Combustion Air Intake and Vent Connection Size at Furnace
(All Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Estimated Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Free Area - Outdoor Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Unconfined Space Minimum Area in Square Inches . . . . . . . . . . . . .20
Condensate Drain Hose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Inlet Gas Pressure Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Nominal Manifold Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Blower Performance CFM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Filter Performance - Pressure Drop Inches W.C. and (kPa) . . . . . . . .37
