Unitary products group DGAD Installation Manual

INSTALLATION MANUAL
HIGH EFFICIENCY
TUBULAR HEAT EXCHANGER SERIES
MODELS: DGAD / DGAE / DGAF
(Single-Stage Downflow, 92% AFUE,
Manufactured Housing or Modular Home Applications)
60 - 100 MBH INPUT
(17.6 - 29.3 KW) INPUT
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
GAS PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
ELECTRICAL POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Combustible Floor Base Accessory . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Transition Kit Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Attachment to Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Blend Air Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Mobile Home Filter Frame Accessories . . . . . . . . . . . . . . . . . . . . . . . . 7
Modular Home Return Filter Grill and Return Duct Installation . . . . . . 8
Convertible Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Downflow Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Line Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Single Stage Heat Thermostat Connections . . . . . . . . . . . . . . . . . . . 11
Accessory Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Home Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Downflow Vent Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Unit Clearances to Combustibles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Nominal Manifold Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical and Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Maximum Equivalent Pipe Length . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Equivalent Length of Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Elbow Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Combustion Air Intake and Vent Connection Size at Furnace
(All Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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.
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LIST OF SECTIONS
COMBUSTION AIR AND VENT SYSTEM . . . . . . . . . . . . . . . . . . . . .11
CONDENSATE PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
SAFETY CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
START-UP AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . .20
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
LIST OF FIGURES
Termination Configuration - 1 Pipe (Modular Installations Only) . . . .15
Termination Configuration - 2 Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Double Horizontal Sealed Combustion Air and Vent Termination . . .16
Double Vertical Sealed Combustion Air and Vent Termination . . . . .16
Sealed Combustion Air Intake Connection and Vent Connection . . .16
Combustion Airflow Path Through The Furnace Casing
to the Burner Box (Modular Home Installations Only) . . . . . . . . . . . .17
Outside and Ambient Combustion Air
(Modular Home Installations Only) . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Attic Combustion Air Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Condensate Drain Internal Hose Routing . . . . . . . . . . . . . . . . . . . . . .18
Downflow Condensate Drain Hose Configuration . . . . . . . . . . . . . . .19
Pressure Switch Tubing Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Reading Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Furnace Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
LIST OF TABLES
Estimated Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Free Area - Outdoor Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Unconfined Space Minimum Area in Square Inch . . . . . . . . . . . . . . .17
Condensate Drain Hose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Inlet Gas Pressure Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Nominal Manifold Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Blower Performance CFM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Filter Performance - Pressure Drop Inches W.C. and (kPa) . . . . . . . .26
Field Installed Accessories - Non-Electrical . . . . . . . . . . . . . . . . . . . .27
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.
EFFICIENCY
RATING
CERTIFIED
ISO 9001
Certified Quality
Management System
268882-UIM-A-0407