420705-UIM-C-0310
EFFICIENCY
RATING
CERTIFIED
ISO 9001
Certified Quality
Management System
MANUFACTURED HOUSING OR MODULAR
HOME GAS FURNACE
MODELS:
MG9S*MP - 33” Models –
Shipped in Downflow Configuration
(95.5% AFUE Single Stage Multi-position)
INSTALLATION MANUAL
LIST OF SECTIONS
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
GAS PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
ELECTRICAL POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
CONDENSATE PIPING AND FURNACE
VENTING CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . 13
COMBUSTION AIR and VENT SYSTEM . . . . . . . . . . . . . . . . . 17
START-UP AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . 23
SAFETY CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
NORMAL OPERATION AND DIAGNOSTICS . . . . . . . . . . . . . 29
REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . 31
REPLACEMENT PART CONTACT INFORMATION . . . . . . . . 31
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
LIST OF FIGURES
Duct Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Attachment to Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Combustible Floor Base Accessory . . . . . . . . . . . . . . . . . . . . . . . 6
Mobile Home Filter Frame Accessories . . . . . . . . . . . . . . . . . . . . 6
Blend Air Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Blend Air Installation (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Vertical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Coil Flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
PC Series Upflow Coil Installation . . . . . . . . . . . . . . . . . . . . . . . . 8
Combustible Floor Base Accessory . . . . . . . . . . . . . . . . . . . . . . . 8
Downflow Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Dimensions (Upflow configuration shown) . . . . . . . . . . . . . . . . . 9
Side Return Cutout Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Upflow/Downflow Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Line Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Single Stage Heat Thermostat Connections . . . . . . . . . . . . . . . 12
Accessory Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Typical. Condensate drain, vertical installation . . . . . . . . . . . . . 13
Typical. Combustion Pipe Drain Tee . . . . . . . . . . . . . . . . . . . . . 14
Upflow Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Downflow Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Home Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Termination Configuration - 2 Pipe . . . . . . . . . . . . . . . . . . . . . . 20
Termination Configuration - 2 Pipe Basement . . . . . . . . . . . . . 20
Double Horizontal Combustion Air Intake
and Vent Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Double Vertical Combustion Air Intake
and Vent Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Direct Vent Air Intake Connection and Vent Connection . . . . . . 21
Outside and Ambient Combustion Air . . . . . . . . . . . . . . . . . . . . 22
Attic and Crawl Space Combustion Air Termination . . . . . . . . . 23
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Reading Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Furnace Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Furnace Control Event Schedule . . . . . . . . . . . . . . . . . . . . . . . 31
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
LIST OF TABLES
Unit Clearances to Combustibles . . . . . . . . . . . . . . . . . . . . . . . . 4
Coil Projection Dimensions - PC Series Coils . . . . . . . . . . . . . . . 8
Cabinet and Duct Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Recommended Filter Sizes (High Velocity 600 FPM) . . . . . . . . . 9
Nominal Manifold Pressure - High Fire . . . . . . . . . . . . . . . . . . . 11
Ratings & Physical / Electrical Data . . . . . . . . . . . . . . . . . . . . . 12
Maximum Equivalent Pipe Length . . . . . . . . . . . . . . . . . . . . . . . 17
Elbow Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Equivalent Length of Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Combustion Air Intake and Vent Connection
Size at Furnace (All Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Estimated Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Unconfined Space Minimum Area in Square Inch . . . . . . . . . . . 21
Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Gas Rate (CU FT/HR) at Full Input . . . . . . . . . . . . . . . . . . . . . . 25
Inlet Gas Pressure Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Nominal Manifold Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Blower Performance CFM - Any Position (Without Filter) . . . . . 28
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 downflow
applications and may be converted for upflow applications.
These furnaces are designed for residential installation in a basement,
closet, alcove, attic, recreation room or garage applications. All units
are factory assembled, wired and tested to assure safe dependable and
economical installation and operation.
These units are Category IV listed and may not be common vented with
another gas appliance as allowed by the National Fuel Gas Code.
