95.5% AFUE SINGLE STAGE
GAS-FIRED MANUFACTURED HOUSING
MULTI-POSITION GAS FURNACES
MODELS: MG9S
NATURAL GAS
60 - 120 MBH INPUT
Due to continuous product improvement,
specifications are subject to change without notice.
Additional efficiency rating information can
be found at www.gamanet.org.
TECHNICAL
GUIDE
TECHNICAL
GUIDE
426499-BTG-C-0912
DESCRIPTION
These compact units employ induced combustion, reliable hot
surface ignition and high heat transfer aluminized tubular heat
exchangers. The units are factory shipped for installation in
upflow applications and may be converted for downflow applications.
These furnaces are designed for residential mobile home, manufactured, or modular home installation. All units are factory
assembled, wired and tested to assure safe dependable and
economical installation and operation.
These units are Category IV direct vent, sealed combustion
listed and may be vented either through side wall or roof applications using approved plastic combustion air and vent piping.
WARRANTY
15-year limited warranty on the heat exchanger.
2-year limited parts warranty.
FEATURES
• Easily applied in upflow or downflow installation with minimal
conversion necessary.
• Compact, easy to install, ideal height 33" tall cabinet.
• Blower-off delay for cooling SEER improvement.
• Easy access to controls to connect power/control wiring.
• Built-in, high level self diagnostics with fault code displays
standard on integrated control module for reliable operation.
• Low unit amp requirement for easy replacement application.
• All models are convertable to use propane (LP) gas.
• Electronic Hot Surface Ignition saves fuel cost with increased
dependability and reliability.
• 100% shut off main gas valve for extra safety.
• 4 speed, direct drive PSC motor.
• 24V, 40 VA control transformer and blower relay supplied for
add-on cooling.
MG9S060B12MP116057120095.530-601601/34.811 x 81510.014
MG9S080B12MP118076120095.535-651651/34.811 x 81510.014
MG9S080C16MP118076160095.535-651551/27.511 x 101511.514
MG9S100C16MP11 10095160095.535-651651/27.511 x 101511.514
Input Output
MBHMBHCFM°F°FHP Amps
MG9S100C20MP11 10095200095.535-65155114.511 x 112017.012
Nominal
Airflow
MG9S120D20MP11 120114200095.535-65160114.511 x 112017.012
Annual Fuel Utilization Efficiency (AFUE) numbers are determined in accordance with DOE Test procedures.
Wire size and over current protection must comply with the National Electrical Code (NFPA-70-latest edition) and all local codes.
The furnace shall be installed so that the electrical components are protected from water.
AFUE
Air Temp.
Rise
Max. Outlet
Air Temp
Blower
Blower
Over-Current
Size
Max
Protect
Total Unit
Amps
Min. wire Size
(awg) @ 75 ft
one way
2Johnson Controls Unitary Products
426499-BTG-C-0912
FILTER PERFORMANCE
The airflow capacity data published in the “Blower Performance” table listed below represents blower performance
WITHOUT filters.
All applications of these furnaces require the use of field
installed air filters. All filter media and mounting hardware or
provisions must be field installed external to the furnace cabinet. DO NOT attempt to install any filters inside the furnace.
NOTE: Single side return above 1800 CFM is approved as long
as the filter velocity does not exceed filter manufacturer ’s recommendation and a transition is used to allow use on a 20x25
filter (upflow only).
Recommended Filter Sizes (High velocity 600 FPM)
CFM
1200B16 x 2516 x 25
1600C16 x 2520 x 25
2000C(2) 16 x 2520 x 25
2000D(2) 16 x 2522 x 25
NOTES:
1.Air velocity through throwaway type filters may not exceed 300 feet per minute (91.4 m/min). All velocities over this requ ire the use of h igh vel oci ty f ilters.
2.Do not exceed 1800 CFM using a single side return and a 16x25 filter. For
CFM greater than 1800, you may use two side returns or one side and the
bottom or one return with a transition to allow use of a 20x25 filter.
Cabinet
Size
Side
(in)
Bottom
(in)
Unit Clearances to Combustibles
ApplicationUpflowDownflow
Top 1" 0"
Vent0" 0"
Rear0" 0"
Side0" 0"
Front*0" 0"
FloorCombustible
ClosetYesYes
Line ContactNoNo
1.For combustible floors only when used with special sub-base.
* - 24" clearance in front and 18" on side recommended for service access.
All furnaces approved for alcove and attic installation.
Combustible
1
ACCESSORIES
PROPANE (LP) CONVERSION KIT - Kit not required as ori-
fices and gas valve spring are included with unit.
CONCENTRIC VENT TERMINATION - For use through roof-
top, sidewall. Allows combustion air to enter and exhaust to exit
through single common hole. Eliminates unslightly elbows for a
cleaner installation.
S1-1CT0302 (2")
S1-1CT0303 (3")
SIDEWALL VENT TERMINATION KIT - For use on sidewall,
two-pipe installations only. Provide a more attractive termination
for locations where the terminal is visable on the side of the
home.
S1-1HT0901 (3")
S1-1HT0902 (2")
CONDENSATE NEUTRALIZER KIT - Neutralizer cartridge has
a 1/2" plastic tube fittings for installation in the drain line. Calcium carbonate refill media is also available from the Source 1
Parts (p/n 026-30228-000).
S1-1NK0301
SIDE RETURN FILTER RACKS (Upflow Only) -
S1-1SR0200 - All Models
S1-1SR0402 - All Models
S1-1SF0101 - All Models
BOTTOM RETURN FILTER RACKS - S1- 1BR05xx series are
galvanized steel filter racks. 1BR06xx are pre-painted steel filter
racks to match the appearance of the furnace cabinet.
S1-1BR0517 or 1BR0617 - For 17-1/2” cabinets
S1-1BR0521 or 1BR0621 - For 21” cabinets
S1-1BR0524 or 1BR0624 - For 24-1/2” cabinets
COMBUSTIBLE FLOOR BASE KIT - For installation of these
furnaces in downflow applications directly onto combustible
flooring material, These kits are required to prevent potential
overheating situations. combustible floor base kit provides
clearance for combustible material.
S1-1CB0517 - For 17-1/2” cabinets
S1-1CB0521 - For 21” cabinets
S1-1CB0524 - For 24-1/2” cabinets
EAC TRANSITION KITS - For installation of EAC accessories
with these furnaces to provide easy transition of return airflow
through the EAC to get the proper sealing and reduced airflow
leakage.
S1-1TK1001 - For all models using side return
S1-1TK1017 - For 17-1/2” cabinets using bottom return
S1-1TK1021 - For 21” cabinets using bottom return
S1-1TK1024 - For 24-1/2” cabinets using bottom return
HIGH ALTITUDE PRESSURE SWITCHES - For installation
where the altitude is less than 5,000 feet it is not requi red that
the pressure switch be changed. For altitudes above 5,000 feet,
see kits below.